| On a diesel engine
working on the four-stroke operating cycle, what engine feature ensures
proper scavenging? |
Both the intake
and exhaust valves are closed during the transition from the exhaust stroke
to the intake stroke at top dead center. |
Both the intake
and exhaust valves are open during the transition from the exhaust stroke
to the intake stroke at top dead center. |
Both the intake
and exhaust valves are closed during the transition from the exhaust stroke
to the intake stroke at bottom dead center. |
Both the intake
and exhaust valves are open during the transition from the exhaust stroke
to the intake stroke at bottom dead center. |
| With respect to
lubricating oil's viscosity and the bearing loading characteristics at the
points of lubrication, what statement is true? |
The viscosity
should be low enough to withstand the greatest anticipated torque load and
low enough to minimize power losses. |
The viscosity
should be high enough to withstand the greatest anticipated torque load
and high enough to minimize power losses. |
The viscosity
should be high enough to withstand the greatest anticipated torque load,
but the viscosity should be low enough to minimize power losses. |
The viscosity
should be low enough to withstand the greatest anticipated torque load,
but the viscosity should be high enough to minimize power losses. |
| Which of the listed
conditions could result in the failure of an auxiliary diesel engine to
stop running when a normal shutdown is attempted? |
Supplying high
temperature inlet air. |
Maintaining a
high exhaust back pressure. |
Lube oil entering
in the air intake manifold. |
Carbon buildup
on the over speed pawl. |
| A diesel-generator
governor is hunting. After changing the oil, the governor is flushed and
the compensation needle valve is adjusted, but the hunting persists. You
should NOW __________. |
set the speed
droop adjustment to zero |
calibrate the
fuel pump rack settings |
carefully check
for binding in the governor linkage |
check air intake
manifold pressure |
| When analyzing
indicator card diagrams you are calculating the work output from the cylinder
by obtaining the area within the curve of what type of diagram? |
pressure/temperature |
pressure/volume |
pressure/enthalpy |
temperature/entropy |
| As an engineer
of a slow-speed diesel powered vessel, you note that the indicator card
diagrams have a flat horizontal profile around TDC. To rectify this, what
would be your best course of action? |
Use a spring with
a higher spring constant (k value) in the indicator. |
Reduce the RPM
at which the readings are taken. |
Use a spring with
a lower spring constant (k value) in the indicator. |
Increase the RPM
at which the readings are taken. |
| What is a major
initial ramification of receiving bunkers with a water content of 0.75%
by volume? |
Vessel will have
to use additional efforts to reduce the water content, the oily-water separators
can deal with the discharge waste water. |
Economic loss
of receiving less fuel, by volume, but still within ISO 8217:2010 fuel specifications. |
Loss of specific
heating value of fuel's thus effecting fuel consumption and engine efficiency,
as well as an economic loss. |
All water may
be dealt with by proper use of centrifuges, thus not a significant onboard
or economic/engineering problem. |
| You notice that
the fuel oil sludge tank level is increasing at a higher than normal daily
rate. The main engine fuel oil leakage tank has a normal level. What would
you consider your first action to be? |
Lower fuel oil
throughput through the fuel oil centrifuges. |
Increase the self-cleaning
cycle interval times of the fuel oil centrifuges. |
Determine if the
tank level rise is attributed to fuel or water. |
Change gravity
disk on the fuel oil purifying centrifuge(s). |
| When operating
the purifiers in "parallel", as shown in the illustration____________.
Illustration MO-0077 |
valve "2"
would be closed |
valve "3"
would be closed |
valve "6"
would be closed |
All of the above. |
| Which segment
of the two-stroke cycle engine diagram shown represents the power stroke?
Illustration MO-0037 |
I |
IV |
V |
VI |
| In a two-stroke
cycle diesel engine, a Roots-type blower is usually __________. |
gear driven by
the engine |
driven by an exhaust
gas turbine |
actuated by the
intake valves |
driven by separate
motor |
| Following the
failure of one turbocharger on a crosshead, propulsion diesel engine, fitted
with multiple turbochargers, which of the following actions should be taken
prior to further operation of the engine? |
Lock the rotor
of the damaged turbocharger. |
Secure cooling
and lubrication to the damaged turbocharger. |
Blank off the
exhaust gas inlet to the damaged turbocharger. |
All of the above. |
| What is a major
initial ramification of receiving bunkers with a water content of 0.75%
by volume? |
Vessel will have
to use additional efforts to reduce the water content, the oily-water separators
can deal with the discharge waste water. |
Economic loss
of receiving less fuel, by volume, but still within ISO 8217:2010 fuel specifications. |
Loss of specific
heating value of fuel's thus effecting fuel consumption and engine efficiency,
as well as an economic loss. |
All water may
be dealt with by proper use of centrifuges, thus not a significant onboard
or economic/engineering problem. |
| In the illustration,
the intake valve closes at what point on the four-stroke cycle engine diagram
shown? Illustration MO-0084 |
45 degrees after
BDC |
55 degrees before
BDC |
75 degrees before
TDC |
85 degrees after
TDC |
| Following the
failure of one turbocharger on a propulsion diesel engine, fitted with multiple
turbochargers, which of the following actions should be taken prior to further
operation of the engine? |
Lock the rotor
of the damaged turbocharger. |
Secure cooling
and lubrication to the damaged turbocharger. |
Blank off the
exhaust gas inlet to the damaged turbocharger. |
All of the above. |
| What is a major
initial ramification of receiving bunkers with a water content of 0.75%
by volume? |
Vessel will have
to use additional efforts to reduce the water content, the oily-water separators
can deal with the discharge waste water. |
Economic loss
of receiving less fuel, by volume, but still within ISO 8217:2010 fuel specifications. |
Loss of specific
heating value of fuel's thus effecting fuel consumption and engine efficiency,
as well as an economic loss. |
All water may
be dealt with by proper use of centrifuges, thus not a significant onboard
or economic/engineering problem. |
| Regularly taken
indicator cards on a diesel engine provides relative engine performance
data allowing engineers to compare to previous data and manufacturer's design.
What are the two most important parameters obtained from reading the indicator
cards? |
Pmax and Pcomp. |
Pmax and injection
delay. |
Pmax and scavenging
air pressure. |
Pcomp and injection
timing. |
| Starting a diesel
engine on diesel fuel during cold weather conditions will be made easier
by __________. |
increasing the
quantity of starting air |
increasing the
lube oil pressure |
heating the engine
fuel supply |
heating the engine
coolant |
| You are onboard
a vessel with a slow-speed crosshead type engine. The fuel just received
has significantly lower sulfur content than the previous bunkers. Which
of the following would be a concern due to the reduced sulfur content? |
Fuel injection
temperature |
Base number of
the cylinder oil |
Fuel supply system
pressure |
Purifier gravity
disk size |
| Many fuel oils
generally have an upper average ash content of 0.1% by weight. Which of
the following conditions could be expected if the ash content increases
above this amount? |
Increased exhaust
valve wear |
Increased MEP |
Excessive bearing
wear |
Glazing of the
cylinder liners |
| Most diesel engines
use a duplex lube oil strainer to __________. |
decrease the time
required between cleanings |
remove all large
and small foreign objects |
ensure a positive
flow of oil at all times |
ensure that all
lube oil has been treated twice |
| Starting systems
for large, direct reversing diesel engines are usually __________. |
hydraulic starting
motors |
electric starting
motors |
direct air admission |
vane type air
motors |
| Which segment
of the two-stroke cycle engine diagram shown in the illustration represents
the exhaust event? Illustration MO-0037 |
I |
II |
III |
IV |
| Regularly taken
indicator cards on a slow-speed diesel engine provides relative engine performance
data allowing engineers to compare to previous data and manufacturer's design.
What are the two most important parameters obtained from reading the indicator
cards? |
Pmax and Pcomp. |
Pmax and injection
delay. |
Pmax and scavenging
air pressure. |
Pcomp and injection
timing. |
| In a two-stroke
cycle diesel engine, a Roots-type blower is usually __________. |
gear driven by
the engine |
driven by an exhaust
gas turbine |
actuated by the
intake valves |
driven by separate
motor |
| Wire brushing
and scraping can be used to remove hard carbon deposits from exhaust system
surfaces. When cleaning exhaust systems associated with the diesel engines
on the supply boat to which you are assigned, what technique can effectively
be used in conjunction with mechanical cleaning to loosen and soften up
these hard carbon deposits? |
Treating with
carbon tetrachloride solvent. |
Baking off carbon
with heat lamps. |
Sand blasting
with diamond dust. |
Treating with
carbon penetrating solvent. |
| The fresh water
cooling system self-contained, internally-sensing thermostatic temperature
control valves fitted on the main engines of your towing vessel are configured
as shown in the illustration. If the valve sleeve (item #4) as controlled
by the thermostatic sensing element (item #7) is in the position as shown
in the drawing, what statement is true? MO-0079 |
As shown, the
actual engine fresh water outlet temperature must be at the temperature
set point of the valve, thus sending a portion of the water flow through
the fresh water cooler and the remainder in bypass of the cooler. |
As shown, it is
not possible to determine what the relationship is between the actual engine
fresh water outlet temperature and the temperature set point of the valve,
and as such it is not possible to determine the flow pattern. |
As shown, the
actual engine fresh water outlet temperature must be above the temperature
set point of the valve, thus sending 100% of the water flow through the
fresh water cooler. |
As shown, the
actual engine fresh water outlet temperature must be below the temperature
set point of the valve, thus diverting 100% of the water flow in bypass
of the fresh water cooler. |
| The oil of a speed
control governor on one of your OSV's main diesel engines is foaming excessively,
and internally governor parts are sticking due to corrosion. What is the
most likely cause? |
The oil is excessively
contaminated with water. |
The type of oil
used is incompatible with governor seals. |
The viscosity
grade of the oil is improper for existing temperature conditions. |
The oil is excessively
contaminated with solids. |
| In order to determine
the restriction across a dry-type air filter on one of the diesel engines
on your general purpose supply boat, the engine should be operating at rated
speed and load. What instrument would give the most accurate measurement
of air filter element restriction? |
A bourdon tube
vacuum gauge. |
A bourdon tube
compound gauge. |
A mercury manometer. |
A water manometer. |
| Which statement
most accurately represents the requirements for softening hard carbon deposits
associated with the burner atomizers of an auxiliary boiler as fitted on
your towing vessel? |
Carbon should
be softened by soaking in diesel fuel or kerosene. |
Carbon should
be softened by soaking in sulfamic or hydrochloric acid. |
Carbon should
be softened by blowing through with steam. |
Carbon should
be softened by soaking in hot soapy water. |
| You are assigned
to a towing vessel fitted with main propulsion diesel engines of the type
shown in the illustration. If the engine's crankshaft is turning at 900
rpm, what will be the rotational speed of the two camshafts? Illustration
MP-MS-04 |
450 rpm |
900 rpm |
1800 rpm |
Not enough information
is given to determine camshaft rpm. |
| Some main propulsion
diesel engine uses sea water to directly cool the __________. |
cylinder heads |
exhaust valves |
scavenging air |
injectors |
| The ship-docking
tug to which you are assigned has main diesel engines fitted with intake
and exhaust systems as shown in the illustration. Under what circumstances
would the check valve open and bypass the rotary-lobe roots blower? Illustration
MP-IX-10 |
The check valve
opens when the engine is running under a relatively heavy load and the rotary-lobe
roots blower discharge pressure is positive. |
The check valve
opens when the engine is running under a relatively light load and the rotary-
lobe roots blower discharge pressure is positive. |
The check valve
opens when the engine is running under a relatively heavy load and the rotary-lobe
roots blower discharge pressure is negative. |
The check valve
opens when the engine is running under a relatively light load and the rotary-
lobe roots blower discharge pressure is negative. |
| You are assigned
to a twin-screw towing vessel fitted with main propulsion diesel engines
operating on the cycle represented in the polar timing diagram shown in
the illustration. When do the intake valves open and close respectively?
Illustration MO-0084 |
The intake valves
open at bottom dead center at the end of the intake stroke. The intake valves
close at top dead center at the beginning of the intake stroke. |
The intake valves
open at 75o before top dead center on the exhaust stroke.The intake valves
close at 45o after bottom dead center on the compression stroke. |
The intake valves
open at top dead center at the beginning of the intake stroke. The intake
valves close at bottom dead center at the end of the intake stroke. |
The intake valves
open at 45o after bottom dead center on the compression stroke. The intake
valves close at 75o before top dead center on the exhaust. |
| You are attempting
to start a deck winch drive engine fitted with an electric cranking motor
where the battery electrolyte is frozen. What should be done to facilitate
starting? |
The engine should
be started by means of jumper cables connected to another battery without
any particular concern regarding the electrolyte being frozen. |
The battery electrolyte
should be allowed to thaw, and then the battery should be recharged as necessary
before attempting to start the engine. |
The battery electrolyte
should be allowed to thaw, and then the battery electrolyte should be diluted
with distilled water as necessary before attempting to start the engine. |
The battery electrolyte
should be thawed by means of a battery charger, and then the battery should
be recharged as necessary before attempting to start the engine. |
| A diesel generator
set on your offshore supply boat has a simplex lube oil strainer of the
type shown in the illustration, situated on the discharge side of the lube
oil pump. At a specified engine rpm and lube oil temperature, you notice
that the pressure drop becomes unacceptably high. When you rotate the cleaning
handle you notice that it is extremely difficult to rotate. What should
be done? Illustration MO-0057 |
After stopping
the engine, the drain plug (B) should be removed to drain the accumulated
sludge from the strainer sump. |
The cleaning handle
(A) should be forced to rotate, even if it requires an extender handle to
produce greater rotating torque. |
After stopping
the engine, the strainer element should be withdrawn and soaked in solvent
to break up the heavy deposits on the disk stack (C). |
No special consideration
need be taken as long as the cleaning handle (A) rotates, even if it rotates
with great difficulty. |
| The main propulsion
diesel engines on the tug to which you are assigned are fitted with mechanically
operated and controlled unit injectors. When are the sintered metal supply
and return injector filters typically replaced? |
Whenever the unit
injectors are removed for reconditioning. |
Whenever the fuel
system secondary filter elements are replaced. |
Whenever the fuel
system primary suction strainer is cleaned. |
Whenever the coalescing
fuel filters are drained of sludge and moisture. |
| In preparation
for getting a tug-barge unit underway, if enough time has elapsed since
the last main engine shutdown, it may be necessary to blow down the engine's
cylinders to expel any accumulated water or oil. What statement concerning
cylinder blow down is true? |
The engine is
rolled over with fuel delivery and with the cylinder test valves (indicator
cocks) closed. |
The engine is
rolled over with no fuel delivery and with the cylinder test valves (indicator
cocks) closed. |
The engine is
rolled over with fuel delivery and with the cylinder test valves (indicator
cocks) open. |
The engine is
rolled over with no fuel delivery and with the cylinder test valves (indicator
cocks) open. |
| The anchor handling
supply vessel to which you are assigned has diesel generators fitted with
fuel injectors with the operating principle as shown in the illustration.
In figure "B" which plunger rotation position corresponds to the
engine running under no load at idle RPM? Illustration MP-FI-12 |
1 |
2 |
3 |
4 |
| You are assigned
to a river push boat fitted with main propulsion diesel engines operating
on the cycle represented in the polar timing diagram shown in the illustration.
What combustion cycle event has a duration of 103o? Illustration MP-TH-15 |
Compression |
Exhaust |
Intake |
Power |
| The towing vessel
to which you are assigned is gear-driven with one main propulsion diesel
engine and a fixed-pitch propeller. While underway, the main engine becomes
disabled, requiring your vessel to be towed back into port. If pressurized
lubricating oil is not available to the reduction gear shaft bearings, what
must be done during the towing operation? |
The reduction
gear output shaft must be prevented from rotating by means of locking the
propeller shaft. |
The reduction
gear input shaft must be prevented from rotating by means of engaging the
engine turning gear at the flywheel. |
The reduction
gear input shaft must be prevented from rotating my means of engaging the
propulsion clutch. |
The reduction
gear input and output shafts must be prevented from rotating by means of
blocking the gear teeth. |
| You are on a river
towboat using main propulsion engines of the type shown in the illustration.
What statement represents the procedure for inspection of the lower cylinder
liner bore while in place inside the engine? Illustration MP-MS-04 |
With the particular
piston positioned at BDC and the corresponding oil pan hand hole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at TDC and the corresponding oil pan handhole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at BDC and the corresponding air box hand hole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at TDC and the corresponding air box hand hole cover removed,
inspect the lower liner bore through the crankcase opening. |
| The main engines
on your anchor handling supply boat utilize a starting system similar to
that shown in the illustration. The air supply pressure and engine room
ambient temperatures are both within the normal range. Upon attempted start-up,
the engine turns very slowly, and the flow rate of air from the air starting
motor exhaust is very low. Which of the listed conditions would most likely
be the cause of the failure to start? Illustration MP-SR-13 |
The air-starting
motor vanes are stuck in their slots. |
The in-line lubricator
siphon tube is severely restricted. |
The in-line strainer
basket element is severely restricted. |
The fuel injection
system piping is air-bound. |
| The turbochargers
on the main propulsion engines on the towing vessel to which you are assigned
are fitted with an exhaust inlet screen to protect the turbocharger turbine.
Upon inspection, pieces of broken piston rings or exhaust valves are found
in the foreign object trap box. Why is it essential that this debris be
removed prior to placing the engine back into operation? |
The debris may
eventually break into smaller pieces allowing turbine foreign object damage. |
The debris may
eventually cause the screen to become severely restricted. |
The debris will
eventually become difficult to remove from the trap box. |
The debris will
cause the turbine casing to become statically imbalanced. |
| You are analyzing
the data used for trend analysis for a two-stroke main propulsion diesel
engine on your river push boat. Although the engine has yet to experience
a safety shutdown on high crankcase pressure, over time the crankcase pressure
(which normally runs in a vacuum) has gradually become less negative. Which
of the following failures would most likely be responsible for this condition? |
Leaking crankcase
handhole cover. |
Burned cylinder
exhaust valve. |
Dribbling injector
needle valve. |
Worn piston compression
rings. |
| A main diesel
engine on your platform supply vessel has experienced a safety shutdown
due to excessive crankcase pressure. What is the appropriate response? |
Immediately open
the crankcase to make the necessary inspections to determine the cause of
the high crankcase pressure safety shutdown. |
Allow 2 hours
for the engine to cool before opening the crankcase, and determine and correct
the cause of the trip before attempting to restart the engine. |
Allow the engine
to cool off for two minutes, then restart and monitor the crankcase pressure
to verify the cause of the shutdown. |
Immediately restart
the engine, and monitor the crankcase pressure to verify the cause of the
shutdown. |
| The ship-docking
tug to which you are assigned is fitted with auxiliary diesel engines of
the type shown in the illustration. In terms of valve operating gear and
cylinder liner type, what statement is true? Illustration MP-HS-04 |
This is a pushrod
operated overhead valve engine with wet cylinder liners. |
This is an overhead
cam engine with wet cylinder liners. |
This is a pushrod
operated overhead valve engine with jacketed cylinder liners. |
This is an overhead
cam engine with jacketed cylinder liners. |
| Prior to starting
a diesel generator engine fitted on your river push boat, the crankcase
oil level must be checked. At what checked level would you be required to
add make-up oil? |
When the oil level
drops below the FULL mark on the dipstick. |
When the oil level
drops to between the ADD and FULL marks on the dipstick. |
When the oil level
drops below the ADD mark on the dipstick. |
When the oil level
drops to where it is no longer visible on the dipstick. |
| The offshore supply
vessel to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If propulsion control functions
perfectly from the engine room control station, but will not function at
all from any of the remote stations, which of the following system faults
best accounts for these symptoms? Illustration MP-IC-12 |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
The attendance
valve at the pneumatic remote control station has a blocked outlet port. |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
| When preparing
to change the oil of the speed control governor of one of the main propulsion
engines on your towboat, you should consult the governor instruction manual
to determine the proper viscosity of the oil to use. What is the primary
factor that will determine the recommended viscosity? |
The operating
oil temperature range of the governor. |
The speed range
(from idle to maximum governed speed) of the engine. |
The output power
of the governor as expressed in inch-pounds. |
The maximum rated
power output of the engine. |
| An auxiliary diesel
engine on your tug uses a starting system similar to the one shown in the
illustration. The hand pump is capable of charging the accumulator to the
pressure necessary to start the engine and the engine successfully starts.
While running, the engine driven pump is not capable of maintaining the
accumulator in a state of being fully charged. Which of the following is
most likely to be the cause? Illustration MP-SR-05 |
The hydro-starter
(C) pistons are worn. |
The engine driven
pump (H) drive belt is broken. |
The unloading
valve (I) is set for too high a pressure. |
The full-flow
filter (G) is bypassing the element. |
| You are about
to check the valve lash adjustment on #1 cylinder's intake and exhaust valves
of an auxiliary diesel engine fitted on the ship-docking tug to which you
are assigned. You want to adjust the valve lash on both valves without having
to reposition the crankshaft between adjustments. What should be the position
of #1 piston to insure both the intake and exhaust valves are both in a
position to facilitate valve adjustment? |
The crankshaft
should be barred in the direction of rotation with #1 piston at BDC having
just completed a power stroke. |
The crankshaft
should be barred in the direction of rotation with #1 piston at TDC having
just completed a compression stroke. |
The crankshaft
should be barred in the direction of rotation with #1 piston at BDC having
just completed an intake stroke. |
The crankshaft
should be barred in the direction of rotation with #1 piston at TDC having
just completed an exhaust stroke. |
| Your oil platform
supply vessel is fitted with a two-pass, fire-tube, oil-fired auxiliary
boiler. What is the most practical way of determining if the outside surface
of the boiler tubes are excessively scaled with hard scale deposits? |
Monitoring the
feed pump pressures. |
Monitoring the
circulating pump pressures. |
Measuring the
outside diameter of the tubes. |
Performing a visual
inspection. |
| The harbor tug
to which you are assigned has a main engine fuel system as shown in the
illustration. Besides preventing the attached fuel oil pump and the hand
priming fuel oil pump from discharging through the other, what other purpose
do the anti-flood check valves serve? Illustration MP-FO-06 |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shutdown and
when the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shutdown and
when the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located below the engine. |
| Your offshore
supply vessel is fitted with a coil-type, forced-circulation, water-tube,
oil-fired auxiliary boiler. What is the most practical way of determining
if the inside surface of the coil is excessively scaled with hard scale
deposits? |
Monitoring the
circulating pump pressures. |
Monitoring the
feed pump pressures. |
Performing a visual
inspection. |
Measuring the
coil inside diameter. |
| A 4-stroke, medium-speed,
eight cylinder, in-line diesel engine has a firing order of 1-5-2-6-8-4-7-3.
When performing routine valve maintenance, #1 cylinder is set at TDC in
firing position. Which exhaust valves can be checked for proper valve lash? |
1, 3, 2, 7 |
1, 3, 2, 8 |
1, 5, 2, 4 |
1, 5, 2, 6 |
| The cetane number
is the index used to measure a fuel oil's __________. |
antiknock characteristics |
ignition quality |
rate of vaporization |
viscosity |
| The multi-purpose
supply vessel to which you are assigned is fitted with main propulsion reduction
gears as shown in the illustration. What statement is true concerning this
type of reduction gear? Illustration MP-DS-16 |
This type of reduction
gear is used with a controllable pitch propeller and a non-reversing engine. |
This type of reduction
gear is used with a fixed pitch propeller and a non-reversing engine. |
This type of reduction
gear is used with a fixed pitch propeller and a reversing engine. |
This type of reduction
gear is used with a controllable pitch propeller and a reversing engine. |
| The various auxiliary
diesel engines fitted on your sea-going tug may employ a variety of different
starting systems. What type of starting system is shown in the illustration?
Illustration MP-SR-05 |
Electric power
operated system |
Gas engine power
operated system |
Hydraulic power
operated system |
Pneumatic power
operated system |
| The main propulsion
diesel engines used to power the ship-docking tug to which you are assigned
are started with vane-type air-starting motors designed to operate at 250
psig. The in-line lubricator should provide 3 drops of oil per cranking
minute, as long as the in-line lubricator oil viscosity is as specified.
If the start air pressure is within the normal range and the oil viscosity
is correct, but the oil injection rate is only 1 drop per minute, what should
be done? |
The oil in the
in-line lubricator should be replaced with oil of lower viscosity than specified. |
The starting air
pressure supplied to the air-starting motors should be increased. |
The in-line lubricator
oil injection metering needle valve should be further closed. |
The in-line lubricator
oil injection metering needle valve should be further opened. |
| You suspect that
a diesel generator set on your offshore supply boat has a misfiring cylinder
because the engine, although warm, is running roughly. The six-cylinder
engine is fitted with a high pressure distributor type pump with hydraulically
operated injector nozzles. When you slacken the high pressure fuel line
at #4 fuel injector nozzle, the engine runs even rougher than before. Upon
re- tightening the high pressure fuel line fitting, the engine reverts back
to the original roughness before the fitting was slackened. What does this
indicate? |
#4 cylinder is
misfiring. You have successfully located the misfiring cylinder. |
#4 cylinder is
misfiring. Either #1, #2, or #3 cylinder is also misfiring. |
#4 cylinder is
misfiring. Either #5 or #6 cylinder is also misfiring. |
#4 cylinder is
firing properly. Any one of the other cylinders must be misfiring. |
| A main propulsion
diesel engine on your anchor-handling supply boat has experienced a safety
shutdown on high crankcase pressure which was accompanied by an alarm. After
waiting 2 hours as recommended by the manufacturer, the crankcase is opened
up and suitable repairs are accomplished. After re-closing the crankcase,
the engine fails to start. Which of the following would account for this? |
The high crankcase
pressure detector protective device must have its switch lever replaced
first before the engine can be restarted. |
The high crankcase
pressure detector protective device must have its diaphragm replaced first
before the engine can be restarted. |
The high crankcase
pressure detector protective device's pressure chamber must be evacuated
with a vacuum pump first before the engine can be restarted. |
The high crankcase
pressure detector protective device must be reset first before the engine
can be restarted. |
| The main engines
on your tug boat utilize a starting system similar to that shown in the
illustration. When starting the engine, an excessive amount of oil mist
exits the air starter exhaust port. Which of the listed conditions would
account for this? Illustration MP-SR-13 |
The in-line lubricator
needle valve degree of opening is excessive. |
The in-line lubricator
siphon tube is excessively restricted. |
Excessive oil
within the engine's cylinders is being pumped. |
The in-line lubricator
needle valve degree of opening is insufficient. |
| You are assigned
to a salvage tug fitted with main propulsion diesel engines of the type
shown in the illustration. If the engine's crankshaft is turning at 720
rpm, what will be the rotational speed of the two camshafts? Illustration
MO-0005 |
360 rpm |
720 rpm |
1440 rpm |
Not enough information
is given to determine camshaft rpm. |
| A turbocharged,
two-stroke cycle main propulsion diesel engine on your OSV is emitting gray
to black smoke excessively from the stack. Upon comparing the measured air
box pressure against a reference engine which is producing a clear stack,
the measured air box pressure is determined to be too high. Which of the
following conditions would most likely be the cause for the relatively high
air box pressure? |
Scavenging air
intake ports are excessively restricted with carbon deposits. |
Airside aluminium
fins on after coolers are excessively restricted. |
Turbocharger over-running
clutch failure. |
Turbocharger blower
air intake filter is excessively restricted. |
| The main propulsion
engines onboard your river push boat use a lubricating oil filtration scheme
as shown in the illustration. What type of filtration system is illustrated?
Illustration MP-LO-14 |
Bypass filtration |
Sump filtration |
Shunt filtration |
Full-flow filtration |
| The winch drive
engine on the harbor tug to which you are assigned is fitted with a Roots-type
blower as shown in the illustration. What statement is true concerning this
blower? Illustration MP-CA-09 |
Rotor "1"
turns counter-clockwise, and rotor "2" turns clockwise. Area "3"
is the suction passage, and area "4" is the discharge passage. |
Rotor "1"
turns clockwise, and rotor "2" turns counter-clockwise. Area "3"
is the discharge passage, and area "4" is the suction passage. |
Rotor "1"
turns clockwise, and rotor "2" turns counter-clockwise. Area "3"
is the suction passage, and area "4" is the discharge passage. |
Rotor "1"
turns counter-clockwise, and rotor "2" turns clockwise. Area "3"
is the discharge passage, and area "4" is the suction passage. |
| A diesel generator
set on your ship-docking tug has a simplex lube oil strainer of the type
shown in the illustration, situated on the discharge side of the lube oil
pump. At a specified engine rpm and lube oil temperature, you notice that
the inlet pressure is increasing and the outlet pressure is decreasing,
resulting in an unacceptable pressure drop. What should be done? Illustration
MO-0057 |
While the engine
is running, the cleaning handle (A) should be rotated one-half turn to remove
the accumulated dirt from the disk stack (C). |
While the engine
is running, the cleaning handle (A) should be rotated one or more full turns
to remove the accumulated dirt from the disk stack (C). |
While the engine
is running, the drain plug (B) should be carefully loosened to drain the
sludge from the strainer sump. |
The drain plug
(B) is removed to drain the sludge from the strainer sump, but the engine
must be stopped to perform this operation. |
| When interpreting
the engine lube oil supply header pressures for the main engines on your
OSV, what statement is true assuming that the lube oil pump is engine-driven? |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to decrease. |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to increase. |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to decrease. |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to increase. |
| In accordance
with 46 CFR Subchapter J, which of the listed starting aids is acceptable
for use with the emergency diesel-generator? |
Injection of ether
into the air intake. |
Thermostatically
controlled electric water jacket heater. |
Thermostatically
controlled electric oil sump heater. |
Heating the starting
battery. |
| The tank-type
full-flow lubricating oil filter is situated on the discharge side of the
engine-driven lube oil pump on the main engines on your sea-going tug. Assuming
oil pressure readings are observed at constant engine rpm and lube oil temperature,
what is the indication of gradually clogging filter elements as long as
the bypass relief valve remains closed? |
The filter inlet
AND outlet pressures BOTH gradually rise. |
The filter inlet
pressure gradually rises, while the filter outlet pressure gradually drops. |
The filter inlet
pressure gradually drops, while the filter outlet pressure gradually rises. |
The filter inlet
AND outlet pressures BOTH gradually drop. |
| The thermal fluid
heating oil system on your articulated tug-barge unit is configured similarly
to that shown in the illustration. What system component performs expansion
and deaeration functions? Illustration MP-SP-23 |
1 |
2 |
4 |
5 |
| You suspect that
a diesel generator set on your OSV has a misfiring cylinder because the
engine, although warm, is running roughly. The six-cylinder engine is fitted
with a multi-plunger in-line high pressure fuel injection pump with hydraulically
operated injector nozzles. When you slacken the high pressure fuel line
fitting at #3 fuel injector nozzle, the engine continues to run roughly
as before with no real change. Upon re-tightening the high pressure fuel
line fitting, there is no real change, as the engine continues to run roughly
as before. What does this indicate? |
Either #4, #5
or #6 cylinder is misfiring. #1 and #2 cylinders are firing properly. |
# 3 cylinder is
misfiring. You have successfully located the misfiring cylinder. |
# 3 cylinder is
firing properly. One of the other cylinders must be misfiring. |
Either #1 or #2
cylinder is misiring. #4, #5, and #6 cylinders are firing properly. |
| The general purpose
supply boat to which you are assigned is equipped with airflex pneumatic
tire friction type propulsion clutches. If it is required to replace a clutch
friction shoe, what statement is true? |
All the clutch
friction shoes should be replaced as a complete set, only if it is determined
that more than half the shoes are determined to be excessively worn. |
When less than
half the clutch friction shoes are determined to be excessively worn, replace
half the clutch friction shoes installed in between the reused shoes. |
Replace only those
clutch friction shoes that are determined to be excessively worn. All shoes
that are determined not be be excessively worn may be reused regardless
of the number. |
All the clutch
friction shoes should be replaced as a complete set, even if only one clutch
friction shoe is determined to be excessively worn. |
| You are assigned
to a tractor tug with a drive system as shown in figure "A" of
the illustration. What type of propulsion drive system is illustrated? Illustration
MP-DS-09 |
Controllable pitch
propeller drive |
Schottel-azimuthing
drive (z-drive) |
Voith-Schneider
drive |
Conventional fixed-propeller
drive |
| A diesel generator
set on your salvage tug has a simplex lube oil strainer of the type shown
in the illustration, situated on the discharge side of the lube oil pump.
At a specified engine rpm and lube oil temperature, you notice that the
pressure drop becomes unacceptably high. When you rotate the cleaning handle
you notice that it is extremely difficult to rotate. What should be done?
Illustration MO-0057 |
The cleaning handle
(A) should be forced to rotate, even if it requires an extender handle to
produce greater rotating torque. |
No special consideration
need be taken as long as the cleaning handle (A) rotates, even if it rotates
with great difficulty. |
After stopping
the engine, the strainer element should be withdrawn and soaked in solvent
to break up the heavy deposits on the disk stack (C). |
After stopping
the engine, the drain plug (B) should be removed to drain the accumulated
sludge from the strainer sump. |
| The auxiliary
oil-fired water-tube steam boiler on your anchor-handling supply vessel
is equipped with a water column similar to that shown in the illustration.
If the gauge glass becomes disabled or there is uncertainty associated with
the gauge glass reading, the tri-cocks can be used to determine the boiler
water level. What statement best describes the challenge associated with
trying to differentiate between steam and water? Illustration MO-0093 |
On a tricock situated
below the water level, when opened some of the escaping water will flash
to steam. |
On a tricock situated
above the water level, when opened all of the escaping steam will condense
to water. |
On a tricock situated
above the water level, when opened some of the escaping steam will condense
to water. |
On a tricock situated
below the water level, when opened all of the escaping water will flash
to steam. |
| A "Blotter
test" is a test performed on the lube oil of a diesel engine which
can determine __________. |
the specific gravity
of the oil |
the flash point
of the oil |
a change in the
oils viscosity |
the TBN number
of the oil |
| The diesel generator
engines onboard your ship-docking tug use a lubricating oil filtration scheme
as shown in the illustration. What type of filtration system is illustrated?
Illustration MP-LO-05 |
Bypass filtration |
Shunt filtration |
Full-flow filtration |
Sump filtration |
| What maintenance
practice represents the best protection against moisture carryover to the
fuel injection system of the main engines on board your towing vessel? |
Closing the diesel
oil day tank vents, particularly when the relative humidity is high. |
Frequently replacing
fuel injection pump and injector nozzle inlet fuel filters. |
Periodically opening,
then reclosing, the drain valve on coalescing type diesel oil filters. |
Periodically opening,
then reclosing, the vent valve on coalescing type diesel oil filters. |
| You are analyzing
the data used for trend analysis for one of the main propulsion diesel engines
on the OSV to which you are assigned. The cylinder exhaust temperature of
one of the cylinders is significantly lower than the others. When analyzing
compression and firing pressure data, however, the numbers are within the
normal range for this particular cylinder. What condition would produce
these results? |
Excessive carbon
build-up on air inlet ports or valves of affected cylinder. |
Leaking exhaust
valve on affected cylinder. |
Leaking fuel injector
needle valve for affected cylinder. |
Excessive carbon
build-up on exhaust pyrometer probe of affected cylinder. |
| Due to environmental
and safety concerns, the towing winch drive diesel engine cooling water
system is treated with propylene glycol for protection against freezing.
According to the illustration, what would be the limit of protection if
40 pints of propylene glycol are used in treating a cooling water system
with a volumetric capacity of 10 gallons? Illustration MP-WC-04 |
10°F |
-6°F |
-30°F |
-53°F |
| The manufacturer
of the diesel generator set drive engines used aboard your ship-docking
tug recommends that no more than a 2 psig pressure drop across a fuel primary
metal-edge suction strainer be allowed before recommended servicing. Assuming
that the strainer inlet pressure is 4 psig, what would be the minimum allowable
outlet pressure before recommended servicing? |
2 psig |
2" Hg |
6 psig |
6" Hg |
| Which of the following
statements describes pertinent criteria for performing a surface blow for
the purposes of removing excess chemicals and/or salinity as indicated by
boiler water testing on an auxiliary steam boiler as fitted on your OSV? |
The surface blow
would be performed when the boiler is steaming AND the level would be maintained
above normal during the duration of the blow. |
The surface blow
would be performed when the boiler is steaming AND the level would be maintained
normal during the duration of the blow. |
The surface blow
would be performed when the boiler is secured AND the level would be maintained
above normal during the duration of the blow. |
The surface blow
would be performed when the boiler is secured AND the level would be maintained
normal during the duration of the blow. |
| The main engines
on your harbor tug are protected with a low crankcase oil level detector
protective device designed to provide an alarm when the main sump oil level
drops below a certain level. It is malfunctioning, and upon investigation
you determine from the technical manual that the oil level detector is a
sealed unit. What statement best represents the best strategy to remedy
this situation? |
The oil level
detector seals must be broken before adjustments can be made, as long as
new seals are established before placing the unit back into operation. |
The oil level
detector must be replaced with a new detector if it is found to be defective,
since field adjustments are not possible on this type of unit. |
The oil level
detector is adjusted just as if it was an unsealed unit, but the seals must
be re- established before placing the unit back into operation. |
The oil level
detector is adjusted just as if it was an unsealed unit, without regard
to any seals associated with the unit. |
| The ship-docking
tug to which you are assigned has a deck winch drive engine fitted with
fuel injectors with the operating principle as shown in the illustration.
In figure "A" which plunger travel position corresponds to when
fuel injection begins? Illustration MP-FI-12 |
1 |
2 |
3 |
4 |
| Your offshore
supply boat is fitted with cooling water systems serving the main propulsion
diesel engines as shown in the illustration. What heat exchanger or cooler
location would most likely be fitted with sacrificial zinc anodes which
must be periodically inspected and replaced when sufficiently deteriorated?
Illustration MP-CW-15 |
Lube oil cooler
water box. |
RW/FW heat exchanger
water box. |
Lube oil cooler
shell. |
RW/FW heat exchanger
shell. |
| The fresh water
cooling systems serving the main engines on your platform supply vessel
are configured as shown in the illustration. While the effected main engine
is in operation, what would be the impact of RW/FW heat exchanger and lube
oil cooler tube leaks respectively? Illustration MP-CW-15 |
A RW/FW heat exchanger
tube leak will result in engine fresh water coolant leaking into the raw
water and out to sea as evidenced by a drop in the fresh water expansion
tank level. A lube oil cooler tube leak will result in lubricating oil leaking
into the engine fresh water coolant as evidenced by a rise in the fresh
water expansion tank level and a drop in the engine lube oil sump level. |
A RW/FW heat exchanger
tube leak will result in engine fresh water coolant leaking into the raw
water and out to sea as evidenced by a drop in the fresh water expansion
tank level. A lube oil cooler tube leak will result in engine fresh water
coolant leaking into the engine lubricating oil as evidenced by a drop in
the fresh water expansion tank level and a rise in the engine lube oil sump
level. |
A RW/FW heat exchanger
tube leak will result in raw water leaking into the engine fresh water coolant
as evidenced by a rise in the fresh water expansion tank level. A lube oil
cooler tube leak will result in engine fresh water coolant leaking into
the engine lubricating oil as evidenced by a drop in the fresh water expansion
tank level and a rise in the engine lube oil sump level. |
A RW/FW heat exchanger
tube leak will result in raw water leaking into the engine fresh water coolant
as evidenced by a rise in the fresh water expansion tank level. A lube oil
cooler tube leak will result in lubricating oil leaking into the engine
fresh water coolant as evidenced by a rise in the fresh water expansion
tank level and a drop in the engine lube oil sump level. |
| The ship-docking
tug to which you are assigned has main engines fitted with injectors similar
to those shown in the illustration. What statement is true concerning the
operating principle of this type of injector? Illustration MP-FI-22 |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve opening forces. |
The fuel pressure
within the annulus is a needle valve closing force, the compression load
on the spring is a needle valve opening force. |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve closing forces. |
The fuel pressure
within the annulus is a needle valve opening force, the compression load
on the spring is a needle valve closing force. |
| You suspect that
a diesel generator set on your salvage tug has a defective unit injector
because the engine, although warm, is running roughly. The two-stroke engine
is fitted with mechanically operated unit injectors. When you push and hold
down the No. 3 cylinder injector follower, there is no real change, as the
engine continues to run roughly as before. What does this indicate? |
The No. 3 cylinder
unit injector is faulty. You have successfully isolated the faulty unit
injector. |
The No. 3 cylinder
unit injector is functioning properly. One of the other cylinder unit injectors
must be faulty. |
Either the No.
1 or No. 2 cylinder unit injector is faulty. The No. 4, No. 5 and No. 6
cylinder unit injectors are functioning properly. |
Either the No.
4, No. 5, or No. 6 cylinder unit injector is faulty. The No. 1 and No. 2
cylinder unit injectors are functioning properly. |
| A generator drive
diesel engine on your general-purpose supply vessel has a misfiring cylinder.
After further investigation it has been determined that the injector nozzle
for the effected cylinder is faulty. After replacing the injector nozzle
with a reconditioned or new one, the injector must be bled of air. Assuming
the fuel injection pump is of the in-line multi-plunger type, how is this
done? |
The engine is
cranked over with the starter, and the high pressure fuel line fitting at
the delivery valve is loosened with the fuel control rack in the no fuel
position. |
The engine is
cranked over with the starter and the high pressure fuel line fitting at
the injector nozzle is loosened with the fuel control rack in the full fuel
position. |
The engine is
cranked over with the starter, and the high pressure fuel line fitting at
the injector nozzle is loosened with the fuel control rack in the no fuel
position. |
The engine is
cranked over with the starter, and the high pressure fuel line fitting at
the delivery valve is loosened with the fuel control rack in the full fuel
position. |
| The generator
drive diesel engines on your river push boat are fitted with a multi-plunger
injection pump with high pressure fuel lines leading to each hydraulically
operated injector. If the engine is allowed to run out of fuel, it may become
necessary to purge the high pressure fuel lines of air. How is this accomplished? |
Slackening each
high pressure fuel line fitting at the fuel injector while cranking over
the engine with the starter and allowing air to escape, then retightening
when a solid stream of fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while cranking over
the engine with the starter and allowing air to escape, then retightening
when air bubbly fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while stroking the
manually operated priming pump and allowing air to escape, then retightening
when a solid stream of fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while stroking the
manually operated priming pump and allowing air to escape, then retightening
when bubbly fuel is observed. |
| The main engines
on the harbor tug to which you are assigned are fitted with duplex secondary
spin- on fuel filters. Concerning the selector handle, what statement is
true? |
The selector handle
is normally placed in the "BOTH" position regardless of the load
or rpm on the engine in order to be able to double the fuel handling throughput
at any load or rpm and allow the engine speed to be changed without worrying
about the selector handle position. |
The selector handle
is placed in the "BOTH" position when the engine is running at
low load or rpm. When the engine is running at high load or rpm, the selector
handle is placed in either the "1" or "2" position depending
upon which filter element is clean. |
The selector handle
is placed in the "BOTH" position when the engine is running at
high load or rpm to accommodate higher fuel delivery requirements. When
the engine is running at low load or rpm, the selector handle is placed
in either the "1" or "2" position. |
The selector handle
is placed in either position the "1" or "2" position
regardless of the load or rpm on the engine. The selector handle is temporarily
placed in the "BOTH" position only when transitioning from a restricted
filter element over to a clean filter element. |
| Assuming the use
of ultra low sulfur content diesel fuel, what combination of arrangements
associated with offshore supply vessel main engine configurations would
result in the most accelerated corrosion of the inside wall of an exhaust
manifold of a main propulsion diesel engine? |
Where the main
engine operates on the four-stroke cycle and the exhaust manifold is uncooled. |
Where the main
engine operates on the four-stroke cycle and the exhaust manifold is water-
jacketed. |
Where the main
engine operates on the two-stroke cycle and the exhaust manifold is uncooled. |
Where the main
engine operates on the two-stroke cycle and the exhaust manifold is water-
jacketed. |
| The rated speed
of the main propulsion diesel engines on your towing vessel is 900 rpm.
The installed centrifugal over speed trip device similar to the one shown
in the illustration is designed to shutdown the engine at 110% of rated
speed. Upon testing the over speed trip device, you determine that the actual
shutdown occurs at 945 rpm. Which of the following would account for this?
Illustration MP-SF-06 |
The throw-out
weight (item 10) link bolt (item 15 and 16) is binding within the spring
guide (item 14) drilling. |
The throw-out
weight (item 10) pivot bolt (not labeled) is binding within the counterweight
(item 1 through 9) drilling. |
The compression
spring (item 12) was excessively compressed when the over speed trip was
last set. |
The jam nut was
not properly tightened against the adjusting nut (items 13) when the over
speed trip was last set. |
| You suspect that
a diesel generator set on your ocean-going tug has a faulty unit injector
because the engine, although warm, is running roughly. The two-stroke six-cylinder
engine is fitted with mechanically operated unit injectors. When you push
and hold down the injector follower of the No. 4 unit injector, the engine
runs even rougher than before. What does this indicate? |
The No. 4 cylinder
unit injector is faulty. You have successfully isolated the faulty cylinder
unit injector. |
The No. 4 cylinder
unit injector is faulty. Either No. 1, No. 2, or No. 3 cylinder unit injector
is also faulty. |
The No. 4 cylinder
unit injector is faulty. Either No. 5 or No. 6 cylinder unit injector is
also faulty. |
The No. 4 cylinder
unit injector is functioning properly. Any one of the other unit injectors
must be faulty. |
| An air box fire
on a turbocharged, two-stroke cycle main propulsion engine as fitted on
your general purpose supply vessel can cause the destruction of a turbocharger
due to overheat and overspeed. Upon inspection, besides blistering of paint
on handhole covers, what is distinctive evidence that an air box fire had
occurred? |
The complete absence
of any residue or accumulations. |
The presence of
white ash residue within the air box. |
The presence of
heavy oil accumulations within the air box. |
The presence of
heavy soot accumulations within the air box. |
| The diesel generator
set engines on the towing vessel to which you are assigned are fitted with
coalescing fuel filters, each fitted with a glass bowl. Assuming that the
processed fuel is contaminated with solid impurities and entrained water,
what would be the appearance of the bowl with the engine shutdown and no
fuel flowing? |
The solids would
settle at the very bottom of the bowl, with a layer of clean fuel above
that. Above the clean fuel layer would be a layer of water up to the top
of the bowl. |
The solids would
settle at the very bottom of the bowl, with a layer of water above that.
Above the water layer would be a layer of clean fuel up to the top of the
bowl. |
The solids would
float to the very top of the bowl, with a layer of water below that. Below
the water layer would be a layer of clean fuel down to the bottom of the
bowl. |
The solids would
float to the very top of the bowl, with a layer of clean fuel below that.
Below the clean fuel layer would be a layer of water down to the bottom
of the bowl. |
| The river push
boat to which you are assigned has diesel generators fitted with fuel injectors
of the type shown in figure "2" of the illustration. What statement
is true concerning this type of injector? Illustration MP-FI-20 |
The injector is
of the closed type and features pressure-time metering. |
The injector is
of the closed type and features port and helix metering. |
The injector is
of the open type and features pressure-time metering. |
The injector is
of the open type and features port and helix metering. |
| The turbocharged,
four-stroke, main propulsion diesel engines on your towing vessel are protected
with dry-type air intake filters. The engines are fitted with dial-type
restriction indicators measuring the pressure in the air duct between the
air intake filter and the turbocharger blower inlet. Under what conditions
should the air intake filters be evaluated using the restriction indicators? |
The engine should
be running at idle RPM with minimal load (propulsion clutch engaged). |
The engine should
be running at rated RPM with no load (propulsion clutch disengaged). |
The engine should
be running at rated RPM with full load (propulsion clutch engaged). |
The engine should
be running at idle RPM with no load (propulsion clutch disengaged). |
| What physical
property of low sulfur distillate fuel can result in operational difficulties? |
Lower heat content
results in higher fuel consumption. |
Lack of lubricity
in the fuel can result in sticking/scuffing of fuel pump plungers and injector
nozzles. |
Higher zinc content
precipitates out sludge. |
Increased viscosity
requires additional heating. |
| In preparation
for getting an offshore anchor handling vessel underway, what is the primary
factor to consider in determining when it is prudent to increase the main
propulsion engine rpm above idle and place a load on the engine? (Assume
that there are no starting aids.) |
The engine crankcase
lubricating oil temperature. |
The cylinder jacket
cooling water temperature. |
The cylinder jacket
cooling water expansion tank level. |
The cylinder jacket
cooling water pump pressure. |
| Various diesel
engines onboard your salvage tug are started by means of either vane-type
or air- turbine air-starting motors. At a minimum, in the absence of automatic
drain valves, how often should moisture separators be drained of moisture
while the vessel is underway? |
Hourly |
Daily |
Weekly |
Monthly |
| Assuming the use
of low sulfur content diesel fuel, what combination of conditions associated
with tugboat engine room operations would most contribute to internal corrosion
of exhaust systems? |
High ambient temperature
and high engine load. |
Low ambient temperature
and high engine load. |
High ambient temperature
and low engine load. |
Low ambient temperature
and low engine load. |
| The harbor tug
to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. All propulsion controls function
properly from all locations with the exception of the pneumatic remote control
station. Here the propulsion engine will run only at idle and neither propulsion
clutch will engage regardless of the throttle lever control position. Which
of the following system faults best accounts for these symptoms? Illustration
MP-IC-12 |
The throttle lever
control at the pneumatic remote control station has a blocked speed signal
pilot air port. |
The attendance
valve at the pilot house pneumatic master control station has a blocked
outlet port. |
The pilot house/remote
transfer valve at the pilot house pneumatic master control station has a
blocked remote port. |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
| A diesel engine
on your salvage tug has a restricted exhaust silencer/muffler resulting
in high exhaust back pressure. With an appreciable load on the engine, what
would be the condition of the exhaust gases exiting the stack? |
White smoke |
Gray to black
smoke |
Bluish tinge smoke |
Clear with no
smoke |
| Both crosshead
type and trunk type lubricating oil are received onboard a vessel. These
two oils cannot be interchanged due to which of the following reasons? |
Crosshead type
lubricating oil has a lower pour point |
Crosshead type
lubricating oil has a lower base number as it does not need to neutralize
the combustion by-products |
Trunk type lubricating
oil has a higher flash point |
Crosshead type
engine oil scraper rings are designed for a certain oil type |
| The fresh water
cooling systems of the main engines on your towing vessel are configured
as shown in the illustration. During normal engine operation which of the
listed fresh water temperature locations would indicate the highest temperature?
MP-CW-15 |
Fresh water inlet
to the RW/FW heat exchanger |
Fresh water outlet
from the lube oil cooler |
Fresh water outlet
from the RW/FW heat exchanger |
Fresh water inlet
to the lube oil cooler |
| The lubricating
oil system supporting the main propulsion reduction gear on your offshore
supply vessel is fitted with a lube oil strainer as shown in the illustration.
How often should the handle "A" be rotated for cleaning purposes?
Illustration MO-0057 |
Once per watch
while underway. |
Once per month. |
Once every six
months. |
Once per year. |
| You are on a slow-speed
diesel engine vessel equipped with an ALCAP fuel oil purification system.
You notice an increase in the water drained from the service tank bottom
drain. One of the first items to check on your system would be which of
the following? |
The closing water
solenoid valve in the fresh water line. |
The water transducer
located in the dirty oil supply line. |
The bowl RPM. |
The water transducer
located in the clean oil discharge line. |
| The auxiliary
engines on the offshore supply vessel to which you are assigned are fitted
with Roots- blowers as shown in the illustration. What statement is true
concerning the timing gears as shown in figure "A"? Illustration
MP-CA-12 |
The timing gears
are straight cut and insure that the blower is properly timed to the engine's
crankshaft. |
The timing gears
are helically cut and insure that the blower rotor lobes are properly spaced
apart with a close tolerance. |
The timing gears
are helically cut and insure that the blower is properly timed to the engine's
crankshaft. |
The timing gears
are straight cut and insure that the blower rotor lobes are properly spaced
apart with a close tolerance. |
| The fresh water
cooling systems serving the main engines on your sea-going tug are configured
as shown in the illustration. While the effected main engine is in operation,
what would be the impact of RW/FW heat exchanger and lube oil cooler tube
leaks respectively? MP-CW-15 |
A RW/FW heat exchanger
tube leak will result in engine fresh water coolant leaking into the raw
water and out to sea as evidenced by a drop in the fresh water expansion
tank level. A lube oil cooler tube leak will result in engine fresh water
coolant leaking into the engine lubricating oil as evidenced by a drop in
the fresh water expansion tank level and a rise in the engine lube oil sump
level. |
A RW/FW heat exchanger
tube leak will result in raw water leaking into the engine fresh water coolant
as evidenced by a rise in the fresh water expansion tank level. A lube oil
cooler tube leak will result in lubricating oil leaking into the engine
fresh water coolant as evidenced by a rise in the fresh water expansion
tank level and a drop in the engine lube oil sump level. |
A RW/FW heat exchanger
tube leak will result in raw water leaking into the engine fresh water coolant
as evidenced by a rise in the fresh water expansion tank level. A lube oil
cooler tube leak will result in engine fresh water coolant leaking into
the engine lubricating oil as evidenced by a drop in the fresh water expansion
tank level and a rise in the engine lube oil sump level. |
A RW/FW heat exchanger
tube leak will result in engine fresh water coolant leaking into the raw
water and out to sea as evidenced by a drop in the fresh water expansion
tank level. A lube oil cooler tube leak will result in lubricating oil leaking
into the engine fresh water coolant as evidenced by a rise in the fresh
water expansion tank level and a drop in the engine lube oil sump level. |
| For an OSV operating
within U.S. territorial waters, what type of fuel is generally used on auxiliary
and main propulsion high speed diesel engines? |
Residual fuel
oil |
Distillate fuel
oil |
Heavy fuel oil |
Blended fuel oil |
| In accordance
with 46 CFR Subchapter F, diesel fuel oil system valves for removing water
or impurities are __________. |
permitted, provided
they are fitted with caps or plugs |
required, if there
are no separators installed on board |
not required,
provided there is a high and low tank suction |
strictly prohibited |
| The diesel generators
on the river pushboat to which you are assigned are fitted with a charge
air system as shown in the illustration. What statement is true concerning
this type of charge air system? Illustration MP-CA-10 |
The scavenging
blower is a positive displacement type, and the actual displacement is directly
proportional to engine speed. |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is not directly proportional to engine speed. |
The scavenging
blower is a positive displacement type, and the actual displacement is not
directly proportional to engine speed. |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is directly proportional to engine speed. |
| When checking
the valve stem to rocker arm clearances on an auxiliary diesel engine onboard
your harbor tug, which of the following statements concerning intake and
exhaust clearances when taken cold is correct? |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be equal to
the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be less than
the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance could be less than or greater
than the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be greater
than the intake valve clearance. |
| In a closed, re-circulating
fresh water cooling system used for the main engines on your oil platform
supply vessel, what function would chemical treatment with molybdate primarily
perform? |
Boiling point
elevation. |
Biological growth
inhibition. |
Freezing point
depression. |
Corrosion inhibition. |
| In terms of the
diesel fuels burned in auxiliary and main propulsion diesel engines used
on board towing vessels, which of the listed fuel properties would be most
critical to consider when transferring and forwarding fuel in extremely
low ambient temperature conditions? |
Ash content |
Flash point |
Heating value |
Pour point |
| The two-stroke
cycle main propulsion engines on the river pushboat to which you are assigned
are fitted with Roots-type blowers for scavenging purposes. Upon inspection
of the air boxes, what condition would indicate a need to replace the Roots-type
blower immediately? |
Iron dust residue |
Aluminum dust
residue |
Oil accumulations |
Water accumulations |
| When entering
a ECA, when should you begin the changeover to low sulphur fuel on a slow-speed
diesel vessel? |
At Arrival. |
An hour before
crossing the demarcation line for low sulphur fuel. |
In sufficient
time to ensure the engine is burning a fuel mixture of sufficiently low
sulphur to meet the regulatory requirement. |
When the vessel
crosses the demarcation line. |
| A main propulsion
diesel engine on your offshore supply boat produces white smoke under all
load conditions. What condition would most likely account for this? |
Leaking exhaust
piping expansion joints. |
Excessively restricted
exhaust silencer/muffler. |
Excessively worn
exhaust valve guides. |
Leaking exhaust
manifold cooling water jackets. |
| A Roots-blown,
two-stroke cycle main propulsion engine on the ship-docking tug to which
you are assigned is emitting excessive bluish-tinged smoke from the stack.
Further investigation reveals excessive lube oil consumption. What condition
would most likely account for this? |
Restricted blower
air intake filter. |
Worn blower rotor
shaft seals. |
Restricted scavenging
air intake ports. |
Leaking fuel injector
needle valve. |
| The ship-docking
tug to which you are assigned has diesel generators fitted with unit injectors
with the operating principle as shown in the illustration. What statement
is true concerning the beginning and ending of injection? Illustration MP-FI-12 |
Injection begins
when the lower fuel port is covered by the lower helix of the upward moving
plunger, and injection ends when the upper fuel port is uncovered by the
upper helix of the upward moving plunger. |
Injection begins
when the lower fuel port is covered by the lower helix of the downward moving
plunger, and injection ends when the upper fuel port is uncovered by the
upper helix of the downward moving plunger. |
Injection begins
when the upper fuel port is covered by the upper helix of the downward moving
plunger, and injection ends when the lower fuel port is uncovered by the
lower helix of the downward moving plunger. |
Injection begins
when the upper fuel port is covered by the upper helix of the upward moving
plunger, and injection ends when the lower fuel port is uncovered by the
lower helix of the upward moving plunger. |
| An engine that
runs rough or expels large amounts of black smoke may indicate a misfiring
cylinder. Assume that the auxiliary diesel engines on your river push boat
have a fuel injection system that permits the injectors to be disabled for
troubleshooting purposes by loosening the high pressure fuel injection line
fitting at the injector nozzle while the engine is running and noting the
engine response. If before the injector is disabled the engine is running
rough and expelling large amounts of black smoke and after the injector
is disabled, the engine continues to run equally rough, but the engine now
produces a clear stack, what is indicated? |
This indicates
that the cylinder associated with the disabled injector is misfiring, but
all other injectors are firing properly. |
This indicates
that the cylinder associated with the disabled injector is firing properly,
but at least one other injector is misfiring. |
This indicates
that the cylinder associated with the disabled injector is misfiring, and
at least one other injector is misfiring. |
This indicates
that the cylinder associated with the disabled injector is firing properly,
and all other injectors are firing properly. |
| The manufacturer
of the diesel generator set drive engines used aboard your anchor-handling
supply vessel recommends that no more than a 2 psig pressure drop across
a fuel primary metal- edge suction strainer be allowed before recommended
servicing. Assuming that the strainer inlet pressure is 4 psig, what would
be the minimum allowable outlet pressure before recommended servicing? |
2" Hg |
2 psig |
6 psig |
6" Hg |
| You are assigned
to a tractor tug with a drive system as shown in figure "B" of
the illustration. What type of propulsion drive system is illustrated? Illustration
MP-DS-09 |
Conventional fixed-propeller
drive |
Schottel-azimuthing
drive (z-drive) |
Controllable pitch
propeller drive |
Voith-Schneider
drive |
| The lubricating
oil system supporting the main propulsion reduction gear on the harbor tug
to which you are assigned is fitted with a lube oil strainer as shown in
the illustration. Which of the following maintenance actions is performed
most often in terms of frequency? Illustration MO-0057 |
Rotating the cleaning
handle "A". |
Draining of the
sump by removal of drain plug "B". |
Removal of straining
element "C" and cleaning/soaking in kerosene. |
Removal of sump "D"
to facilitate visual inspection of straining element. |
| The rated speed
of the main propulsion diesel engines on your offshore supply vessel is
900 rpm. The installed centrifugal overspeed trip device similar to the
one shown in the illustration is designed to shutdown the engine at 110%
of rated speed. Upon testing the overspeed trip device, you determine that
the actual shutdown occurs at 945 rpm. Which of the following would account
for this? Illustration MO-0101 |
The throw-out
weight (item #10) pivot bolt (not labelled) is binding within the counterweight
(item 1 through 9) drilling. |
The throw-out
weight (item #10) link bolt (item #15 & #16) is binding within the spring
guide (item #11) drilling. |
The compression
spring (item #12) was excessively compressed when the overspeed trip was
last set. |
The jam nut (item
#14) was not properly tightened against the adjusting nut (items #13) when
the overspeed trip was last set. |
| A main propulsion
reversing reduction gear unit on your river pushboat is fitted with wet-type
duplex multiple-plate type clutches. When in the neutral position, the output
shaft continues to turn. Which of the following listed conditions would
most likely be responsible for this? |
Excessively leaking
shaft seals |
Excessively warped
clutch discs |
Excessively high
clutch oil pressure |
Excessively high
reduction gear reservoir oil level |
| The four-stroke
cycle, turbocharged main propulsion engines on your anchor-handling supply
vessel are fitted with after coolers for the purposes of increasing the
air charge density and total power output. The after cooler air ducts must
be periodically drained to remove accumulated condensation. What combination
of conditions dictate more frequent draining? |
High ambient temperature
and high engine load. |
Low ambient temperature
and high engine load. |
High ambient temperature
and low engine load. |
Low ambient temperature
and low engine load. |
| The main propulsion
engines onboard your river push boat use a lubricating oil filtration scheme
as shown in the illustration. What type of filtration system is illustrated?
Illustration MP-LO-09 |
Full-flow filtration |
Sump filtration |
Bypass filtration |
Shunt filtration |
| A main propulsion
diesel engine on your anchor-handling supply vessel produces gray to black
smoke under virtually all load conditions as observed at the stack. The
heavier the load on the engine, the darker the smoke becomes. What condition
would most likely account for this? |
Leaking exhaust
piping expansion joints. |
Excessively worn
exhaust valve guides. |
Excessively restricted
exhaust silencer/muffler. |
Leaking exhaust
manifold cooling water jackets. |
| In accordance
with 46 CFR Subchapter J, which of the listed starting aids is acceptable
for use with the emergency diesel-generator? |
Injection of ether
into the air intake. |
Thermostatically
controlled electric water jacket heater. |
Thermostatically
controlled electric oil sump heater. |
Heating the starting
battery. |
| The oil of a speed
control governor on one of your tug's main diesel engines is foaming excessively,
and internally governor parts are sticking due to corrosion. What is the
most likely cause? |
The oil is excessively
contaminated with water. |
The type of oil
used is incompatible with governor seals. |
The viscosity
grade of the oil is improper for existing temperature conditions. |
The oil is excessively
contaminated with solids. |
| The salvage tug
to which you are assigned has a pneumatic propulsion control system as shown
in the illustration. When the mechanical slave remote control station is
being used to control propulsion, what is the direct result of positioning
the control lever in the ahead direction? Illustration MP-IC-12 |
Movement of the
mechanical slave remote control station lever directly shifts the engine
room control station lever control valve spool by the action of a chain
or cable which results in pneumatic shifting of the clutch actuator 4-way
control valve to the ahead direction. |
Movement of the
mechanical slave remote control station lever directly shifts the pneumatic
remote control station lever control valve spool by the action of a chain
or cable which results in pneumatic shifting of the clutch actuator 4-way
control valve to the ahead direction. |
Movement of the
mechanical slave remote control station lever directly shifts the pilot
house pneumatic master control station lever control valve spool by the
action of a chain or cable which results in pneumatic shifting of the clutch
actuator 4-way control valve to the ahead direction. |
Movement of the
mechanical slave remote control station lever directly shifts the clutch
actuator 4-way control valve to the ahead direction by the action of a chain
or cable. |
| A main propulsion
diesel engine on your ship docking tug has experienced a safety shutdown
due to high lubricating oil temperature. What is the appropriate response? |
Allow 2 hours
for the engine to cool down before attempting to inspect the engine and
correct the cause of the trip before attempting to restart the engine. |
Immediately perform
the engine inspections to determine the cause of the high oil temperature
safety shutdown. |
Immediately restart
the engine, and monitor the oil temperature to verify the cause of the shutdown. |
Allow the engine
to cool off for two minutes, then restart and monitor the lubricating oil
temperature to verify the cause of the shutdown. |
| The pneumatic
propulsion control system used on your integrated tug-barge unit uses a
diaphragm- operated relay valve as shown in the illustration. Periodically,
the valve is to be disassembled for cleaning and inspection. What statement
best describes the proper method for lubrication upon reassembly? Illustration
MO-0052 |
O-rings should
be lubricated with a silicone-based grease. |
O-rings should
be lubricated with penetrating oil. |
O-rings should
be lubricated with dessicant powder. |
O-rings should
not be lubricated by any means. |
| You are assigned
to an offshore supply vessel fitted with main propulsion diesel engines
of the type shown in the illustration. If the engine's crankshaft is turning
at 720 rpm, what will be the rotational speed of the two camshafts? Illustration
MO-0005 |
360 rpm |
720 rpm |
1440 rpm |
Not enough information
is given to determine camshaft rpm. |
| In a closed, re-circulating
fresh water cooling system used for the diesel generators on your coastwise
towing vessel, what function would chemical treatment with organic phosphates
primarily perform? |
Corrosion inhibition. |
Biological growth
inhibition. |
Scale control
and suppression. |
Freezing point
depression. |
| The main propulsion
diesel engines fitted on your anchor handling vessel are equipped with engine
crankcase oil level dipsticks marked on both sides of the dipstick. What
is the significance of the markings? |
The add and full
marks on both sides correspond to one another and are identically placed.
Either side can be used accurately no matter what is the running status
of the engine and what is the temperature of the oil. |
The add and full
marks on one side correspond to the side to be used when the engine is running
at IDLE RPM and the engine oil is COLD. On the other side, the marks correspond
to side to be used when the engine is running at MAXIMUM RPM and the engine
oil is HOT. |
The add and full
marks on one side correspond to the side to be used when the engine is STOPPED
and the engine oil is HOT. On the other side, the marks correspond to side
to be used when the engine is running at IDLE RPM and the engine oil is
COLD. |
The add and full
marks on one side correspond to the side to be used when the engine is STOPPED
and the engine oil is COLD. On the other side, the marks correspond to side
to be used when the engine is running at IDLE RPM and the engine oil is
HOT. |
| The towing vessel
to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If propulsion control functions
perfectly from the engine room control station, but will not function at
all from any of the remote stations, which of the following system faults
best accounts for these symptoms? Illustration MP-IC-12 |
The attendance
valve at the pneumatic remote control station has a blocked outlet port. |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
| The fire pump
drive engine on the salvage tug to which you are assigned is fitted with
a turbocharger as shown in the illustration. What statement is true concerning
this type of turbocharger? Illustration MP-CA-06 |
The turbocharger
is fitted with a radial flow turbine and inboard shaft bearings. |
The turbocharger
is fitted with an axial flow turbine and outboard shaft bearings. |
The turbocharger
is fitted with an axial flow turbine and inboard shaft bearings. |
The turbocharger
is fitted with a radial flow turbine and outboard shaft bearings. |
| The main engines
on your ocean-going salvage tug are fitted with speed control governors
of the type shown in the illustration. If the shutdown solenoid is de-energized
during normal operation, which of the following scenarios depicts the response
on a safety shutdown where the shutdown plunger rod moves downward unseating
the ball check valve when the shutdown solenoid energizes? Illustration
MP-IC-14 |
The servo piston
rod moves downward. The power cylinder tailrod moves downward. |
The servo piston
rod moves upward. The power cylinder tailrod moves upward. |
The servo piston
rod moves upward. The power cylinder tailrod moves downward. |
The servo piston
rod moves downward. The power cylinder tailrod moves upward. |
| In terms of the
diesel fuels burned in auxiliary and main propulsion diesel engines on general
purpose offshore supply vessels, which of the listed fuel properties would
be most critical to consider when transferring and forwarding fuel in extremely
low ambient temperature conditions? |
Ash content |
Pour point |
Flash point |
Heating value |
| The main propulsion
diesel engines on your salvage tug are protected with a high coolant temperature
switch used as an alarm contact maker to warn operating personnel of the
potential danger of an overheated engine. If the switch is fitted with a
test button, what is this used for? |
The test button
is used to reset the switch to clear an actual alarm condition. |
The test button
is used to determine the actual alarm point temperature. |
The test button
is used to test the alarm circuit whenever it is deemed necessary to do
so. |
The test button
is used every time the engine is started to test the alarm circuit prior
to start- up. |
| The pneumatic
propulsion control system used on your ship-docking tug uses a diaphragm-operated
relay valve as shown in the illustration. Periodically, the valve is to
be disassembled for cleaning and inspection. What statement best describes
the proper method for servicing the in-line strainers? Illustration MO-0052 |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with high pressure compressed air. |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with low pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with low pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with high pressure compressed air. |
| An oil bath type
air cleaner, as the name implies, requires oil for effective air filtration.
What statement is true concerning the oil bath air cleaners used to protect
the auxiliary diesel engines on your OSV? |
The wire-mesh
filter element should be dipped in oil prior to installation. Other than
that, the oil bath air cleaner is kept dry. |
An oil bath air
cleaner should have an oil level maintained so that the oil level is just
below the oil drain hole of the oil reservoir. |
An oil bath air
cleaner should have an oil level maintained so that the oil level is just
at the top of the central tube. |
An oil bath air
cleaner should be completely flooded with oil so that the wire-mesh element
is kept completely submerged in oil. |
| The main engines
on your supply boat are protected with a low crankcase oil level detector
protective device designed to provide an alarm when the main sump oil level
drops below a certain level. It is malfunctioning, and upon investigation
you determine from the technical manual that the oil level detector is a
sealed unit. What statement best represents the best strategy to remedy
this situation? |
The oil level
detector is adjusted just as if it was an unsealed unit, without regard
to any seals associated with the unit. |
The oil level
detector must be replaced with a new detector if it is found to be defective,
since field adjustments are not possible on this type of unit. |
The oil level
detector is adjusted just as if it was an unsealed unit, but the seals must
be re- established before placing the unit back into operation. |
The oil level
detector seals must be broken before adjustments can be made, as long as
new seals are established before placing the unit back into operation. |
| The main propulsion
diesel engines fitted on your river push boat are of the type shown in the
illustration. What type of starting system do engines of this type usually
employ? Illustrations MP-MS-04 |
Hydraulic cranking
motor |
Electric cranking
motor |
Direct air admission
to the cylinders |
Air cranking motor |
| The oil-fired
auxiliary boiler on your river push boat experiences a safety shutdown requiring
a reset of the flame safeguard control to restart the boiler once the safety
shutdown condition has been corrected. Which of the following conditions
would best account for this? |
Loss of feed pump
suction. |
High steam pressure. |
High water level. |
Loss of fuel pump
suction. |
| Since towing vessels
take on fresh water from shore as a source of make-up water for the closed,
re-circulating cooling water systems supporting diesel engines, what property
of the make-up water is most important in contributing to cooling system
problems? |
The amount of
dissolved oxygen (and other various gases). |
The amount of
dissolved solids associated with mineral content. |
The degree of
contamination of suspended solids, such as sand. |
The degree of
contamination with microbiological organisms. |
| The auxiliary
oil-fired water-tube steam boiler on your tug is equipped with a water column
similar to that shown in the illustration. The most accurate way to determine
the boiler water level is by alternately opening and reclosing the tri-cocks.
At what point is the normal operating water level (NOWL) of the boiler?
Illustration MO-0093 |
At a point coinciding
with the uppermost tri-cock. |
At a point coinciding
with the middle tri-cock. |
At a point coinciding
with the lowermost tri-cock. |
The level can
normally be anywhere within the water column. |
| The pneumatic
propulsion control system used on your anchor-handling supply vessel uses
a diaphragm-operated relay valve as shown in the illustration. Periodically,
the valve is to be disassembled for cleaning and inspection. What statement
best describes the proper method for servicing the in-line strainers? Illustration
MO-0052 |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with low pressure compressed air. |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with high pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with high pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with low pressure compressed air. |
| The manufacturer
of the main propulsion diesel engines on your harbor tug specifies the requirements
for fresh water makeup for the closed, re-circulating fresh water cooling
system as shown in the illustration. Which of the following examples of
fresh water test results would be considered acceptable by the manufacturer
for coolant makeup or initial filling? Illustration MP-WC-05 |
{{{
Total solids: 10.6 grains/gal
pH at 20°C: 4.5
Chloride ions: 1.7 grains/gal
Sulfate ions: 3.4 grains/gal}}} |
{{{
Total solids: 28.7 grains/gal
pH at 20°C: 6.8
Chloride ions: 2.3 grains/gal
Sulfate ions: 5.7 grains/gal}}} |
{{{
Total solids: 17.2 grains/gal
pH at 20°C: 7.2
Chloride ions: 4.2 grains/gal
Sulfate ions: 5.3 grains/gal}}} |
{{{
Total solids: 8.4 grains/gal
pH at 20°C: 7.8
Chloride ions: 1.3 grains/gal
Sulfate ions: 2.6 grains/gal}}} |
| While on deck,
you are observing the stack of an oil-fired auxiliary boiler installed on
your salvage tug. The gases exiting the stack are a dense white smoke. Eliminating
water vapor as a possible cause of the white smoke, what would be the correlating
flame color as observed through an observation window peephole? |
Yellowish orange
or golden yellow flame. |
Reddish flame. |
Yellow flame. |
Dull or dazzling
white flame. |
| In a closed, re-circulating
fresh water cooling system used for the main engines on your river push
boat, what function would chemical treatment with molybdate primarily perform? |
Corrosion inhibition. |
Freezing point
depression. |
Biological growth
inhibition. |
Boiling point
elevation. |
| The heating boiler
on your multi-purpose supply vessel is of the type shown in the illustration.
Which of the following arrangements describe a boiler of this type? Illustration
MP-SP-11 |
The boiler is
of the water-tube type and utilizes natural circulation. |
The boiler is
of the fire-tube type and utilizes natural circulation. |
The boiler is
of the water-tube type and utilizes forced circulation. |
The boiler is
of the fire-tube type and utilizes forced circulation. |
| When starting
a towing winch drive engine in preparation for towing operations, what parameter
must be checked FIRST upon start-up to avoid immediate engine damage? |
Cylinder jacket
water pump discharge pressure. |
Fuel oil supply
header pressure. |
Engine lubricating
oil supply header pressure. |
Winch gear oil
pump discharge pressure. |
| After a main diesel
engine on your river push boat has experienced a safety shutdown due to
excessive crankcase pressure, why is it important to wait 2 hours before
opening the crankcase to investigate the cause of the trip? |
Opening the crankcase
before 2 hours has elapsed may result in excessively rapid cooling. |
Opening the crankcase
before 2 hours has elapsed may result in the engine spontaneously restarting. |
Opening the crankcase
before 2 hours has elapsed may result in crankshaft rotation. |
Opening the crankcase
before 2 hours has elapsed may result in a crankcase explosion. |
| The main propulsion
diesel engines on your towing vessel are fitted with mechanically operated
and controlled unit injectors. In order for the engine to run properly,
the injectors must be properly timed relative to the camshaft and properly
synchronized relative to the other injectors. In terms of timing and synchronization,
what statement is true? |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, but injector synchronization is achieved by adjusting the
control racks of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, but injector synchronization is achieved by adjusting the cam follower
heights of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, and injector synchronization is also achieved by adjusting
the cam follower heights of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, and injector synchronization is also achieved by adjusting the
control racks of the injectors to the proper setting. |
| The offshore supply
vessel to which you are assigned is gear-driven with one main propulsion
diesel engine and a fixed-pitch propeller. While underway, the main engine
becomes disabled, requiring your vessel to be towed back into port. If pressurized
lubricating oil is not available to the reduction gear shaft bearings, what
must be done during the towing operation? |
The reduction
gear input shaft must be prevented from rotating by means of engaging the
engine turning gear at the flywheel. |
The reduction
gear output shaft must be prevented from rotating by means of locking the
propeller shaft. |
The reduction
gear input shaft must be prevented from rotating by means of engaging the
propulsion clutch. |
The reduction
gear input and output shafts must be prevented from rotating by means of
blocking the gear teeth. |
| The main engines
on your ocean-going tug are equipped with manual shutdown levers as shown
in the illustration. What statement concerning manual shutdown is true?
Illustration MP-IC-15 |
The manual shutdown
lever is operated by means of a remote pull cable and uses the over speed
trip mechanism to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of the over speed trip reset lever and uses the
over speed trip mechanism to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of a remote pull cable and uses the governor
fuel control linkage to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of the emergency trip reset lever and uses the
governor fuel control linkage. |
| While warming
up the main engines on your harbor tug while tied up at your own pier, one
of the main engines suddenly sounds the low lube oil pressure alarm. What
is the appropriate initial response? |
Immediately shutdown
the engine, then investigate the cause for the low pressure alarm. |
Immediately add
make-up oil or service lube oil coolers, strainers, and filters, as appropriate. |
Reduce the load
and speed on the engine and continue to monitor the oil pressure. |
Monitor closely
oil pressures, temperatures, and levels while continuing to run the engine. |
| You are analyzing
the data used for trend analysis for one of the 2-stroke turbocharged main
propulsion diesel engines on your ocean-going tug. Over time the scavenging
air receiver (air box) pressure is steadily increasing. What condition would
produce this data? |
The turbocharger
air inlet screen is gradually becoming fouled. |
The engine air
intake filter is gradually becoming fouled. |
The scavenging
air ports are gradually becoming restricted with carbon. |
The air side of
the turbocharger after cooler is gradually becoming fouled. |
| You are assigned
as an engineer on an offshore oil spill response vessel using main propulsion
engines of the type shown in the illustration. Assuming that the piston
is properly positioned, what statement represents the procedure for inspection
of the compression rings while in place inside the engine? Illustration
MP-MS-04 |
The inspection
takes place by removing the appropriate oil pan cover and viewing through
the resulting opening. |
The inspection
takes place by removing the appropriate cylinder head valve cover and viewing
through the resulting opening. |
It is not possible
to inspect the compression rings while in place inside the engine. |
The inspection
takes place by removing the appropriate air box handhold cover and viewing
through the resulting opening. |
| The fresh water
cooling systems serving the main engines on your river push boat are arranged
as shown in the illustration. If the fresh water thermostatic control valve
fails in the position where 100% of the flow from flange "A" is
permanently ported to flange "C" and flange "B" is permanently
blocked, while starting and warming the engine with no load, what would
be the resulting warm up time period? MP-CW-15 |
With no load,
the engine would require a relatively normal time frame to warm up. |
With no load,
the engine would require a much shorter than normal time frame to warm up. |
With no load,
it is not possible to describe the time frame required to warm up the engine. |
With no load,
the engine would require a much longer than normal time frame to warm up. |
| The main propulsion
diesel engines on your platform supply vessel are protected with a high
coolant temperature switch used as an alarm contact maker to warn operating
personnel of the potential danger of an overheated engine. If the switch
is fitted with a test button, what is this used for? |
The test button
is used to test the alarm circuit whenever it is deemed necessary to do
so. |
The test button
is used to determine the actual alarm point temperature. |
The test button
is used to reset the switch to clear an actual alarm condition. |
The test button
is used every time the engine is started to test the alarm circuit prior
to start- up. |
| The articulated
tug-barge unit to which you are assigned is fitted with generator drive
engines of the type shown in the illustration. In terms of operating cycle
and cylinder configuration, what statement is true? Illustration MP-HS-04 |
This is a two-stroke
cycle, 45o V-type engine. |
This is a four-stroke
cycle, 90o V-type engine. |
This is a four-stroke
cycle, 45o V-type engine. |
This is a two-stroke
cycle, 90o V-type engine. |
| The main engines
on your offshore supply vessel are fitted with speed control governors based
on the operating principle shown in the illustration. What statement is
true concerning the illustrated pressure-compensated governor? Illustration
MP-GV-18 |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted to vertical and the pilot valve plunger will
be in the centered position blocking off the control port. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted inward and the pilot valve plunger will be in
the raised position aligning the control port to the pressure port. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted to vertical and the pilot valve plunger can be
positioned in any position. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted outward and the pilot valve plunger will be in
the lowered position aligning the control port to the drain port. |
| The raw water
boxes of the fresh water coolers serving the main propulsion diesel engines
on your offshore supply vessel are fitted with sacrificial zinc anodes.
Upon inspection, at what percentage of deterioration should the zinc anodes
be replaced? |
25 (%) |
50 (%) |
75 (%) |
100 (%) |
| You are replacing
a damaged high pressure fuel injection line for #1 cylinder on an auxiliary
diesel engine onboard your towing vessel. Which of the following statements
represents the best replacement practice or strategy? |
Custom fabricate
the fuel injection line minimizing length and bends to create the shortest
possible replacement fuel injection line. |
Custom fabricate
the fuel injection line as close as possible to the fuel injection line
being replaced in terms of bends and overall length. |
Replace the damaged
fuel injection line with a custom fabricated line without regard to the
length and configuration of the bends of the original. |
Replace the damaged
fuel injection line with a factory-formed fuel injection line specifically
fabricated for #1 cylinder line replacement. |
| The offshore supply
vessel to which you are assigned has diesel generators fitted with fuel
injectors of the type shown in figure "2" of the illustration.
What statement is true concerning this type of injector? Illustration MP-FI-20 |
The injector is
of the open type and features port and helix metering. |
The injector is
of the closed type and features pressure-time metering. |
The injector is
of the open type and features pressure-time metering. |
The injector is
of the closed type and features port and helix metering. |
| The river push
boat to which you are assigned has diesel generators fitted with fuel injectors
with the operating principle as shown in the illustration. In figure "B"
which plunger rotation position corresponds to the engine running under
no load at idle RPM? Illustration MP-FI-12 |
1 |
2 |
3 |
4 |
| Evidence of low
temperature corrosion is observed on the combustion space components of
a slow- speed diesel engine. What causes this corrosion and what can one
do to mitigate this situation? |
Sulfur from the
fuel condensing on cold surfaces forming sulfuric acid. Ensure cooling water
temperatures maintain the combustion space temperatures above the dew point
of sulfuric acid. |
Low temperature
corrosion cannot be observed; it has to be determined by metallurgical testing.
Maintain cooling water temperatures as per manufacturer's specifications. |
Vanadium from
fuel melting in the exhaust gases. Maintain lower cooling water temperature
to prevent vanadium from melting. |
Sulfur in exhaust
gas mixing with water vapor condensation. Order cylinder oil of lower total
base number. |
| The harbor tug
to which you are assigned has main propulsion engines of the type shown
in the illustration. In terms of operating cycle, scavenging flow pattern,
and piston type, what statement is true concerning this engine type? Illustration
MP-MS-04 |
This is a two-stroke
cycle, loop-scavenged, trunk type piston engine. |
This is a two-stroke
cycle, uniflow-scavenged, trunk type piston engine. |
This is a two-stroke
cycle, uniflow-scavenged, crosshead type piston engine. |
This is a four-stroke
cycle, uniflow-scavenged, trunk type piston engine. |
| The platform supply
vessel to which you are assigned has a pneumatic propulsion control system
as shown in the illustration. What statement is true concerning transfer
of control? Illustration MP-IC-12 |
The transfer valve
at the pneumatic remote control station is used to transfer control of propulsion
from the pneumatic remote control station to the mechanical slave remote
control station or vice versa. |
The transfer valve
at the engine room control station is used to transfer control of propulsion
from the engine room control station to the pilot house pneumatic master
control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
mechanical slave remote control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
engine room control station or vice versa. |
| The diesel engines
on your anchor-handling supply vessel are all protected with dry-type air
filters. When changing filter elements what visual indication would cause
you to suspect that the engine has been contaminated with dust as the result
of improperly sealing of the filter element gasket? |
The "clean"
side of the air filter element is streaked with dust. |
The "dirty"
side of the air filter element is coated with dust. |
The "clean"
side of the air filter element is clean and free of dust. |
The "dirty"
side of the air filter housing is coated with dust. |
| The lubricating
oil system supporting the main propulsion reduction gear on the salvage
tug to which you are assigned is fitted with a sea water cooled 4-pass shell
and tube lube oil cooler. The water box sacrificial zinc anodes must be
inspected periodically. Which of the following listed actions correctly
states maintenance criteria pertaining to scale build-up on the zincs? |
Any accumulated
scale build-up on sacrificial zinc anodes should be scraped off until the
zinc anodes are shiny. |
Any sacrificial
zinc anodes with accumulated scale build-up should be replaced regardless
of the degree of deterioration. |
Any accumulated
scale build-up on sacrificial zinc anodes should be left intact to ensure
proper protection from galvanic corrosion. |
There is no need
to check for scale build-up on the sacrificial zinc anodes as this phenomenon
is not physically possible. |
| The main propulsion
diesel engines fitted on your multi-purpose offshore supply vessel are started
with compressed air using the system illustrated. What is the starting method
used with this system? Illustration MP-SR-07 |
Air cranking motor(s). |
Hydraulic cranking
motor(s) with air over hydraulics. |
Direct air admission
with air start distributor. |
Direct air admission
with cam actuated air start valves. |
| For corrosion
to take place within the closed, re-circulating cooling water system of
a marine diesel engine, an electro-chemical cell must exist where the cooling
water is electrically conductive. Which of the following factors has the
greatest influence on electrical conductivity? |
The amount of
dissolved solids in the water. |
The temperature
of the water. |
The pH of the
water. |
The amount of
dissolved oxygen in the water. |
| Great care should
be taken to prevent a day tank from being pumped empty while a diesel engine
is in operation. If this does happen on your OSV, the engine fuel and fuel
injection system must be reprimed. What is accomplished during repriming? |
The system is
being flushed with fuel to remove entrained moisture. |
The system is
being treated with a starting aid such as diethyl ether. |
The system is
being purged with fuel to remove entrained air. |
The system is
being flushed with fuel to remove solid impurities. |
| A diesel engine
driven winch on your offshore supply vessel is fitted with a reversing reduction
gear equipped with dry-type friction clutches. Which of the operational
conditions listed below is most likely to result in clutch slippage and
associated clutch disc wear? |
Habitually engaging
the clutch at engine idle speed. |
Habitually disengaging
the clutch at engine idle speed. |
Habitually disengaging
the clutch at high engine speed. |
Habitually engaging
the clutch at high engine speed. |
| When servicing
dry-type air filters as used on the towing vessel to which you are assigned,
which of the following criteria would be the most accurate for determining
the need for servicing? |
Estimation of
severity of dust conditions at the air intake |
Determination
of operating hours since last servicing |
Determination
of engine room fresh air exchange rate |
Determination
of restriction with suitable gauge |
| The auxiliary
oil-fired water-tube steam boiler on your sea-going tug is equipped with
a water column similar to that shown in the illustration. If the gauge glass
becomes disabled or there is uncertainty associated with the gauge glass
reading, the tri-cocks can be used to determine the boiler water level.
What statement best describes the challenge associated with trying to differentiate
between steam and water? Illustration MO-0093 |
On a tri-cock
situated below the water level, when opened all of the escaping water will
flash to steam. |
On a tri-cock
situated above the water level, when opened all of the escaping steam will
condense to water. |
On a tri-cock
situated above the water level, when opened some of the escaping steam will
condense to water. |
On a tri-cock
situated below the water level, when opened some of the escaping water will
flash to steam. |
| The main engines
on your oil platform supply vessel are fitted with speed control governors
of the type shown in the illustration. If the shutdown solenoid is de-energized
during normal operation, which of the following scenarios depicts the response
on a safety shutdown where the shutdown plunger rod moves downward unseating
the ball check valve when the shutdown solenoid energizes? Illustration
MP-IC-14 |
The servo piston
rod moves upward. The power cylinder tail rod moves upward. |
The servo piston
rod moves downward. The power cylinder tail rod moves upward. |
The servo piston
rod moves upward. The power cylinder tail rod moves downward. |
The servo piston
rod moves downward. The power cylinder tail rod moves downward. |
| If the speeder
spring of a diesel engine governor breaks while operating at full load,
the engine RPM will __________. |
hunt until stabilized
by the droop rod |
increase until
the overspeed trip is actuated |
decrease to a
slightly lower value |
remain the same
until manually changed |
| When starting
a main propulsion diesel engine fitted with attached pumps in preparation
for getting underway on your towboat, what parameter must be checked FIRST
upon start-up to avoid immediate engine damage? |
Lubricating oil
supply header pressure. |
Cylinder jacket
water pump discharge pressure. |
Sea water pump
discharge pressure. |
Fuel oil supply
header pressure. |
| The two-stroke
cycle main propulsion engines on the platform supply vessel to which you
are assigned are fitted with turbochargers for scavenging purposes. Assume
that you are checking the air box drains in an installation that is valved
with external drain piping to a drains tank. When you open the air box drain
valves, no drainage occurs when in fact there is an accumulation of oil
and moisture on the floor of the air boxes. What should you do? |
Blow through the
drain openings with compressed air to clear the drains. |
Increase the air
box pressure to blow the air box drain openings clear. |
Increase the crankcase
pressure to blow the air box drain openings clear. |
Mechanically poke
through the drain openings with a rod to clear the drains. |
| While taking a
round in the engine room of your harbor tug, when is the best time to check
the cylinder jacket water expansion tank level on a heat exchanger-cooled
diesel generator with a pressurized cooling system where no sight glass
or float indicator is provided? |
It is best to
check the level by removing the pressure cap when the engine is running
with no load for several minutes. |
It is best to
check the level by removing the pressure cap immediately after the engine
has been shut down. |
It is best to
check the level by removing the pressure cap when the engine is running
under load and at operating temperature. |
It is best to
check the level by removing the pressure cap after the engine has been shut
down and has had a chance to cool down. |
| The generator
drive diesel engines on your supply boat are fitted with a multi-plunger
injection pump with high pressure fuel lines leading to each hydraulically
operated injector. If the engine is allowed to run out of fuel, it may become
necessary to purge the high pressure fuel lines of air. How is this accomplished? |
Slackening each
high pressure fuel line fitting at the fuel injector while cranking over
the engine with the starter and allowing air to escape, then retightening
when air bubbly fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while stroking the
manually operated priming pump and allowing air to escape, then retightening
when bubbly fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while stroking the
manually operated priming pump and allowing air to escape, then retightening
when a solid stream of fuel is observed. |
Slackening each
high pressure fuel line fitting at the fuel injector while cranking over
the engine with the starter and allowing air to escape, then retightening
when a solid stream of fuel is observed. |
| The main engine
thrust bearing shown in the illustration contains how many thrust shoes?
Illustration MO-0121 |
6 |
10 |
12 |
20 |
| The fresh water
cooling systems serving the main engines of the platform supply vessel to
which you are assigned are arranged as shown in the illustration. What statement
best describes the arrangement of the fresh water keel cooler shown in the
system diagram? Illustration MP-CW-16 |
The keel cooler
is mounted on the outside of the hull above the water line. |
The keel cooler
is mounted on the inside of the hull above the water line. |
The keel cooler
is mounted on the inside of the hull below the water line. |
The keel cooler
is mounted on the outside of the hull below the water line. |
| You are replacing
an automotive type cooling water thermostat on one of the diesel generator
sets on your ship docking tug. The markings on the original thermostat indicate
that it was set to begin opening at 180°F. Which of the following thermostats
marked for Celsius would be a replacement that comes closest to the value
at which opening begins as compared to the original thermostat? |
70°C |
80°C |
90°C |
100°C |
| The various auxiliary
diesel engines fitted on your ship-docking tug may employ a variety of different
starting systems. What is the source of potential energy used to produce
torque for the illustrated cranking motor? Illustration MP-SR-06 |
Compressed air
receiver |
Electric storage
battery |
Diesel fuel day
tank |
Hydraulic accumulator |
| When cleaning
burner atomizers associated with an oil-fired auxiliary boiler fitted on
your offshore supply boat, which of the following metals would be recommended
to use in fabricating a tool for the purposes of carbon removal? |
Cromoly steel |
Copper |
Tungsten |
Titanium |
| The fresh water
cooling systems serving the main engines on your offshore supply vessel
are arranged as shown in the illustration. If there is excessive scale build
up inside the tubes of an engine's shell and tube RW/FW heat exchanger,
while the engine is in operation, what would be the resulting symptoms?
MP-CW-15 |
A decreased temperature
rise on the raw water side, and a decreased temperature drop on the fresh
water side. |
A increased temperature
rise on the raw water side, and a decreased temperature drop on the fresh
water side. |
A decreased temperature
rise on the raw water side, and a increased temperature drop on the fresh
water side. |
A increased temperature
rise on the raw water side, and a increased temperature drop on the fresh
water side. |
| The articulated
tug-barge unit to which you are assigned has a pneumatic propulsion control
system as shown in the illustration. What must be the position of the two
transfer valves within the system when the mechanical slave remote control
station is being used to control propulsion? Illustration MP-IC-12 |
The transfer valve
at the engine room control station must be in the engine room position and
the transfer valve at the pilot house pneumatic master control station must
be in the pilot house position. |
The transfer valve
at the engine room control station must be in the pilot house position and
the transfer valve at the pilot house pneumatic master control station must
be in the pneumatic remote control position. |
The transfer valve
at the engine room control station must be in the engine room position and
the transfer valve at the pilot house pneumatic master control station must
be in the pneumatic remote control position. |
The transfer valve
at the engine room control station must be in the pilot house position and
the transfer valve at the pilot house pneumatic master control station must
be in the pilot house position. |
| What maintenance
practice represents the best protection against moisture carryover to the
fuel injection system of the main engines on board your general purpose
supply vessel? |
Frequently replacing
fuel injection pump and injector nozzle inlet fuel filters. |
Periodically opening,
then reclosing, the drain valve on coalescing type diesel oil filters. |
Closing the diesel
oil day tank vents, particularly when the relative humidity is high. |
Periodically opening,
then reclosing, the vent valve on coalescing type diesel oil filters. |
| The main propulsion
diesel engines fitted on your salvage tug are equipped with engine crankcase
oil level dipsticks marked on both sides of the dipstick. What is the significance
of the markings? |
The add and full
marks on both sides correspond to one another and are identically placed.
Either side can be used accurately no matter what is the running status
of the engine and what is the temperature of the oil. |
The add and full
marks on one side correspond to the side to be used when the engine is STOPPED
and the engine oil is COLD. On the other side, the marks correspond to side
to be used when the engine is running at IDLE RPM and the engine oil is
HOT. |
The add and full
marks on one side correspond to the side to be used when the engine is STOPPED
and the engine oil is HOT. On the other side, the marks correspond to side
to be used when the engine is running at IDLE RPM and the engine oil is
COLD. |
The add and full
marks on one side correspond to the side to be used when the engine is running
at IDLE RPM and the engine oil is COLD. On the other side, the marks correspond
to side to be used when the engine is running at MAXIMUM RPM and the engine
oil is HOT. |
| You are assigned
to a platform supply vessel fitted with main propulsion diesel engines of
the type shown in the illustration. If the engine's crankshaft is turning
at 900 rpm, what will be the rotational speed of the two camshafts? Illustration
MP-MS-04 |
450 rpm |
900 rpm |
1800 rpm |
Not enough information
is given to determine camshaft rpm. |
| The fresh water
cooling systems serving the main engines on your salvage tug are arranged
as shown in the illustration. What statement best describes the functioning
of the fresh water thermostatic control valve shown in the system diagram?
MP-CW-16 |
The fresh water
thermostatic control valve controls the engine fresh water outlet temperature
and is set up as a 3-way mixing valve. |
The fresh water
thermostatic control valve controls the engine fresh water inlet temperature
and is set up as a 3-way mixing valve. |
The fresh water
thermostatic control valve controls the engine fresh water inlet temperature
and is set up as a 3-way diverting valve. |
The fresh water
thermostatic control valve controls the engine fresh water outlet temperature
and is set up as a 3-way diverting valve. |
| For the typical
marine turbocharged main propulsion diesel engine, where is the usual location
for the air intake filter and silencer? |
The air intake
filter/silencer usually is local to the engine and surrounds the circumference
of the turbocharger turbine inlet. |
The air intake
filter/silencer usually is remote from the engine and is mounted in a protected
area above the weather deck. |
The air intake
filter/silencer usually is local to the engine and surrounds the circumference
of the turbocharger blower/compressor inlet. |
The air intake
filter/silencer usually is remote from the engine, but still in the engine
room mounted on a convenient bulkhead. |
| Wire brushing
and scraping can be used to remove hard carbon deposits from exhaust system
surfaces. When cleaning exhaust systems associated with the diesel engines
on the tug to which you are assigned, what technique can effectively be
used in conjunction with mechanical cleaning to loosen and soften up these
hard carbon deposits? |
Sand blasting
with diamond dust |
Treating with
carbon penetrating solvent |
Baking off carbon
with heat lamps |
Treating with
carbon tetrachloride solvent |
| You are inspecting
the blower of a Roots-blown, two-stroke cycle main propulsion engine on
the ocean-going tug to which you are assigned and discover the presence
of aluminum dust on the rotors and on the air duct surfaces. What would
most likely be the direct cause of this? |
Restricted scavenging
air intake ports. |
Worn blower rotor
shaft bearings. |
Restricted blower
air intake filter. |
Worn blower rotor
shaft seals. |
| Wire brushing
and scraping can be used to remove hard carbon deposits from exhaust system
surfaces. When cleaning exhaust systems associated with the diesel engines
on the fishing trawler to which you are assigned, what technique can effectively
be used in conjunction with mechanical cleaning to loosen and soften up
these hard carbon deposits? |
Baking off carbon
with heat lamps. |
Sand blasting
with diamond dust. |
Treating with
carbon tetrachloride solvent. |
Treating with
carbon penetrating solvent. |
| The letters "NPT"
used in the notation 1/8-27 NPT as shown in the illustration, indicates
the __________. Illustration GS-0010 |
class of finish |
thread series |
class of fit |
thread profile |
| The main diesel
engines on your coast-wise tug are protected with an array of devices designed
to provide an alarm or possible shutdown for various unsafe conditions.
During the maintenance procedure for adjusting the alarm and/or trip point
setting for such a device, which of the following devices would have a time
delay associated with it? |
Engine crankcase
high pressure trip/alarm device. |
Engine over speed
trip/alarm device. |
Engine low lube
oil pressure trip/alarm device. |
Engine coolant
high temperature alarm device. |
| When interpreting
the engine lube oil supply header pressures for the main engines on your
river push boat, what statement is true assuming that the lube oil pump
is engine-driven? |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to decrease. |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to increase. |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to increase. |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to decrease. |
| You are analyzing
the data used for trend analysis for one of the main propulsion diesel engines
on the ship-docking tug to which you are assigned. The cylinder exhaust
temperature of one of the cylinders is significantly lower than the others.
When analyzing compression and firing pressure data, however, the numbers
are within the normal range for this particular cylinder. What condition
would produce these results? |
Excessive carbon
build-up on air inlet ports or valves of affected cylinder. |
Leaking fuel injector
needle valve for affected cylinder. |
Leaking exhaust
valve on affected cylinder. |
Excessive carbon
build-up on exhaust pyrometer probe of affected cylinder. |
| In a closed, re-circulating
fresh water cooling system used for the main engines on your sea-going salvage
tug, what function would chemical treatment with nitrites primarily perform? |
Freezing point
depression. |
Boiling point
elevation. |
Corrosion inhibition. |
Biological growth
inhibition. |
| The diesel engines
on your towing vessel are all protected with dry-type air filters. The air
filters should be inspected and replaced in accordance with manufacturer
instructions. What is the generally accepted criteria that would dictate
when filter replacement becomes necessary? |
The air filter
element should be replaced when the pressure drop across the element increases
above the specified maximum. |
The air filter
element should be replaced when the pressure rise across the element decreases
below the specified minimum. |
The air filter
element should be replaced when the pressure drop across the element decreases
below the specified minimum. |
The air filter
element should be replaced when the pressure rise across the element increases
above the specified maximum. |
| When rolling over
a main engine on your river push boat prior to starting with the cylinder
test valves open to expel any fluids accumulated within the cylinders, a
rather large amount of water is discharged. What is the appropriate response? |
Do not allow the
engine to be started until the cause of the water discharge has been determined
and corrected. |
Start the engine,
but monitor all fluid levels very closely, especially that of the jacket
water. |
Start the engine,
but run the engine with the cylinder test valves cracked slightly open. |
Start the engine,
but maintain the jacket water expansion tank level higher than normal. |
| The harbor tug
to which you are assigned is fitted with 4-stroke cycle, 6-cylinder in-line
diesel generator sets. Using the chart shown in the illustration, what is
the firing order of the engines? Illustration MP-HS-05 |
1-2-3-4-5-6 |
1-4-2-6-3-5 |
1-5-3-6-2-4 |
Not enough information
is provided to determine the firing order. |
| The main propulsion
main engines on the ship-docking tug to which you are assigned are fitted
with turbochargers as shown in the illustration. What statement is true
concerning the over-running clutch and gear-drive train as fitted to this
turbocharger type? Illustration MP-CA-08 |
The turbocharger
is gear-driven under all engine load and starting conditions, and as such
is considered both exhaust gas and mechanically driven. |
The turbocharger
is free-wheeling and exhaust gas driven under all engine load and starting
conditions, and mechanical drive arrangements are for emergency use only. |
The turbocharger
is gear-driven from the engine under low load and starting conditions only.
Under high load conditions, the turbocharger is free-wheeling and exhaust
gas driven. |
The turbocharger
is gear-driven from the engine under high load conditions only. Under low
load and starting conditions, the turbocharger is free-wheeling and exhaust
gas driven. |
| The main propulsion
engines onboard your harbor tug use a lubricating oil system as shown in
the illustration. What item number represents the scavenging lube oil pump?
Illustration MP-LO-07 |
2 |
4 |
9 |
12 |
| You are on a ship-docking
tug using main propulsion engines of the type shown in the illustration.
Assuming that the piston is properly positioned, what statement represents
the procedure for inspection of the compression rings while in place inside
the engine? Illustration MP-MS-07 |
It is not possible
to inspect the compression rings while in place inside the engine. |
The inspection
takes place by removing the appropriate side cover and viewing through the
resulting opening. |
The inspection
takes place by removing the appropriate crankcase access door and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate cylinder head valve cover and viewing
through the resulting opening. |
| Exhaust system
back pressure is customarily measured at the discharge of a turbocharger.
If the exhaust system back pressure is higher than normal for a given engine
load on your salvage tug at the point of measurement, which of the following
conditions would most likely account for this? |
Restricted turbocharger
turbine inlet screen. |
Restricted turbocharger
air intake filter. |
Restricted exhaust
silencer/muffler. |
Restricted exhaust
ports or valves. |
| Prior to starting
a main propulsion diesel engine fitted on your salvage tug, it has been
determined that the transfer of make-up oil is required. At what checked
level should you stop adding make-up oil? |
When the oil level
rises to the FULL mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
rises to the between the ADD and FULL marks on the side of the dipstick
marked ENGINE STOPPED and OIL COLD. |
When the oil level
rises to the ADD mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
rises to a level well above the FULL mark on the side of the dipstick marked
ENGINE STOPPED and OIL COLD. |
| The engine manufacturer
for the main engines used on your harbor tug specifies a supplemental coolant
additive consisting of molybdate and nitrite be used to supplement the heavy-duty
antifreeze for the closed, re-circulating fresh water cooling system. A
test-strip comparison chart as shown in the illustration is used for coolant
testing purposes. If the molybdate concentration color corresponds to row
2 and the nitrite concentration color corresponds to column B, what statement
is true? Illustration MP-WC-12 |
The molybdate
and nitrite concentrations levels are too high, and a portion of the coolant
must be drained and replaced with fresh water. |
The molybdate
and nitrite concentrations levels are too low, and additional supplementary
coolant additive is required. |
The molybdate
and nitrite concentrations levels are within acceptable limits, and no further
correction is required. |
It is not possible
to determine the molybdate and nitrite concentration levels from the information
given. |
| The river pushboat
to which you are assigned is fitted with main propulsion reduction gears
as shown in the illustration. What statement is true concerning this type
of reduction gear? Illustration MP-DS-16 |
This type of reduction
gear is used with a controllable pitch propeller and a non-reversing engine. |
This type of reduction
gear is used with a controllable pitch propeller and a reversing engine. |
This type of reduction
gear is used with a fixed pitch propeller and a non-reversing engine. |
This type of reduction
gear is used with a fixed pitch propeller and a reversing engine. |
| The generator
drive engines fitted on your articulated tug-barge unit are started by the
type of starter shown in figure "B" of the illustration. What
is the purpose of the gear train situated between the air turbine rotor
shaft and the pinion shaft? Illustration MP-SR-09 |
It DECREASES the
speed of the pinion shaft as compared to the air turbine rotor shaft for
the purposes of DECREASING starter motor torque. |
It INCREASES the
speed of the pinion shaft as compared to the air turbine rotor shaft for
the purposes of INCREASING starter motor torque. |
It INCREASES the
speed of the pinion shaft as compared to the air turbine rotor shaft for
the purposes of DECREASING starter motor torque. |
It DECREASES the
speed of the pinion shaft as compared to the air turbine rotor shaft for
the purposes of INCREASING starter motor torque. |
| The ship-docking
tug to which you are assigned has a fire pump drive engine as shown in the
illustration. What statement concerning common air inlet and exhaust outlet
pressures is true, if the engine is running at rated speed? Illustration
MP-IX-11 |
There is no predictable,
consistent relationship between the common exhaust outlet and air inlet
pressures. |
The common exhaust
outlet pressure will be lower than the common air inlet pressure. |
The common exhaust
outlet pressure will be equal to the common air inlet pressure. |
The common exhaust
outlet pressure will be higher than the common air inlet pressure. |
| You have just
replaced a mechanically operated unit injector on a two-stroke cycle auxiliary
diesel engine's #1 cylinder on your river push boat. You are using an injector
timing tool to set the injector follower height. To do this you must ensure
that the fuel cam follower is riding on the fuel cam base circle. Which
of the following statements represents the best assurance that the crankshaft
is properly positioned? |
The crankshaft
should be barred in the direction of rotation until the #1 cylinder's intake
valves are fully opened. |
The crankshaft
should be barred in the direction of rotation until the #1 cylinder's intake
valves are fully closed. |
The crankshaft
should be barred in the direction of rotation until the #1 cylinder's exhaust
valves are fully opened. |
The crankshaft
should be barred in the direction of rotation until the #1 cylinder's exhaust
valves are fully closed. |
| The deck winch
drive engine onboard your salvage tug uses a lubricating oil filtration
scheme as shown in the illustration. What type of filtration system is illustrated?
Illustration MP-LO-06 |
Sump filtration |
Shunt filtration |
Bypass filtration |
Full-flow filtration |
| The tractor tug
to which you are assigned has main engines fitted with intake and exhaust
systems as shown in the illustration. What statement best describes the
configuration of the multiple turbochargers? Illustration MP-IX-08 |
Two (2) turbochargers
are used, one for each cylinder bank, to reduce exhaust back pressure. |
Four (4) turbochargers
are used and configured in series for a four-staging effect to boost charge
air pressure. |
Two (2) turbochargers
are used and configured in series for a two-staging effect to boost charge
air pressure. |
Four (4) turbochargers
are used, two for each cylinder bank, to reduce exhaust back pressure. |
| You are assigned
to a river push boat fitted with main propulsion diesel engines operating
on the cycle represented in the polar timing diagram shown in the illustration.
In consideration of the direction of rotation, what combustion cycle event
occurs from point "A" to point "D"? Illustration MO-0084 |
Compression |
Intake |
Exhaust |
Power |
| The fresh water
cooling systems serving the main engines of the towing vessel to which you
are assigned are arranged as shown in the illustration. What statement best
describes the arrangement of the fresh water keel cooler shown in the system
diagram? Illustration MP-CW-16 |
The keel cooler
is mounted on the outside of the hull above the water line. |
The keel cooler
is mounted on the outside of the hull below the water line. |
The keel cooler
is mounted on the inside of the hull below the water line. |
The keel cooler
is mounted on the inside of the hull above the water line. |
| The generator
drive engines fitted on your harbor tug are started by the type of starter
shown in figure "A" of the illustration. What type of starter
is shown? Illustration MP-SR-09 |
Radial piston
hydraulic motor |
Turbine type air
motor |
Axial piston hydraulic
motor |
Sliding vane air
motor |
| The tractor tug
to which you are assigned is fitted with main propulsion diesel engines
of the type shown in the illustration. In terms of valve operating gear,
cylinder liner type, and connecting rod type, what statement is true? Illustration
MP-MS-12 |
This is a pushrod
operated overhead valve engine, with jacketed cylinder liners and conventional
connecting rods. |
This is a pushrod
operated overhead valve engine, with wet cylinder liners and hinged-strap,
fork-and-blade connecting rods. |
This is an overhead
cam engine, with jacketed cylinder liners and hinged-strap, fork-and- blade
connecting rods. |
This is an overhead
cam engine, with wet cylinder liners, and marine-type connecting rods. |
| The two-stroke
cycle main propulsion engines on the harbor tug to which you are assigned
are fitted with turbochargers for scavenging purposes. Assume that you are
checking the air box drains in an installation that is valved with external
drain piping to a drains tank. When you open the air box drain valves, no
drainage occurs when in fact there is an accumulation of oil and moisture
on the floor of the air boxes. What should you do? |
Blow through the
drain openings with compressed air to clear the drains. |
Increase the crankcase
pressure to blow the air box drain openings clear. |
Increase the air
box pressure to blow the air box drain openings clear. |
Mechanically poke
through the drain openings with a rod to clear the drains. |
| The pneumatic
propulsion control system used on your towing vessel is configured as shown
in the illustration. In terms of clutch air system maintenance, what statement
best represents operational requirements? Illustration MP-IC-12 |
Whereas the cleanliness
of clutch air is critical, the dryness and pressure are clutch air are of
secondary concern. |
Whereas the dryness
of clutch air is critical, the pressure and cleanliness of the clutch air
are of secondary concern. |
Whereas the clutch
air pressure is critical, the dryness and cleanliness of the clutch air
are of secondary concern. |
The pressure,
dryness, and cleanliness of clutch air are all critical to successful pneumatic
propulsion control operations. |
| The river push
boat to which you are assigned has diesel generators fitted with intake
and exhaust systems as shown in the illustration. What does the component
labeled "2" represent? Illustration MP-IX-06 |
Exhaust manifold |
Wet muffler |
Charge air manifold |
Charge air cooler |
| The towing vessel
to which you are assigned is fitted with a pneumatic propulsion control
system as shown in the illustration. If propulsion control functions perfectly
from the engine room control station, but will not function at all from
any of the remote stations, which of the following system faults best accounts
for these symptoms? Illustration MP-IC-12 |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
The attendance
valve at the pneumatic remote control station has a blocked outlet port. |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
| The ocean-going
tug to which you are assigned is fitted with auxiliary engines as partly
shown in the illustration. What statement is true concerning the valve guide
and valve seat arrangements? Illustration MP-HS-03 |
The valve guides
are replaceable inserts, and the valve seats are integral (non-replaceable). |
The valve guides
are integral (non-replaceable), and the valve seats are replaceable inserts. |
The valve guides
and the valve seats are both integral (non-replaceable). |
The valve guides
and the valve seats are both replaceable inserts. |
| The ship-docking
tug to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If the astern clutch fails
to engage from the engine room control station, but engages properly from
all remote control stations, which of the following system faults best accounts
for these symptoms? Illustration MP-IC-12 |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
The astern clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
The control lever
at the engine room control station has a blocked astern clutch engagement
pilot port. |
The clutch actuator
4-way control valve at the clutch control panel has a restricted astern
clutch quick exhaust port opening. |
| Suppose the diesel
generator set drive engines are of the type shown in the illustration on
your ship docking tug. What description best represents the operating cycle
and aspiration method? Illustration MP-HS-07 |
Crankcase scavenged,
two-stroke cycle engine. |
Naturally aspirated,
two-stroke cycle engine |
Roots-blown, two-stroke
cycle engine. |
Roots-blown, four-stroke
cycle engine. |
| Suppose the main
propulsion diesel engines on your river pushboat are fitted with pressure-compensated
governors as shown in the illustration. What function does the engine lube
oil pressure connection provide? Illustration MP-GV-03 |
It is used as
a governor lubricant and as a hydraulic power medium for the power cylinder. |
It is used solely
for the purpose of achieving engine shutdown on low engine lube oil pressure. |
It is used solely
for the purpose of activating an alarm on low engine lube oil pressure. |
It is used for
both activating an alarm and achieving engine shutdown on low engine lube
oil pressure. |
| Suppose one of
the overhead camshafts on the V-type main propulsion diesel engines on your
tug are fitted on the forward end with the device shown in the illustration.
In addition to serving as a counterweight, what other function does the
device serve? Illustration MP-SF-06 |
Torsional vibration
damper |
Overspeed trip |
Overload sensor |
Harmonic balancer |
| Which tugboat
diesel fuel oil day tank condition would be most likely to result in water
contaminated fuel? |
Maintaining relatively
low day tank levels when the relative humidity of the atmosphere is low. |
Maintaining relatively
low day tank levels when the relative humidity of the atmosphere is high. |
Maintaining relatively
high day tank levels when the relative humidity of the atmosphere is high. |
Maintaining relatively
high day tank levels when the relative humidity of the atmosphere is low. |
| The main engines
on your harbor tug are equipped with over speed trip devices as shown in
the illustration. By what method is the engine shutdown on an over speed
condition? Illustration MP-IC- 15 |
A trip shaft cam
positions all the unit injectors plungers to the bottom of their respective
strokes, preventing plunger reciprocation, which results in engine shutdown. |
A solenoid valve
in the common fuel supply line to the unit injectors is closed, which results
in engine shutdown. |
A trip shaft cam
positions all the unit injectors plungers to the top of their respective
strokes, preventing plunger reciprocation, which results in engine shutdown. |
The fuel control
linkage controlling the unit injector racks goes to the no fuel position,
which results in engine shutdown. |
| For diesel engines,
such as those used for main propulsion and auxiliary power on river push
boats, while running at speed, how is the ignition of fuel within the cylinder
achieved? |
Ignition is achieved
by the heat of compression created by compressing intake/charge air within
the cylinder into a relatively small volume. |
Ignition is achieved
by intense heat by passing electric current through the element of a specially
designed glow plug. |
Ignition is achieved
by the heat of compression created by compressing the air/fuel mixture within
the cylinder into a relatively small volume. |
Ignition is achieved
by a high voltage electric spark induced across the gap of a specially designed
spark plug. |
| Suppose the diesel
generator set drive engines are of the type shown in the illustration on
your towing vessel. Assuming the engine is naturally aspirated, within an
individual cylinder in terms of piston stroke and position, under what circumstances
are the intake and exhaust valves both open? Illustration MP-HS-03 |
When the piston
is at bottom dead center (BDC) transitioning from the intake stroke to the
compression stroke. |
When the piston
is at top dead center (TDC) transitioning from the exhaust stroke to the
intake stroke. |
When the piston
is at bottom dead center (BDC) transitioning from the power stroke to the
exhaust stroke. |
When the piston
is at top dead center (TDC) transitioning from the compression stroke to
the power stroke. |
| The river push
boat to which you are assigned has a main propulsion engine of the type
shown in the illustration. In terms of piston action, operating cycle, and
piston type, what statement is true concerning this engine type? Illustration
MP-MS-03 |
This is a single-acting,
two-stroke cycle, crosshead piston type engine. |
This is a double-acting,
four-stroke cycle, opposed piston type engine. |
This is a single-acting,
two-stroke cycle, opposed piston type engine. |
This is a double-acting,
two-stroke cycle, crosshead piston type engine. |
| When checking
the crankcase oil level on a main propulsion engine on your ship-docking
tug while en-route to picking up the ship, what should be the oil level
as indicated on the dipstick? |
The level should
be below the ADD mark on the side of the dipstick marked with engine IDLE
and oil HOT. |
The level should
be between the FULL and ADD marks on the side of the dipstick marked with
engine IDLE and oil HOT. |
The actual level
is unimportant as long as it is visible on the dipstick when the engine
is running. |
The level should
be well above the FULL mark on the side of the dipstick marked with engine
IDLE and oil HOT. |
| The river push
boat to which you are assigned is fitted with generator engines as partly
shown in the illustration. What statement is true concerning the cylinders?
Illustration MP-HS-03 |
The cylinder liners
are of the jacketed type and are replaceable inserts. |
The cylinder liners
are of the dry type and are replaceable inserts. |
The cylinder liners
are of the wet type and are replaceable inserts. |
The cylinder walls
are integral (non-replaceable) to the cylinder block. |
| When checking
the crankcase oil level on an off-line diesel generator set engine on your
ship- docking tug, what should be the oil level as indicated on the dipstick? |
The level should
be between the FULL and ADD marks on the dipstick. |
The actual level
is unimportant as long as it is visible on the dipstick. |
The level should
be below the ADD mark on the dipstick. |
The level should
be well above the FULL mark on the dipstick. |
| The various auxiliary
diesel engines fitted on your harbor tug may employ a variety of different
cranking methods for engine starting. What type of cranking motor is shown
in the illustration? Illustration MP-SR-04 |
Air cranking motor |
Electric cranking
motor |
Gasoline engine
cranking motor |
Hydraulic cranking
motor |
| The main propulsion
engines onboard your tractor tug use a lubricating oil system as shown in
the illustration. What item number represents the lubricating oil filter?
Illustration MP-LO-07 |
2 |
5 |
10 |
12 |
| Which of the following
fuel systems is characterized by a complete absence of high-pressure fuel
lines? |
Unit injector
type system. |
Rotary plunger
type system. |
Common rail type
system. |
In-line multi-plunger
type system. |
| The harbor tug
to which you are assigned has a diesel engine fitted with a rotary plunger
distributor type pump. Which figure of the illustration represents the most
likely type of fuel injection equipment used? Illustration MP-FI-19 |
1 |
2 |
3 |
4 |
| The harbor tug
to which you are assigned has main engines fitted with open type combustion
chambers featuring direct injection. Of the listed figures below found in
the illustration, which figure represents the most likely type of injector
nozzle type? Illustration MP-FI-18 |
1 |
2 |
3 |
4 |
| The river push
boat to which you are assigned has diesel generators fitted with intake
and exhaust systems as shown in the illustration. What does the component
labeled "2" represent? Illustration MP-IX-06 |
Wet muffler |
Charge air manifold |
Charge air cooler |
Exhaust manifold |
| The sea-going
tug to which you are assigned has main engines fitted with intake and exhaust
systems as shown in the illustration. What statement is true concerning
the turbocharger charge air discharge arrangements? Illustration MP-IX-08 |
It is not possible
to determine the turbocharger charge air discharge arrangements in this
particular drawing. |
The left side
turbocharger discharges charge air to the left cylinder bank, and the right
side turbocharger discharges charge air to the right cylinder bank. |
The left side
turbocharger discharges charge air to the right cylinder bank, and the right
side turbocharger discharges charge air to the left cylinder bank. |
The left side
turbocharger discharges charge air to both cylinder banks, and the right
side turbocharger discharges charge air to both cylinder banks. |
| The fresh water
cooling systems serving the main engines of your towing vessel are of the
type shown in the illustration. What statement accurately describes the
characteristics of the fresh water cooling circuit? Illustration MP-CW-15 |
The fresh water
circuit is a vented system using an automotive type 2-way thermostatic control
valve for temperature control. |
The fresh water
circuit is a pressurized system using an automotive type 2-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a pressurized system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a vented system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
| The auxiliary
engines on the ocean-going tug to which you are assigned are fitted with
Roots- blowers as shown in the illustration. What statement is true concerning
the timing gears as shown in figure "A"? Illustration MP-CA-12 |
The timing gears
are straight cut and insure that the blower rotor lobes are properly spaced
apart with a close tolerance. |
The timing gears
are straight cut and insure that the blower is properly timed to the engine's
crankshaft. |
The timing gears
are helically cut and insure that the blower is properly timed to the engine's
crankshaft. |
The timing gears
are helically cut and insure that the blower rotor lobes are properly spaced
apart with a close tolerance. |
| The main engines
on your river towboat are fitted with speed control governors of the type
shown in the illustration. What technology is used to transmit the desired
speed setting from the navigational bridge to the final input signal to
the engine governor? Illustration MP-GV-03 |
Mechanical (cable
or chain). |
Electronic (variable
DC current). |
Pneumatic (variable
control air pressure). |
Hydraulic (variable
control oil pressure). |
| Suppose each of
the main propulsion engines on your harbor assist tug is equipped with a
variable speed governor equipped with a solenoid actuated shutdown device.
After a high temperature alarm, after continuing to rise, what is the most
likely engine high temperature condition that would initiate a safety trip
shutdown? |
High fuel temperature |
High jacket water
temperature |
High charge air
temperature |
High exhaust temperature |
| The heating boiler
on your harbor tug is of the type shown in the illustration. Which of the
following arrangements describe a boiler of this type? Illustration MP-SP-11 |
The boiler is
of the water-tube type and utilizes forced circulation. |
The boiler is
of the fire-tube type and utilizes natural circulation. |
The boiler is
of the fire-tube type and utilizes forced circulation. |
The boiler is
of the water-tube type and utilizes natural circulation. |
| If the water level
as indicated by the gauge glass of an auxiliary boiler is in question, it
should be blown down. Which of the following statements represents the proper
procedure for performing a gauge glass blow down? |
The gauge glass
should be blown down twice; first with the upper cut-out valve open and
then with the lower cut-out valve open. |
The gauge glass
should be blown down once with both the upper cut-out and lower cut-out
valves open simultaneously. |
The gauge glass
should be blown down once with the lower cut-out valve open. |
The gauge glass
should be blown down twice; first with the lower cut-out valve open and
then with the upper cut-out valve open. |
| According to the
illustrated diesel engine cooling water systems diagram, what fluid is the
high temperature central fresh water thermostat designed to maintain? Illustration
MO-0129 |
The jacket water
cooler inlet temperature. |
The main engine
jacket water inlet temperature. |
The main engine
jacket water outlet temperature. |
The jacket water
cooler outlet temperature. |
| The vessel to
which you are assigned has main diesel engines fitted with intake and exhaust
systems as shown in the illustration. If the main engine is running under
a heavy load at maximum rpm, which pressure would ordinarily be negative?
Illustration MP-IX-11 |
Exhaust discharge
to stack |
Exhaust receiver |
Air intake |
Air box |
| A loop-scavenged
engine utilizes the motion of its pistons and a turbo-charger to provide
scavenging air. Which of the listed mechanical designs prevents the air
under the pistons from being pumped back through the scavenge ports during
the piston power stroke? |
Positive pressure
from the blower. |
Masked intake
ports. |
Lower liner seals. |
Length of the
piston skirt. |
| The pneumatic
propulsion control system used on your vessel uses a diaphragm-operated
relay valve as shown in the illustration. Periodically, the valve is to
be disassembled for cleaning and inspection. What statement best describes
the proper method for servicing the in-line strainers? Illustration MO-0052 |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with low pressure compressed air. |
The strainers
should be cleaned and rinsed with a non-flammable solvent, then blown dry
with high pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with high pressure compressed air. |
The strainers
should be washed with soap and water and rinsed with fresh water, then blown
dry with low pressure compressed air. |
| The main engines
on your vessel are fitted with speed control governors based on the operating
principle shown in the illustration. What statement is true concerning the
illustrated pressure- compensated governor? Illustration MP-GV-18 |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted inward and the pilot valve plunger will be in
the raised position aligning the control port to the pressure port. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted to vertical and the pilot valve plunger will
be in the centered position blocking off the control port. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted to vertical and the pilot valve plunger can be
positioned in any position. |
With the speeder
spring compression force and the flyweight centrifugal force in equilibrium,
the flyweights are pivoted outward and the pilot valve plunger will be in
the lowered position aligning the control port to the drain port. |
| A diesel engine
overspeeds and fails to restart when cranked at normal speed. Which of the
following problems is the most likely cause for the engine failing to restart? |
Improper governor
operation due to excess oil pressure |
Damage to the
governor due to excessive speed |
Failure to reset
the overspeed trip |
Failure to reposition
the fuel rack |
| A main engine
speed control governor for one of your vessel's main propulsion engines
hunts, surges, or is sluggish to respond to load changes. Which of the following
governor oil conditions would be the greatest single source of governor
troubles? |
Wrong type of
oil (composition) |
Foamy oil (air
entrainment) |
Dirty oil (solid
contaminants) |
Wrong grade of
oil (viscosity) |
| The auxiliary
steam boiler on your vessel is equipped with a gauge glass for local level
indication. On which of the following auxiliary boiler types would this
gauge glass be attached to a flash chamber also known as a steam accumulator
or steam separator? |
Water-tube natural-circulation
steam boiler |
Fire-tube steam
boiler |
Electric steam
boiler |
Water-tube forced-circulation
steam boiler |
| The rate of heat
transfer in a waste-heat boiler can be increased by __________. |
operating the
boiler at less than normal water level |
increasing the
amount of excess air to the burners |
installing fins
on the firesides of water-tubes |
treating the boiler
water with chemical oxygen scavengers |
| On a vessel fitted
with a coil-type, forced-circulation, water-tube, oil-fired auxiliary boiler,
what is the most practical way of determining if the inside surface of the
coil is excessively scaled with hard scale deposits? |
Monitoring the
feed pump pressures. |
Performing a visual
inspection. |
Monitoring the
circulating pump pressures. |
Measuring the
coil inside diameter. |
| The vessel to
which you are assigned is gear-driven with one main propulsion diesel engine
and a fixed-pitch propeller. While underway, the main engine becomes disabled,
requiring your vessel to be towed back into port. If pressurized lubricating
oil is not available to the reduction gear shaft bearings, what must be
done during the towing operation? |
The reduction
gear input shaft must be prevented from rotating by means of engaging the
engine turning gear at the flywheel. |
The reduction
gear output shaft must be prevented from rotating by means of locking the
propeller shaft. |
The reduction
gear input shaft must be prevented from rotating my means of engaging the
propulsion clutch. |
The reduction
gear input and output shafts must be prevented from rotating by means of
blocking the gear teeth. |
| You suspect that
the diesel generator in service on your vessel has a low coolant level.
Assuming that the cooling water system is pressurized and has no sight glass
associated with the expansion tank, which of the following represents the
proper procedure for checking the coolant level? |
Shut down the
engine, and allow the engine to cool. With a rag, very slowly remove the
pressure cap to relieve the system pressure. With the cap removed, check
the coolant level. |
Allow the engine
to continue to run, but with the load removed. With a rag, very rapidly
remove the pressure cap to relieve the system pressure. With the cap removed,
check the coolant level. |
Shut down the
engine. With a rag, very rapidly remove the pressure cap to relieve the
system pressure. With the cap removed, check the coolant level. |
Allow the engine
to continue to run with a normal load. With a rag, very slowly remove the
pressure cap to relieve the system pressure. With the cap removed, check
the coolant level. |
| An auxiliary diesel
engine on your vessel has experienced a safety shutdown due to high lubricating
oil temperature. What is the appropriate response? |
Allow 2 hours
for the engine to cool down before attempting to inspect the engine and
correct the cause of the trip before attempting to restart the engine. |
Allow the engine
to cool off for two minutes, then restart and monitor the lubricating oil
temperature to verify the cause of the shutdown. |
Immediately perform
the engine inspections to determine the cause of the high oil temperature
safety shutdown. |
Immediately restart
the engine, and monitor the oil temperature to verify the cause of the shutdown. |
| The oil platform
supply vessel to which you are assigned is fitted with a pneumatic propulsion
control system as shown in the illustration. If the astern clutch fails
to engage from all control locations, but the ahead clutch properly engages
from all control locations, which of the following system faults best accounts
for these symptoms? Illustration MP-IC-12 |
The ahead clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
The astern clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
The control lever
at the pneumatic remote control station has a blocked astern clutch engagement
pilot port. |
The control lever
at the engine room control station has a blocked astern clutch engagement
pilot port. |
| According to the
manufacturer's recommendations for a main propulsion diesel engine on an
oil rig supply vessel where the fuel oil day tank is above the engine, the
maximum allowable pressure drop across the primary suction fuel filter element
is 1.5 psig. What would be the equivalent pressure drop in inches of mercury,
when the fuel oil day tank is below the engine? |
0.75" Hg |
1.5" Hg |
3.0" Hg |
6.0" Hg |
| While warming
up the main engines on your offshore utility vessel while tied up at your
own pier, one of the main engines suddenly sounds the low lube oil pressure
alarm. What is the appropriate initial response? |
Immediately shutdown
the engine, then investigate the cause for the low-pressure alarm. |
Reduce the load
and speed on the engine and continue to monitor the oil pressure. |
Monitor closely
oil pressures, temperatures, and levels while continuing to run the engine. |
Immediately add
make-up oil or service lube oil coolers, strainers, and filters, as appropriate. |
| Prior to starting
the main propulsion diesel engines fitted on your platform supply vessel,
the crankcase oil level must be checked. At what checked level would you
be required to add make-up oil? |
When the oil level
drops below the ADD mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
drops to between the ADD and FULL marks on the side of the dipstick marked
ENGINE STOPPED and OIL COLD. |
When the oil level
drops below the FULL mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
drops to where it is no longer visible on the side of the dipstick marked
ENGINE STOPPED and OIL COLD. |
| You are about
to perform valve stem to rocker arm clearance adjustments on an auxiliary
diesel engine onboard your offshore supply vessel. Which of the following
statements concerning hot and cold clearances is true? |
When comparing
hot and cold valve clearances, the hot clearance will always be less than
the cold clearance for a given valve application. |
When comparing
hot and cold valve clearances, it is not possible to predict the hot and
cold clearances relative to one another for a given valve application. |
When comparing
hot and cold valve clearances, the hot clearance will always be greater
than the cold clearance for a given valve application. |
When comparing
hot and cold valve clearances, the hot and cold valve clearances for a given
valve application will always be identical. |
| The drilling platform
supply vessel to which you are assigned has diesel generators fitted with
unit injectors of the type shown in the illustration. What statement is
true concerning the operation of unit injectors of this type? Illustration
MP-FI-10 |
Pressurization
of the fuel is accomplished by the mechanically operated rocker arm, and
the timing and metering of the fuel is accomplished by the electronically
controlled solenoid. |
Pressurization
of the fuel is accomplished by the electronically controlled solenoid, and
the timing and metering of the fuel is accomplished by the mechanically
operated rocker arm. |
Pressurization
and timing of the fuel is accomplished by the mechanically operated rocker
arm, and the metering of the fuel is accomplished by the electronically
controlled solenoid. |
Pressurization
and metering of the fuel is accomplished by the mechanically operated rocker
arm, and the timing of the fuel is accomplished by the electronically controlled
solenoid. |
| When starting
a deck winch drive engine in preparation for cargo handling operations,
what parameter must be checked FIRST upon start-up to avoid immediate engine
damage? |
Fuel oil supply
header pressure. |
Deck winch gear
oil pump discharge pressure. |
Cylinder jacket
water pump discharge pressure. |
Engine lubricating
oil supply header pressure. |
| The lube oil quality
management system used on your general purpose supply vessel requires on
board testing of lubricating oil to include testing for viscosity at the
same temperature consistently. In terms of viscosity test results, what
statement is true? |
An unusual drop
in viscosity indicates excessive oxidation of the lubricating oil OR excessive
dilution of the lubricating oil with diesel fuel oil OR BOTH. |
An unusual drop
in viscosity indicates excessive oxidation of the lubricating oil and an
unusual rise in viscosity indicates excessive dilution of the lubricating
oil with diesel fuel oil. |
An unusual drop
in viscosity indicates excessive dilution of the lubricating oil with diesel
fuel oil and an unusual rise in viscosity indicates excessive oxidation
of the lubricating oil. |
An unusual rise
in viscosity indicates excessive oxidation of the lubricating oil OR excessive
dilution of the lubricating oil with diesel fuel oil OR BOTH. |
| You are assigned
to an OSV fitted with main propulsion diesel engines operating on the cycle
represented in the polar timing diagram shown in the illustration. When
do the exhaust valves open and close respectively? Illustration MO-0084 |
The exhaust valves
open at 55o before bottom dead center on the power stroke. The exhaust valves
close at 85o after top dead center on the intake stroke. |
The exhaust valves
open at bottom dead center at the beginning of the exhaust stroke. The exhaust
valves close at top dead center at the end of the exhaust stroke. |
The exhaust valves
open at top dead center at the end of the exhaust stroke. The exhaust valves
close at bottom dead center at the beginning of the exhaust stroke. |
The exhaust valves
open at 85o after top dead center on the intake stroke. The exhaust valves
close at 55o before bottom dead center on the power stroke. |
| An engine that
runs rough may indicate a misfiring cylinder. Various techniques associated
with disabling the injectors sequentially, in turn, may be used to locate
the misfiring cylinder on auxiliary diesel engines of the size used on offshore
supply vessels. What type of fuel injectors are disabled for troubleshooting
purposes by loosening the high-pressure fuel injection line fitting at the
injector nozzle? |
Mechanically operated
unit injectors where each injection pump plunger and injection nozzle are
integrated into one self-contained unit. |
Mechanically operated
injection nozzles where each nozzle is supplied by a separately housed pressure/time
(PT) metering pump. |
Electronically
operated unit injectors where each injection pump plunger and injection
nozzle are integrated into one self-contained unit. |
Hydraulically
operated injection nozzles where each nozzle is supplied by separately housed
injection pump plungers in a multi-plunger pump. |
| Due to the questionable
mineral content of fresh water taken on from shore as a source of make-up
water for diesel engine closed, recirculating cooling water systems, besides
chemical treatment and coolant testing, what is the best line of defense
in minimizing cooling system problems? |
Maintaining cooling
water temperatures at higher than normal values. |
Increasing the
frequency of draining, flushing, and re-filling the system. |
Maintaining a
tight system and promptly repairing leaks. |
Maintaining cooling
water temperatures at lower than normal values. |
| You are preparing
to change the oil of the speed control governor on one of the main propulsion
diesel engines on your OSV. What statement is true concerning the draining
and flushing procedures? |
The governor oil
should be drained while the oil is hot and the governor should be flushed
with the lightest grade of the same type of oil. |
The governor oil
should be drained while the oil is hot and the governor should be flushed
with the heaviest grade of the same type of oil. |
The governor oil
should be drained while the oil is cold and the governor should be flushed
with the heaviest grade of the same type of oil. |
The governor oil
should be drained while the oil is cold and the governor should be flushed
with the lightest grade of the same type of oil. |
| The turbocharged,
four-stroke, main propulsion diesel engines on your offshore supply vessel
are protected with dry-type air intake filters. The engines are fitted with
dial-type restriction indicators measuring the pressure in the air duct
between the air intake filter and the turbocharger blower inlet. Under what
conditions should the air intake filters be evaluated using the restriction
indicators? |
The engine should
be running at rated RPM with no load (propulsion clutch disengaged). |
The engine should
be running at idle RPM with no load (propulsion clutch disengaged). |
The engine should
be running at rated RPM with full load (propulsion clutch engaged). |
The engine should
be running at idle RPM with minimal load (propulsion clutch engaged). |
| The fresh water
cooling systems serving the main engines of your offshore supply vessel
are of the type shown in the illustration. What statement accurately describes
the characteristics of the fresh water cooling circuit? Illustration MP-CW-15 |
The fresh water
circuit is a vented system using an automotive type 2-way thermostatic control
valve for temperature control. |
The fresh water
circuit is a pressurized system using an automotive type 2-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a pressurized system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a vented system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
| A main engine
speed control governor for one of your offshore supply vessel's main propulsion
engines hunts, surges, or is sluggish to respond to load changes. Which
of the following governor oil conditions would be the greatest single source
of governor troubles? |
Foamy oil (air
entrainment). |
Wrong grade of
oil (viscosity). |
Dirty oil (solid
contaminants). |
Wrong type of
oil (composition). |
| Your general-purpose
supply vessel is fitted with a coil-type, water-tube, and forced-circulation
auxiliary boiler. What statement best represents the conditions associated
with coil watersides inspection and cleaning? |
Coil watersides
are relatively easy to inspect AND mechanical cleaning with water jet or
wire brush is a practical and efficient method of scale removal. |
Coil watersides
are very difficult to inspect AND chemical cleaning with a suitable acid
is the only practical and efficient method of scale removal. |
Coil watersides
are relatively easy to inspect AND chemical cleaning with a suitable acid
is the only practical and efficient method of scale removal. |
Coil watersides
are very difficult to inspect AND mechanical cleaning with water jet or
wire brush is a practical and efficient method of scale removal. |
| After performing
repairs on the fuel injection system or governor of a main propulsion diesel
engine on your offshore platform supply vessel, what precaution should be
taken prior to starting the engine? |
Provisions should
be made to shut off the engine's lubricating oil supply to stop the engine
in case there is an overspeed on start-up. |
Provisions should
be made to shut off the engine's control electrical power supply to stop
the engine in case there is an overspeed on start-up. |
Provisions should
be made to shut off the engine's starting air supply to stop the engine
in case there is an overspeed on start-up. |
Provisions should
be made to shut off the engine's inlet air and/or fuel supply to stop the
engine in case there is an overspeed on start-up. |
| An engine that
emits black smoke through the stack may indicate a misfiring cylinder. Assume
that the auxiliary diesel engines on your oil platform supply vessel have
a fuel injection system that permits the injectors to be disabled for troubleshooting
purposes by loosening the high-pressure fuel injection line fitting at the
injector nozzle while the engine is running and noting the response of the
engine in terms emission of black smoke. Which of the following statements
is true? |
After disabling
the injector of a given cylinder, if the engine previously producing black
smoke now produces even denser black smoke, this indicates that the cylinder
associated with the disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the engine previously producing black
smoke now produces a clear stack, this indicates that the cylinder associated
with the disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the engine previously producing a clear
exhaust now produces black smoke, this indicates that the cylinder associated
with the disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the engine previously producing black
smoke continues to produce equally dense black smoke, this indicates that
the cylinder associated with the disabled injector is misfiring. |
| The main propulsion
diesel engines on your offshore supply vessel are fitted with mechanically
operated and controlled unit injectors. In order for the engine to run properly,
the injectors must be properly timed relative to the camshaft and properly
synchronized relative to the other injectors. In terms of timing and synchronization,
what statement is true? |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, but injector synchronization is achieved by adjusting the
control racks of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, and injector synchronization is also achieved by adjusting
the cam follower heights of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, and injector synchronization is also achieved by adjusting the
control racks of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, but injector synchronization is achieved by adjusting the cam follower
heights of the injectors to the proper setting. |
| The main propulsion
diesel engines fitted on your OSV are started with vane-type air-starting
motors. What statement concerning air-start motor lubricator maintenance
is true? (Assume a metal bowl fitted with a tubular sight glass.) |
The lubricator
reservoir bowl should be re-filled with clean oil when it becomes approximately
half full as shown in the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil when the level is no longer
visible in the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil as soon as the level drops
to the very upper part of the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil when it is estimated that
the bowl is completely empty. |
| The multi-purpose
supply vessel to which you are assigned has main engines fitted with injectors
similar to those shown in the illustration. What statement is true concerning
the operating principle of this type of injector? Illustration MP-FI-22 |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve closing forces. |
The fuel pressure
within the annulus is a needle valve closing force, the compression load
on the spring is a needle valve opening force. |
The fuel pressure
within the annulus is a needle valve opening force, the compression load
on the spring is a needle valve closing force. |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve opening forces. |
| You suspect that
a diesel generator set on your anchor-handling supply vessel has a misfiring
cylinder because the engine, although warm, is running roughly. The six-cylinder
engine is fitted with a multi-plunger in-line high pressure fuel injection
pump with hydraulically operated injector nozzles. When you slacken the
high pressure fuel line fitting at #5 fuel injector nozzle, the engine continues
to run roughly as before with no real change. Upon re-tightening the high
pressure fuel line fitting, the engine begins and continues to run smoothly.
What does this indicate? |
#5 cylinder was
and continues to be firing properly. #1, #2, #3, or #4 cylinder is misfiring.
# 6 cylinder is firing properly. |
#5 cylinder had
been misfiring. You have successfully purged the air from the #5 cylinder
high pressure fuel line, and the engine is no longer misfiring. |
#5 cylinder was
and continues to be firing properly. #6 cylinder is misfiring. #1, #2, #3,
and #4 cylinders are all firing properly. |
#5 cylinder was
and continues to be misfiring. You have successfully located the misfiring
cylinder. |
| The winch drive
engine on the anchor handling supply vessel to which you are assigned is
fitted with a Roots-type blower as shown in the illustration. What statement
is true concerning this blower? Illustration MP-CA-09 |
Rotor "1"
turns counter-clockwise, and rotor "2" turns clockwise. Area "3"
is the suction passage, and area "4" is the discharge passage. |
Rotor "1"
turns clockwise, and rotor "2" turns counter-clockwise. Area "3"
is the discharge passage, and area "4" is the suction passage. |
Rotor "1"
turns clockwise, and rotor "2" turns counter-clockwise. Area "3"
is the suction passage, and area "4" is the discharge passage. |
Rotor "1"
turns counter-clockwise, and rotor "2" turns clockwise. Area "3"
is the discharge passage, and area "4" is the suction passage. |
| You are assigned
as an engineer on an offshore platform supply vessel using main propulsion
engines of the type shown in the illustration. What statement represents
the procedure for inspection of the upper cylinder liner bore while in place
inside the engine? Illustration MP-MS-04 |
With the particular
piston positioned at TDC and the corresponding oil pan handhold cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at BDC and the corresponding air box handhold cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at TDC and the corresponding air box handhold cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at BDC and the corresponding oil pan handhold cover removed,
inspect the upper liner bore through the scavenging air ports. |
| The offshore supply
vessel to which you are assigned is fitted with reversing reduction gears
equipped with airflex pneumatic tire-type friction clutches. With the bridge
in control of the main engines, you hear unusual screeching noises coming
from the clutches, but only when transitioning from one direction to the
other. Given the situation of changing direction from ahead to astern as
an example, what is the most likely cause? |
The EOT handle
is being left in ahead idle and then in neutral for too long a period of
time. |
The EOT handle
is being left in neutral and then in astern idle for too short a period
of time. |
The EOT handle
is being left in ahead idle and then in neutral for too short a period of
time. |
The EOT handle
is being left in neutral and then in astern idle for too long a period of
time. |
| While underway
in open waters on your platform supply vessel, the low clutch air pressure
alarm sounds and the faint odor of burning rubber is detected. What is the
appropriate response? |
Reduce the load
and speed on the engine, then investigate the cause of low clutch air pressure. |
Investigate the
cause of low clutch air pressure, then reduce the engine load and speed
if necessary. |
Investigate the
cause of low clutch air pressure, then bring the throttle and clutch control
to the stop position if necessary. |
Bring the throttle
and clutch control to the stop position, then investigate the cause of low
clutch air pressure. |
| You are observing
the flame condition on an oil-fired auxiliary boiler installed on your anchor-handling
supply vessel through an observation window peephole. The flame is a reddish
color accompanied by a noticeably panting/pulsating furnace. What would
be the correlating color of the gases exhausting from the stack under these
conditions? |
Light brown haze |
White smoke |
Clear stack |
Dense black smoke |
| The turbochargers
on the main propulsion engines on the OSV to which you are assigned are
fitted with an exhaust inlet screen to protect the turbocharger turbine.
Upon inspection, pieces of broken piston rings or exhaust valves are found
in the foreign object trap box. Besides removing this debris, with respect
to the screen what should be done? |
The screen should
be placed in a press to remove any indentations from impingement. |
The screen should
be replaced without conducting any further checking or investigation. |
The screen should
be magnafluxed to check for damage not visible to the naked eye. |
The screen should
be replaced only when damage is obvious to the naked eye. |
| The main diesel
engines on the OSV to which you are assigned are fitted with a basket type
lube oil strainer, which must be periodically cleaned. The engine manufacturer
recommends using a petroleum based solvent for cleaning. Which of the following
would typically be acceptable? |
A high flash point
solvent such as kerosene or diesel fuel. |
A low flash point
solvent such as gasoline. |
An aromatic solvent
such as benzene or toluene. |
A chlorinated
solvent such as perchlorethylene or trichloroethylene. |
| The diesel fuels
burned in auxiliary and main diesel engines of offshore supply vessels serving
drilling platforms are required to meet certain specifications. Among these
are limits of certain contaminants to limit atmospheric emissions to acceptable
levels. Which of the following soluble contaminants is applicable? |
Total sediment |
Sulfur |
Water |
Asphaltenes |
| The offshore supply
vessel to which you are assigned has a pneumatic propulsion control system
as shown in the illustration. Which valve is responsible for processing
a clutch inflation pressure at speed signal pilot pressure during periods
of clutch slip maneuvering at low engine rpm? Illustration MP-IC-08 |
H5 governor limit
relay air valve |
H5 inflation air
relay valve |
H5 boost relay
air valve |
C2 speed-slip
relay valve |
| The OSV to which
you are assigned is fitted with a pneumatic propulsion control system as
shown in the illustration. All propulsion controls function properly from
all locations with the exception of the pneumatic remote control station.
Here the propulsion engine will run only at idle and neither propulsion
clutch will engage regardless of the throttle lever control position. Which
of the following system faults best accounts for these symptoms? Illustration
MP-IC-12 |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The attendance
valve at the pilothouse pneumatic master control station has a blocked outlet
port. |
The throttle lever
control at the pneumatic remote control station has a blocked speed signal
pilot air port. |
The pilot house/remote
transfer valve at the pilothouse pneumatic master control station has a
blocked remote port. |
| The oil spill
response vessel to which you are assigned is fitted with reduction gears
as shown in the illustration. What statement is true concerning this type
of reduction gear? Illustration MP-DS-04 |
The reduction
gear is a double-input, double-reduction type of gear. |
The reduction
gear is a single-input, single-reduction type of gear. |
The reduction
gear is a double-input, single-reduction type of gear. |
The reduction
gear is a single-input, double-reduction type of gear. |
| After a main diesel
engine on your oil platform construction support vessel has experienced
a safety shutdown due to excessive crankcase pressure, why is it important
to wait 2 hours before opening the crankcase to investigate the cause of
the trip? |
Opening the crankcase
before 2 hours has elapsed may result in the engine spontaneously restarting. |
Opening the crankcase
before 2 hours has elapsed may result in excessively rapid cooling. |
Opening the crankcase
before 2 hours has elapsed may result in a crankcase explosion. |
Opening the crankcase
before 2 hours has elapsed may result in crankshaft rotation. |
| You are serving
as a Chief Engineer (DDE) onboard an OSV equipped with main propulsion diesel
engines of the type represented by the polar timing diagram shown in the
illustration. What description best describes the engine type? Illustration
MO-0084 |
Turbocharged,
4-stroke cycle engine. |
Turbocharged,
2-stroke cycle engine. |
Naturally aspirated,
4-stroke cycle engine. |
Naturally aspirated,
2-stroke cycle engine. |
| The fresh water
cooling systems serving the main engines on your anchor-handling supply
boat are arranged as shown in the illustration. If the fresh water thermostatic
control valve fails in the position where 100% of the flow from flange "A"
is permanently ported to flange "C" and flange "B" is
permanently blocked, while starting and warming the engine with no load,
what would be the resulting warm up time period? Illustration MP-CW-15 |
With no load,
the engine would require a much longer than normal time frame to warm up. |
With no load,
the engine would require a relatively normal time frame to warm up. |
With no load,
it is not possible to describe the time frame required to warm up the engine. |
With no load,
the engine would require a much shorter than normal time frame to warm up. |
| The various auxiliary
diesel engines fitted on your anchor-handling vessel may employ a variety
of different cranking methods for engine starting. What type of cranking
method is shown in the illustration? Illustration MP-SR-04 |
Gasoline engine
cranking motor |
Electric cranking
motor |
Air cranking motor |
Hydraulic cranking
motor |
| The main engines
on the anchor-handling supply boat to which you are assigned are fitted
with duplex secondary spin-on fuel filters. Concerning the selector handle,
what statement is true? |
The selector handle
is normally placed in the "BOTH" position regardless of the load
or rpm on the engine in order to be able to double the fuel handling throughput
at any load or rpm and allow the engine speed to be changed without worrying
about the selector handle position. |
The selector handle
is placed in the "BOTH" position when the engine is running at
high load or rpm to accommodate higher fuel delivery requirements. When
the engine is running at low load or rpm, the selector handle is placed
in either the "1" or "2" position. |
The selector handle
is placed in either position the "1" or "2" position
regardless of the load or rpm on the engine. The selector handle is temporarily
placed in the "BOTH" position only when transitioning from a restricted
filter element over to a clean filter element. |
The selector handle
is placed in the "BOTH" position when the engine is running at
low load or rpm. When the engine is running at high load or rpm, the selector
handle is placed in either the "1" or "2" position depending
upon which filter element is clean. |
| The multi-purpose
offshore supply vessel to which you are assigned is fitted with main propulsion
diesel engines of the type shown in the illustration. In terms of valve
operating gear, cylinder liner type, and connecting rod type, what statement
is true? Illustration MP-MS-07 |
This is a pushrod
operated overhead valve engine, with wet cylinder liners and conventional
connecting rods. |
This is an overhead
cam engine, with jacketed cylinder liners and marine-type connecting rods. |
This is a pushrod
operated overhead valve engine, with jacketed cylinder liners and articulated
connecting rods. |
This is an overhead
cam engine, with wet cylinder liners and conventional connecting rods. |
| The steam generating
plant on your oil platform supply vessel is of the type shown in the illustration.
Which of the labeled components would be the steam separator? Illustration
MP-SP-20 |
1 |
2 |
3 |
5 |
| The two-stroke
cycle main propulsion engines on the supply boat to which you are assigned
are fitted with Roots-type blowers for scavenging purposes. Upon inspection
of the air boxes, what condition would indicate a need to replace the Roots-type
blower immediately? |
Water accumulations |
Iron dust residue |
Aluminum dust
residue |
Oil accumulations |
| The offshore oil
spill response vessel to which you are assigned is fitted with auxiliary
engines as partly shown in the illustration. What statement is true concerning
the valve guide and valve seat arrangements? Illustration MP-HS-03 |
The valve guides
are replaceable inserts, and the valve seats are integral (non-replaceable). |
The valve guides
and the valve seats are both integral (non-replaceable). |
The valve guides
are integral (non-replaceable), and the valve seats are replaceable inserts. |
The valve guides
and the valve seats are both replaceable inserts. |
| What statement
concerning fuel cetane rating and the ignition delay period is true as it
applies to offshore anchor handling vessel main propulsion diesel engines? |
The ignition delay
period is the lag in time between when fuel injection is initiated and when
fuel injection actually begins, and the higher the cetane rating of the
fuel the shorter the ignition delay period. |
The ignition delay
period is the lag in time between when fuel injection actually begins and
when combustion actually begins, and the higher the cetane rating of the
fuel the shorter the ignition delay period. |
The ignition delay
period is the lag in time between when fuel injection actually begins and
when combustion actually begins, and the higher the cetane rating of the
fuel the longer the ignition delay period. |
The ignition delay
period is the lag in time between when fuel injection is initiated and when
fuel injection actually begins, and the higher the cetane rating of the
fuel the longer the ignition delay period. |
| The offshore supply
vessel to which you are assigned has a main engine fuel system as shown
in the illustration. Besides preventing the attached fuel oil pump and the
hand priming fuel oil pump from discharging through the other, what other
purpose do the anti-flood check valves serve? Illustration MP-FO-06 |
They prevent backflow
of fuel from the engine to the day tank when the engine is shut down and
when the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shut down and
when the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located above the engine. |
| A diesel generator
set on your anchor-handling supply vessel has a simplex lube oil strainer
of the type shown in the illustration, situated on the discharge side of
the lube oil pump. At a specified engine rpm and lube oil temperature, you
notice that the inlet pressure is increasing and the outlet pressure is
decreasing, resulting in an unacceptable pressure drop. What should be done?
Illustration MO-0057 |
While the engine
is running, the drain plug (B) should be carefully loosened to drain the
sludge from the strainer sump. |
While the engine
is running, the cleaning handle (A) should be rotated one or more full turns
to remove the accumulated dirt from the disk stack (C). |
While the engine
is running, the cleaning handle (A) should be rotated one-half turn to remove
the accumulated dirt from the disk stack (C). |
The drain plug
(B) is removed to drain the sludge from the strainer sump, but the engine
must be stopped to perform this operation. |
| The deck winch
on your oil platform construction support vessel is fitted with a speed
control governor of the type shown in the illustration. In addition to variable
governed speed setting, what other group of settings is built into this
particular governor? Illustration MP-GV-10 |
Engine idle speed
(minimum governed speed) Engine speed limit (maximum governed speed) |
Engine load limit
(maximum fuel delivery) Engine speed limit (maximum governed speed) |
Engine idle speed
(minimum governed speed) Engine speed limit (maximum governed speed) Engine
load limit (maximum fuel delivery) |
Engine idle speed
(minimum governed speed) Engine load limit (maximum fuel delivery) |
| The platform supply
vessel to which you are assigned is fitted with auxiliary diesel engines
of the type shown in the illustration. In terms of valve operating gear
and cylinder liner type, what statement is true? Illustration MP-HS-07 |
This is an overhead
cam engine with dry cylinder liners. |
This is a pushrod
operated overhead valve engine with wet cylinder liners. |
This is an overhead
cam engine with wet cylinder liners. |
This is a pushrod
operated overhead valve engine with dry cylinder liners. |
| The auxiliary
steam boiler on your oil platform supply vessel is equipped with soot blowers
for maintaining heat transfer efficiency. On which of the following auxiliary
boiler types would soot blowers most likely be fitted? |
Fire-tube steam
boiler |
Electric steam
boiler |
Water-tube forced-circulation
steam boiler |
Water-tube natural-circulation
steam boiler |
| The main diesel
propulsion engines on your offshore supply vessel are protected with a mechanical
over speed trip mechanism similar to that shown in the illustration. Upon
testing the trip setting, you discover that it is necessary to make an adjustment.
Assuming that several adjustments may be necessary before the final setting
is accurately achieved, what statement concerning adjustment is true? Illustration
MO-0101 |
To adjust the
over speed trip, the engine must be stopped AND the locknut must be retightened
only after the final adjustment. |
To adjust the
over speed trip, the engine must be stopped AND the locknut must be retightened
after each adjustment. |
To adjust the
over speed trip, the engine must be running AND the locknut must be retightened
after each adjustment. |
To adjust the
over speed trip, the engine must be running AND the locknut must be retightened
only after the final adjustment. |
| The thermal fluid
heating oil system on your offshore supply vessel is configured similarly
to that shown in the illustration. What system component performs expansion
and dearation functions? Illustration MP-SP-23 |
1 |
2 |
4 |
5 |
| The diesel generator
set drive engines on your offshore supply boat are protected with heavy-duty
oil bath air cleaners. The oil within these air cleaners should be periodically
replaced in accordance with manufacturer recommendations. What statement
best describes when it would be appropriate to deviate from the recommended
frequency? |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
| Water-jacketed
exhaust manifolds as used on anchor-handling supply vessel main engines
require periodic inspection of the jackets and scale removal as necessary.
What would be the impact of a failure to remove scale deposits on a timely
basis? |
Excessive scale
deposits would increase heat transfer and raise the temperature of the inside
wall of the exhaust manifold. |
Excessive scale
deposits would decrease heat transfer and raise the temperature of the inside
wall of the exhaust manifold. |
Excessive scale
deposits would decrease heat transfer and lower the temperature of the inside
wall of the exhaust manifold. |
Excessive scale
deposits would increase heat transfer and lower the temperature of the inside
wall of the exhaust manifold. |
| When checking
the cylinder jacket water-cooling expansion tank level on a main propulsion
diesel engine on your offshore crew boat while underway, what should be
the expansion tank level? |
The level should
be in the upper part of the sight glass when the engine is at operating
temperature. |
The actual level
is unimportant as long as it is visible in the sight glass when the engine
is at operating temperature. |
The level should
be in the lower part of the sight glass when the engine is at operating
temperature. |
The level should
be out of sight high in the sight glass when the engine is at operating
temperature. |
| The main engines
on your multi-purpose supply vessel are equipped with over speed trip devices
as shown in the illustration. What statement concerning the operation of
the over speed trip is true? Illustration MP-IC-15 |
The over speed
trip senses oil pressure proportional to engine speed and shuts the engine
down at a pre-determined, specified maximum speed setting. |
The over speed
trip senses centrifugal force proportional to engine speed and limits the
engine speed to the rated speed, while allowing the engine to continue to
run at the rated speed. |
The over speed
trip senses centrifugal force proportional to engine speed and shuts the
engine down at a pre-determined, specified maximum speed setting. |
The over speed
trip senses oil pressure proportional to engine speed and limits the engine
speed to the rated speed, while allowing the engine to continue to run at
the rated speed. |
| The lubricating
oil system supporting the main propulsion reduction gear on the anchor-handling
supply vessel to which you are assigned is fitted with a lube oil strainer
as shown in the illustration. What strainer attribute will dictate the degree
of filtration in terms of the particle size capable of being filtered? Illustration
MO-0057 |
The length of
the oil sump enclosing the straining element. |
The number of
discs in the disc-stack making up the straining element. |
The dimensions
of the triangular oil passages in each disc conveying the strained oil upward. |
Vertical spacing
between the metal discs as determined by the thickness of the cleaner blades. |
| Various diesel
engines onboard your offshore supply vessel are started by means of either
vane- type or turbine air-starting motors. At a minimum, in the absence
of automatic drain valves, how often should moisture separators be drained
of moisture while the vessel is underway? |
Hourly |
Daily |
Weekly |
Monthly |
| Diesel engine
closed, recirculating cooling water systems are particularly prone to cavitation
corrosion/erosion. Which of the listed cooling system/engine components
has surfaces in contact with the coolant that are most susceptible to this
type of corrosion and erosion? |
Wet-type cylinder
liners. |
Engine exhaust
cooling water jackets. |
Cylinder cooling
water jackets. |
Cylinder head
cooling water passages. |
| Your platform
supply vessel is fitted with cooling water systems serving the main propulsion
diesel engines as shown in the illustration. Which heat exchanger/cooler
application and aspect would most likely require periodic mechanical cleaning
with a specially designed brush? Illustration MP-CW-15 |
The outside of
the tubes of the lube oil cooler. |
The inside of
the tubes of the lube oil cooler. |
The inside of
the tubes of the RW/FW heat exchanger. |
The outside of
the tubes of the RW/FW heat exchanger. |
| The platform supply
vessel to which you are assigned has a main engine fuel system as shown
in the illustration. When the filter and water separator as shown in the
day tank fill line are combined into one unit, what is this called? Illustration
MP-FO-06 |
An adsorption
type filter. |
A coalescing type
filter. |
An absorption
type filter. |
A strainer. |
| The main engines
on your anchor handling supply vessel are equipped with manual shutdown
levers as shown in the illustration. What statement concerning manual shutdown
is true? Illustration MP-IC-15 |
The manual shutdown
lever is operated by means of a remote pull cable and uses the governor
fuel control linkage to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of a remote pull cable and uses the over speed
trip mechanism to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of the emergency trip reset lever and uses the
governor fuel control linkage. |
The manual shutdown
lever is operated by means of the over speed trip reset lever and uses the
over speed trip mechanism to accomplish engine shutdown. |
| On diesel engines
used on a multi-purpose supply vessel, which type of injection system is
most likely to use sophisticated electronic controls for timing and metering? |
Rotary plunger
type pump |
In-line multi-plunger
pump |
Distributor type
pump |
Unit injector
type pump |
| The various auxiliary
diesel engines fitted on your offshore oil spill response vessel may employ
a variety of different starting systems. What type of starting system is
shown in the illustration? Illustration MP-SR-05 |
Gas engine power
operated system. |
Pneumatic power
operated system. |
Hydraulic power
operated system. |
Electric power
operated system. |
| The oil platform
supply vessel to which you are assigned is fitted with main propulsion engines
driving through pneumatic airflex clutches as shown in the illustration.
What statement is true concerning this type of clutch? Illustration MP-DS-11 |
The clutch is
an expanding type clutch and expands to engage against the clutch drum when
inflated. |
The clutch is
a constricting type clutch and constricts to engage against the clutch gland
when inflated. |
The clutch is
a constricting type clutch and constricts to engage against the clutch drum
when inflated. |
The clutch is
an expanding type clutch and expands to engage against the clutch gland
when inflated. |
| Prior to starting
a diesel generator set engine fitted on your anchor handling vessel, it
has been determined that the transfer of make-up oil is required. At what
checked level should you stop adding make-up oil? |
When the oil level
rises to a level well above the FULL mark on the dipstick. |
When the oil level
rises to the ADD mark on the dipstick. |
When the oil level
rises to the FULL mark on the dipstick. |
When the oil level
rises to the between the ADD and FULL marks on the dipstick. |
| The anchor-handling
vessel to which you are assigned is fitted with generator drive engines
of the type shown in the illustration. In terms of operating cycle and cylinder
configuration, what statement is true? Illustration MP-HS-03 |
This is a four-stroke
cycle, 60o V-type engine. |
This is a two-stroke
cycle, 90o V-type engine. |
This is a four-stroke
cycle, 90o V-type engine. |
This is a two-stroke
cycle, 60o V-type engine. |
| For diesel engines,
such as those used for main propulsion and auxiliary power on offshore supply
vessels, while running at speed, how is the ignition of fuel within the
cylinder achieved? |
Ignition is achieved
by the heat of compression created by compressing the air/fuel mixture within
the cylinder into a relatively small volume. |
Ignition is achieved
by the heat of compression created by compressing intake/charge air within
the cylinder into a relatively small volume. |
Ignition is achieved
by intense heat by passing electric current through the element of a specially
designed glow plug. |
Ignition is achieved
by a high voltage electric spark induced across the gap of a specially designed
spark plug. |
| The main diesel
engines on the OSV to which you are assigned are fitted with a metal-edge
duplex suction fuel strainer, where the elements must be periodically cleaned.
The engine manufacturer recommends using a petroleum based solvent for cleaning.
Which of the following would typically be acceptable? |
Benzene or toluene. |
White mineral
spirits. |
Kerosene or diesel
fuel. |
Perchlorethylene
or trichlorethylene. |
| The main propulsion
diesel engines on your anchor-handling supply vessel are fitted with conventional
hydraulically operated injector nozzles of the orifice type. When testing
an injector by performing a pop-test on an injector test stand, you observe
no leakage prior to reaching the popping pressure, the pressure holds at
just below the popping pressure, the actual popping pressure is within specification,
but the spray pattern is distorted. What maintenance is required? |
The injector nozzle
tip orifices must be reconditioned by cleaning or the tip replaced. |
The injector spindle
and nozzle holder bore must be reconditioned or replaced. |
The injector spring
compression must be readjusted or a broken spring replaced. |
The injector needle
valve and seat must be reconditioned or replaced. |
| You are assigned
to an uninspected fishing industry line vessel fitted with main propulsion
diesel engines operating on the cycle represented in the polar timing diagram
shown in the illustration. What events or effects are represented by "II", "III",
and "IV" respectively? Illustration MO-0037 |
"II"
represents the scavenging period where the scavenging air ports are uncovered. "III"
represents a pressure loss effect where the cylinder pressure is lowered
by exhaust blowdown. "IV" represents the exhaust period where
the exhaust valves are held open. |
"II"
represents the exhaust period where the exhaust valves are held open. "III"
represents a supercharging effect where the cylinder pressure is boosted
with the scavenging air blower. "IV" represents the scavenging
period where the scavenging air ports are uncovered. |
"II"
represents the exhaust period where the exhaust valves are held open. "III"
represents a pressure loss effect where the cylinder pressure is lowered
by exhaust blowdown. "IV" represents the scavenging period where
the scavenging air ports are uncovered. |
"II"
represents the scavenging period where the scavenging air ports are uncovered. "III"
represents a supercharging effect where the cylinder pressure is boosted
with the scavenging air blower. "IV" represents the exhaust period
where the exhaust valves are held open. |
| You are assigned
to a fishery research vessel fitted with main propulsion diesel engines
operating on the cycle represented in the polar timing diagram shown in
the illustration. When do the intake valves open and close respectively?
Illustration MO-0084 |
The intake valves
open at top dead center at the beginning of the intake stroke. The intake
valves close at bottom dead center at the end of the intake stroke. |
The intake valves
open at 45o after bottom dead center on the compression stroke. The intake
valves close at 75o before top dead center on the exhaust. |
The intake valves
open at 75o before top dead center on the exhaust stroke. The intake valves
close at 45o after bottom dead center on the compression stroke. |
The intake valves
open at bottom dead center at the end of the intake stroke. The intake valves
close at top dead center at the beginning of the intake stroke. |
| You are assigned
as an engineer on a fishing research vessel using main propulsion engines
of the type shown in the illustration. What statement represents the procedure
for inspection of the upper cylinder liner bore while in place inside the
engine? Illustration MO-0122 |
With the particular
piston positioned at BDC and the corresponding oil pan handhole cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at TDC and the corresponding oil pan handhole cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at TDC and the corresponding air box handhole cover removed,
inspect the upper liner bore through the scavenging air ports. |
With the particular
piston positioned at BDC and the corresponding air box handhole cover removed,
inspect the upper liner bore through the scavenging air ports. |
| You are assigned
as an engineer on a fishing industry factory ship using main propulsion
engines of the type shown in the illustration. Assuming that the piston
is properly positioned, what statement represents the procedure for inspection
of the compression rings while in place inside the engine? Illustration
MO-0122 |
It is not possible
to inspect the compression rings while in place inside the engine. |
The inspection
takes place by removing the appropriate air box handhole cover and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate cylinder head valve cover and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate oil pan cover and viewing through
the resulting opening. |
| You are analyzing
the data used for trend analysis for a two-stroke main propulsion diesel
engine on your fishing trawler. Although the engine has yet to experience
a safety shutdown on high crankcase pressure, over time the crankcase pressure
(which normally runs in a vacuum) has gradually become less negative. Which
of the following failures would most likely be responsible for this condition? |
Worn piston compression
rings |
Leaking crankcase
handhole cover |
Burned cylinder
exhaust valve |
Dribbling injector
needle valve |
| You are analyzing
the data used for trend analysis for one of the main propulsion diesel engines
on the fishery research vessel to which you are assigned. The cylinder exhaust
temperature of one of the cylinders is significantly lower than the others.
When analyzing compression and firing pressure data, however, the numbers
are within the normal range for this particular cylinder. What condition
would produce these results? |
Excessive carbon
build-up on exhaust pyrometer probe of affected cylinder. |
Leaking fuel injector
needle valve for affected cylinder. |
Leaking exhaust
valve on affected cylinder. |
Excessive carbon
build-up on air inlet ports or valves of affected cylinder. |
| Before shutting
down the main propulsion engines on a fishing industry factory ship, ideally
what should be accomplished FIRST? |
The engine should
be shut down immediately with no delay period, regardless of the engine
load. |
The engine should
be operated at rated load for several minutes, and then shut down. |
The engine should
be operated with the load removed from the engine for several minutes, then
shut down. |
The engine should
be operated at a steady, but substantial load for several minutes, and then
shut down. |
| Prior to starting
a main propulsion diesel engine fitted on your fishing trawler, it has been
determined that the transfer of make-up oil is required. At what checked
level should you stop adding make-up oil? |
When the oil level
rises to the between the ADD and FULL marks on the side of the dipstick
marked ENGINE STOPPED and OIL COLD. |
When the oil level
rises to the ADD mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
rises to the FULL mark on the side of the dipstick marked ENGINE STOPPED
and OIL COLD. |
When the oil level
rises to a level well above the FULL mark on the side of the dipstick marked
ENGINE STOPPED and OIL COLD. |
| Prior to starting
a diesel generator set engine fitted on your fishery research vessel, it
has been determined that the transfer of make-up oil is required. At what
checked level should you stop adding make-up oil? |
When the oil level
rises to the FULL mark on the dipstick. |
When the oil level
rises to the ADD mark on the dipstick. |
When the oil level
rises to a level well above the FULL mark on the dipstick. |
When the oil level
rises to the between the ADD and FULL marks on the dipstick. |
| When checking
the crankcase oil level on an off-line diesel generator set engine on your
uninspected fishing trawler, what should be the oil level as indicated on
the dipstick? |
The level should
be below the ADD mark on the dipstick. |
The level should
be well above the FULL mark on the dipstick. |
The actual level
is unimportant as long as it is visible on the dipstick. |
The level should
be between the FULL and ADD marks on the dipstick. |
| The uninspected
fishing trawler to which you are assigned is fitted with main propulsion
diesel engines of the type shown in the illustration. In terms of valve
operating gear, cylinder liner type, and connecting rod type, what statement
is true? Illustration MO-0005 |
This is a pushrod
operated overhead valve engine, with jacketed cylinder liners and articulated
connecting rods. |
This is an overhead
cam engine, with wet cylinder liners and conventional connecting rods. |
This is an overhead
cam engine, with jacketed cylinder liners and marine-type connecting rods. |
This is a pushrod
operated overhead valve engine, with wet cylinder liners and conventional
connecting rods. |
| The fishing industry
line vessel to which you are assigned is fitted with main propulsion diesel
engines of the type shown in the illustration. In terms of valve operating
gear, cylinder liner type, and connecting rod type, what statement is true?
Illustration MO-0122 |
This is an overhead
cam engine, with jacketed cylinder liners and hinged-strap, fork-and- blade
connecting rods. |
This is a pushrod
operated overhead valve engine, with wet cylinder liners and hinged-strap,
fork-and-blade connecting rods. |
This is a pushrod
operated overhead valve engine, with jacketed cylinder liners and conventional
connecting rods. |
This is an overhead
cam engine, with wet cylinder liners, and marine-type connecting rods. |
| The mollusc dredger
to which you are assigned is fitted with generator set drive engines as
shown in the illustration. What statement is true in terms of the combustion
chamber design? Illustration MO-0006 |
The engine uses
an open type combustion chamber with a flat fire-deck. |
The engine uses
turbulence chambers with a hemispherical fire-deck. |
The engine uses
pre-combustion chambers with a flat fire-deck. |
The engine uses
an open type combustion chamber with a hemispherical fire-deck. |
| The uninspected
fishing trawler to which you are assigned is fitted with auxiliary engines
as partly shown in the illustration. What statement is true concerning the
valve guide and valve seat arrangements? Illustration MO-0013 |
The valve guides
are replaceable inserts, and the valve seats are integral (non-replaceable). |
The valve guides
and the valve seats are both integral (non-replaceable). |
The valve guides
are integral (non-replaceable), and the valve seats are replaceable inserts. |
The valve guides
and the valve seats are both replaceable inserts. |
| The main propulsion
diesel engines fitted on your fishing industry factory ship are started
with compressed air using the system illustrated. What would be the FIRST
consequence of having the start solenoid valve energized open by depressing
the start button? Illustration MP-SR-08 |
The upper cranking
air motor drive pinion is engaged to the engine flywheel. |
The upper cranking
air motor drive pinion is disengaged from the engine flywheel. |
The lower cranking
air motor drive pinion is disengaged from the engine flywheel. |
The lower cranking
air motor drive pinion is engaged to the engine flywheel. |
| The various auxiliary
diesel engines fitted on your fishery research vessel may employ a variety
of different starting systems. What type of starting system is shown in
the illustration? Illustration MO-0049 |
Electric power
operated system. |
Pneumatic power
operated system. |
Gas engine power
operated system. |
Hydraulic power
operated system. |
| The main propulsion
engines onboard your uninspected fishing trawler use a lubricating oil filtration
scheme as shown in the illustration. What type of filtration system is illustrated?
Illustration MP-LO-14 |
Shunt filtration. |
Bypass filtration. |
Full-flow filtration. |
Sump filtration. |
| The main propulsion
engines onboard your oil fishing industry factory ship use a lubricating
oil filtration scheme as shown in the illustration. What type of filtration
system is illustrated? Illustration MP-LO-09 |
Full-flow filtration. |
Shunt filtration. |
Sump filtration. |
Bypass filtration. |
| The fishing industry
factory ship to which you are assigned has main engines fitted with intake
and exhaust systems as shown in the illustration. What type of turbo charging
configuration is used? Illustration MP-IX-14 |
two-stage turbo
charging. |
Pulse turbo charging. |
Constant pressure
turbo charging. |
Boost-controlled
turbo charging. |
| The fresh water
cooling systems serving the main engines of your uninspected fishing industry
vessel are of the type shown in the illustration. What statement accurately
describes the characteristics of the fresh water cooling circuit? Illustration
MP-CW-15 |
The fresh water
circuit is a pressurized system using an automotive type 2-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a pressurized system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a vented system using a stationary/marine type 3-way thermostatic
control valve for temperature control. |
The fresh water
circuit is a vented system using an automotive type 2-way thermostatic control
valve for temperature control. |
| The diesel generators
on the fishing industry seiner to which you are assigned are fitted with
a charge air system as shown in the illustration. What statement is true
concerning this type of charge air system? Illustration MP-CA-10 |
The scavenging
blower is a positive displacement type, and the actual displacement is directly
proportional to engine speed. |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is directly proportional to engine speed. |
The scavenging
blower is a positive displacement type, and the actual displacement is not
directly proportional to engine speed. |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is not directly proportional to engine speed. |
| The fishing industry
factory ship to which you are assigned is fitted with main propulsion engines
driving through pneumatic air flex clutches as shown in the illustration.
What statement is true concerning this type of clutch? Illustration MP-DS-11 |
The clutch is
a constricting type clutch and constricts to engage against the clutch drum
when inflated. |
The clutch is
an expanding type clutch and expands to engage against the clutch drum when
inflated. |
The clutch is
a constricting type clutch and constricts to engage against the clutch gland
when inflated. |
The clutch is
an expanding type clutch and expands to engage against the clutch gland
when inflated. |
| The mollusc dredger
to which you are assigned has a pneumatic propulsion control system as shown
in the illustration. What statement is true concerning transfer of control?
Illustration MP-IC-12 |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
mechanical slave remote control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
engine room control station or vice versa. |
The transfer valve
at the engine room control station is used to transfer control of propulsion
from the engine room control station to the pilot house pneumatic master
control station or vice versa. |
The transfer valve
at the pneumatic remote control station is used to transfer control of propulsion
from the pneumatic remote control station to the mechanical slave remote
control station or vice versa. |
| The fishing industry
factory ship to which you are assigned has a pneumatic propulsion control
system as shown in the illustration. Which control valve is responsible
for bypassing the inflation delay orifice to insure rapid and positive reversals
and to protect the clutches from excessive slip? Illustration MP-IC-08 |
H5 boost relay
air valve |
C2 speed-slip
relay valve |
H5 governor limit
relay air valve |
H5 inflation air
relay valve |
| The main engines
on your uninspected fishing trawler are equipped with over speed trip devices
as shown in the illustration. What statement concerning the operation of
the over speed trip is true? Illustration MP-IC-15 |
The over speed
trip senses oil pressure proportional to engine speed and shuts the engine
down at a pre-determined, specified maximum speed setting. |
The over speed
trip senses centrifugal force proportional to engine speed and limits the
engine speed to the rated speed, while allowing the engine to continue to
run at the rated speed. |
The over speed
trip senses centrifugal force proportional to engine speed and shuts the
engine down at a pre-determined, specified maximum speed setting. |
The over speed
trip senses oil pressure proportional to engine speed and limits the engine
speed to the rated speed, while allowing the engine to continue to run at
the rated speed. |
| The main engines
on your fishing industry factory ship are fitted with speed control governors
of the type shown in the illustration. If the shutdown solenoid is de-energized
during normal operation, which of the following scenarios depicts the response
on a safety shutdown where the shutdown plunger rod moves downward unseating
the ball check valve when the shutdown solenoid energizes? Illustration
MP-IC-14 |
The servo piston
rod moves downward. The power cylinder tail rod moves upward. |
The servo piston
rod moves upward. The power cylinder tail rod moves upward. |
The servo piston
rod moves downward. The power cylinder tail rod moves downward. |
The servo piston
rod moves upward. The power cylinder tail rod moves downward. |
| The diesel generators
on your uninspected fishing trawler are fitted with speed control governors
of the type shown in the illustration. If an adjustment is made to item
#2, what will change? Illustration MP-GV-28 |
The maximum high-speed
setting. |
The minimum low
speed setting. |
The governed speed
setting. |
The speed droop
setting. |
| An engine that
runs rough may indicate a misfiring cylinder. Assume that the auxiliary
diesel engines on your fishery research vessel have a fuel injection system
that permits the injectors to be disabled for troubleshooting purposes by
loosening the high pressure fuel injection line fitting at the injector
nozzle while the the engine is running and noting the engine response. Which
of the following statements is true? |
After disabling
the injector of a given cylinder, if the previously rough-running engine
continues to run equally roughly with no change, this indicates that the
cylinder associated with the disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the previously rough-running engine
runs even rougher with considerable change, this indicates that the cylinder
associated with the disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the previously rough-running engine
now runs smoothly, this indicates that the cylinder associated with the
disabled injector is misfiring. |
After disabling
the injector of a given cylinder, if the previously smooth-running engine
runs rough with considerable change, this indicates that the cylinder associated
with the disabled injector is misfiring. |
| The main propulsion
diesel engines fitted on your uninspected fishing industry vessel are started
with vane-type air-starting motors. What statement concerning air-start
motor lubricator maintenance is true? (Assume a metal bowl fitted with a
tubular sight glass.) |
The lubricator
reservoir bowl should be re-filled with clean oil when the level is no longer
visible in the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil as soon as the level drops
to the upper part of the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil when it is estimated that
the bowl is completely empty. |
The lubricator
reservoir bowl should be re-filled with clean oil when it becomes approximately
half-full as shown in the glass. |
| An auxiliary diesel
engine on your fishing trawler uses a starting system similar to the one
shown in the illustration. The hand pump is capable of charging the accumulator
to the pressure necessary to start the engine and the engine successfully
starts. While running, the engine driven pump is not capable of maintaining
the accumulator in a state of being fully charged. Which of the following
is most likely to be the cause? Illustration MO-0049 |
The unloading
valve (I) is set for too high a pressure. |
The engine driven
pump (H) drive belt is broken. |
The full-flow
filter (G) is bypassing the element. |
The hydro starter
(C) pistons are worn. |
| A diesel generator
set on your fishing industry factory ship has a simplex lube oil strainer
of the type shown in the illustration, situated on the discharge side of
the lube oil pump. At a specified engine rpm and lube oil temperature, you
notice that the inlet pressure is increasing and the outlet pressure is
decreasing, resulting in an unacceptable pressure drop. What should be done?
Illustration MO-0057 |
While the engine
is running, the cleaning handle (A) should be rotated one or more full turns
to remove the accumulated dirt from the disk stack (C). |
While the engine
is running, the cleaning handle (A) should be rotated one-half turn to remove
the accumulated dirt from the disk stack (C). |
The drain plug
(B) is removed to drain the sludge from the strainer sump, but the engine
must be stopped to perform this operation. |
While the engine
is running, the drain plug (B) should be carefully loosened to drain the
sludge from the strainer sump. |
| A diesel generator
set on your fishing trawler has a simplex lube oil strainer of the type
shown in the illustration, situated on the discharge side of the lube oil
pump. At a specified engine rpm and lube oil temperature, you notice that
the pressure drop becomes unacceptably high. When you rotate the cleaning
handle, you notice that it is extremely difficult to rotate. What should
be done? Illustration MO-0057 |
After stopping
the engine, the drain plug (B) should be removed to drain the accumulated
sludge from the strainer sump. |
After stopping
the engine, the strainer element should be withdrawn and soaked in solvent
to break up the heavy deposits on the disk stack (C). |
The cleaning handle
(A) should be forced to rotate, even if it requires an extender handle to
produce greater rotating torque. |
No special consideration
need be taken as long as the cleaning handle (A) rotates, even if it rotates
with great difficulty. |
| When interpreting
the engine lube oil supply header pressures for the main engines on your
fishing trawler, what statement is true assuming that the lube oil pump
is engine-driven? |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to increase. |
As the lube oil
temperature increases, the supply header pressure tends to decrease, and
as the engine rpm increases, the supply header pressure tends to decrease. |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to decrease. |
As the lube oil
temperature increases, the supply header pressure tends to increase, and
as the engine rpm increases, the supply header pressure tends to increase. |
| The main engines
on the fishing factory ship to which you are assigned are fitted with duplex
secondary spin-on fuel filters. Concerning the selector handle, what statement
is true? |
The selector handle
is placed in the "BOTH" position when the engine is running at
low load or rpm. When the engine is running at high load or rpm, the selector
handle is placed in either the "1" or the “2" position depending
upon which filter element is clean. |
The selector handle
is placed in the "BOTH" position when the engine is running at
high load or rpm to accommodate higher fuel delivery requirements. When
the engine is running at low load or rpm, the selector handle is placed
in either the "1" or the “2" position. |
The selector handle
is placed in either position the "1" or "2" position
regardless of the load or rpm on the engine. The selector handle is temporarily
placed in the "BOTH" position only when transitioning from a restricted
filter element over to a clean filter element. |
The selector handle
is normally placed in the "BOTH" position regardless of the load
or rpm on the engine in order to be able to double the fuel handling throughput
at any load or rpm and allow the engine speed to be changed without worrying
about the selector handle position. |
| Which fishing
vessel diesel fuel oil day tank condition would be most likely to result
in water contaminated fuel? |
Maintaining relatively
low day tank levels when the relative humidity of the atmosphere is low. |
Maintaining relatively
low day tank levels when the relative humidity of the atmosphere is high. |
Maintaining relatively
high day tank levels when the relative humidity of the atmosphere is low. |
Maintaining relatively
high day tank levels when the relative humidity of the atmosphere is high. |
| The uninspected
fishing vessel to which you are assigned has a deck winch drive engine fitted
with fuel injectors with the operating principle as shown in the illustration.
In figure "A”, which plunger travel position corresponds to when fuel
injection ends? Illustration MP-FI-12 |
1 |
2 |
3 |
4 |
| The mollusc dredger
to which you are assigned has a deck winch drive engine fitted with fuel
injectors with the operating principle as shown in the illustration. In
figure "A”, which plunger travel position corresponds to when fuel
injection begins? Illustration MP-FI-12 |
1 |
2 |
3 |
4 |
| The fishery research
vessel to which you are assigned has diesel generators fitted with fuel
injectors of the type shown in figure "2" of the illustration.
What statement is true concerning this type of injector? Illustration MP-FI-20 |
The injector is
of the closed type and features pressure-time metering. |
The injector is
of the open type and features pressure-time metering. |
The injector is
of the closed type and features port and helix metering. |
The injector is
of the open type and features port and helix metering. |
| The main propulsion
diesel engines on your uninspected fishing industry vessel are fitted with
mechanically operated and controlled unit injectors. In order for the engine
to run properly, the injectors must be properly timed relative to the camshaft
and properly synchronized relative to the other injectors. In terms of timing
and synchronization, what statement is true? |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, and injector synchronization is also achieved by adjusting the
control racks of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the control racks of the injectors to the proper
setting, but injector synchronization is achieved by adjusting the cam follower
heights of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, but injector synchronization is achieved by adjusting the
control racks of the injectors to the proper setting. |
Injector timing
is achieved by adjusting the cam follower heights of the injectors to the
proper setting, and injector synchronization is also achieved by adjusting
the cam follower heights of the injectors to the proper setting. |
| The diesel generator
set drive engines on your fishing factory ship are protected with heavy-duty
oil bath air cleaners. The oil within these air cleaners should be periodically
replaced in accordance with manufacturer recommendations. What statement
best describes when it would be appropriate to deviate from the recommended
frequency? |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
| The diesel engines
on your fishing factory ship are all protected with dry-type air filters.
When changing filter elements what visual indication would cause you to
suspect that the engine has been contaminated with dust as the result of
improperly sealing of the filter element gasket? |
The "clean"
side of the air filter element is clean and free of dust. |
The "clean"
side of the air filter element is streaked with dust. |
The "dirty"
side of the air filter housing is coated with dust. |
The "dirty"
side of the air filter element is coated with dust. |
| A main propulsion
diesel engine on your fishing trawler produces gray to black smoke under
virtually all load conditions as observed at the stack. The heavier the
load on the engine, the darker the smoke becomes. What condition would most
likely account for this? |
Leaking exhaust
manifold cooling water jackets. |
Excessively restricted
exhaust silencer/muffler. |
Excessively worn
exhaust valve guides. |
Leaking exhaust
piping expansion joints. |
| Your fishing factory
ship is fitted with cooling water systems serving the main propulsion diesel
engines as shown in the illustration. Which heat exchanger/cooler application
and aspect would most likely require periodic mechanical cleaning with a
specially designed brush? Illustration MP-CW-15 |
The inside of
the tubes of the RW/FW heat exchanger. |
The outside of
the tubes of the RW/FW heat exchanger. |
The inside of
the tubes of the lube oil cooler. |
The outside of
the tubes of the lube oil cooler. |
| The fresh water
cooling systems serving the main engines on your fishery research vessel
are arranged as shown in the illustration. If the fresh water thermostatic
control valve fails in the position where 100% of the flow from flange "A"
is permanently ported to flange "C" and flange "B" is
permanently blocked, while starting and warming the engine with no load,
what would be the resulting warm up time period? Illustration MP-CW-15 |
With no load,
it is not possible to describe the time frame required to warm up the engine. |
With no load,
the engine would require a much shorter than normal time frame to warm up. |
With no load,
the engine would require a relatively normal time frame to warm up. |
With no load,
the engine would require a much longer than normal time frame to warm up. |
| The fresh water
cooling systems serving the main engines on your fishing factory ship are
arranged as shown in the illustration. If the coolant drain valves are inadvertently
opened during engine operation, what combination set of symptoms would most
likely result? Illustration MP-CW-16 |
Low level in the
jacket water expansion tank. High fresh water outlet temperature from the
engine. High fresh water pump(s) discharge pressure. |
Low level in the
jacket water expansion tank. High fresh water outlet temperature from the
engine. Low fresh water pump(s) discharge pressure. |
Low level in the
jacket water expansion tank. Low fresh water outlet temperature from the
engine. Low fresh water pump(s) discharge pressure. |
High level in
the jacket water expansion tank. High fresh water outlet temperature from
the engine. High fresh water pump(s) discharge pressure. |
| The turbochargers
on the main propulsion engines on the fishing factory ship to which you
are assigned are fitted with an exhaust inlet screen to protect the turbocharger
turbine. Upon inspection, pieces of broken piston rings or exhaust valves
are found in the foreign object trap box. Why is it essential that this
debris be removed prior to placing the engine back into operation? |
The debris may
eventually break into smaller pieces allowing turbine foreign object damage. |
The debris will
eventually become difficult to remove from the trap box. |
The debris may
eventually cause the screen to become severely restricted. |
The debris will
cause the turbine casing to become statically imbalanced. |
| The fishing trawler
to which you are assigned is fitted with hydraulic clutches similar to that
shown in the illustration. If the time required for the clutch to disengage
is unacceptably long, which of the following conditions would most likely
be responsible for this? Illustration MO-0089 |
Fluid clutch sump
level maintained at too high a level. |
Clutch operating
fluid is maintained at too high a temperature. |
Solid contaminants
are present in the hydraulic fluid. |
Clutch operating
fluid is maintained at too low a temperature. |
| The pneumatic
propulsion control system used on your uninspected fishing industry vessel
is configured as shown in the illustration. In terms of clutch air system
maintenance, what statement best represents operational requirements? Illustration
MP-IC-12 |
Whereas the clutch
air pressure is critical, the dryness and cleanliness of the clutch air
are of secondary concern. |
Whereas the cleanliness
of clutch air is critical, the dryness and pressure are clutch air are of
secondary concern. |
Whereas the dryness
of clutch air is critical, the pressure and cleanliness of the clutch air
are of secondary concern. |
The pressure,
dryness, and cleanliness of clutch air are all critical to successful pneumatic
propulsion control operations. |
| The uninspected
fishing industry vessel to which you are assigned is fitted with a pneumatic
propulsion control system as shown in the illustration. If propulsion control
functions perfectly from the engine room control station, but will not function
at all from any of the remote stations, which of the following system faults
best accounts for these symptoms? Illustration MP-IC-12 |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The attendance
valve at the pneumatic remote control station has a blocked outlet port. |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
| The main engines
on your fishing trawler are protected with a low crankcase oil level detector
protective device designed to provide an alarm when the main sump oil level
drops below a certain level. It is malfunctioning, and upon investigation,
you determine from the technical manual that the oil level detector is a
sealed unit. What statement best represents the best strategy to remedy
this situation? |
The oil level
detector is adjusted just as if it was an unsealed unit, without regard
to any seals associated with the unit. |
The oil level
detector is adjusted just as if it was an unsealed unit, but the seals must
be re- established before placing the unit back into operation. |
The oil level
detector seals must be broken before adjustments can be made, as long as
new seals are established before placing the unit back into operation. |
The oil level
detector must be replaced with a new detector if it is found to be defective,
since field adjustments are not possible on this type of unit. |
| A main propulsion
diesel engine on your fishing factory ship has experienced a safety shutdown
on high crankcase pressure that was accompanied by an alarm. After waiting
2 hours as recommended by the manufacturer, the crankcase is opened up and
suitable repairs are accomplished. After re- closing the crankcase, the
engine fails to start. Which of the following would account for this? |
The high crankcase
pressure detector protective device must have its diaphragm replaced first
before the engine can be restarted. |
The high crankcase
pressure detector protective device's pressure chamber must be evacuated
with a vacuum pump first before the engine can be restarted. |
The high crankcase
pressure detector protective device must be reset first before the engine
can be restarted. |
The high crankcase
pressure detector protective device must have its switch lever replaced
first before the engine can be restarted. |
| A main engine
on your fishing trawler has experienced a low coolant water level alarm
even though the water level in the expansion tank is normal. Assuming that
the float activated switch is designed to open at low coolant level to activate
the alarm, which of the following would account for this? |
The float level
switch contacts are welded closed, not permitting the contacts to open. |
The float switch
wire connections are loose at the terminals, not permitting continuity through
the switch. |
The float is binding
in the float chamber, not permitting the float to drop. |
It is not possible
for a low coolant level alarm to occur when the water level is normal. |
| Using the oil
chart provided in the illustration for guidance, which synthetic oil would
be capable of providing adequate lubrication of the main engine speed control
governor on your uninspected fishing industry vessel, if the governor oil
operating temperature shall be in the ideal operating range of 130°F to
205°F? Illustration MP-GV-35 |
Mobil 1 (Synthesized
Hydrocarbon). |
DN600 (Hydrocarbon). |
Amsoil 10W40 (Diester). |
All Proof 10W50
(Polyester). |
| The diesel generator
on service on your fishing factory ship is undergoing cyclic, rhythmic variations
in speed at steady load. When the governor output shaft is disconnected
from the fuel control linkage and the linkage is blocked manually, these
variations in engine speed stop. What would be an appropriate corrective
action? |
Tighten the bolts
securing the governor base to the engine. |
Replace the fuel
injector nozzle of the misfiring cylinder. |
Make an adjustment
at the compensating needle valve. |
Replace the governor
drive gears. |
| While warming
up the main engines on your uninspected fishing trawler while tied up at
your own pier, one of the main engines suddenly sounds the low lube oil
pressure alarm. What is the appropriate initial response? |
Immediately add
make-up oil or service lube oil coolers, strainers, and filters, as appropriate. |
Monitor closely
oil pressures, temperatures, and levels while continuing to run the engine. |
Reduce the load
and speed on the engine and continue to monitor the oil pressure. |
Immediately shutdown
the engine, then investigate the cause for the low-pressure alarm. |
| The fishery research
vessel to which you are assigned has a main engine fuel system as shown
in the illustration. Besides preventing the attached fuel oil pump and the
hand priming fuel oil pump from discharging through the other, what other
purpose do the anti-flood check valves serve? Illustration MP-FO-06 |
They prevent backflow
of fuel from the engine to the day tank when the engine is shutdown and
when the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shutdown and
when the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located above the engine. |
| The fresh water
cooling systems serving the main engines on your fishery research vessel
are arranged as shown in the illustration. If the fresh water thermostatic
control valve fails in the position where 100% of the flow from flange "A"
is permanently ported to flange "C" and flange "B" is
permanently blocked, while starting and warming the engine with no load,
what would be the resulting warm up time? Illustration MP-CW-15 |
With no load,
it is not possible to describe the time frame required to warm up the engine. |
With no load,
the engine would require a much shorter than normal time frame to warm up. |
With no load,
the engine would require a relatively normal time frame to warm up. |
With no load,
the engine would require a much longer than normal time frame to warm up. |
| The lubricating
oil system supporting the main propulsion reduction gear on the fishing
trawler to which you are assigned is fitted with a sea water-cooled 4-pass
shell and tube lube oil cooler. The water box sacrificial zinc anodes must
be inspected periodically. Which of the following listed actions correctly
states maintenance criteria pertaining to scale build-up on the zincs? |
Any accumulated
scale build-up on sacrificial zinc anodes should be scraped off until the
zinc anodes are shiny. |
Any accumulated
scale build-up on sacrificial zinc anodes should be left intact to ensure
proper protection from galvanic corrosion. |
Any sacrificial
zinc anodes with accumulated scale build-up should be replaced regardless
of the degree of deterioration. |
There is no need
to check for scale build-up on the sacrificial zinc anodes, as this phenomenon
is not physically possible. |
| The closed, recirculating
system coolant in the main engines used on your fishing industry factory
ship consists of heavy-duty antifreeze and supplemental coolant additive.
The coolant has been tested and the antifreeze, molybdate, and nitrite concentrations
are all within acceptable limits and the pH is also within acceptable limits.
According to the test-strip comparison chart shown in the illustration,
which set of indications corresponds with this? Illustration MP-WC-12 |
Antifreeze concentration
color indication: 30% Molybdate concentration color indication: row 1 Nitrite
concentration color indication: column B pH color indication: 8 |
Antifreeze concentration
color indication: 60% Molybdate concentration color indication: row 4 Nitrite
concentration color indication: column H pH color indication: 10 |
Antifreeze concentration
color indication: 50% Molybdate concentration color indication: row 3 Nitrite
concentration color indication: column E pH color indication: 9 |
Antifreeze concentration
color indication: 50% Molybdate concentration color indication: row 3 Nitrite
concentration color indication: column D pH color indication: 6 |
| After performing
repairs on the fuel injection system or governor of a main propulsion diesel
engine on your fishing industry factory ship, what precaution should be
taken prior to starting the engine? |
Provisions should
be made to shut off the engine's starting air supply to stop the engine
in case there is an over speed on start-up. |
Provisions should
be made to shut off the engine's lubricating oil supply to stop the engine
in case there is an over speed on start-up. |
Provisions should
be made to shut off the engine's inlet air and/or fuel supply to stop the
engine in case there is an over speed on start-up. |
Provisions should
be made to shut off the engine's control electrical power supply to stop
the engine in case there is an over speed on start-up. |
| The main engines
on your fishing industry factory ship are fitted with speed control governors
of the type shown in the illustration. What is the purpose of the compensation
system, consisting of the buffer cylinder, buffer piston, buffer springs,
and compensation needle valve? Illustration MP-GV-14 |
It limits engine
speed to a maximum value to prevent over speeding. |
It senses the
engine speed setting delivered from the bridge. |
It prevents engine
hunting when responding to load changes. |
It senses the
actual engine speed of rotation. |
| Using the oil
chart provided in the illustration for guidance, which synthetic oil would
be capable of providing adequate lubrication of the main engine speed control
governor on your uninspected fishing industry vessel, if the governor oil
operating temperature shall be in the ideal operating range of 130°F to
205°F? Illustration MP-GV-35 |
Mobil 1 (Synthesized
Hydrocarbon). |
DN600 (Hydrocarbon). |
Amsoil 10W40 (Diester). |
All Proof 10W50
(Polyester). |
| The steam generating
plant on your fishing industry factory ship is of the type shown in the
illustration. Which of the labeled components would be the steam separator?
Illustration MP-SP-20 |
1 |
2 |
3 |
5 |
| In a diesel engine,
which type of wrist is fixed to the small end of the connecting rod and
moves in the piston? |
Semi-floating |
Full floating |
Solid |
Fixed |
| The vessel to
which you are assigned is fitted with a 4-stroke cycle, 6-cylinder in-line
diesel generator sets. Using the chart shown in the illustration, what is
the firing order of the engines? Illustration MP-HS-05 |
1-2-3-4-5-6 |
1-4-2-6-3-5 |
1-5-3-6-2-4 |
Not enough information
is provided to determine the firing order. |
| The unit of measure
expressed as centistokes (cSt) is a measure of what fuel property? |
Heating value |
Cetane rating |
Viscosity |
Density |
| The vessel to
which you are assigned is fitted with auxiliary engines as shown in the
illustration. What statement is true concerning the valve guide and valve
seat arrangements? Illustration MP- HS-03 |
The valve guides
and the valve seats are both replaceable inserts. |
The valve guides
and the valve seats are both integral (non-replaceable). |
The valve guides
are integral (non-replaceable), and the valve seats are replaceable inserts. |
The valve guides
are replaceable inserts, and the valve seats are integral (non-replaceable). |
| The vessel to
which you are assigned is fitted with a diesel driven generator engine as
shown in the illustration. What statement is true in terms of the combustion
chamber design? Illustration MP-HS- 04 |
The engine uses
turbulence chambers with a hemispherical fire-deck. |
The engine uses
an open type combustion chamber with a hemispherical fire-deck. |
The engine uses
an open type combustion chamber with a flat fire-deck. |
The engine uses
pre-combustion chambers with a flat fire-deck. |
| When starting
an auxiliary diesel engine in preparation for operation, what parameter
must be checked FIRST upon start-up to avoid immediate engine damage? |
Fuel oil supply
header pressure. |
Cylinder jacket
water pump discharge pressure. |
Winch gear oil
pump discharge pressure. |
Engine lubricating
oil supply header pressure. |
| The diesel generator
set drive engines on your vessel are protected with heavy-duty oil bath
air cleaners. The oil within these air cleaners should be periodically replaced
in accordance with manufacturer recommendations. What statement best describes
when it would be appropriate to deviate from the recommended frequency? |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
| The turbocharged,
four-stroke, diesel generator set drive engines on your vessel are protected
with dry-type air intake filters. The filter element condition can be evaluated
by attaching a water manometer to measure the vacuum in the air duct between
the air intake filter and the turbocharger blower inlet. Assume that the
manometer reads 10" of water column (negative) at rated engine rpm
under full load with a clean, properly sealing filter element. What would
a reading of 20" of water column (negative) indicate at rated engine
rpm under full load? |
The filter element
is slightly restricted with dust but does not yet require replacement. |
The filter element
is being severely bypassed due to an improper seal and should be immediately
re-seated. |
The filter element
is being slightly bypassed due to an improper seal and can be ignored until
time is available for re-seating. |
The filter element
is severely restricted with dust and requires immediate replacement. |
| The turbocharged,
four-stroke, diesel engines on your vessel are protected with dry-type air
intake filters. The engines are fitted with dial-type restriction indicators
measuring the pressure in the air duct between the air intake filter and
the turbocharger blower inlet. Under what conditions should the air intake
filters be evaluated using the restriction indicators? |
The engine should
be running at idle RPM with no load (propulsion clutch disengaged). |
The engine should
be running at rated RPM with no load (propulsion clutch disengaged). |
The engine should
be running at rated RPM with full load (propulsion clutch engaged). |
The engine should
be running at idle RPM with minimal load (propulsion clutch engaged). |
| The vessel to
which you are assigned has a main engine fuel system as shown in the illustration.
When the filter and water separator as shown in the day tank fill line are
combined into one unit, what is this called? Illustration MP-FO-06 |
A strainer. |
An absorption
type filter. |
A coalescing type
filter. |
An adsorption
type filter. |
| The vessel to
which you are assigned has diesel generators fitted with fuel systems as
shown in the illustration. What statement is true concerning items "11", "13",
and "15"? Illustration MP-FO-17 |
Item "11"
is a high pressure fuel line. Item "13" is the common injector
leak off line. Item "15" is the injection pump return line. |
Item "11"
is a high pressure fuel line. Item "13" is the common rail supply
line. Item "15" is the injection pump return line. |
Item "11"
is a low pressure fuel line. Item "13" is the common injector
leak off line. Item "15" is the injection pump return line. |
Item "11"
is a high pressure fuel line. Item "13" is the common injector
leak off line. Item "15" is the injection pump supply line. |
| The diesel generator
on service on your anchor-handling supply vessel is undergoing cyclic, rhythmic
variations in speed at steady load. When the governor output shaft is disconnected
from the fuel control linkage and the linkage is blocked manually, these
variations in engine speed stop. What would be an appropriate corrective
action? |
Make an adjustment
at the compensating needle valve. |
Replace the governor
drive gears. |
Replace the fuel
injector nozzle of the misfiring cylinder. |
Tighten the bolts
securing the governor base to the engine. |
| The lubricating
oil system supporting the main propulsion reduction gear on your articulated
tug- barge unit is fitted with a lube oil strainer as shown in the illustration.
Assuming coast-wise voyages where the engine-room is periodically unmanned,
how often should the handle "A" be rotated for cleaning purposes?
Illustration MO-0057 |
Once per day while
underway. |
Once per month. |
Once every six
months. |
Once per year. |
| The diesel generators
on the platform supply vessel to which you are assigned are fitted with
a charge air system as shown in the illustration. What statement is true
concerning this type of charge air system? Illustration MO-0134 |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is directly proportional to engine speed. |
The scavenging
blower is a positive displacement type, and the actual displacement is directly
proportional to engine speed. |
The scavenging
blower is a positive displacement type, and the actual displacement is not
directly proportional to engine speed. |
The scavenging
blower is a non-positive displacement type, and the actual displacement
is not directly proportional to engine speed. |
| You suspect that
a diesel generator set on your general purpose offshore supply vessel has
a defective unit injector because the engine, although warm, is running
roughly. The two-stroke engine is fitted with mechanically operated unit
injectors. When you push and hold down the #3 cylinder injector follower,
there is no real change, as the engine continues to run roughly as before.
What does this indicate? |
The #3 cylinder
unit injector is functioning properly. One of the other cylinder unit injectors
must be faulty. |
The #3 cylinder
unit injector is faulty. You have successfully isolated the faulty unit
injector. |
Either the #4,
#5, or #6 cylinder unit injector is faulty. The #1 and #2 cylinder unit
injectors are functioning properly. |
Either the #1
or #2 cylinder unit injector is faulty. The #4, #5 and #6 cylinder unit
injectors are functioning properly. |
| You are on a salvage
tug using main propulsion engines of the type shown in the illustration.
Assuming that the piston is properly positioned, what statement represents
the procedure for inspection of the compression rings while in place inside
the engine? Illustration MO-0227 |
The inspection
takes place by removing the appropriate air box hand hole cover and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate cylinder head valve cover and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate oil pan cover and viewing through
the resulting opening. |
It is not possible
to inspect the compression rings while in place inside the engine. |
| You are assigned
to an anchor handling supply vessel with a propulsion system as shown in
figure "B" of the illustration. What type of propulsion system
is illustrated? Illustration MO-0215 |
Controllable pitch
propeller |
Voith-Schneider
drive |
Schottel-azimuthing
drive (z-drive) |
Conventional fixed
pitch propeller |
| You are assigned
as an engineer on an anchor handling vessel using main propulsion engines
of the type shown in the illustration. Fortunately, with engines of this
type, it is possible to inspect the compression rings while in place inside
the engine. What would be the indication of properly functioning rings?
Illustration MO-0224 |
The rings should
NOT be free to move within their grooves and their faces should be bright
and shiny. |
The rings should
be free to move within their grooves, and their faces should be blackened
with carbon. |
The rings should
be free to move within their grooves, and their faces should have vertical
brown streaks. |
The rings should
be free to move within their grooves and their faces should be bright and
shiny. |
| While preparing
an engine for departure, the engineer notices water coming from both the
waste heat boiler and turbocharger drains. Which of the following could
be the cause? |
Leak in a waste
heat boiler tube. |
Leak from a cylinder
exhaust valve cage. |
Leak in a turbocharger
exhaust casing. |
Leak from a turbocharger
inlet casing. |
| Which segment
of the two-stroke cycle engine diagram shown in the illustration represents
'supercharging'? Illustration MO-0037 |
I |
II |
III |
IV |
| Which of the following
conditions best describes the reason for performing a bottom blow on an
auxiliary steam boiler as fitted on your vessel? |
High water. |
Excess chemicals
and/or salinity. |
Priming and carryover. |
Sludge removal. |
| Which of the following
closed, re-circulating cooling water system problems associated with marine
diesel engines is defined as an electro-chemical process by which a metal
(such as iron) returns to its natural oxide state? |
Corrosion |
Scaling |
Fouling |
Erosion |
| When rolling over
a main engine on your vessel prior to starting with the cylinder test valves
open to expel any fluids accumulated within the cylinders, a rather large
amount of water is discharged. What is the appropriate response? |
Start the engine,
but run the engine with the cylinder test valves cracked slightly open. |
Start the engine,
but monitor all fluid levels very closely, especially that of the jacket
water. |
Start the engine,
but maintain the jacket water expansion tank level higher than normal. |
Do not allow the
engine to be started until the cause of the water discharge has been determined
and corrected. |
| When preparing
an engine for sea, the engineer notices water coming from both the turbo-charger
exhaust casing drain and one cylinder indicator valve. Which of the following
could be the possible cause? |
Leak in a turbo-charger
inlet air casing. |
Leak in a turbo-charger
exhaust gas casing. |
Leak in the cylinder
start air valve cage. |
Leak in the cylinder
exhaust valve cage. |
| When cleaning
burner atomizers associated with an oil-fired auxiliary boiler, which of
the following metals would be recommended to use in fabricating a tool for
the purposes of carbon removal? |
Copper |
Tungsten |
Titanium |
Chrome-moly steel |
| When checking
the cylinder jacket water cooling expansion tank level on a main propulsion
diesel engine on your towing vessel while underway on a coast-wise voyage,
what should be the expansion tank level? |
The level should
be in the upper part of the sight glass when the engine is at operating
temperature. |
The level should
be in the lower part of the sight glass when the engine is at operating
temperature. |
The level should
be out of sight high in the sight glass when the engine is at operating
temperature. |
The actual level
is unimportant as long as it is visible in the sight glass when the engine
is at operating temperature. |
| When checking
the crankcase oil level on an off-line diesel generator set engine on your
offshore oil spill response vessel, what should be the oil level as indicated
on the dipstick? |
The level should
be between the FULL and ADD marks on the dipstick. |
The actual level
is unimportant as long as it is visible on the dipstick. |
The level should
be below the ADD mark on the dipstick. |
The level should
be well above the FULL mark on the dipstick. |
| When checking
the crankcase oil level on a main propulsion engine on your offshore oil
spill response vessel while underway, what should be the oil level as indicated
on the dipstick? |
The actual level
is unimportant as long as it is visible on the dipstick when the engine
is running. |
The level should
be well above the FULL mark on the side of the dipstick marked with engine
IDLE and oil HOT. |
The level should
be between the FULL and ADD marks on the side of the dipstick marked with
engine IDLE and oil HOT. |
The level should
be below the ADD mark on the side of the dipstick marked with engine IDLE
and oil HOT. |
| What would be
the most practical and efficient way of removing soot deposits from the
fire-sides of the tubes of an auxiliary water-tube natural-circulation boiler
as fitted on your platform supply vessel? |
Use of an air
lance. |
Use of a suitable
acid. |
Use of a high-pressure
water jet. |
Use of a power
driven wire brush. |
| What statement
is true concerning the primary purpose of an exhaust muffler/silencer fitted
on the exhaust system for any diesel engine so equipped? |
Minimize sound
attenuation while maximizing exhaust system back pressure. |
Minimize sound
attenuation while minimizing exhaust system back pressure. |
Maximize sound
attenuation while minimizing exhaust system back pressure. |
Maximize sound
attenuation while maximizing exhaust system back pressure. |
| What may cause
a diesel engine cylinder head to crack? |
a leaking oil
control ring |
heat transfer
from exhaust valves |
overheated intake
valves |
scale on cooling
passages |
| What is the purpose
of the mixing tank shown in the illustration? Illustration MO-0058 |
To enable the
changeover from hot heavy fuel to cold distillate fuel to occur gradually |
To prevent overheating
of the day tank |
To permit vaporized
lighter fuel fractions to vent |
All of the above. |
| What effect does
nitrogen, as a volumetric component of a diesel engine's cylinder air charge,
have on the ignition and combustion? |
Nitrogen impedes
fuel penetration. |
Nitrogen advances
fuel ignition. |
Nitrogen retards
fuel ignition. |
Nitrogen has no
effect on ignition and combustion. |
| What actions should
you take if the separator shown in the illustration trips due to excessive
vibration? Illustration MO-0127 |
Open the bowl
with shooting water to release all liquid. Stop the separator. Determine
the cause of vibration and rectify. Reset the vibration switch. Restart
separator. |
Stop the separator.
Reset the vibration switch. Adjust down the setpoint of the vibration switch.
Restart separator. |
Stop the separator
and keep the bowl filled with liquid during rundown. Determine the cause
of the vibration and rectify. Reset the vibration switch. Restart separator. |
Separators do
not have vibration switches fitted due to other vibrations in engine room. |
| Wet-type exhaust
silencers, that are used with some lifeboat diesel engines, utilize which
design feature? |
The silencer is
equipped with a water seal. |
The exhaust gases
are preheated in the silencer to reduce noise. |
A cooling water
spray and internal baffles break up the exhaust gas flow. |
The exhaust temperature
always increases when passing through the silencer. |
| The vessel to
which you are assigned is fitted with generator engines as shown in the
illustration. What statement is true concerning the cylinders? Illustration
MO-0163 |
The cylinder walls
are integral (non-replaceable) to the cylinder block. |
The cylinder liners
are of the jacketed type and are replaceable inserts. |
The cylinder liners
are of the wet type and are replaceable inserts. |
The cylinder liners
are of the dry type and are replaceable inserts. |
| The vessel to
which you are assigned is fitted with generator drive engines of the type
shown in the illustration. In terms of operating cycle and cylinder configuration,
what statement is true? Illustration MO-0163 |
This is a two-stroke
cycle, 60° V-type engine. |
This is a four-stroke
cycle, 90° V-type engine. |
This is a two-stroke
cycle, 90° V-type engine. |
This is a four-stroke
cycle, 60° V-type engine. |
| The vessel to
which you are assigned has main engines fitted with intake and exhaust systems
as shown in the illustration. Assume that the vacuum between the air filter
and the turbocharger blower inlet is 12" of water column (negative
with respect to atmospheric pressure) when the engine is running at 50%
of maximum, continuous rated load. What will happen to the suction vacuum
when the load is increased to 100% of maximum continuous rated load? Illustration
MO-0076 |
The depth of vacuum
will increase (reading more inches of water column negative with respect
to atmospheric pressure). |
The depth of vacuum
will decrease (reading less inches of water column negative with respect
to atmospheric pressure). |
No change in the
depth of vacuum will occur (reading the same inches of water column negative
with respect to atmospheric pressure). |
A loss of vacuum
will occur (now reading inches of water column positive with respect to
atmospheric pressure). |
| The turbochargers
on the main propulsion engines on the tug to which you are assigned are
fitted with an exhaust inlet screen to protect the turbocharger turbine.
Upon inspection, pieces of broken piston rings or exhaust valves are found
in the foreign object trap box. Besides removing this debris, with respect
to the screen what should be done? |
The screen should
be replaced without conducting any further checking or investigation. |
The screen should
be magnafluxed to check for damage not visible to the naked eye. |
The screen should
be placed in a press to remove any indentations from impingement. |
The screen should
be replaced only when damage is obvious to the naked eye. |
| The salvage tug
to which you are assigned is fitted with generator set drive engines as
shown in the illustration. What statement is true in terms of the combustion
chamber design? Illustration MO-0006 |
The engine uses
an open type combustion chamber with a hemispherical fire-deck. |
The engine uses
turbulence chambers with a hemispherical fire-deck. |
The engine uses
an open type combustion chamber with a flat fire-deck. |
The engine uses
pre-combustion chambers with a flat fire-deck. |
| The river pushboat
to which you are assigned has a pneumatic propulsion control system as shown
in the illustration. What statement is true concerning transfer of control?
Illustration MO-0168 |
The transfer valve
at the pneumatic remote control station is used to transfer control of propulsion
from the pneumatic remote control station to the mechanical slave remote
control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
mechanical slave remote control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
engine room control station or vice versa. |
The transfer valve
at the engine room control station is used to transfer control of propulsion
from the engine room control station to the pilot house pneumatic master
control station or vice versa. |
| The pneumatic
propulsion control system used on your oil platform supply vessel uses a
diaphragm- operated relay valve as shown in the illustration. Periodically,
the valve is to be disassembled for cleaning and inspection. What statement
best describes the proper method for lubrication upon reassembly? Illustration
MO-0052 |
O-rings should
be lubricated with a silicone-based grease. |
O-rings should
be lubricated with penetrating oil. |
O-rings should
be lubricated with desiccant powder. |
O-rings should
not be lubricated by any means. |
| The OSV to which
you are assigned is fitted with a totally pneumatic propulsion control system
as shown in the illustration. All propulsion controls function properly
from all locations with the exception of the pneumatic remote control station.
Here the propulsion engine will run only at idle and neither propulsion
clutch will engage regardless of the throttle lever control position. Which
of the following system faults best accounts for these symptoms? Illustration
MO-0168 |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The attendance
valve at the pilot house pneumatic master control station has a blocked
outlet port. |
The throttle lever
control at the pneumatic remote control station has a blocked speed signal
pilot air port. |
The pilot house/remote
transfer valve at the pilot house pneumatic master control station has a
blocked remote port. |
| The oil spill
response vessel to which you are assigned has diesel generators fitted with
multi- plunger pumps with the metering principle as shown in the illustration.
What statement is true concerning this injection pump type? Illustration
MO-0145 |
As the load changes,
the beginning of injection is variable, and the ending of injection is variable. |
As the load changes,
the beginning of injection is constant, and the ending of injection is variable. |
As the load changes,
the beginning of injection is variable, and the ending of injection is constant. |
As the load changes,
the beginning of injection is constant, and the ending of injection is constant. |
| The offshore supply
vessel to which you are assigned is fitted with generator set drive engines
as shown in the illustration. What statement is true in terms of the combustion
chamber design? Illustration MO-0006 |
The engine uses
turbulence chambers with a hemispherical fire-deck. |
The engine uses
an open type combustion chamber with a hemispherical fire-deck. |
The engine uses
pre-combustion chambers with a flat fire-deck. |
The engine uses
an open type combustion chamber with a flat fire-deck. |
| The offshore supply
vessel to which you are assigned has main engines fitted with intake and
exhaust systems as shown in the illustration. What statement is true concerning
the turbocharger charge air discharge arrangements? Illustration MO-0177 |
The left side
turbocharger discharges charge air to the right cylinder bank, and the right
side turbocharger discharges charge air to the left cylinder bank. |
The left side
turbocharger discharges charge air to the left cylinder bank, and the right
side turbocharger discharges charge air to the right cylinder bank. |
The left side
turbocharger discharges charge air to both cylinder banks, and the right
side turbocharger discharges charge air to both cylinder banks. |
It is not possible
to determine the turbocharger charge air discharge arrangements in this
particular drawing. |
| The manufacturer
of the main propulsion diesel engines on your oil platform supply vessel
specifies the requirements for total hardness of fresh water makeup for
the closed, recirculating fresh water cooling system in milligrams per liter
(mg/L). If the fresh water test reported a total hardness of 5.7 grains
per gallon (gpg), using the conversion chart of the illustration, what would
be the total hardness in mg/L? Illustration MO-0208 |
0.333 mg/L |
0.9748 mg/L |
9.757 mg/L |
97.57 mg/L |
| The main propulsion
diesel engines used to power the offshore supply boat to which you are assigned
are started with vane-type air-starting motors designed to operate at 250
psig. The in-line lubricator should provide 3 drops of oil per cranking
minute, as long as the in-line lubricator oil viscosity is as specified.
If the start air pressure is within the normal range and the oil viscosity
is correct, but the oil injection rate is only 1 drop per minute, what should
be done? |
The starting air
pressure supplied to the air-starting motors should be increased. |
The in-line lubricator
oil injection metering needle valve should be further opened. |
The in-line lubricator
oil injection metering needle valve should be further closed. |
The oil in the
in-line lubricator should be replaced with oil of lower viscosity than specified. |
| The main propulsion
diesel engines fitted on your tug are started with vane-type air-starting
motors. What statement concerning air-start motor lubricator maintenance
is true? (Assume a metal bowl fitted with a tubular sight glass.) |
The lubricator
reservoir bowl should be re-filled with clean oil as soon as the level drops
to the very upper part of the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil when it becomes approximately
half full as shown in the glass. |
The lubricator
reservoir bowl should be re-filled with clean oil when it is estimated that
the bowl is completely empty. |
The lubricator
reservoir bowl should be re-filled with clean oil when the level is no longer
visible in the glass. |
| The main engines
on your anchor handling supply vessel are equipped with manual shutdown
levers as shown in the illustration. What statement concerning manual shutdown
is true? Illustration MO-0171 |
The manual shutdown
lever is operated by means of the over speed trip reset lever and uses the
over speed trip mechanism to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of a remote pull cable and uses the governor
fuel control linkage to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of the emergency trip reset lever and uses the
governor fuel control linkage. |
The manual shutdown
lever is operated by means of a remote pull cable and uses the over speed
trip mechanism to accomplish engine shutdown. |
| The main diesel
engines on your general purpose supply vessel are protected with an array
of devices designed to provide an alarm or possible shutdown for various
unsafe conditions. During the maintenance procedure for adjusting the alarm
and/or trip point setting for such a device, which of the following devices
would have a time delay associated with it? |
Engine coolant
high temperature alarm device. |
Engine crankcase
high pressure trip/alarm device. |
Engine overspeed
trip/alarm device. |
Engine low lube
oil pressure trip/alarm device. |
| The lubricating
oil system supporting the main propulsion reduction gear on the platform
supply vessel to which you are assigned is fitted with a sea water cooled
4-pass shell and tube lube oil cooler. The water box sacrificial zinc anodes
must be inspected periodically. Which of the following listed actions correctly
states maintenance criteria pertaining to scale build-up on the zincs? |
Any sacrificial
zinc anodes with accumulated scale build-up should be replaced regardless
of the degree of deterioration. |
Any accumulated
scale build-up on sacrificial zinc anodes should be scraped off until the
zinc anodes are shiny. |
Any accumulated
scale build-up on sacrificial zinc anodes should be left intact to ensure
proper protection from galvanic corrosion. |
There is no need
to check for scale build-up on the sacrificial zinc anodes as this phenomenon
is not physically possible. |
| The heating plant
on your anchor handling supply vessel is of the type shown in the illustration.
What statement is true concerning the system pumps? Illustration MO-0194 |
The circulating
and feed pumps both run continuously. |
The circulating
and feed pumps both run intermittently. |
The circulating
pump runs intermittently and the feed pump runs continuously. |
The circulating
pump runs continuously and the feed pump runs intermittently. |
| The harbor tug
to which you are assigned has diesel generators fitted with injectors with
the operating principle as shown in the illustration. What statement is
true concerning the metering principle used in this system? Illustration
MO-0146 |
The amount of
fuel injected is dependent upon the cylinder compression pressure and the
cylinder compression temperature. |
The amount of
fuel injected is dependent upon the distance of plunger travel. |
The amount of
fuel injected depends upon the injector pre-load torque setting. |
The amount of
fuel injected is dependent upon the pressure of the inlet fuel to the injector
and the length of time the orifice is open during metering. |
| The fresh water
cooling systems serving the main engines on your general purpose supply
vessel are arranged as shown in the illustration. If coolant drain valves
are inadvertently opened during engine operation, what combination set of
symptoms would most likely result? Illustration MO-0138 |
Low level in the
jacket water expansion tank. High fresh water outlet temperature from the
engine. High fresh water pump(s) discharge pressure. |
Low level in the
jacket water expansion tank. High fresh water outlet temperature from the
engine. Low fresh water pump(s) discharge pressure. |
High level in
the jacket water expansion tank. High fresh water outlet temperature from
the engine. High fresh water pump(s) discharge pressure. |
Low level in the
jacket water expansion tank. Low fresh water outlet temperature from the
engine. Low fresh water pump(s) discharge pressure. |
| The diesel engines
on your general purpose supply vessel are all protected with dry-type air
filters. The air filters should be inspected and replaced in accordance
with manufacturer instructions. What is the generally accepted criteria
that would dictate when filter replacement becomes necessary? |
The air filter
element should be replaced when the pressure drop across the element increases
above the specified maximum. |
The air filter
element should be replaced when the pressure drop across the element decreases
below the specified minimum. |
The air filter
element should be replaced when the pressure rise across the element increases
above the specified maximum. |
The air filter
element should be replaced when the pressure rise across the element decreases
below the specified minimum. |
| The diesel engine
connecting rods shown in the illustration are distinctively named __________.
Illustration MO-0122 |
fork and blade |
hook and nail |
male and female |
left hand and
right hand |
| The auxiliary
oil-fired water-tube steam boiler on your ship-docking tug is equipped with
a water column similar to that shown in the illustration. Assuming that
the water level is at the normal operating water level (NOWL) of the boiler,
what would be the result of alternately opening and reclosing each of the
water column tri-cocks? Illustration MO-0093 |
Steam should issue
from the uppermost tri-cock, and water should issue from both the middle
and lowermost tri-cocks. |
Steam should issue
from both the uppermost and middle tri-cocks, and water should issue from
the lowermost tri-cock. |
Steam should issue
from the uppermost tri-cock, and water should issue from lowermost tri-
cock. Either steam or water could issue from the middle tri-cock. |
Water should issue
from each of the uppermost, middle, and lowermost tri-cocks. |
| The auxiliary
oil-fired fire-tube steam boiler fitted on your vessel is equipped with
a water level electrode assembly similar to that shown in the illustration.
Under normal circumstances, what would be considered a normal operating
water level (NOWL)? Illustration MO-0047 |
Anywhere from
the top of the electrode labeled "C" to the bottom of the electrode
labeled "C". |
Anywhere from
the bottom (tip) of the electrode labeled "B" to the bottom (tip)
of the electrode labeled "C". |
Anywhere from
the top of the electrode labeled "B" to the bottom of the electrode
labeled "B". |
Anywhere from
the bottom (tip) of the electrode labeled "B" to the bottom (tip)
of the electrode labeled "E". |
| The anchor handling
vessel to which you are assigned is fitted with generator drive engines
of the type shown in the illustration. In terms of operating cycle and cylinder
configuration, what statement is true? Illustration MO-0006 |
This is a two-stroke
cycle, 45° V-type engine. |
This is a four-stroke
cycle, 90° V-type engine. |
This is a two-stroke
cycle, 90° V-type engine. |
This is a four-stroke
cycle, 45° V-type engine. |
| The anchor handling
vessel to which you are assigned has a pneumatic propulsion control system
as shown in the illustration. Which control valve is responsible for by-passing
the inflation delay orifice to insure rapid and positive reversals and to
protect the clutches from excessive slip? Illustration MO-0167 |
H5 boost relay
air valve. |
C2 speed-slip
relay valve. |
H5 governor limit
relay air valve. |
H5 inflation air
relay valve. |
| The anchor handling
vessel to which you are assigned has a main propulsion engine of the type
shown in the illustration. In terms of piston action, operating cycle, and
piston type, what statement is true concerning this engine type? Illustration
MO-0069 |
This is a double-acting,
four-stroke cycle, opposed piston type engine. |
This is a double-acting,
two-stroke cycle, crosshead piston type engine. |
This is a single-acting,
two-stroke cycle, opposed piston type engine. |
This is a single-acting,
two-stroke cycle, crosshead piston type engine. |
| Suppose your ship
docking tug is equipped with 4-stroke diesel generator set drive engines
fitted with the type of charge air blower show in Fig. "B" of
the illustration. In terms of the pressure of the charge air entering the
intake manifold, what statement is true? Illustration MO-0178 |
The pressure decreases
as the engine speed increases, which is independent of engine load. |
The pressure increases
as the turbocharger speed increases, which is a function of the engine load. |
The pressure increases
as the engine speed increases, which is independent of engine load. |
The pressure decreases
as the turbocharger speed increases, which is a function of the engine load. |
| Piston rings are
replaced on the cylinder unit of a medium or slow speed diesel engine. All
measurements of the cylinder liner and piston are within limits, as is condition
of intake/exhaust valves. What is the end result of the ring replacement? |
Increased cylinder
compression ratio. |
Reduced mechanical
wear of the cylinder liner. |
Decreased cylinder
clearance volume. |
Increased cylinder
compression pressure and efficiency. |
| One cylinder on
an auxiliary diesel engine indicates a low firing pressure and high exhaust
temperature. Which of the following operating conditions would most likely
have caused this? |
late injection
timing |
air intake clogged |
early injection
timing |
low back pressure |
| On which of the
following auxiliary boiler types would soot blowers be equipped for maintaining
heat transfer efficiency? |
Water-tube forced-circulation
steam boiler |
Water-tube natural-circulation
steam boiler |
Fire-tube steam
boiler |
Electric steam
boiler |
| In preparation
for getting a salvage tug underway, what is the primary factor to consider
in whether or not pre-lubrication of the main propulsion engines shall be
necessary? |
The ambient temperature
in the engine room. |
The length of
time that the engine has been shutdown. |
The interval of
time since the last engine overhaul. |
The viscosity
of the lubricating oil. |
| In preparation
for getting a platform supply vessel underway, what is the primary factor
to consider in whether or not pre-lubrication of the main propulsion engines
shall be necessary? |
The ambient temperature
in the engine room. |
The viscosity
of the lubricating oil. |
The interval of
time since the last engine overhaul. |
The length of
time that the engine has been shutdown. |
| In a modern two
stroke, slow speed, internal combustion diesel engine, what is the part
of the engine that houses the crankshaft? |
bedplate |
sump |
cylinder block |
frame |
| Honing of a cylinder
liner is performed to retrain a certain amount of lubricating oil which
reduces the wear on the piston rings and cylinder liner. A two-step honing
process consists of pre-honing and __________. |
Post-honing |
Finish honing |
Conventional honing |
Plateau honing |
| Exhaust system
back pressure is customarily measured at the discharge of a turbocharger.
If the exhaust system back pressure is higher than normal for a given engine
load on your OSV at the point of measurement, which of the following conditions
would most likely account for this? |
Restricted turbocharger
turbine inlet screen. |
Restricted exhaust
silencer/muffler. |
Restricted exhaust
ports or valves. |
Restricted turbocharger
air intake filter. |
| Before shutting
down the main propulsion engines on an offshore supply vessel, ideally what
should be accomplished FIRST? |
The engine should
be shut down immediately with no delay period, regardless of the engine
load. |
The engine should
be operated with the load removed from the engine for several minutes, then
shut down. |
The engine should
be operated at rated load for several minutes, then shut down. |
The engine should
be operated at a steady, but substantial load for several minutes, then
shut down. |
| Before shutting
down the main propulsion engines on a tractor tug, ideally what should be
accomplished FIRST? |
The engine should
be operated at rated load for several minutes, then shut down. |
The engine should
be shut down immediately with no delay period, regardless of the engine
load. |
The engine should
be operated at a steady, but substantial load for several minutes, then
shut down. |
The engine should
be operated with the load removed from the engine for several minutes, then
shut down. |
| All modern medium
and slow speed diesel engines have components assembled via bolts that are
tensioned hydraulically, both for removal and reassembly. When using such
hydraulic devices, to what metallurgical state are you subjecting such bolts? |
When tightened,
they are above the metal's elastic limit. |
When tightened,
they are at the metal's elastic limit. |
When tightened,
they are below the metal's elastic limit. |
Initially above
the metal's elastic limit. |
| After a main diesel
engine on your vessel has experienced a safety shutdown due to excessive
crankcase pressure, why is it important to wait 2 hours before opening the
crankcase to investigate the cause of the trip? |
Opening the crankcase
before 2 hours has elapsed may result in a crankcase explosion. |
Opening the crankcase
before 2 hours has elapsed may result in crankshaft rotation. |
Opening the crankcase
before 2 hours has elapsed may result in the engine spontaneously restarting. |
Opening the crankcase
before 2 hours has elapsed may result in excessively rapid cooling. |
| A main engine
on your general purpose supply vessel has experienced a low coolant water
level alarm even though the water level in the expansion tank is normal.
Assuming that the float activated switch is designed to open at low coolant
level to activate the alarm, which of the following would account for this? |
The float is binding
in the float chamber, not permitting the float to drop. |
The float switch
wire connections are loose at the terminals, not permitting continuity through
the switch. |
The float level
switch contacts are welded closed, not permitting the contacts to open. |
It is not possible
for a low coolant level alarm to occur when the water level is normal. |
| A main engine
on your articulated tug-barge unit has experienced a low coolant water level
alarm even though the water level in the expansion tank is normal. Assuming
that the float activated switch is designed to open at low coolant level
to activate the alarm, which of the following would account for this? |
The float is binding
in the float chamber, not permitting the float to drop. |
The float level
switch contacts are welded closed, not permitting the contacts to open. |
The float switch
wire connections are loose at the terminals, not permitting continuity through
the switch. |
It is not possible
for a low coolant level alarm to occur when the water level is normal. |
| A main diesel
engine on your vessel has experienced a safety shutdown due to excessive
crankcase pressure. What is the appropriate response? |
Allow 2 hours
for the engine to cool before opening the crankcase, and determine and correct
the cause of the trip before attempting to restart the engine. |
Allow the engine
to cool off for two minutes, then restart and monitor the crankcase pressure
to verify the cause of the shutdown. |
Immediately open
the crankcase to make the necessary inspections to determine the cause of
the high crankcase pressure safety shutdown. |
Immediately restart
the engine, and monitor the crankcase pressure to verify the cause of the
shutdown. |
| According to the
illustrated cooling water systems diagram for a diesel propulsion plant,
what is the cooling medium used as a coolant in the charge air cooler(s)?
Illustrations MO-0129 |
Sea water |
Main engine cylinder
jacket water |
Central fresh
water |
Auxiliary engine
(SSDG) cylinder jacket water |
| What type of diesel
engine starting motor is pictured in the illustration? Illustration MO-0044 |
Direct current
electric cranking motor |
Axial piston hydraulic
cranking motor |
Radial piston
hydraulic cranking motor |
Sliding vane air
cranking motor |
| Which of the below
engines might power a large merchant vessel with a direct drive controllable
pitch propeller? |
Medium speed,
non-reversing engines |
Slow speed, non-reversing
engines |
Slow speed, reversing
engines |
Medium speed,
reversing engines |
| You are assigned
to an offshore oil spill response vessel fitted with main propulsion diesel
engines operating on the cycle represented in the polar timing diagram shown
in the illustration. When do the intake valves open and close respectively?
Illustration MO-0084 |
The intake valves
open at 45° after bottom dead center on the compression stroke. The intake
valves close at 75o before top dead center on the exhaust. |
The intake valves
open at top dead center at the beginning of the intake stroke. The intake
valves close at bottom dead center at the end of the intake stroke. |
The intake valves
open at bottom dead center at the end of the intake stroke. The intake valves
close at top dead center at the beginning of the intake stroke. |
The intake valves
open at 75° before top dead center on the exhaust stroke. The intake valves
close at 45o after bottom dead center on the compression stroke. |
| When checking
the cylinder jacket water cooling expansion tank level on a main propulsion
diesel engine on your offshore crew boat while underway, what should be
the expansion tank level? |
The level should
be in the upper part of the sight glass when the engine is at operating
temperature. |
The level should
be in the lower part of the sight glass when the engine is at operating
temperature. |
The level should
be out of sight high in the sight glass when the engine is at operating
temperature. |
The actual level
is unimportant as long as it is visible in the sight glass when the engine
is at operating temperature. |
| When starting
a main propulsion diesel engine fitted with attached pumps in preparation
for getting underway on your offshore supply vessel, what parameter must
be checked FIRST upon start-up to avoid immediate engine damage? |
Lubricating oil
supply header pressure. |
Sea water pump
discharge pressure. |
Cylinder jacket
water pump discharge pressure. |
Fuel oil supply
header pressure. |
| The various auxiliary
diesel engines fitted on your anchor handling vessel may employ a variety
of different cranking methods for engine starting. What type of cranking
method is shown in the illustration? Illustration MO-0044 |
Gasoline engine
cranking motor |
Hydraulic cranking
motor |
Electric cranking
motor |
Air cranking motor |
| The multi-purpose
supply vessel to which you are assigned has diesel generators fitted with
fuel systems as shown in the illustration. What statement is true concerning
items "11", "13", and "15"? Illustration MO-0154 |
Item "11"
is a high-pressure fuel line. Item "13" is the common injector
leak off line Item "15" is the injection pump return line. |
Item "11"
is a high-pressure fuel line. Item "13" is the common rail supply
line Item "15" is the injection pump return line. |
Item "11"
is a high-pressure fuel line. Item "13" is the common injector
leak off line. Item "15" is the injection pump supply line. |
Item "11"
is a low-pressure fuel line. Item "13" is the common injector
leak off line. Item "15" is the injection pump return line. |
| The anchor handling
supply vessel to which you are assigned has diesel generators fitted with
intake and exhaust systems as shown in the illustration. What does the component
labelled "3" represent? Illustration MO-0176 |
Charge air manifold. |
Exhaust manifold. |
Wet muffler. |
Charge air cooler. |
| You are replacing
an automotive type cooling water thermostat on one of the diesel generator
sets on your anchor-handling supply vessel. The markings on the original
thermostat indicate that it was set to begin opening at 180°F. Which of
the following thermostats marked for Celsius would be a replacement that
comes closest to the value at which opening begins as compared to the original
thermostat? |
70°C |
80°C |
90°C |
100°C |
| The pneumatic
propulsion control system used on your OSV uses a diaphragm-operated relay
valve as shown in the illustration. Periodically, the valve is to be disassembled
for cleaning and inspection. What statement best describes the proper technique?
Illustration MO-0052 |
Rubber parts such
as the diaphragm should be washed with soap and water, and metal parts such
as the valve discs and seats should be cleaned with non-flammable solvent. |
Rubber parts such
as the diaphragm should be cleaned with non-flammable solvent, and metal
parts such as the valve discs and seats should be washed with soap and water. |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be cleaned with non-flammable solvent. |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be washed with soap and water. |
| The steam generating
plant on your oil platform supply vessel is of the type shown in the illustration.
Which of the labelled components would be the steam separator? Illustration
MO-0196 |
1 |
2 |
3 |
5 |
| The steam generating
plant on your oil spill response vessel is of the forced-circulation type.
Which figure of the illustration represents a steam generator or boiler
of this type? Illustration MO-0197 |
1 |
2 |
3 |
4 |
| The water-tube
natural-circulation steam boiler on your general-purpose supply vessel is
equipped with soot blowers for maintaining heat transfer efficiency. Which
of the following statements best describes the conditions that must be met
before tubes can be safely blown using the soot blowers? |
The boiler draft
must be increased AND the boiler fires must be lit before tubes can be safely
blown. |
The boiler draft
must be decreased AND the boiler fires must be lit before tubes can be safely
blown. |
The boiler draft
must be increased AND the boiler fires must be secured before tubes can
be safely blown. |
The boiler draft
must be decreased AND the boiler fires must be secured before tubes can
be safely blown. |
| Which of the following
conditions best describes the reason for performing a bottom blow on an
auxiliary steam boiler as fitted on your offshore supply vessel? |
High water |
Sludge removal |
Priming and carryover |
Excess chemicals
and/or salinity |
| You suspect that
the diesel-generator in service on your oil spill response vessel has a
low coolant level. Assuming that the cooling water system is pressurized
and has no sight glass associated with the expansion tank, which of the
following represents the proper procedure for checking the coolant level? |
Shut down the
engine. With a rag, very rapidly remove the pressure cap to relieve the
system pressure. With the cap removed, check the coolant level. |
Shut down the
engine, and allow the engine to cool. With a rag, very slowly remove the
pressure cap to relieve the system pressure With the cap removed, check
the coolant level. |
Allow the engine
to continue to run with a normal load. With a rag, very slowly remove the
pressure cap to relieve the system pressure. With the cap removed, check
the coolant level. |
Allow the engine
to continue to run, but with the load removed. With a rag, very rapidly
remove the pressure cap to relieve the system pressure. With the cap removed,
check the coolant level. |
| What is the length
of the fastener used to secure the packing gland shown in the illustration?
Illustration GS-0012 |
1 inch |
1 1/4 inches |
1 1/2 inches |
2 1/2 inches |
| At appropriate
intervals, inspection rounds should be made of the main propulsion plant,
auxiliary machinery, and steering spaces. If bilge levels are identified
to be high, they should be ____________. |
pumped directly
overboard |
pumped overboard
through a filter |
pumped overboard
through an OWS or to a holding tank |
any of the above
depending on the oil content of the water |
| You are assigned
to a fishing industry factory ship fitted with main propulsion diesel engines
of the type shown in the illustration. If the engine's crankshaft is turning
at 900 rpm, what will be the rotational speed of the two camshafts? Illustration
MO-0122 |
450 rpm |
900 rpm |
1800 rpm |
Not enough information
is given to determine camshaft rpm. |
| You are assigned
to a fishing factory ship fitted with main propulsion diesel engines of
the type shown in the illustration. If the engine's crankshaft is turning
at 720 rpm, what will be the rotational speed of the two camshafts? Illustration
MO-0005 |
360 rpm |
720 rpm |
1440 rpm |
Not enough information
is given to determine camshaft rpm. |
| You are assigned
as an engineer on an uninspected fishing trawler using main propulsion engines
of the type shown in the illustration. What statement represents the procedure
for inspection of the lower cylinder liner bore while in place inside the
engine? Illustration MO-0122 |
With the particular
piston positioned at BDC and the corresponding air box handhole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at TDC and the corresponding oil pan handhole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at TDC and the corresponding air box handhole cover removed,
inspect the lower liner bore through the crankcase opening. |
With the particular
piston positioned at BDC and the corresponding oil pan handhole cover removed,
inspect the lower liner bore through the crankcase opening. |
| When checking
the cylinder jacket water cooling expansion tank level on a main propulsion
diesel engine on your fishing factory ship while underway, what should be
the expansion tank level? |
The level should
be in the upper part of the sight glass when the engine is at operating
temperature. |
The actual level
is unimportant as long as it is visible in the sight glass when the engine
is at operating temperature. |
The level should
be out of sight high in the sight glass when the engine is at operating
temperature. |
The level should
be in the lower part of the sight glass when the engine is at operating
temperature. |
| When starting
a main propulsion diesel engine fitted with attached pumps in preparation
for getting underway on your fishery research vessel, what parameter must
be checked FIRST upon start-up to avoid immediate engine damage? |
Lubricating oil
supply header pressure. |
Cylinder jacket
water pump discharge pressure. |
Sea water pump
discharge pressure. |
Fuel oil supply
header pressure. |
| The diesel generator
engines onboard your mollusc dredger use a lubricating oil filtration scheme
as shown in the illustration. What type of filtration system is illustrated?
Illustration MO-0181 |
Sump filtration |
Bypass filtration |
Full-flow filtration |
Shunt filtration |
| The mollusc dredger
to which you are assigned has diesel generator engines fitted with intake
and exhaust systems as shown in the illustration. What type of turbo charging
configuration is used? Illustration MO-0176 |
Constant pressure
turbo charging. |
Pulse turbo charging. |
Boost-controlled
turbo charging. |
2-stage turbo
charging. |
| The fresh water
cooling systems serving the main engines of the fishery research vessel
to which you are assigned are arranged as shown in the illustration. What
statement best describes the arrangement of the fresh water keel cooler
shown in the system diagram? Illustration MO-0138 |
The keel cooler
is mounted on the inside of the hull below the water line. |
The keel cooler
is mounted on the inside of the hull above the water line. |
The keel cooler
is mounted on the outside of the hull above the water line. |
The keel cooler
is mounted on the outside of the hull below the water line. |
| The mollusc dredger
to which you are assigned is fitted with reduction gears as shown in the
illustration. What statement is true concerning this type of reduction gear?
Illustration MO-0085 |
The reduction
gear is a single-input, double-reduction type of gear. |
The reduction
gear is a single-input, single-reduction type of gear. |
The reduction
gear is a double-input, double-reduction type of gear. |
The reduction
gear is a double-input, single-reduction type of gear. |
| When checking
the valve stem to rocker arm clearances on an auxiliary diesel engine onboard
your fishery research vessel, which of the following statements concerning
intake and exhaust clearances when taken cold is correct? |
When taken cold,
a properly adjusted exhaust valve clearance could be less than or greater
than the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be less than
the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be equal to
the intake valve clearance. |
When taken cold,
a properly adjusted exhaust valve clearance would definitely be greater
than the intake valve clearance. |
| The main propulsion
diesel engines on the fishery research vessel to which you are assigned
are started with vane-type air-starting motors. At a minimum, in the absence
of automatic drain valves, how often should the starting air receivers be
drained of moisture while the vessel is underway? |
Hourly |
Daily |
Weekly |
Monthly |
| The diesel generator
sets on your mollusc dredger use a starting system similar to the one shown
in the illustration. While the engine is running, the starting battery bank
terminal voltage and specific gravity gradually fall off and the ammeter
indicates a discharging battery bank, eventually resulting in a dead battery
bank. Which of the following failures would most likely result in this condition?
Illustration MO-0202 |
An open circuited
start switch. |
An open voltage
regulator/alternator field circuit. |
An open circuited
starter solenoid coil. |
A closed oil pressure
switch. |
| On diesel engines
used on a fishing industry factory ship, which type of injection system
is most likely to use sophisticated electronic controls for timing and metering? |
In-line multi-plunger
pump |
Distributor type
pump |
Unit injector
type pump |
Rotary plunger
type pump |
| The mollusc dredger
to which you are assigned has diesel generators fitted with unit injectors
of the type shown in the illustration. What statement is true concerning
the operation of unit injectors of this type? Illustration MO-0143 |
Pressurization
of the fuel is accomplished by the electronically controlled solenoid, and
the timing and metering of the fuel is accomplished by the mechanically
operated rocker arm. |
Pressurization
and timing of the fuel is accomplished by the mechanically operated rocker
arm, and the metering of the fuel is accomplished by the electronically
controlled solenoid. |
Pressurization
and metering of the fuel is accomplished by the mechanically operated rocker
arm, and the timing of the fuel is accomplished by the electronically controlled
solenoid. |
Pressurization
of the fuel is accomplished by the mechanically operated rocker arm, and
the timing and metering of the fuel is accomplished by the electronically
controlled solenoid. |
| The main propulsion
diesel engines on the fishery research vessel to which you are assigned
are fitted with mechanically operated and controlled unit injectors. When
are the sintered metal supply and return injector filters typically replaced? |
Whenever the coalescing
fuel filters are drained of sludge and moisture. |
Whenever the unit
injectors are removed for reconditioning. |
Whenever the fuel
system secondary filter elements are replaced. |
Whenever the fuel
system primary suction strainer is cleaned. |
| The two-stroke
cycle main propulsion engines on the fishing trawler to which you are assigned
are fitted with Roots-type blowers for scavenging purposes. Upon inspection
of the air boxes, what condition would indicate a need to replace the Roots-type
blower immediately? |
Aluminum dust
residue. |
Iron dust residue. |
Water accumulations. |
Oil accumulations. |
| The pneumatic
propulsion control system used on your fishing factory ship uses a diaphragm-
operated relay valve as shown in the illustration. Periodically, the valve
is to be disassembled for cleaning and inspection. What statement best describes
the proper technique? Illustration MO-0052 |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be washed with soap and water. |
Rubber parts such
as the diaphragm should be cleaned with non-flammable solvent, and metal
parts such as the valve discs and seats should be washed with soap and water. |
Rubber parts such
as the diaphragm should be washed with soap and water, and metal parts such
as the valve discs and seats should be cleaned with non-flammable solvent. |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be cleaned with non-flammable solvent. |
| The fishing factory
ship to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If the astern clutch fails
to engage from the engine room control station, but engages properly from
all remote-control stations, which of the following system faults best accounts
for these symptoms? Illustration MO-0168 |
The clutch actuator
4-way control valve at the clutch control panel has a restricted astern
clutch quick exhaust port opening. |
The control lever
at the engine room control station has a blocked astern clutch engagement
pilot port. |
The astern clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
| Using the oil
chart provided in the illustration for guidance, what would be the recommended
straight weight petroleum oil to use in a main engine speed control governor
on your fishery research vessel, if the governor is to remain in the acceptable
operating range and the governor oil operating temperature may drop as low
as 40°F? Illustration MO-0161 |
SAE 10 |
SAE 20 |
SAE 30 |
SAE 40 |
| In recording trend
analysis data for the main propulsion engines on your anchor-handling supply
boat, it is important to take and record readings under similar, if not
constant conditions of load and speed each time. What other criteria must
be considered as to when the readings are to be recorded? |
The readings should
be recorded when the lube oil and cooling water temperatures are stabilized
within plus or minus 5oF of normal operating temperature under the conditions
of specified load and speed. |
The readings should
be recorded when the lube oil and cooling water temperatures are stabilized
within plus or minus 50oF of normal operating temperature under the conditions
of specified load and speed. |
The readings should
be recorded the instant the specified load and speed conditions are achieved
without regard to engine operating temperatures. |
The readings should
be recorded when the cylinder exhaust temperatures are all within 5oF of
each other under the conditions of specified load and speed. |
| The main engines
on your OSV utilize a starting system with two air-start motors similar
to that shown in the illustration. Upon pushing the start button, the solenoid
air valve energizes open, but the air start relay valve fails to receive
pilot air, and thus the starter motors and engine fail to rotate. Which
of the listed conditions would most likely be the cause of the failure to
start? Illustration MO-0200 |
The lower pinion
fails to engage, which in turn does not allow the upper pinion to engage.
Because engagement of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The upper pinion
fails to engage, which in turn does not allow the lower pinion to engage.
Because engagement of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The upper pinion
fails to retract, which in turn does not allow the lower pinion to retract.
Because retraction of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The lower pinion
fails to retract, which in turn does not allow the upper pinion to retract.
Because retraction of both pinions is required to supply air to the air-start
motors, the engine does not start. |
| The multi-purpose
supply vessel to which you are assigned has a deck winch drive engine fitted
with fuel injectors with the operating principle as shown in the illustration.
In figure "A" which plunger travel position corresponds to when
fuel injection ends? Illustration MO-0144 |
1 |
2 |
3 |
4 |
| The multi-purpose
supply vessel to which you are assigned has a pneumatic propulsion control
system as shown in the illustration. What must be the position of the two
transfer valves within the system when the mechanical slave remote control
station is being used to control propulsion? Illustration MO-0168 |
The transfer valve
at the engine room control station must be in the pilot house position,
and the transfer valve at the pilot house pneumatic master control station
must be in the pneumatic remote control position. |
The transfer valve
at the engine room control station must be in the engine room position,
and the transfer valve at the pilot house pneumatic master control station
must be in the pneumatic remote control position. |
The transfer valve
at the engine room control station must be in the engine room position,
and the transfer valve at the pilot house pneumatic master control station
must be in the pilot house position. |
The transfer valve
at the engine room control station must be in the pilot house position,
and the transfer valve at the pilot house pneumatic master control station
must be in the pilot house position. |
| The multi-purpose
supply vessel to which you are assigned has main engines fitted with injectors
similar to those shown in the illustration. What statement is true concerning
the operating principle of this type of injector? Illustration MO-0151 |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve opening forces. |
The fuel pressure
within the annulus is a needle valve opening force, the compression load
on the spring is a needle valve closing force. |
The fuel pressure
within the annulus is a needle valve closing force, the compression load
on the spring is a needle valve opening force. |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve closing forces. |
| The multi-purpose
supply vessel to which you are assigned is fitted with main propulsion reduction
gears as shown in the illustration. What statement is true concerning this
type of reduction gear? Illustration MO-0142 |
This type of reduction
gear is used with a fixed pitch propeller and a reversing engine. |
This type of reduction
gear is used with a controllable pitch propeller and a reversing engine. |
This type of reduction
gear is used with a fixed pitch propeller and a non-reversing engine. |
This type of reduction
gear is used with a controllable pitch propeller and a non-reversing engine. |
| The offshore supply
vessel to which you are assigned has diesel generators fitted with injectors
with the operating principle as shown in the illustration. What statement
is true concerning the metering principle used in this system? Illustration
MO-0146 |
The amount of
fuel injected is dependent upon the distance of plunger travel. |
The amount of
fuel injected is dependent upon the pressure of the inlet fuel to the injector
and the length of time the orifice is open during metering. |
The amount of
fuel injected depends upon the injector pre-load torque setting. |
The amount of
fuel injected is dependent upon the cylinder compression pressure and the
cylinder compression temperature. |
| The offshore supply
vessel to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If propulsion control functions
perfectly from the engine room control station, but will not function at
all from any of the remote stations, which of the following system faults
best accounts for these symptoms? Illustration MO-0168 |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
The attendance
valve at the pneumatic remote control station has a blocked outlet port. |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
| The platform supply
vessel to which you are assigned has a pneumatic propulsion control system
as shown in the illustration. What statement is true concerning transfer
of control? Illustration MO-0168 |
The transfer valve
at the pneumatic remote control station is used to transfer control of propulsion
from the pneumatic remote control station to the mechanical slave remote
control station or vice versa. |
The transfer valve
at the engine room control station is used to transfer control of propulsion
from the engine room control station to the pilot house pneumatic master
control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
mechanical slave remote control station or vice versa. |
The transfer valve
at the pilot house pneumatic master control station is used to transfer
control of propulsion from the pilot house master control station to the
engine room control station or vice versa. |
| The platform supply
vessel to which you are assigned has main engines fitted with open type
combustion chambers featuring direct injection. Of the listed figures below
found in the illustration, which figure represents the most likely type
of injector nozzle type? Illustration MO-0148 |
1 |
2 |
3 |
4 |
| The pneumatic
propulsion control system used on your offshore supply vessel is configured
as shown in the illustration. In terms of clutch air system maintenance,
what statement best represents operational requirements? Illustration MO-0168 |
Whereas the cleanliness
of clutch air is critical, the dryness and pressure are clutch air are of
secondary concern. |
Whereas the clutch
air pressure is critical, the dryness and cleanliness of the clutch air
are of secondary concern. |
Whereas the dryness
of clutch air is critical, the pressure and cleanliness of the clutch air
are of secondary concern. |
The pressure,
dryness, and cleanliness of clutch air are all critical to successful pneumatic
propulsion control operations. |
| The rated speed
of the main propulsion diesel engines on your oil platform supply vessel
is 900 rpm. The installed centrifugal overspeed trip device similar to the
one shown in the illustration is designed to shut down the engine at 110%
of rated speed. Upon testing the overspeed trip device, you determine that
the actual shutdown occurs at 1080 rpm. Which of the following would account
for this? Illustration MO-0101 |
The compression
spring (item #12) was excessively compressed when the overspeed trip was
last set. |
The jam nut (item
#14) was not properly tightened against the adjusting nut (items #13) when
the overspeed trip was last set. |
The compression
spring (item #12) has broken since the last time the overspeed trip was
last set. |
The compression
spring (item #12) was insufficiently compressed when the overspeed trip
was last set. |
| The turbocharged,
four-stroke, diesel generator set drive engines on your OSV are protected
with dry-type air intake filters. The filter element condition can be evaluated
by attaching a water manometer to measure the vacuum in the air duct between
the air intake filter and the turbocharger blower inlet. Assuming that the
filter condition is evaluated at rated engine rpm under full load, what
statement is true if the restriction associated with a clean, properly sealing
filter element is 10" of water column (negative)? |
A reading of 15"
of water column (negative) could indicate that the filter element is restricted
with dust or that the filter element is being bypassed due to an improper
seal. Either condition is equally likely to result in this reading. |
A reading of 5"
of water column (negative) could indicate that the filter element is restricted
with dust or that the filter element is being bypassed due to an improper
seal. Either condition is equally likely to result in this reading. |
A reading of 5"
of water column (negative) indicates that the filter element is restricted
with dust, and a reading of 15" of water column (negative) indicates
that the filter element is being bypassed due to an improper seal. |
A reading of 15"
of water column (negative) indicates that the filter element is restricted
with dust, and a reading of 5" of water column (negative) indicates
that the filter element is being bypassed due to an improper seal. |
| When rolling over
a main engine on your anchor handling vessel prior to starting with the
cylinder test valves open to expel any fluids accumulated within the cylinders,
a rather large amount of water is discharged. What is the appropriate response? |
Start the engine,
but maintain the jacket water expansion tank level higher than normal. |
Do not allow the
engine to be started until the cause of the water discharge has been determined
and corrected. |
Start the engine,
but run the engine with the cylinder test valves cracked slightly open. |
Start the engine,
but monitor all fluid levels very closely, especially that of the jacket
water. |
| You are assigned
to an anchor handling vessel fitted with main propulsion diesel engines
operating on the cycle represented in the polar timing diagram shown in
the illustration. What combustion cycle event has a duration of 103°? Illustration
MO-0206 |
Exhaust |
Compression |
Power |
Intake |
| Your platform
supply vessel is fitted with cooling water systems serving the main propulsion
diesel engines as shown in the illustration. Which heat exchanger/cooler
application and aspect would most likely require periodic mechanical cleaning
with a specially designed brush? Illustration MO-0137 |
The outside of
the tubes of the RW/FW heat exchanger. |
The inside of
the tubes of the RW/FW heat exchanger. |
The outside of
the tubes of the lube oil cooler. |
The inside of
the tubes of the lube oil cooler. |
| A diesel engine
on your platform supply vessel has a restricted exhaust silencer/muffler
resulting in high exhaust back pressure. With an appreciable load on the
engine, what would be the condition of the exhaust gases exiting the stack? |
Gray to black
smoke. |
Bluish tinge smoke. |
White smoke. |
Clear, with no
smoke. |
| A few hours after
changing the oil on one of the diesel generator set engines on your offshore
supply vessel, you notice that the oil is significantly darkened. What does
this normally indicate? |
The darkening
of the color definitely indicates severe overheating of the lubricating
oil which requires another oil change after determining and correcting the
cause of overheating. |
The darkening
of the color normally indicates the suspension of fine particles of unburned
carbon (soot) which is a normal occurrence and does not require another
oil change. |
The darkening
of the color normally indicates water contamination of the lubricating oil
which requires another oil change after determining and correcting the source
of contamination. |
The darkening
of the color normally indicates diesel fuel contamination of the lubricating
oil which requires another oil change after determining and correcting the
source of contamination. |
| The auxiliary
steam boiler on your fishing vessel is equipped with a gauge glass for local
level indication. On which of the following auxiliary boiler types would
this gauge glass be attached to a flash chamber also known as a steam accumulator
or steam separator? |
Fire-tube steam
boiler |
Electric steam
boiler |
Water-tube forced-circulation
steam boiler |
Water-tube natural-circulation
steam boiler |
| The uninspected
fishing trawler to which you are assigned has diesel generators fitted with
unit injectors with the operating principle as shown in the illustration.
What statement is true concerning the beginning and ending of injection?
Illustration MO-0144 |
Injection begins
when the lower fuel port is covered by the lower helix of the upward moving
plunger, and injection ends when the upper fuel port is uncovered by the
upper helix of the upward moving plunger. |
Injection begins
when the upper fuel port is covered by the upper helix of the upward moving
plunger, and injection ends when the lower fuel port is uncovered by the
lower helix of the upward moving plunger. |
Injection begins
when the lower fuel port is covered by the lower helix of the downward moving
plunger, and injection ends when the upper fuel port is uncovered by the
upper helix of the downward moving plunger. |
Injection begins
when the upper fuel port is covered by the upper helix of the downward moving
plunger, and injection ends when the lower fuel port is uncovered by the
lower helix of the downward moving plunger. |
| The pressure-volume
(P-V) diagram shown in the illustration represents a theoretical diesel
engine cycle which ideally represents all diesel engines, including those
used in the towing industry. What statement is true concerning the combustion
cycle event represented between points "2" and "3" in
figure "B" of the illustration? Illustration MO-0205 |
This represents
the expansion event occurring at constant volume. |
This represents
the combustion event occurring at constant pressure. |
This represents
the compression event occurring at constant pressure. |
This represents
the combustion event occurring at constant volume. |
| You are assigned
to a tractor tug fitted with main propulsion diesel engines of the type
shown in the illustration. How many degrees of crankshaft revolution are
required for all of the engine's cylinders to fire? Illustration MO-0227 |
180 degrees |
360 degrees |
720 degrees |
Not enough information
is given to determine crankshaft degrees of revolution. |
| Prior to starting
a diesel generator set engine fitted on your salvage tug, it has been determined
that the transfer of make-up oil is required. At what checked level should
you stop adding make-up oil? |
When the oil level
rises to a level well above the FULL mark on the dipstick. |
When the oil level
rises to the FULL mark on the dipstick. |
When the oil level
rises to the between the ADD and FULL marks on the dipstick. |
When the oil level
rises to the ADD mark on the dipstick. |
| Related to the
diesel fuels used in auxiliary and main propulsion diesel engines used on
the ship- docking tug to which you are assigned, the unit of measure expressed
as centistokes (cSt) is a measure of what fuel property? |
Viscosity |
Cetane rating |
Density |
Heating value |
| The tractor tug
to which you are assigned has diesel generators fitted with a fuel injection
system that have a complete absence of high pressure fuel lines. Which figure
of the illustration represents the most likely type of fuel injection equipment
used? Illustration MO-0149 |
1 |
2 |
3 |
4 |
| The river push
boat to which you are assigned has diesel generator engines fitted with
intake and exhaust systems as shown in the illustration. What type of turbo
charging configuration is used? Illustration MO-0176 |
2-stage turbo
charging. |
Constant pressure
turbo charging. |
Boost-controlled
turbo charging. |
Pulse turbo charging. |
| The heating plant
on your sea-going salvage tug is of the type shown in the illustration.
What statement is true concerning the system pumps? Illustration MO-0194 |
The circulating
and feed pumps both run intermittently. |
The circulating
pump runs continuously and the feed pump runs intermittently. |
The circulating
and feed pumps both run continuously. |
The circulating
pump runs intermittently and the feed pump runs continuously. |
| While proceeding
in open waters to a ship requiring docking assistance, one of the main engines
on your ship-docking tug overheats. The high jacket water temperature alarm
sounds, the fresh water thermometers indicate out of range (high), and the
expansion tank level sight glass indicates out of range (high) with vapor
bubbles forming and escaping through the vent. What is the appropriate initial
response? |
Drain water from
the expansion tank. |
Shut down the
engine immediately. |
Reduce the load
and speed on the engine. |
Add makeup water
to the expansion tank. |
| Which of the following
is a benefit of the common rail fuel injection system? |
Nitrous oxide
(emissions) reduction. |
Lower specific
fuel consumption. |
Smoke reduction
over the entire load range. |
all of the above |
| The Wartsila 64
engine is equipped with automatic backflushing lube oil filter systems.
These type of filtration systems require __________. |
frequent monitoring
of differential pressure gauges |
minimal maintenance
and no disposable filter cartridges |
shifting of filter
units on a daily basis |
draining of sediment
every watch |
| Pre-combustion
chamber engines inject fuel into an antechamber located in the cylinder
wall or cylinder head. What is the antechamber referred to when the injection
nozzle is located in the main combustion chamber, outside of the antechamber? |
charging cell |
energy cell |
pressure pocket |
swirl chamber |
| What event triggers
the end of the steady combustion period in a diesel engine? |
completion of
injection |
piston reaching
top dead center |
piston reaching
bottom dead center |
intake valve or
port closing |
| Large slow-speed
diesel engines have cylinder liners that are manufactured from which of
the following materials? |
High alloyed forged
steel with chromium |
Unalloyed carbon
steel |
Pearlitic cast
iron with flake graphite |
Cast steel with
chromium |
| Which of the following
statements describes pertinent criteria for performing a surface blow for
the purposes of removing excess chemicals and/or salinity as indicated by
boiler water testing on an auxiliary steam boiler as fitted on your vessel? |
The surface blow
would be performed when the boiler is steaming AND the level would be maintained
normal during the duration of the blow. |
The surface blow
would be performed when the boiler is secured AND the level would be maintained
normal during the duration of the blow. |
The surface blow
would be performed when the boiler is secured AND the level would be maintained
above normal during the duration of the blow. |
The surface blow
would be performed when the boiler is steaming AND the level would be maintained
above normal during the duration of the blow. |
| Due to environmental
and safety concerns, the towing winch drive diesel engine cooling water
system is treated with propylene glycol for protection against freezing.
According to the illustration, what would be the limit of protection if
40 pints of propylene glycol are used in treating a cooling water system
with a volumetric capacity of 10 gallons? Illustration MO-0209 |
10°F |
-6°F |
-30°F |
-53°F |
| The ship-docking
tug to which you are assigned has main engines fitted with injectors similar
to those shown in the illustration. What statement is true concerning the
operating principle of this type of injector? Illustration MO-0151 |
The fuel pressure
within the annulus is a needle valve opening force, the compression load
on the spring is a needle valve closing force. |
The fuel pressure
within the annulus is a needle valve closing force, the compression load
on the spring is a needle valve opening force. |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve opening forces. |
The fuel pressure
within the annulus and the compression load on the spring are both needle
valve closing forces. |
| The ship-docking
tug to which you are assigned is fitted with main propulsion diesel engines
of the type shown in the illustration. In terms of valve operating gear,
cylinder liner type, and connecting rod type, what statement is true? Illustration
MO-0192 |
This is an overhead
cam engine, with wet cylinder liners and conventional connecting rods. |
This is an overhead
cam engine, with jacketed cylinder liners and marine-type connecting rods. |
This is a pushrod
operated overhead valve engine, with wet cylinder liners and conventional
connecting rods. |
This is a pushrod
operated overhead valve engine, with jacketed cylinder liners and articulated
connecting rods. |
| The steam generating
plant on your articulated tug-barge unit is of the forced-circulation type.
Which figure of the illustration represents a steam generator or boiler
of this type? Illustration MO-0197 |
1 |
2 |
3 |
4 |
| Suppose the diesel
generator set drive engines on your ocean-going tug are fitted with pressure-
compensated governors as shown in the illustration. What is the significance
of the oil inlet connection with this particular governor? Illustration
MO-0219 |
The governor uses
engine oil as a lubricant and a hydraulic power medium. |
The governor uses
variable engine lube oil pressure to sense engine speed. |
The governor uses
low engine lube oil pressure to trigger an alarm. |
The governor uses
low engine lube oil pressure to execute a safety shutdown. |
| Suppose the generator
set drive engines on your ship docking tug are fitted with hydraulic isochronous
governors such as shown in the illustration. How is the speed set point
conveyed from the generator control panel on the main switchboard conveyed
to the governor fitted on the diesel engine? Illustration MO-0160 |
Hydraulically
via tubing connections |
Pneumatically
via tubing connections |
Electrically via
wire connections |
Mechanically via
cable connections |
| An auxiliary plant
on board a mobile offshore drilling unit that is invariably automated is
the compressed air plant. Suppose the air compressors of such a plant are
configured for lead-lag operation as shown in the illustration. If the sequence
selector station is configured for #1 compressor to be the lead compressor
and the #2 compressor to be the lag compressor, what statement is true?
Illustration GS-0188 |
#2 compressor
would be the "duty" compressor, cycling off and on when the system
demand for compressed air is light, and #1 compressor would be the "standby"
compressor, cycling off and on only when the system demand for compressed
air is heavy. As a consequence, #1 compressor will accumulate more running
hours than #2 compressor. |
#2 compressor
would be the "duty" compressor, cycling off and on when the system
demand for compressed air is light, and #1 compressor would be the "standby"
compressor, cycling off and on only when the system demand for compressed
air is heavy. As a consequence, #2 compressor will accumulate more running
hours than #1 compressor. |
#1 compressor
would be the "duty" compressor, cycling off and on when the system
demand for compressed air is light, and #2 compressor would be the "standby"
compressor, cycling off and on only when the system demand for compressed
air is heavy. As a consequence, #1 compressor will accumulate more running
hours than #2 compressor. |
#1 compressor
would be the "duty" compressor, cycling off and on when the system
demand for compressed air is light, and #2 compressor would be the "standby"
compressor, cycling off and on only when the system demand for compressed
air is heavy. As a consequence, #2 compressor will accumulate more running
hours than #1 compressor. |
| Marine diesel
engine dry-type mufflers reduce noise by __________. |
using phase adjusters |
decreasing back
pressure at the exhaust manifold |
constant pulse
charging at the exhaust manifold |
allowing gases
to expand and change direction of flow |
| The vessel to
which you are assigned is fitted with a totally pneumatic propulsion control
system as shown in the illustration. If propulsion control functions perfectly
from the engine room control station, but will not function at all from
any of the remote stations, which of the following system faults best accounts
for these symptoms? Illustration MO-0168 |
The local/remote
transfer valve at the engine room control station has a blocked local port. |
The pilot house/remote
transfer valve at the pilot house has a blocked remote port. |
The attendance
valve at the pneumatic remote-control station has a blocked outlet port. |
The local/remote
transfer valve at the engine room control station has a blocked remote port. |
| The water-tube
natural-circulation steam boiler on your vessel is equipped with soot blowers
for maintaining heat transfer efficiency. Which of the following statements
best describes the conditions that must be met before tubes can be safely
blown using the soot blowers? |
The boiler draft
must be decreased AND the boiler fires must be secured before tubes can
be safely blown. |
The boiler draft
must be increased AND the boiler fires must be lit before tubes can be safely
blown. |
The boiler draft
must be increased AND the boiler fires must be secured before tubes can
be safely blown. |
The boiler draft
must be decreased AND the boiler fires must be lit before tubes can be safely
blown. |
| While underway
on a slow-speed propulsion diesel, the duty engineer is alerted to a high
scavenging air temperature at one cylinder. Which of the following could
be a possible cause? |
Blocked scavenging
air cooler. |
Scavenging air
box fire at the piston underside. |
Exhaust valve
leakage due to a burned seat. |
No water flow
to the turbo-charger after cooler. |
| You are observing
the flame condition on an oil-fired auxiliary boiler through an observation
window peep-hole. The flame is a reddish color accompanied by a noticeably
panting/pulsating furnace. What would be the correlating color of the gases
exhausting from the stack under these conditions? |
White smoke. |
Dense black smoke. |
Clear stack. |
Light brown haze. |
| Diesel engines
powering large vessels that directly drive fixed-pitch propellers are of
what type? |
Medium-speed,
reversing engines |
Slow-speed, reversing
engines |
Medium-speed,
non-reversing engines |
Slow-speed, non-reversing
engines |
| What statement
below summarizes an engine lubricating oil's viscosity given as 20W-50? |
The "W"
designates what the additives are that are added to this oil. |
It is formulated
for hot summer days when the cooling water temp is 50 deg F higher than
the oil temperature. |
It is formulated
for both a low temperature and a high temperature based on viscosities determined
at 100 deg C. |
It is formulated
for a metric weight of 20 milligrams at 50 deg F. |
| When a slow-speed
diesel engine is used to directly drive a fixed-pitch propeller, upon execution
of a stop order and cutting off fuel delivery, if there is way on the ship
how is engine rotation stopped? |
In all cases,
start air is admitted to the engine in the opposite direction of rotation
until the engine stops rotating. |
In all cases,
the engine rotation is stopped by applying the shaft brake. |
In some cases,
a shaft brake is applied. In other cases, start air is admitted in the opposite
direction until the engine stops rotating. |
In all cases,
the engine is allowed to rotate until it eventually stops. |
| An excess pressure
governor is a special type of control device. On what equipment would an
excess pressure governor normally be found? |
main circulator
pump |
forced draft fan |
turbine-driven
feed pump |
low-pressure propulsion
turbine |
| As shown in the
illustration, what is the function of component "B"? Illustration
MO-0231 |
to heat the circulating
water so it will flash in the steam drum |
to generate superheated
steam to operate a turbo-generator |
to condense excess
steam produced in the boiler |
to maintain a
water level in the steam drum |
| On a slow speed,
crosshead type, diesel engine, in which application is the lubricating oil
considered a consumable? |
Turbocharger lubricating
oil |
Main circulating
oil |
Cylinder lubricating
oil |
Piston cooling
oil |
| Sludge tanks are
used in an oil lubricating system to receive __________. |
bilge slops that
can be reclaimed after clarification |
foreign liquid
matter, discharged from the lube oil purifier or the stripping pump |
makeup oil that
is to be added to the system after settling |
all of the oil
that passes through the lube oil coolers |
| With respect to
motors, how is ambient temperature defined? |
amount of temperature
developed by an operating motor |
temperature of
the compartment where the motor is located |
amount of temperature
rise with no load |
normal operating
temperature, less the room temperature |
| You are inspecting
the blower of a Roots-blown, two-stroke cycle main propulsion engine on
the anchor-handling supply vessel to which you are assigned and discover
the presence of aluminum dust on the rotors and on the air duct surfaces.
What would most likely be the direct cause of this? |
Worn blower rotor
shaft bearings. |
Worn blower rotor
shaft seals. |
Restricted scavenging
air intake ports. |
Restricted blower
air intake filter. |
| The platform construction
support vessel to which you are assigned has a deck winch drive engine fitted
with fuel injectors with the operating principle as shown in the illustration.
In figure "A" which plunger travel position corresponds to when
fuel injection begins? Illustration MO-0144 |
1 |
2 |
3 |
4 |
| You are serving
as an engineer onboard a mollusc dredger equipped with main propulsion diesel
engines of the type shown in the illustration. What scavenging flow pattern
is used in this engine type? Illustration MO-0122 |
Uniflow |
Loop |
Cross-flow |
Return-flow |
| You are assigned
as an engineer on an uninspected fishing industry vessel using main propulsion
engines of the type shown in the illustration. Assuming that the piston
is properly positioned, what statement represents the procedure for inspection
of the compression rings while in place inside the engine? Illustration
MO-0005 |
The inspection
takes place by removing the appropriate crankcase access door and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate cylinder head valve cover and viewing
through the resulting opening. |
The inspection
takes place by removing the appropriate side cover and viewing through the
resulting opening. |
It is not possible
to inspect the compression rings while in place inside the engine. |
| The various auxiliary
diesel engines fitted on your uninspected fishing trawler may employ a variety
of different cranking methods for engine starting. What type of cranking
method is shown in the illustration? Illustration MO-0044 |
Electric cranking
motor. |
Gasoline engine
cranking motor. |
Hydraulic cranking
motor. |
Air cranking motor. |
| The fishing seiner
to which you are assigned has a pneumatic propulsion control system as shown
in the illustration. When the mechanical slave remote control station is
being used to control propulsion, what is the direct result of positioning
the control lever in the ahead direction? Illustration MO-0168 |
Movement of the
mechanical slave remote control station lever directly shifts the clutch
actuator 4-way control valve to the ahead direction by the action of a chain
or cable. |
Movement of the
mechanical slave remote control station lever directly shifts the engine
room control station lever control valve spool by the action of a chain
or cable which results in pneumatic shifting of the clutch actuator 4-way
control valve to the ahead direction. |
Movement of the
mechanical slave remote control station lever directly shifts the pneumatic
remote control station lever control valve spool by the action of a chain
or cable which results in pneumatic shifting of the clutch actuator 4-way
control valve to the ahead direction. |
Movement of the
mechanical slave remote control station lever directly shifts the pilot
house pneumatic master control station lever control valve spool by the
action of a chain or cable which results in pneumatic shifting of the clutch
actuator 4-way control valve to the ahead direction. |
| You are replacing
a damaged high pressure fuel injection line for #1 cylinder on an auxiliary
diesel engine onboard your fishery research vessel. Which of the following
statements represents the best replacement practice or strategy? |
Replace the damaged
fuel injection line with a factory-formed fuel injection line specifically
fabricated for #1 cylinder line replacement. |
Replace the damaged
fuel injection line with a custom fabricated line without regard to the
length and configuration of the bends of the original. |
Custom fabricate
the fuel injection line minimizing length and bends to create the shortest
possible replacement fuel injection line. |
Custom fabricate
the fuel injection line as close as possible to the fuel injection line
being replaced in terms of bends and overall length. |
| The main propulsion
diesel engines used to power the fishing vessel to which you are assigned
are started with vane-type air-starting motors designed to operate at 250
psig. The in-line lubricator should provide 3 drops of oil per cranking
minute, as long as the in-line lubricator oil viscosity is as specified.
If the start air pressure is within the normal range and the oil viscosity
is correct, but the oil injection rate is only 1 drop per minute, what should
be done? |
The oil in the
in-line lubricator should be replaced with oil of lower viscosity than specified. |
The in-line lubricator
oil injection metering needle valve should be further opened. |
The in-line lubricator
oil injection metering needle valve should be further closed. |
The starting air
pressure supplied to the air-starting motors should be increased. |
| The main engines
on your fishery research vessel utilize a starting system similar to that
shown in the illustration. The air supply pressure and engine room ambient
temperatures are both within the normal range. Upon attempted start-up,
the engine turns very slowly, and the flow rate of air from the air starting
motor exhaust is very low. Which of the listed conditions would most likely
be the cause of the failure to start? Illustration MO-0203 |
The air-starting
motor vanes are stuck in their slots. |
The in-line lubricator
siphon tube is severely restricted. |
The fuel injection
system piping is air-bound. |
The in-line strainer
basket element is severely restricted. |
| A deck winch drive
engine fuel system on board your uninspected fishing industry vessel is
prone to becoming air bound, and you suspect a fuel system piping leak.
Assuming that the diesel fuel tank is beneath the engine, that the fuel
booster pump is engine driven, and that the fuel injection pump is a high
pressure multi-plunger pump, where in the system would the leak most likely
exist? |
In the fuel injection
pump return line between the fuel injection pump return outlet and the fuel
oil day tank (or booster pump suction as appropriate). |
In the booster
pump discharge line between the booster pump outlet and the fuel injection
pump inlet. |
In the fuel injection
pump high pressure fuel lines between the fuel injection pump high pressure
outlets to the fuel injector nozzle inlets. |
In the booster
pump suction line between the day tank suction line and the booster pump
inlet. |
| In order to minimize
the abrasive action of dust particles entering the combustion spaces of
the diesel engines used on the fishery research vessel to which you are
assigned, each engine is protected with a heavy-duty air intake filter.
Which one of the listed air intake filter elements is periodically cleaned
as opposed to being periodically replaced with a new element? |
Panel-type filter
element. |
Wire-mesh filter
element. |
Multi-tube filter
element. |
Spiral-rotor filter
element. |
| The turbocharged,
four-stroke, main propulsion diesel engines on your fishery research vessel
are protected with dry-type air intake filters. The engines are fitted with
dial-type restriction indicators measuring the pressure in the air duct
between the air intake filter and the turbocharger blower inlet. Under what
conditions should the air intake filters be evaluated using the restriction
indicators? |
The engine should
be running at idle RPM with no load (propulsion clutch disengaged). |
The engine should
be running at idle RPM with minimal load (propulsion clutch engaged). |
The engine should
be running at rated RPM with no load (propulsion clutch disengaged). |
The engine should
be running at rated RPM with full load (propulsion clutch engaged). |
| Assuming the use
of low sulfur content diesel fuel, what combination of conditions associated
with uninspected fishing industry vessel engine room operations would most
contribute to internal corrosion of exhaust systems? |
High ambient temperature
and low engine load. |
Low ambient temperature
and high engine load. |
High ambient temperature
and high engine load. |
Low ambient temperature
and low engine load. |
| The raw water
boxes of the fresh water coolers serving the main propulsion diesel engines
on your uninspected fishing industry vessel are fitted with sacrificial
zinc anodes. Upon inspection, at what percentage of deterioration should
the zinc anodes be replaced? |
25% |
50% |
75% |
100% |
| A turbocharged,
two-stroke cycle main propulsion diesel engine on your fishery research
vessel is emitting gray to black smoke excessively from the stack. Upon
comparing the measured air box pressure against a reference engine which
is producing a clear stack, the measured air box pressure is determined
to be too low. Which of the following conditions would most likely be the
cause for the relatively low air box pressure? |
Exhaust silencer/muffler
is excessively restricted with carbon deposits. |
Turbocharger exhaust
turbine inlet screen is excessively restricted. |
Scavenging air
intake ports are excessively restricted with carbon deposits. |
Airside aluminum
fins on after coolers are excessively restricted. |
| You are inspecting
the blower of a Roots-blown, two-stroke cycle main propulsion engine on
the fishing vessel to which you are assigned and discover the presence of
aluminum dust on the rotors and on the air duct surfaces. What would most
likely be the direct cause of this? |
Worn blower rotor
shaft bearings. |
Restricted scavenging
air intake ports. |
Restricted blower
air intake filter. |
Worn blower rotor
shaft seals. |
| The uninspected
fishing industry vessel to which you are assigned is fitted with reversing
reduction gears equipped with airflex pneumatic tire-type friction clutches.
With the bridge in control of the main engines, you hear unusual screeching
noises coming from the clutches, but only when transitioning from one direction
to the other. Given the situation of changing direction from ahead to astern
as an example, what is the most likely cause? |
The EOT handle
is being left in ahead idle and then in neutral for too long a period of
time. |
The EOT handle
is being left in neutral and then in astern idle for too long a period of
time. |
The EOT handle
is being left in neutral and then in astern idle for too short a period
of time. |
The EOT handle
is being left in ahead idle and then in neutral for too short a period of
time. |
| The fishing vessel
to which you are assigned is fitted with a totally pneumatic propulsion
control system as shown in the illustration. If the astern clutch fails
to engage from all control locations, but the ahead clutch properly engages
from all control locations, which of the following system faults best accounts
for these symptoms? Illustration MO-0168 |
The control lever
at the pneumatic remote control station has a blocked astern clutch engagement
pilot port. |
The astern clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
The control lever
at the engine room control station has a blocked astern clutch engagement
pilot port. |
The ahead clutch
engagement pilot air tubing has separated from the clutch actuator 4-way
control valve at the clutch control panel. |
| The rated speed
of the main propulsion diesel engines on your uninspected fishing industry
vessel is 900 rpm. The installed centrifugal over speed trip device similar
to the one shown in the illustration is designed to shutdown the engine
at 110% of rated speed. Upon testing the over speed trip device, you determine
that the actual shutdown occurs at 945 rpm. Which of the following would
account for this? Illustration MO-0101 |
The throw-out
weight (item #10) pivot bolt (not labeled) is binding within the counterweight
(item 1 through 9) drilling. |
The compression
spring (item #12) was excessively compressed when the over speed trip was
last set. |
The throw-out
weight (item #10) link bolt (item #15 & #16) is binding within the spring
guide (item #14) drilling. |
The jam nut was
not properly tightened against the adjusting nut (items #13) when the over
speed trip was last set. |
| Using the oil
chart provided in the illustration for guidance, which of the oils listed
below would provide the best protection against high governor oil operating
temperatures for speed control applications for fishing industry main propulsion
diesel engines? Illustration MO-0161 |
Mobil 1 (Synthesized
Hydrocarbon) |
DN600 (Hydrocarbon) |
All Proof 10W50
(Polyolester) |
Delvac I (Synthesized
Hydrocarbon) |
| While underway
in open waters on your commercial crabbing vessel, the low clutch air pressure
alarm sounds and the faint odor of burning rubber is detected. What is the
appropriate response? |
Bring the throttle
and clutch control to the stop position, then investigate the cause of low
clutch air pressure. |
Investigate the
cause of low clutch air pressure, then bring the throttle and clutch control
to the stop position if necessary. |
Reduce the load
and speed on the engine, then investigate the cause of low clutch air pressure. |
Investigate the
cause of low clutch air pressure, then reduce the engine load and speed
if necessary. |
| For diesel engines,
such as those used for main propulsion and auxiliary power on fishery research
vessels, while running at speed, how is the ignition of fuel within the
cylinder achieved? |
Ignition is achieved
by the heat of compression created by compressing the air/fuel mixture within
the cylinder into a relatively small volume. |
Ignition is achieved
by a high voltage electric spark induced across the gap of a specially designed
spark plug. |
Ignition is achieved
by intense heat by passing electric current through the element of a specially
designed glow plug. |
Ignition is achieved
by the heat of compression created by compressing intake/charge air within
the cylinder into a relatively small volume. |
| When checking
the crankcase oil level on a main propulsion engine on your fishing industry
line vessel while underway, what should be the oil level as indicated on
the dipstick? |
The actual level
is unimportant as long as it is visible on the dipstick when the engine
is running. |
The level should
be below the ADD mark on the side of the dipstick marked with engine IDLE
and oil HOT. |
The level should
be between the FULL and ADD marks on the side of the dipstick marked with
engine IDLE and oil HOT. |
The level should
be well above the FULL mark on the side of the dipstick marked with engine
IDLE and oil HOT. |
| When starting
a deck winch drive engine in preparation for seine net handling operations,
what parameter must be checked FIRST upon start-up to avoid immediate engine
damage? |
Cylinder jacket
water pump discharge pressure. |
Engine lubricating
oil supply header pressure. |
Winch gear oil
pump discharge pressure. |
Fuel oil supply
header pressure. |
| The deck winch
drive engine onboard your fishing seiner uses a lubricating oil filtration
scheme as shown in the illustration. What type of filtration system is illustrated?
Illustration MO-0182 |
Full-flow filtration. |
Bypass filtration. |
Sump filtration. |
Shunt filtration. |
| The main propulsion
engines onboard your fishery research vessel use a lubricating oil system
as shown in the illustration. Under what circumstances will the turbo soak-back
pump operate? Illustration MO-0186 |
It will operate
at all times while the engine is running. |
It will run for
period of time before engine start-up and after engine shutdown. |
It will run for
a period of time prior to engine start-up only. |
It will run for
a period of time after engine shutdown only. |
| The main diesel
engines on the uninspected fishing industry vessel to which you are assigned
are fitted with a metal-edge duplex suction fuel strainer, where the elements
must be periodically cleaned. The engine manufacturer recommends using a
petroleum based solvent for cleaning. Which of the following would typically
be acceptable? |
Kerosene or diesel
fuel. |
Benzene or toluene. |
White mineral
spirits. |
Perchlorethylene
or trichlorethylene. |
| The manufacturer
of the main propulsion diesel engines on your uninspected fishing trawler
specifies the requirements for total hardness of fresh water makeup for
the closed, recirculating fresh water cooling system in milligrams per liter
(mg/L). If the fresh water test reported a total hardness of 5.7 grains
per gallon (gpg), using the conversion chart of the illustration, what would
be the total hardness in mg/L? Illustration MO-0208 |
0.333 mg/L |
0.9748 mg/L |
9.757 mg/L |
97.57 mg/L |
| In a closed, re-circulating
fresh water cooling system used for the main engines on your fishing industry
line vessel, what function would chemical treatment with molybdate primarily
perform? |
Freezing point
depression. |
Boiling point
elevation. |
Biological growth
inhibition. |
Corrosion inhibition. |
| The pneumatic
propulsion control system used on the fishing vessel to which you are assigned
uses a diaphragm-operated relay valve as shown in the illustration. Periodically,
the valve is to be disassembled for cleaning and inspection. What statement
best describes the proper method for lubrication upon reassembly? Illustration
MO-0052 |
O-rings should
be lubricated with penetrating oil. |
O-rings should
be lubricated with a silicone-based grease. |
O-rings should
be lubricated with desiccant powder. |
O-rings should
not be lubricated by any means. |
| The main engines
on your fishing industry line vessel are equipped with manual shutdown levers
as shown in the illustration. What statement concerning manual shutdown
is true? Illustration MO-0171 |
The manual shutdown
lever is operated by means of a remote pull cable and uses the over speed
trip mechanism to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of a remote pull cable and uses the governor
fuel control linkage to accomplish engine shutdown. |
The manual shutdown
lever is operated by means of the emergency trip reset lever and uses the
governor fuel control linkage. |
The manual shutdown
lever is operated by means of the over speed trip reset lever and uses the
over speed trip mechanism to accomplish engine shutdown. |
| The main diesel
propulsion engines on your uninspected fishing industry vessel are protected
with a mechanical over speed trip mechanism similar to that shown in the
illustration. Upon testing the trip setting, you discover that it is necessary
to make an adjustment. Assuming that several adjustments may be necessary
before the final setting is accurately achieved, what statement concerning
adjustment is true? Illustration MO-0101 |
To adjust the
over speed trip, the engine must be stopped AND the locknut must be retightened
only after the final adjustment. |
To adjust the
over speed trip, the engine must be stopped AND the locknut must be retightened
after each adjustment. |
To adjust the
over speed trip, the engine must be running AND the locknut must be retightened
after each adjustment. |
To adjust the
over speed trip, the engine must be running AND the locknut must be retightened
only after the final adjustment. |
| The deck winch
on your fishing industry seiner is fitted with a speed control governor
of the type shown in the illustration. In addition to variable governed
speed setting, what other group of settings is built into this particular
governor? Illustration MO-0157 |
Engine idle speed
(minimum governed speed) Engine speed limit (maximum governed speed) |
Engine idle speed
(minimum governed speed) Engine speed limit (maximum governed speed) Engine
load limit (maximum fuel delivery) |
Engine idle speed
(minimum governed speed) Engine load limit (maximum fuel delivery) |
Engine load limit
(maximum fuel delivery) Engine speed limit (maximum governed speed) |
| The thermal fluid
heating oil system on your fishing industry factory ship is configured similarly
to that shown in the illustration. What system component performs expansion
and deaeration functions? Illustration MO-0198 |
1 |
2 |
4 |
5 |
| The water-tube
natural-circulation steam boiler on your fishing trawler is equipped with
soot blowers for maintaining heat transfer efficiency. Which of the following
statements best describes the conditions that must be met before tubes can
be safely blown using the soot blowers? |
The boiler draft
must be increased AND the boiler fires must be secured before tubes can
be safely blown. |
The boiler draft
must be decreased AND the boiler fires must be secured before tubes can
be safely blown. |
The boiler draft
must be increased AND the boiler fires must be lit before tubes can be safely
blown. |
The boiler draft
must be decreased AND the boiler fires must be lit before tubes can be safely
blown. |
| When cleaning
burner atomizers associated with an oil-fired auxiliary boiler fitted on
your fishery research vessel, which of the following metals would be recommended
to use in fabricating a tool for the purposes of carbon removal? |
Titanium |
Tungsten |
Copper |
Chromoly steel |
| Valve lash or
clearance refers to the __________. |
clearance between
the top of the valve stem and the valve lifting mechanism. |
compression force
of the valve springs |
clearance between
the valve seat inserts and the valve head |
fuel injection
cam profile |
| Due to environmental
and safety concerns, the diesel engine cooling water system on your vessel
is treated with propylene glycol for protection against freezing. According
to the illustration, what would be the limit of protection if 40 pints of
propylene glycol are used in treating a cooling water system with a volumetric
capacity of 10 gallons? Illustration MO-0209 |
10°F |
-6°F |
-30°F |
-53°F |
| In a closed, re-circulating
fresh water cooling system used for the main engines on your vessel, what
function would chemical treatment with molybdate primarily perform? |
Corrosion inhibition. |
Freezing point
depression. |
Boiling point
elevation. |
Biological growth
inhibition. |
| The vessel's owners
have issued orders to reduce a motor vessel's speed to achieve a 10% reduction
of fuel, for an extended period of time. As the senior engineer on board,
what action should you take? |
Slow down to the
requested fuel consumption reduction and proceed as such until further notice. |
Request owner
to provide the vessel with engine manufacturer's slow speed steaming fuel
injector nozzles. |
Reduce the engine
RPM until a 10% reduction of consumption is achieved regardless of engine
combustion efficiency. |
Re-time the engine
to advance the fuel injection to maintain combustion efficiency. |
| An auxiliary diesel
engine on your towboat is equipped with an electric starting motor such
as is shown in the illustration. For what reason is there a significant
gap in distance between the start solenoid plunger (C) and the rod that
is used to close the starter motor contacts. Illustration MO-0051 |
Upon starter solenoid
coil energization, this gap delays the engagement of the pinion to the flywheel
ring gear until after the starter motor contacts close. |
Upon starter solenoid
coil energization, this gap delays the closure of the starter motor contacts
until after engagement of the pinion to the flywheel ring gear. |
Upon starter solenoid
coil energization, this gap compensates for starter motor armature reaction
to minimize arcing at the brushes. |
Upon starter solenoid
coil energization, this gap prevents chattering and associated arcing of
the starter motor contacts. |
| The main engines
on your harbor tug utilize a starting system with two air-start motors similar
to that shown in the illustration. Upon pushing the start button, the solenoid
air valve energizes open, but the air start relay valve fails to receive
pilot air, and thus the starter motors and engine fail to rotate. Which
of the listed conditions would most likely be the cause of the failure to
start? Illustration MO-0200 |
The upper pinion
fails to retract, which in turn does not allow the lower pinion to retract.
Because retraction of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The upper pinion
fails to engage, which in turn does not allow the lower pinion to engage.
Because engagement of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The lower pinion
fails to retract, which in turn does not allow the upper pinion to retract.
Because retraction of both pinions is required to supply air to the air-start
motors, the engine does not start. |
The lower pinion
fails to engage, which in turn does not allow the upper pinion to engage.
Because engagement of both pinions is required to supply air to the air-start
motors, the engine does not start. |
| The diesel fuels
burned in auxiliary and main diesel engines of tugboats operating in harbor
areas are required to meet certain specifications. Among these are limits
of certain contaminants to limit atmospheric emissions to acceptable levels.
Which of the following soluble contaminants is applicable? |
Asphaltenes |
Sulfur |
Total sediment |
Water |
| The tractor tug
to which you are assigned has diesel generators fitted with multi-plunger
pumps with the metering principle as shown in the illustration. What statement
is true concerning this injection pump type? Illustration MO-0145 |
As the load changes,
the beginning of injection is constant, and the ending of injection is constant. |
As the load changes,
the beginning of injection is variable, and the ending of injection is constant. |
As the load changes,
the beginning of injection is variable, and the ending of injection is variable. |
As the load changes,
the beginning of injection is constant, and the ending of injection is variable. |
| The main propulsion
diesel engines on your ship-docking tug are fitted with conventional hydraulically
operated injector nozzles of the orifice type. When testing an injector
by performing a pop-test on an injector test stand, you observe no leakage
prior to reaching the popping pressure, the pressure holds at just below
the popping pressure, the actual popping pressure is within specification,
but the spray pattern is distorted. What maintenance is required? |
The injector spindle
and nozzle holder bore must be reconditioned or replaced. |
The injector needle
valve and seat must be reconditioned or replaced. |
The injector spring
compression must be readjusted or a broken spring replaced. |
The injector nozzle
tip orifices must be reconditioned by cleaning or the tip replaced. |
| You suspect that
a diesel generator set on your river push boat has a misfiring cylinder
because the engine, although warm, is running roughly. The six-cylinder
engine is fitted with a multi-plunger in- line high pressure fuel injection
pump with hydraulically operated injector nozzles. When you slacken the
high pressure fuel line fitting at No. 5 fuel injector nozzle, the engine
continues to run roughly as before with no real change. Upon re-tightening
the high pressure fuel line fitting, the engine begins and continues to
run smoothly. What does this indicate? |
No. 5 cylinder
was and continues to be misfiring. You have successfully located the misfiring
cylinder. |
No. 5 cylinder
was and continues to be firing properly. No. 1, No. 2, No. 3, or No. 4 cylinder
is misfiring. No. 6 cylinder is firing properly. |
No. 5 cylinder
was and continues to be firing properly. No. 6 cylinder is misfiring. No.
1, No. 2, No. 3, and No. 4 cylinders are all firing properly. |
No. 5 cylinder
had been misfiring. You have successfully purged the air from the No. 5
cylinder high pressure fuel line, and the engine is no longer misfiring. |
| The towboat to
which you are assigned has main diesel engines fitted with intake and exhaust
systems as shown in the simplified illustration. What is the primary purpose
of the intercooler? Illustration MO-0180 |
Increase the charge
air density to increase the engine power output. |
Provide cooling
to the turbocharger turbine. |
Provide cooling
to the turbocharger blower. |
Eliminate the
need for water jacketing of the exhaust receiver. |
| The diesel generator
set drive engines on your river push boat are protected with heavy-duty
oil bath air cleaners. The oil within these air cleaners should be periodically
replaced in accordance with manufacturer recommendations. What statement
best describes when it would be appropriate to deviate from the recommended
frequency? |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
more frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil more frequently when
the oil is unusually dirty or when it thickens. |
Replace the oil
less frequently when the engine is exposed to dusty conditions (such as
arc welding in the engine room), and replace the oil less frequently when
the oil is unusually dirty or when it thickens. |
| The diesel engines
on your tug are all protected with dry-type air filters. When changing filter
elements what visual indication would cause you to suspect that the engine
has been contaminated with dust as the result of improperly sealing of the
filter element gasket? |
The "dirty"
side of the air filter element is coated with dust. |
The "dirty"
side of the air filter housing is coated with dust. |
The "clean"
side of the air filter element is clean and free of dust. |
The "clean"
side of the air filter element is streaked with dust. |
| The salvage tug
to which you are assigned has main engines fitted with intake and exhaust
systems as shown in the illustration. Assume that the typical cylinder exhaust
temperature at 75% of maximum, continuous rated load is between 850° and
900 ° F. What will happen to the typical cylinder exhaust temperature when
the load is increased to 100% of maximum continuous rated load? Illustration
MO-0076 |
The temperature
will increase. |
The temperature
will not change. |
The temperature
will decrease. |
The temperature
will change, but in either direction. |
| A main propulsion
diesel engine on your towing vessel produces gray to black smoke under virtually
all load conditions as observed at the stack. The heavier the load on the
engine, the darker the smoke becomes. What condition would most likely account
for this? |
Leaking exhaust
manifold cooling water jackets. |
Excessively worn
exhaust valve guides. |
Leaking exhaust
piping expansion joints. |
Excessively restricted
exhaust silencer/muffler. |
| The fresh water
cooling systems serving the main engines on your harbor tug are arranged
as shown in the illustration. If the fresh water thermostatic control valve
fails in the position where 100% of the flow from flange "A" is
permanently ported to flange "B" and flange "C" is permanently
blocked, while starting and warming the engine with no load, what would
be the resulting warm up time period? Illustration MO-0137 |
With no load,
it is not possible to describe the time frame required to warm up the engine. |
With no load,
the engine would require a relatively normal time frame to warm up. |
With no load,
the engine would require a much longer than normal time frame to warm up. |
With no load,
the engine would require a much shorter than normal time frame to warm up. |
| The lubricating
oil system supporting the main propulsion reduction gear on the ship-docking
tug to which you are assigned is fitted with a lube oil strainer as shown
in the illustration. What strainer attribute will dictate the degree of
filtration in terms of the particle size capable of being filtered? Illustration
MO-0057 |
The number of
discs in the disc-stack making up the straining element. |
The length of
the oil sump enclosing the straining element. |
Vertical spacing
between the metal discs as determined by the thickness of the cleaner blades. |
The dimensions
of the triangular oil passages in each disc conveying the strained oil upward. |
| The escort tug
to which you are assigned is fitted with hydraulic clutches similar to that
shown in the illustration. If the time required for the clutch to disengage
is unacceptably long, which of the following conditions would most likely
be responsible for this? Illustration MO-0089 |
Solid contaminants
are present in the hydraulic fluid. |
Clutch operating
fluid is maintained at too low a temperature. |
Clutch operating
fluid is maintained at too high a temperature. |
Fluid clutch sump
level maintained at too high a level. |
| The main engines
on your articulated tug-barge unit are equipped with over speed trip devices
as shown in the illustration. What statement concerning the operation of
the over speed trip is true? Illustration MO-0171 |
The overspeed
trip senses centrifugal force proportional to engine speed and shuts the
engine down at a pre-determined, specified maximum speed setting. |
The overspeed
trip senses centrifugal force proportional to engine speed and limits the
engine speed to the rated speed, while allowing the engine to continue to
run at the rated speed. |
The overspeed
trip senses oil pressure proportional to engine speed and shuts the engine
down at a pre-determined, specified maximum speed setting. |
The overspeed
trip senses oil pressure proportional to engine speed and limits the engine
speed to the rated speed, while allowing the engine to continue to run at
the rated speed. |
| You are observing
the flame condition on an oil-fired auxiliary boiler installed on your coast-wise
tug through an observation window peephole. The flame is a reddish color
accompanied by a noticeably panting/pulsating furnace. What would be the
correlating color of the gases exhausting from the stack under these conditions? |
White smoke. |
Dense black smoke. |
Light brown haze. |
Clear stack. |
| The harbor tug
to which you are assigned has main engines fitted with intake and exhaust
systems as shown in the illustration. What type of turbo-charging configuration
is used? Illustration MO-0076 |
Constant pressure
turbo-charging. |
Boost-controlled
turbo-charging. |
Pulse turbo-charging. |
2-stage turbo-charging. |
| You are preparing
to change the oil of the speed control governor on one of the main propulsion
diesel engines on your towing vessel. What statement is true concerning
the draining and flushing procedures? |
The governor oil
should be drained while the oil is cold and the governor should be flushed
with the heaviest grade of the same type of oil. |
The governor oil
should be drained while the oil is hot and the governor should be flushed
with the lightest grade of the same type of oil. |
The governor oil
should be drained while the oil is hot and the governor should be flushed
with the heaviest grade of the same type of oil. |
The governor oil
should be drained while the oil is cold and the governor should be flushed
with the lightest grade of the same type of oil. |
| The pneumatic
propulsion control system used on your river pushboat uses a diaphragm-operated
relay valve as shown in the illustration. Periodically, the valve is to
be disassembled for cleaning and inspection. What statement best describes
the proper technique? Illustration MO-0052 |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be washed with soap and water. |
Rubber parts such
as the diaphragm should be cleaned with non-flammable solvent, and metal
parts such as the valve discs and seats should be washed with soap and water. |
Rubber parts such
as the diaphragm should be washed with soap and water, and metal parts such
as the valve discs and seats should be cleaned with non-flammable solvent. |
Rubber parts such
as the diaphragm and metal parts such as the valve discs and seats should
all be cleaned with non-flammable solvent. |
| You are serving
as a designated duty engineer onboard a harbor tug equipped with main propulsion
diesel engines of the type shown in the illustration. What scavenging flow
pattern is used in this engine type? Illustration MO-0227 |
Uniflow |
Return-flow |
Loop |
Cross-flow |
| The main propulsion
diesel engines fitted on your salvage tug are started with compressed air
using the system illustrated. What is the starting method used with this
system? Illustration MO-0199 |
Hydraulic cranking
motor(s) with air over hydraulics |
Direct air admission
with air start distributor |
Direct air admission
with cam actuated air start valves. |
Air cranking motor(s) |
| The main propulsion
engines onboard your tractor tug use a lubricating oil system as shown in
the illustration. What item number represents the lubricating oil filter?
Illustration MO-0183 |
2 |
5 |
10 |
12 |
| The harbor tug
to which you are assigned has diesel generators fitted with intake and exhaust
systems that includes the device as shown in figure "A" of the
illustration. What is the name of this device? Illustration MO-0178 |
Exhaust gas-driven
turbocharger |
Engine-driven
vane type rotary blower |
Engine-driven
lobe type rotary blower |
Electric motor-driven
centrifugal blower |
| Your salvage tug
is fitted with cooling water systems serving the main propulsion diesel
engines as shown in the illustration. Which heat exchanger/cooler application
and aspect would most likely require periodic mechanical cleaning with a
specially designed brush? Illustration MO-0137 |
The outside of
the tubes of the RW/FW heat exchanger. |
The inside of
the tubes of the RW/FW heat exchanger. |
The outside of
the tubes of the lube oil cooler. |
The inside of
the tubes of the lube oil cooler. |
| The ship-docking
tug to which you are assigned is fitted with main propulsion engines driving
through pneumatic airflex clutches as shown in the illustration. What statement
is true concerning this type of clutch? Illustration MO-0141 |
The clutch is
a constricting type clutch and constricts to engage against the clutch gland
when inflated. |
The clutch is
an expanding type clutch and expands to engage against the clutch drum when
inflated. |
The clutch is
an expanding type clutch and expands to engage against the clutch gland
when inflated. |
The clutch is
a constricting type clutch and constricts to engage against the clutch drum
when inflated. |
| Which of the following
conditions best describes the reason for performing a bottom blow on an
auxiliary steam boiler as fitted on your harbor tug? |
Priming and carryover. |
Sludge removal. |
High water. |
Excess chemicals
and/or salinity. |
| In accordance
with 46 CFR Subchapter F, what device is used as a safety feature for the
unit shown in the illustration? Illustration MO-0116 |
Spring clutch |
Overrunning clutch |
Pneumatic three
position valve |
Electrical limit
switch |
| Crankcase explosions
in propulsion diesel engines can result from which of the following? |
the splashing
of lubrication oil by the crankshaft |
the dilution of
crankcase oil with particles of combustion |
broken fuel lines
spraying oil on the crankcase |
the ignition of
vaporized lube oil in the crankcase |
| Prior to starting
an auxiliary diesel engine on your vessel, the crankcase oil level must
be checked. At what checked level would you be required to add make-up oil? |
When the oil level
drops to between the ADD and FULL marks on the dipstick. |
When the oil level
drops below the FULL mark on the dipstick. |
When the oil level
drops below the ADD mark on the dipstick. |
When the oil level
drops to where it is no longer visible on the dipstick. |
| The component
labeled as part No.20 in the illustration is used to __________. Illustration
MO-0050 |
meter the amount
of oil flow to the cylinder lubricating quill |
adjust the timing
of the cylinder lubricating oil to the cylinder |
indicate the quantity
of oil flow to the cylinder |
prevent the backflow
of oil and combustion gases |
| The vessel to
which you are assigned has a main engine fuel system as shown in the illustration.
Besides preventing the attached fuel oil pump and the hand priming fuel
oil pump from discharging through the other, what other purpose do the anti-flood
check valves serve? Illustration MO-0152 |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located below the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is running and when
the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shut down and
when the day tank is located above the engine. |
They prevent backflow
of fuel from the engine to the day tank when the engine is shut down and
when the day tank is located below the engine. |
| The vessel to
which you are assigned is fitted with a diesel driven generator engine as
shown in the illustration. What statement is true in terms of the combustion
chamber design? Illustration MO-0006 |
The engine uses
turbulence chambers with a hemispherical fire-deck. |
The engine uses
an open type combustion chamber with a hemispherical fire-deck. |
The engine uses
pre-combustion chambers with a flat fire-deck. |
The engine uses
an open type combustion chamber with a flat fire-deck. |
| What is the purpose
of water transducers used with the separator shown in the illustration?
Illustration MO-0127 |
A transducer is
located inside the separator to assist in adjustment of the water and oil
interface. |
A transducer is
located in the dirty oil inlet to measure the amount of water coming into
the separator with the process fluid. |
A transducer is
located in the clean oil outlet to sense water content in the oil. |
All of the above
are correct. |
| The hunting of
a diesel engine may be caused by which of the following? |
Poor quality fuel. |
Excessive governor
control. |
Fluctuations in
load. |
Excessive speed
droop. |
| The vessel to
which you are assigned has diesel generators fitted with intake and exhaust
systems as shown in the illustration. What statement is true concerning
the valves (items #1 and #9)? Illustration MO-0176 |
Both items #1
and #9 are intake valves. |
Item #1 is an
exhaust valve and item #9 is an intake valve. |
Item #1 is an
intake valve and item #9 is an exhaust valve. |
Both items #1
and #9 are exhaust valves. |
| Lube oil pumps
taking suction from the sump of most small marine engines are usually __________. |
diaphragm type |
centrifugal type |
positive displacement
type |
eductor type |
| Auxiliary diesel
engines can be automatically shut down as a result of __________. |
low lube oil temperature |
low lube oil pressure |
high exhaust temperature |
high cooling water
pressure |
| When a generator
diesel engine is operated at partial load, as compared to full load, a decrease
will occur in the average __________. |
piston speed |
fuel injection
pressure |
combustion pressure
on the power stroke |
compression pressure
on the compression stroke |
| An auxiliary diesel
generator continues to run after you try to shut down. Your next course
of action should be to __________. |
block the flow
of air supply to the engine |
engage the jacking
gear |
secure the lube
oil pump |
decrease control
air pressure |
| What is the best
way of stopping an over speeding diesel engine? |
Disconnect the
battery cables from the starting motor. |
Drain the hydraulic
fluid from the governor sump. |
Block the flow
of cooling air to the radiator. |
Secure the fuel
supply and block the air intake |
| Which of the listed
conditions will result in the failure of an auxiliary diesel engine to shut
down? |
Supplying high
temperature inlet air. |
Maintaining a
high exhaust back pressure. |
Lube oil entering
in the air intake manifold. |
Carbon buildup
on the over speed pawl. |
| In the auxiliary
diesel engine, shown in the illustration, the __________. Illustration MO-0006 |
governor is linked
to the fuel injection pump by vertical linkage |
explosion relief
doors are clearly visible on both sides of the crankcase |
camshaft rotates
at the same speed as the crankshaft |
engine oil filter
is outboard of the electric starter |
| Which of the following
test indicators should be considered the most significant factor in determining
as to whether or not a diesel generator's lube oil should be drained and
renewed? |
The oil appears
black in color. |
An extremely high
neutralization number. |
An extremely low
precipitation number. |
An increase in
flash point. |
| The valve cam
slope angle determines the __________. |
engine torque
characteristics |
acceleration rate
of valve opening and closing |
engine fuel efficiency |
diameter of intake
and exhaust valves |
| When two cams
of the same diameter, one with tangential flanks and the other with convex
flanks are compared, the cam with tangential flanks will cause___________. |
less valve seat
wear |
greater valve
lift |
more abrupt valve
action |
less valve gear
wear |
| The part labeled "G",
as shown in the illustration, is a __________. Illustration MO-0040 |
connecting rod
cap |
bearing shell |
connecting rod
bushing |
piston bushing |
| In diesel engines,
hydraulic valve lifters are used to __________. |
obtain greater
valve lift |
create longer
valve duration |
reduce valve gear
pounding |
increase valve
operating lash |
| The intake and
exhaust valves used in a diesel engine are returned to their seats by __________. |
combustion pressure |
push rod pressure |
exhaust pressure |
spring force |
| Before any auxiliary
diesel engine hydraulic starting system is opened for servicing or repair,
you must __________. |
bleed off all
hydraulic pressure from the system |
place all control
levers in the 'HOLD' position |
block all hydraulic
hoses using high pressure covers |
ensure that the
hydraulic fluid reservoir is full |
| The service life
of a worn aluminum piston for an auxiliary diesel, for which no spares are
readily available, can be extended by __________. |
knurling the piston
skirt surface |
increasing the
dimensions of the ring land grooves |
building up the
piston skirt with a liquid epoxy material and then remachining |
turning down the
piston skirt to concentric values |
| In an auxiliary
diesel engine, one reason for knurling the piston skirt is to __________. |
improve skirt
lubrication |
transmit forces
evenly |
allow for heat
expansion |
improve the piston
seal |
A four-stroke
cycle auxiliary diesel engine fuel cam has shifted from its original position
during maintenance. To ensure correct timing of the fuel pump, the intake
and exhaust valves should be in what position when approaching top dead
center for injection? |
Intake and exhaust
valves closed |
Exhaust valve
open, intake valve closed |
Intake and exhaust
valves open |
Intake valve open,
exhaust closed |
| If an auxiliary
diesel engine equipped with an electric starting system cranks very slowly
after repeated attempts to start, the cause could be a/an __________. |
overheated motor
windings |
ring gear with
broken teeth |
low lube oil viscosity |
low compression
pressure |
| In a four-stroke/cycle
diesel engine, badly worn intake valve guides can cause excessive __________. |
cooling water
temperatures |
lube oil consumption |
exhaust pressure |
exhaust temperatures |
| On small diesel
engines, a noticeable decrease in the time interval between the replacement
of the lube filter cartridge indicates __________. |
excessive oil
temperature |
excessive oil
pressure |
dirty air filter |
piston ring blow-by |
| A diesel engine
may fail to start when being cranked, due to __________. |
insufficient compression |
high cetane number |
low lube oil viscosity |
high lube oil
pressure |
| High exhaust temperature
and black smoke exhausting from an auxiliary diesel engine can be caused
by __________. |
plugged fuel nozzle
holes |
excessive compression
pressure |
engine overload |
low combustion
temperature |
| One remedy for
a high firing pressure, in addition to a high exhaust temperature in one
cylinder of a diesel engine, is to __________. |
adjust the fuel
rack |
retard fuel injector
timing |
reduce fuel booster
pump pressure |
increase scavenge
air pressure |
