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New Motor Plants II Questions from 25 Sept 2012


1

A built-up exhaust valve is one in which .

the stem and head is made of different materials

low-alloy steel is used throughout

a replaceable sleeve is shrunk on the valve stem

the valve requires double springs

2

A burned exhaust valve may be detected by a higher than normal .

firing pressure

exhaust temperature from a particular cylinder

cooling water temperature

compression pressure

3

A burner producing black smoke in an automatic auxiliary boiler, would be caused by a/an .

incorrect electrode setting

defective solenoid valve

grounded high tension lead

incorrect primary air setting

4

A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a .

defective solenoid valve

dirty fuel nozzle

grounded high tension lead

faulty ignition cable connector

5

A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler .

corrosion at low engine loads

erosion at high engine loads

overload at low engine loads

scaling at all exhaust temperatures

6

A change in engine speed is required before a governor is able to make a corrective movement of fuel rack. This aspect of governing is commonly expressed as a percent and is known as .

governor sensitivity

governor promptness

speed droop

isochronous governing

7

A coil-type automatically fired auxiliary boiler is to be laid up wet for an indefinite period. The boiler water should be treated to ensure that .

the manufacturer's recommended pH is maintained

there is no excess of oxygen scavenging chemicals

sludge formation cannot occur in the steam separator

waterside blow down will not be required

8

A continuous fluctuation of the speed, due to over control by the governor, is known as .

hunting

sensitivity

promptness

speed droop

9

A controllable pitch propeller on a diesel driven vessel eliminates the need for .

friction clutches

disconnect clutches

reversing gears

reduction gears

10

A dark exhaust from a running diesel engine can be caused by .

late ignition

water in the fuel

high compression temperature

starting valve stuck open

11

A diesel engine emits blue exhaust smoke as a result of .

cold intake air

excessive compression pressure

excessive cylinder lubrication

a light load

12

A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and the speed remaining below normal. The probable cause is .

engine overload

leaky valves

stuck or broken piston rings

low air injection pressure

13

A diesel engine is equipped with an isochronous hydraulic governor. A decrease in load will cause the engine speed to .

decrease only

increase only

decrease slightly then returned to original speed

increase slightly then returned to original speed

14

A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?

0.30 to 1

3.00 to 1

3.33 to 1

33.0 to 1

15

A diesel engine is operating under a normal load with low firing pressures and high exhaust temperatures. The most probable cause of this condition is .

a missing air intake filter

a restricted exhaust manifold

the fuel rack being too far in

the fuel rack being too far out

16

A diesel engine is operating with excessively high exhaust temperatures at all cylinders. To correct this condition, you should FIRST .

reduce the engine load

increase the cooling water flow

increase the lube oil pressure

adjust the fuel rack

17

A diesel engine is supercharged in order to .

lower the no-load RPMs

provide more air for combining with the fuel

increase the no-load RPMs

provide more fuel for combining with the air

18

A diesel engine is warmed up and white vapor is noted in the exhaust, this could indicate .

excessive cylinder lubrication

a lugging engine

a leaking cylinder liner

overloading of one cylinder

19

A diesel engine may be hard to start if the .

air intake is restricted

engine is cranked too fast

vibration dampener is faulty

exhaust back pressure is low

20

A diesel engine may fail to start due to .

low air charge temperature

high cranking speed

excessive fuel dilution of lube oil

high compression pressure

21

A diesel engine should not be operated at low loads for long periods of time because .

heavy carbon deposits will buildup on the valves and in the exhaust

fuel dilution is increased at low load

exhaust valves may be damaged

all of the above

22

A diesel engine valve spring is under compression when the valve is . I. Open II. Closed

I only

II only

both I and II

neither I nor II

23

A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?

0.3 to 1

3.33 to 1

33 to 1

300 to 1

24

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 .

check air intake manifold pressure

calibrate the fuel pump rack settings

set the speed droop adjustment to zero

carefully check for binding in the governor linkage

25

A diesel generator has just been paralleled with an AC turbo generator, but the load can not be properly divided. This could be caused by .

an incorrect diesel generator governor speed droop adjustment

a faulty reverse power relay within the main circuit breaker assembly

unsynchronized isochronous load distribution adjustments

a different speed setting on each unit

26

A direct acting, pneumatically controlled governor for a diesel engine operates in a range of 10 to 50 psi. The fuel rack position is at 20 millimeters when the governor air pressure is 30 psi. If the governor air pressure changes to 20 psi, the fuel rack setting will change to .

13 millimeters

17 millimeters

22 millimeters

24 millimeters

27

A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by .

carbon on the register doors

a dazzling white atomizer flame

fluctuating pressure in the windbox

an unevenly shaped burner flame

28

A distorted furnace in a fire-tube auxiliary boiler may be the result of .

firing for extended periods in the low fire mode

overheating, due to waterside deposits

varying the water level above the crown sheet

carrying excessive alkalinity in the boiler water

29

A dry-type exhaust muffler clogged with soot, will cause .

low exhaust temperature

loss of engine power

burned intake valves

engine racing

30

A dry-type exhaust silencer clogged with soot, will cause .

low exhaust temperature

loss of engine power

burned intake valves

engine racing

31

A dry-type spark arrestor removes sparks from a diesel engine exhaust by .

increasing the linear velocity of the exhaust gases

changing directions of exhaust gas flow

decreasing the temperature of the exhaust gases

accelerating the exhaust gas through a reduced size orifice

32

A failure of any component of a flame safeguard control for an auxiliary boiler will result in .

a furnace explosion

automatic burner shutdown

uncontrolled firing

automatic restart

33

A failure to any component of a flame safeguard control for an automatically fired auxiliary boiler, will result in .

the prevention of automatic restart

an immediate furnace explosion

uncontrolled firing

automatic restart

34

A feed pump for an auxiliary boiler might lose suction if the .

boiler water level is low

feed water is too hot

boiler steam demand is low

feed water is too cold

35

A firebox explosion in an automatically fired auxiliary boiler may be the result of .

excessive purging before lighting off

insufficient trail for ignition period

a faulty transformer in the ignition circuit

insufficient purging before lighting off

36

A four-stroke, cycle, turbocharged, 1000 horsepower diesel engine has been operating under load. The load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperature. In response to this condition, you should .

reduce load

check your exhaust

adjust cooling water temperature

increase lube oil flow

37

A gear type flexible coupling is precision built for .

reduced torsional vibration and resonance

increased slip and maneuvering capability

high torque transmittal under limited misalignment conditions

low axial thrust transmission under minimal alignment irregularities

38

A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the .

pilot valve opening

compensating needle valve

compensating spring tension

accumulator spring tension

39

A large, low-speed, main propulsion diesel engine exhaust is designed to drain off .

rain water coming down the stack

seawater washing up exhaust pipes at the waterline

fuel oil due to leaky injector nozzles

condensed water vapor produced from the exhaust gases

40

A large, low-speed, main propulsion diesel engine is operating at 80% load and normal speed while the vessel is in calm seas. As the intensity of the seas increase, the engine speed governor maintains the same RPM, although the load indicator indicates an increase in load beyond its allowable limits. Which of the following actions should be taken?

Increase the load limit setting.

Decrease the load limit setting.

Increase engine RPM.

Ignore this situation as the engine can handle the load increase.

41

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the .

cylinder heads

exhaust valves

scavenging air

injectors

42

A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger 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?

Masked intake ports

Length of the piston skirt

Positive pressure from the blower

Lower liner seals

43

A loud clicking noise from the valve compartment of an operating diesel engine would indicate .

worn valve seats

worn main bearings

excessive valve clearance

weak rocker arm springs

44

A loud clicking noise occurring from within the valve compartment of an operating diesel engine would indicate .

worn valve seats

tight rocker arm springs

excessive valve clearance

weak rocker arm springs

45

A main propulsion diesel engine is fitted with a pneumatically actuated governor, having an operating range of 10 to 60 psig. The current fuel rack setting is 15 mm at 30 psig. If the air pressure to the governor is increased to 40 psig, the fuel rack setting will change to .

10 mm

14 mm

15 mm

20 mm

46

A naturally aspirated diesel engine at full throttle will have an intake manifold pressure .

slightly less than atmospheric pressure

approximately equal to exhaust manifold pressure at all times

that is widely fluctuating

constantly decreasing as engine load increases

47

A photoelectric cell installed in an automatically fired auxiliary boiler burner management system .

opens the burner circuit upon sensing a flame failure

detects a flame failure by monitoring radiant heat from glowing refractory

requires mechanical linkage to secure the burner fuel supply

must be bypassed at low firing rates

48

A properly adjusted safety valve for an auxiliary boiler will .

attain maximum lift when it pops below its set pressure

open with a sharp, clear pop at its set pressure

close sharply when the pressure drops to its set pressure

operate most effectively when it has zero blow down

49

A propulsion diesel engine, having a maximum continuous output of over 300 HP, and driving a controllable pitch propeller, must be fitted with a separate overspeed device, in addition to the normal governor. This second device is to prevent the engine from exceeding the rated speed by more than .

5%

10-15%

20%

25-30%

50

A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than the low end of the critical speed range. Which of the following statements describes what should be done to correct this malfunction?

Device 17A needs to be replaced, repaired, or reset to the set point coinciding with the RPM value for the low end of the critical speed range.

The critical speed range will be varied as the set points of 17A or 17B are reset, therefore, another segment of the speed control circuit must be repaired.

To increase the critical speed range of the engine, reduce the set point of 17A and 17B respectively, to .80 bar and 1.0 bar.

Both 17A and 17B need to be reset to decrease the critical speed range, although this procedure will increase the operating range of the engine.

51

A pulsating flame, accompanied by a burner developing black smoke in an auxiliary boiler, is an indication that the .

electrode setting is incorrect

ignition current is too low

fuel oil pressure is too low

fuel nozzle is correctly positioned

52

A pyrometer is an instrument commonly used to measure .

cylinder pressure

flame intensity

exhaust gas temperature

crankshaft axial alignment

53

A pyrometer is an instrument used to measure the temperature of the diesel engine .

exhaust

fuel oil

cooling water

cylinder liner

54

A restricted air intake to a diesel engine may result in the engine .

failing to reach rated speed

knocking under maximum load

hunting or surging under light load

overspeeding and running away

55

A restricted diesel engine exhaust manifold operating under a normal load is indicated by .

low firing pressures and low exhaust temperatures

low firing pressures and high exhaust temperatures

high firing pressures and low exhaust temperatures

high firing pressures and high exhaust temperatures

56

A Roots-type blower installed on a direct reversible engine .

is engaged only when turning ahead

is geared so that air flow through the blower is always in the same direction

reverses rotation along with the engine

exhausts to atmosphere when turning astern

57

A Roots-type blower installed on some diesel engines, serves to .

heat the cylinder for hotter compression

push out exhaust gases and replace them with fresh air

force cool air across the radiator, lowering the jacket water temperature

maintain a positive charge of fresh air in the crankcase thus eliminating the chances of a crankcase explosion

58

A safety valve on an auxiliary boiler simmers constantly and can not be stopped by several quick blow-offs using the hand relieving gear. The problem may be .

loose dirt on the seat

exposed valve springs

a clogged drain line

a damaged seat

59

A schematic diagram of an isochronous hydraulic governor is shown in the illustration. When the load is removed the speed increases, and the .

pilot valve (piece #10) moves upward

proportioner piston (piece #25) moves upward

flyweights (piece #8 and #9) move inward and the pilot valve (piece #10) moves downward

balance piston (piece #22) moves downward

60

A SECONDARY function of a waste heat boiler is to .

reduce engine exhaust noise

reduce engine back pressure

increase engine brake horsepower

increase turbocharger efficiency

61

A smoking burner with a pulsating flame in an auxiliary boiler, is an indication that the .

fuel oil supply temperature is normal

burner electrode is incorrectly positioned

fuel/air ratio is incorrect

ignition current is too low

62

A smoking exhaust from an operating diesel engine could be caused by .

low sulfur content in the fuel

a loose injector inlet connection

late fuel injection

high injection pressure

63

A sprayer plate marked 32Y20, as used in a return flow fuel oil system, should only be used with a/an .

burner tip marked 20

burner tip marked 32

orifice plate marked 20

orifice plate marked 32

64

A sprayer plate used in a return flow fuel oil atomizer is correctly installed if the oil .

passes through the whirling chamber before passing through the tangential slots

passes through the tangential slots before passing through the whirling chamber

leaves the burner as a straight stream until mixed with the primary flow of combustion air

leaves the burner as a straight stream until mixed with the swirling atomizing steam

65

A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in .

pilot valve oil pressure

engine torque

compensation needle valve clearance

centrifugal force on the flyweights

66

A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is .

carbon

vanadium

calcium

hydrogen

67

A sudden drop in diesel engine cylinder compression pressure can be caused by .

a leaking fuel injector nozzle

a clogged air filter

excessively early fuel injection

malfunctioning valves

68

A sudden flame failure in an operating auxiliary boiler, equipped with an automatic combustion control system and burning light fuel, could be attributed to a .

dead or malfunctioning step up transformer

faulty ignition cable connector

loose connection on the photocell

rapid fuel viscosity increase

69

A sudden power loss from a turbocharged and after cooled diesel engine is an indication of a/an .

turbocharger malfunction or failure

crankcase exhauster overload

overload on the intercooler

obstruction in the engine cylinders

70

A supercharged diesel engine, when compared to a similar naturally aspirated diesel engine, will develop an increase in .

ignition lag

engine horsepower

lube oil system pressure

specific fuel consumption

71

A thin film of oil on the lobes of a Roots-type blower indicates .

proper lubrication

timing out of adjustment

excessive cylinder lubrication

leaking rotor bearing oil seals

72

A thrust bearing is used with a propulsion diesel engine to .

control axial movement of the crankshaft

transmit engine thrust to the propeller shaft

absorb vibrations in the propeller shafting

prevent propeller thrust from being transmitted to the hull

73

A turbocharged and after cooled diesel engine can overspeed due to .

air in the hydraulic governor

high ambient air temperature

oil leaking into the turbocharger compressor end

insufficient piston ring blow-by

74

A turbocharged diesel engine will have an intake manifold pressure .

constantly decreasing as engine load increases

constantly increasing as the amount of load increases

approximately equal to exhaust manifold pressure at all times

approximately equal to atmospheric pressure at all times

75

A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to increase the .

temperature of the exhaust gases

energy supplied to the turbocharger

air pressure to the intake manifold

purge of exhausted gases from the cylinders

76

A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated, four-stroke/cycle diesel engine in order to increase the .

temperature of the exhaust gases

energy supplied to the turbocharger

air pressure to the intake manifold

cooling effect on the exhaust valves

77

A two-stroke/cycle diesel engine operates erratically, 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

78

A V-12 four-stroke/cycle 500 horsepower diesel engine is operating under a normal load, the firing pressures are low and the exhaust temperatures are high. Which of the following problems is the most probable cause of this condition?

Fuel pump rack setting is too far out.

The air intake filter is missing.

The exhaust back pressure is too high.

The fuel pump rack setting is too far in.

79

A variable capacity, pressure atomizing, fuel oil burner functions to .

maintain a constant fuel temperature

provide a wide range of combustion

provide a constant fuel return pressure

maintain smokeless fuel oil atomization

80

A waste heat boiler is installed on some diesel propelled vessels to .

provide steam for emergency propulsion

provide steam for the turbo generator

heat the waste water tanks

steam for warming engines

81

A water jacket is placed around the exhaust manifolds of propulsion diesel engines to .

reduce heat radiation to the engine room

aid in preventing turbocharger overheating

condense and drain moisture from exhaust gases

dampen exhaust gas pulsations in the manifold

82

A waterside fusible plug, installed in a fire-tube auxiliary boiler .

would be located in the center of the crown sheet and inserted from the fireside

by design, is drilled with a tapered hole so that boiler water pressure holds the fusible metal in the bronze body

is required by Coast Guard Regulations as an excess pressure relieving device

all of the above

83

According to 46 CFRs, which of the following devices is prohibited for use on automatic auxiliary boilers?

Flame safeguard controls.

Mercury tube actuated controls.

Solenoid operated fuel valves.

Pneumatic combustion controls.

84

According to Coast Guard Regulations (46 CFR), the highest boiler pressure where a tubular type gage glass may be installed is .

100 psig

200 psig

250 psig

300 psig

85

According to Coast Guard Regulations (46 CFR), how often shall internal combustion engine driven emergency generators be operated under load?

Once a week for two hours

Once a week for four hours

Once a month for two hours

Every six months for four hours

86

According to Coast Guard Regulations (46 CFR), the fuel strainer installation located in the supply lines to the fuel pump of an auxiliary boiler, can be provided with .

duplex type strainers

single strainers of the self-cleaning type

single strainers fitted with bypasses

all of the above

87

According to Coast Guard Regulations (46 CFR), the maximum allowable boiler pressure in which a tubular gage glass may be installed is .

100 psig

200 psig

250 psig

300 psig

88

According to Coast Guard Regulations (46 CFR), when an automatically fired boiler has a flameout, which of the following actions should occur FIRST?

The fuel valve should be de-energized.

The purge cycle should begin.

An alarm should ring.

The fuel oil pump should stop.

89

According to Coast Guard Regulations (46 CFR), which of the following pressures is the highest boiler pressure where a tubular type gage glass may be installed?

100 psig

200 psig

250 psig

300 psig

90

According to Coast Guard Regulations (46 CFR), which of the following statements is true concerning the water level indicating device for the auxiliary boiler shown in the illustration?

The illustrated arrangement may be used on any steam boiler, for any steam pressure, up to 300 psig.

The minimum size of the piping connecting the water column to the steam drum is to be one inch.

The shutoff valve on the boiler drum must be of cast iron.

A minimum of three test cocks may serve as the primary water level indicator on boilers under 250 psig.

91

According to U. S. Coast Guard Regulations (46 CFR), internal combustion engine driven emergency generators shall be operated under load for at least two hours at least once .

a week

every two weeks

a month

a quarter

92

Additional explosion relief valves are fitted on separate spaces of the crankcase such as gear or chain cases for camshaft or similar drives when the .

gross volume of such spaces exceeds 21 cubic feet

possibility of explosion exists due to the formation of volatile gases

unit is operating in extreme overload conditions

overall volume of the space exceeds 0.6 cubic meters

93

Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at .

maximum power at a normal load

maximum power and load under normal conditions

half speed and normal temperature

normal operating temperature without a load

94

After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the .

furnace to be repurged

electric charge to buildup in the igniter

fuel pump to restart

drum level to stabilize

95

After cooling of a turbocharged diesel engine will result in .

higher torque but lower brake horsepower

lower torque but higher brake horsepower

higher torque and higher brake horsepower

lower torque and lower brake horsepower

96

After cooling of the cylinder air charge of a turbocharged diesel engine will result in .

higher torque but lower brake horsepower

lower torque but higher brake horsepower

higher torque and higher brake horsepower

lower torque and lower brake horsepower

97

After each speed change, the compression of the diesel engine governor speeder spring is returned to a constant value, regardless of the amount of movement of the fuel control mechanism and engine load. Hence, this results in .

speed droop governing

isochronous governing

high sensitivity governing

relay-type governing

98

After lighting off a cold, automatically fired, auxiliary boiler, as steam begins to form, you should .

close the air cock

give the boiler a bottom blow

test the safety valve

completely open the steam stop

99

Air bubbles in a hydraulic governor can cause .

sluggish response

speed droop variations

isochronous governing

sensitivity increase

100

Air receivers installed in starting air systems are to be .

cylindrical in shape with service connections located at the top and bottom

opened and made available for inspection during biannual inspections

provided with automatic drain traps for the removal of moisture

so installed as to make the drain connections effective under extreme conditions of trim

101

Air scavenging of a diesel engine cylinder .

blows out the exhaust gases

supplies oxygen for combustion

cools the valves and cylinder walls

all of the above

102

Air scavenging of the cylinder shown in the illustration, takes place between figures .

2 and 3

3 and 4

4 and 5

5 and 6

103

Airflex clutches are used to transmit power from a diesel engine to the propeller shaft. A restricted orifice is used in the control air system of this unit to .

delay deflation of the clutch being disengaged

delay inflation of the clutch being engaged

reduce the deflation time of both clutches

reduce the inflation time of both clutches

104

All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are low. Which of the following situations is responsible for this condition?

Excessively early injection timing

Combustion knock

Leaking piston rings

Light load

105

All oil-fired boilers, regardless of intended mode of operation, with automatic safety control systems must automatically close the burner valve when .

flame in boiler furnace is confirmed

actuated by boiler safety trip

burner is properly seated

starting trial for ignition occurs

106

All oil-fired boilers, regardless of intended mode of operation, with automatic safety control systems must automatically close the burner valve when .

flame in boiler furnace is confirmed

starting trial for ignition occurs

burner is properly seated

actuated by boiler safety trip

107

An 8000 horsepower diesel engine has a specific fuel consumption of 0.4 lbs. of fuel per horsepower hour. If each pound of fuel contains 18,500 BTU's and 25% of the available heat leaves the engine with the exhaust, how many BTU's per hour are theoretically available for use in a waste heat boiler?

7.4 million BTU's per hour

14.8 million BTU's per hour

22.2 million BTU's per hour

29.6 million BTU's per hour

108

An AC diesel generator incapable of being paralleled with the main bus normally employs an isochronous governor in order to .

increase speed droop in proportion to load

maintain a frequency of 60 cycles per second

increase or decrease engine speed upon load demand

prevent attempts to parallel

109

An accumulation of carbon on one of its thermocouples of an exhaust gas pyrometer will .

read low for that location due to the insulation effect of the deposits

read high for that location due to the hot spots formed by the deposits

fluctuate due to the conductance of carbon

respond quickly to temperature changes

110

An after cooler installed between the turbocharger and the cylinder air inlet .

increases the density of the air

decreases the density of the air

increases the specific heat of the air

decreases the specific heat of the exhaust

111

An automatically fired auxiliary boiler is required by Coast Guard Regulations (46 CFR) to be shutdown as a result of .

low boiler pressure

low water level

wide flame cone angle

high fuel oil pressure

112

An automatically fired auxiliary boiler with carbon deposits formed on its burner electrodes, will experience .

flame failure

ignition failure

panting of the furnace

sputtering of the burner flame

113

An auxiliary boiler equipped with a return flow fuel atomization system, has a .

constant fuel combustion rate

constant fuel return pressure

variable fuel supply temperature

variable fuel return pressure

114

An auxiliary boiler is equipped with a return flow fuel atomization system, which uses a/an .

constant fuel supply pressure

constant fuel return pressure

variable fuel supply pressure

all of the above

115

An electric motor failure in an electro-hydraulic steering gear system would cause the rudder to .

swing 35 right or left

remain locked in its last position

move to the midship position automatically

swing up against the rudder emergency stops

116

An engine is equipped with the overspeed trip similar to that shown in the illustration. The throw out weight is designed to run at 900 RPM and trip out at 10% overspeed. However, the overspeed trip is currently activating at 930 RPM. In order to correct this problem, .

increase compression on spring #12

decrease compression on spring #12

install a larger throw out weight piece #10

change the angle of the operating face by machining piece #10

117

An excessively high brine level in a low pressure distilling plant can be caused by .

excessive brine pump motor speed

an excessive brine blow down rate

failure of the brine pump

excessive distillate pump speed

118

An exhaust gas bypass is installed on a waste heat boiler in order to .

bypass exhaust gas at high loads to prevent excessive back pressure

bypass a portion of the exhaust gas at peak loads for better efficiency

reduce corrosion in gas passages at low loads

recycle exhaust gas to the turbocharger

119

An exhaust gas bypass is installed on a waste heat boiler in order to .

bypass exhaust gas at high loads to prevent excessive back pressure

bypass a portion of the exhaust gas at peak loads for better efficiency

recycle exhaust gas to the turbocharger

minimize moisture condensation in the boiler gas passages at low loads

120

An exhaust pipe from a internal combustion engine may not need to be insulated when .

installed on fishing vessels

it is of the water jacketed type

it is used as an emergency generator

special provision is made by the Chief Engineer

121

An important design characteristic of an explosion relief valve for a diesel engine is the ability to .

open slowly to permit a gradual reduction of crankcase pressure

open quickly against crankcase pressure to prevent a possible implosion

close quickly in order to prevent an inrush of air

close slowly to permit proper seating of the valve disc and neoprene sealing surfaces

122

An increase in power output of a turbocharged diesel engine operating at a constant engine speed results in .

higher exhaust temperature

increased turbocharger speed

higher air box pressure

All of the above are correct.

123

An increase in the air inlet manifold pressure of a diesel engine will result in a/an .

decrease in maximum cylinder pressure

increase in ignition lag

decrease in fuel consumption per horsepower-hour

decrease in exhaust manifold pressure

124

An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in .

exhaust temperature

air box pressure

mean effective pressure

all of the above

125

An indication of a diesel engine air intake being partially clogged, is .

low firing pressure and low exhaust temperatures

low firing pressure and high exhaust temperatures

high firing pressure and low exhaust temperatures

high firing pressure and high exhaust temperatures

126

An indication of high salinity in the distillate discharged from a low pressure distilling plant can be the result of .

maintaining the proper distilling plant heat balance

carrying the brine level below normal

leaks in the demister baffles

venting of the saltwater heater drain pump

127

An inline engine having a nine inch bore and more than eight cylinders will .

incorporate the use of two explosion relief valves

have three explosion relief valves

have at least eight explosion relief valves

not be required to have explosion relief valves

128

An operating diesel engine may gradually lose output power due to a/an .

restricted turbocharger air intake filter

pressure increase in the air manifold

dribbling injector

low fuel viscosity

129

An operating diesel engine that suddenly loses power, is due to a/an .

restricted turbocharger air intake

oil leak into the turbocharger

dribbling injector

low fuel viscosity

130

An operating turbocharged diesel engine that suddenly loses power, is due to a/an .

restricted turbocharger air intake

oil leak into the turbocharger

dribbling injector

low fuel viscosity

131

An overcorrecting and unstable engine governor operation is known as .

droop

dead banding

dash potting

hunting

132

Any increase in the exhaust back pressure of a four- stroke/cycle diesel engine will .

reduce engine horsepower output

aid in silencing the exhaust noise

increase the mean effective pressure

contribute to effective cylinder scavenging

133

As shown in the illustration, if the vessel was operating at full sea speed, the area labeled "A" would be used to .

collect the saturated steam generated in area "1" by the engines exhaust gases

superheat the steam generated by the oil fired mechanical burner

preheat the feed water to the waste heat boiler

collect stack gas

134

As shown in the illustration, if the vessel were operating at full sea speed, the area labeled "A would be used to .

collect the saturated steam generated in area "1" by the engines exhaust gases

superheat the steam generated by the oil fired mechanical burner

preheat the feed water to the waste heat boiler

collect stack gas

135

As shown in the illustration, the area labeled as "C" would be identified as the .

oil fired boiler furnace

oil fired boiler mud drum

oil fired boiler water drum

waste heat boiler steam separator

136

As shown in the illustration, the component labeled "E" would be identified as a .

waste heat boiler circulating pump

boiler water feed pump

main condensate pump

fuel oil service pump

137

As shown in the illustration, the component labeled "F" would be identified as a .

waste heat boiler circulating pump

boiler water feed pump

main condensate pump

fuel oil service pump

138

As shown in the illustration, the component labeled "H" would be identified as a .

waste heat boiler circulating pump

boiler water feed pump

main condensate pump

fuel oil service pump

139

As shown in the illustration, the function of component "1" is to .

generate superheated steam to operate the turbo generator

evaporate circulating boiler water into saturated steam

maintain a water level in the steam drum

condense excess steam produced in the boiler

140

As shown in the illustration, the function of component "1" is to .

generate superheated steam to operate the turbo generator

condense steam exhausting from the turbo generator

transfer engine exhaust heat to circulating boiler water to generate saturated steam

condense excess saturated steam produced in the boiler

141

As shown in the illustration, the function of component "3" is to .

generate superheated steam to operate the turbo generator

generate saturated steam when the vessel is underway

preheat feed water before entering the steam drum

condense excess steam produced in the boiler

142

As shown in the illustration, the function of the component labeled "G" would be to .

condense steam exhaust from the turbo generator

provide a source of circulating water into the waste heat boiler

provide a source of fuel for the fuel oil service system

provide a reservoir of feed water for the boiler feed pump

143

As shown in the illustration, the main function of the valve labeled "6" would be to .

raise vacuum during startup

recirculate feed water at low loads

relieve excess steam pressure when the turbo generator is idling

provide make-up feed water for the hot well

144

As shown in the illustration, the primary function of the valve labeled "6" would be to .

raise vacuum during startup of the turbo generator

recirculate feed water at low loads

relieve excess steam pressure when the turbo generator is idling

provide make-up feed water for the hot well

145

As shown in the illustration, what component would normally be installed at location "B"?

Boiler water level indicator

Oil fired mechanical burner

Boiler soot blower unit

Flue gas pyrometer

146

As shown in the illustration, what component would normally be installed at location "D" ?

Boiler water level indicator

Oil fired mechanical burner

Boiler soot blower unit

Flue gas smoke indicator

147

As the load is being decreased on the engine controlled by the governor shown in the illustration, the .

right hand end of the floating lever will move up

speeder rod will move down

pilot valve plunger will move down

oil pressure under the power piston will increase

148

At rated engine load and RPM, the diesel engine turbocharger is powered by .

belt drive

exhaust gases

electric motor

friction clutch

149

At the beginning of the prepurge period on an automatic auxiliary boiler equipped with a programmed control system, the unit will not restart if airflow is not sensed and .

the damper is not sufficiently opened

the damper is not fully closed

oil pressure is not sensed

water pressure is not sensed

150

At the point in time indicated by the information shown in the illustration, the #3 piston is on the .

intake stroke

exhaust stroke

compression stroke

power stroke

151

At what pressure should a cylinder relief valve of an internal combustion engine be set to relieve?

The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure.

The valves should be set to just stop relieving with the engine running at full speed.

Cylinder relief valves should only be adjusted by an authorized repair facility with the permission of the OCMI.

Cylinder relief valves are no longer required for large low speed engines due to advancements in combustion engineering.

152

Automatic burner shutdown in an auxiliary boiler, as a result of a component failure in the flame safeguard controls, will .

prevent the boiler from automatically relighting

eliminate the need for furnace purging

cause automatic restart after a purge period

cause an explosion in the boiler furnace

153

Automatic combustion control systems for auxiliary boilers are designed to cycle burners on and off in response to the .

excess air pressure

steam moisture content

furnace temperature

steam pressure

154

Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on and off in response to .

fuel supply pressure

fuel return pressure

steam pressure

furnace air pressure

155

Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on in response to .

low fuel pressure

fuel return pressure

low steam pressure

furnace air pressure

156

Automatically fired auxiliary boilers use fuel oil strainer arrangements of either the simplex type or .

filter bag type

metal disc type

absorbent type

duplex type

157

Auxiliary boilers are divided into several classifications, one of which is .

water-tube supercritical circulation

water-tube forced circulation

fire-tube controlled circulation

fire-tube express circulation

158

Auxiliary boilers are divided into several classifications, one of which is .

fire-tube controlled circulation

fire-tube supercritical circulation

water-tube natural circulation

water-tube express circulation

159

Auxiliary boilers can be classified as .

water-tube natural circulation boilers

fire-tube boilers

water-tube forced circulation boilers

all of the above

160

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

161

Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of .

10

7

4

1

162

Before any work is done on a burner in an automatically fired auxiliary boiler, you should always .

block all control valves

allow the boiler to cool completely

lock all safety interlock switches closed

close all manually operated fuel valves

163

Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always .

allow the boiler to cool completely

close all manually operated fuel valves

lock all safety interlock switches closed

block all control system relays closed

164

Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always .

block all control system relays closed

allow the boiler to cool completely

close all manually operated fuel valves

lock all safety interlock switches closed

165

Black smoke exhausting from a diesel engine indicates .

proper fuel injection

water in the fuel

incomplete combustion

burning of lube oil

166

Black smoke exhausting from a diesel engine may be caused by .

excessive scavenging air pressure

high coolant temperature

insufficient fuel

a clogged air cleaner

167

Black smoke exhausting from an operating diesel engine can be caused by .

fuel dribbling from leaking fuel injectors

burning fuel with a high carbon content

burning fuel with a high vanadium content

burning fuel with a lower sulphur content

168

Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by .

water in the fuel

insufficient fuel for combustion

clogged air intake passages

burning lubricating oil

169

Bluish smoke in the exhaust of an operating diesel engine can be caused by .

an overheated engine

a scored cylinder liner

water leaking into a cylinder

low combustion temperature

170

Bottom blow valves are installed on auxiliary water-tube boilers to .

remove suspended and precipitated solids from the boiler water

completely drain the boiler in an emergency situation

prevent hardened scale deposits in the water drum

remove floating impurities from the boiler water surface

171

Bottom blow valves are installed on auxiliary water-tube boilers to .

completely drain the boiler in an emergency

prevent sludge from forming in the steam drum

remove floating impurities from the boiler water surface

remove settled solids from the water drum

172

Bouncing of the valve gear in a diesel engine can be caused by .

prolonged high speed operation

spring surge

worn valve seats

excessively tightened spring retainers

173

Broken intake valve springs on one cylinder of a diesel engine can cause the engine to .

overspeed

fire improperly

lose oil pressure

overheat rapidly

174

Burner ignition failure in an automatically fired auxiliary boiler would be caused by .

a burned out solenoid in the oil supply valve

high temperature excess air

incorrectly setting the hot well dump valve

an incorrectly positioned burner snubber relay

175

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a .

tachometer

pyrometer

dynamometer

calorimeter

176

Casing drains may be required on a waste heat boiler gas passage side to .

prevent an accumulation of boiler water entering gas passages as a result of a pinhole tube leak

as a means to sample stack gases for testing

release excess pressure

drain off condensation

177

Changing the position of the fulcrum in the compensating system of the governor shown in the illustration will .

force the thrust bearing down on the flyweight toes

change the speed of the rotating bushing

change the amount of stroke available to the actuating compensating piston

change the stroke of the load limit shutdown lever

178

Clearance volume scavenging in a turbocharged, four- stroke/cycle diesel engine is accomplished .

during the valve overlap period

with only the exhaust valve open

at a pressure below atmospheric

without cooling the cylinders or pistons

179

Clogged or partially obstructed exhaust ports on a diesel engine can cause .

overspeeding of the engine

failure of the engine to shut down

no effect of engine performance

high exhaust temperatures

180

Clutching takes place nearest the bearing shown in the illustration, located at # .

1

2

3

4

181

Coast Guard Regulation (46 CFR) requires that after undergoing extensive repairs, an auxiliary boiler, with a maximum allowable working pressure of 60 psig (411.89 kPa), should be hydrostatically tested at a pressure of .

75 psig (514.86 kPa)

80 psig (549.18 kPa)

90 psig (617.83 kPa)

120 psig (823.77 kPa)

182

Coast Guard Regulations (46 CFR) permit drain valves in the machinery space for removing water and impurities from diesel engine fuel systems. Those valves must be .

ball-check valves to prevent leakage

automatically closed by a solenoid

connected through the tank top

fitted with caps or plugs to prevent leakage

183

Coast Guard Regulations (46 CFR) permit the use of drain valves for removing water or impurities from diesel engine fuel systems. These valves must be .

self-closing gate valves

operated electrically

connected through the tank top

located in the machinery space

184

Coast Guard Regulations (46 CFR) permit the use of which of the following fuel oil ignition methods on automatic auxiliary boilers?

Incandescent glow plug

Friction igniter

Light oil pilot

Gas pilot light

185

Coast Guard Regulations (46 CFR) permit tubular type water gage glasses on auxiliary boilers, provided the maximum allowable working pressure does not exceed .

600 psi

450 psi

250 psi

125 psi

186

Coast Guard regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine must .

terminate above the deepest load waterline

be equipped with a water-cooled muffler

have adequate insulation in any berthing space

not penetrate the engine room casing

187

Coast Guard Regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine must .

be equipped with a water cooled muffler

be arranged to prevent entry of boarding seas

have adequate insulation in any berthing space

not penetrate the engine room casing

188

Coast Guard Regulations (46 CFR) require a horizontal dry exhaust pipe from a diesel engine to .

be equipped with a water-cooled muffler

have adequate insulation in any berthing space

terminate above the deepest load waterline

not penetrate the engine room casing

189

Coast Guard Regulations (46 CFR) require all automatically fired low pressure heating boilers to have an automatic .

fuel cutoff as a result of low water

pressure-control regulator

feed water control valve

superheat control system

190

Coast Guard Regulations (46 CFR) require electric hot water supply boilers to be provided with a/an .

audible high water level alarm

temperature limiting device

pressure relief valve set at 212F

automatic reset pressure limiter

191

Coast Guard Regulations (46 CFR) require electric hot water supply boilers to be provided with a/an .

audible high water level alarm

temperature limiting device set at 212F

pressure relief valve set at the MAWP

automatic reset pressure limiter

192

Coast Guard Regulations (46 CFR) require emergency diesel generator sets, with forced lubrication systems, to be provided with a .

low lube oil level alarm system

low lube oil pressure alarm system

low lube oil level cutoff system

high cooling water temperature cutout system

193

Coast Guard Regulations (46 CFR) require steel tubing connections and fittings used with diesel fuel oil systems, to be either flared or .

of the flareless nonbite type

silver soldered

have welded flanges

have seal-welded threads

194

Coast Guard Regulations (46 CFR) require that small automatic auxiliary boilers shall be equipped with a prepurge programming control that will assure at least .

2 air changes

3 air changes

4 air changes

5 air changes

195

Coast Guard Regulations (46 CFR) require that the flame safeguard control system for an automatic boiler, should .

be designed to automatically relight the boiler fires after a low water shutdown

incorporate an open bimetallic helix pyrostat stack switch

be capable of closing the fuel valves in not more than 4 seconds after a flame failure

provide a trial for ignition period of not more than 90 seconds

196

Coast Guard Regulations (46 CFR) require the "trial for ignition period" on boilers must not exceed .

15 seconds

30 seconds

60 seconds

90 seconds

197

Coast Guard Regulations (46 CFR) require the controls for automatically fired auxiliary boilers, must be fitted with visible indicators to signal .

fuel oil shutoff due to flameout

low voltage in the flame scanner circuit

high boiler water level

high steam pressure

198

Coast Guard Regulations (46 CFR) require the programming control sequence for auxiliary boiler operation to include .

prepurge period for one complete change of air

ignition period to ignite the fuel 4 seconds after fuel delivery

not to automatically increase the air flow after a safety trip

all of the above

199

Coast Guard Regulations (46 CFR) specify that the fuel oil ignition system, on a small automatically fired auxiliary boiler, shall be energized .

only before, or simultaneously with, the opening of the fuel oil valve

after the fuel oil valve opens

after a prepurge of not less than 10 seconds

before the trial for ignition period

200

Coast Guard Regulations (46 CFR) state that emergency diesel generator starting systems must have sufficient capacity to provide at least .

3 continuous starting sequences

6 consecutive cranking cycles

9 repeated starts under load

12 cranking periods of 5 seconds each

201

Coast Guard Regulations regarding diesel fuel oil systems, 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

202

Cold weather starting of a diesel engine may be made easier by .

decreasing the compression ratio

using a special fuel having a high ignition temperature

increasing the starting air supply

heating the jacket water

203

Collapsed hydraulic valve lifters in a diesel engine will result in .

excessive rocker arm movement

little or no valve clearance

excessive valve clearance

collapsed or stacked valve springs

204

Compared to a naturally aspirated diesel engine, a supercharged diesel engine has .

a cylinder air charge of higher pressure

reduced cylinder mean effective pressure

less valve overlap

reduced blow-by

205

Comparing the exhaust gas output of each cylinder of a diesel engine is one method of determining if the engine load is balanced. This can be determined by the use of a .

tachometer

calorimeter

pedometer

pyrometer

206

Compensating needle valve adjustments to a hydraulic governor should be made with the engine .

running at normal operating temperature without load

running at half speed and at normal temperature

running at maximum power and load under normal conditions

developing maximum power at normal load

207

Concerning diesel propelled vessels, the astern power is to provide for continuous operation astern .

equal to that available for ahead operation

at 70 percent of the ahead rpm at rated speed

while underway and under all normal conditions

at 70 percent of the ahead rpm of average continuous sea speed

208

Constant capacity pressure atomizing fuel oil burners installed on automatically fired auxiliary boilers, respond to variations in load demand by .

automatically increasing the fuel/air ratio

automatically cycling the burner on and off

responding to the boiler high and low water level limit switches

regulating the fuel oil service pump discharge pressure

209

Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are .

automatically supplied with warmer air on demand

automatically supplied with more fuel on demand

equipped with standard variable capacity atomizers

cycled on and off in response to steam demand

210

Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a .

pressure magnifying device in the steam coil outlet

steam pressure sensing device with linkage to the damper air vanes

metering device in the air supply line

signal from the feed water electrode

211

Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the .

wheelhouse control station

engine room control station

captain's office

chief engineer's office

212

Cooling the intake air supplied to a diesel engine will .

reduce mean effective pressure

decrease average compression ratio

decrease air charge density

increase peak power output

213

Corrosion and grooving on the blading of an exhaust driven turbocharger is caused by certain components of residual fuel oils. These components are vanadium, sodium, and .

copper

carbon

hydrogen

sulfur

214

Crankcase explosion relief valves should be of the .

return seating type

spring centered type

spring opened type

duplex double acting type

215

Cylinder scavenging in a turbocharged, four-stroke/cycle, single acting, diesel engine is accomplished .

without cooling the pistons or cylinders

at a pressure below atmospheric

during the valve overlap period

with only the exhaust valve open

216

Cylinders diameters greater than 230 mm require additional safety devices when the scavenging spaces are openly connected to the cylinders. Which of the following devices will be used to protect such spaces?

Tri-knock fittings

Explosion relief valves

Quick release expansion joints

Stacked plate type inlet check valves

217

Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open .

earlier and have less lift

earlier and remain open longer

later and have greater lift

later and have less duration

218

Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor?

Lube oil pressure and temperature

Jacket water pressure and temperature

Engine overspeed

Lube oil sump level

219

Diesel engine control can be obtained by the bridge .

at any time

only after the engine room control station is switched to 'bridge control'

whenever the secondary station is switched to 'bridge control'

with the approval of the chief engineer only

220

Diesel engine exhaust gas temperatures can be used to determine individual cylinder .

performance

horsepower output

fuel consumption

scavenge effect

221

Diesel engine exhaust noise can be reduced in an exhaust muffler by .

changing the direction of exhaust gas flow

increasing the exhaust gas velocity

changing the exhaust gas weight

increasing the exhaust gas static pressure

222

Diesel engine exhaust temperatures may be used to indicate .

leaking exhaust valves

an overloaded cylinder

a clogged injector nozzle

all of the above

223

Diesel engine exhaust valve springs are under compression when the valves are .

wide open only

partially open only

closed only

in any position

224

Diesel engine mufflers accomplish noise reduction by .

reducing exhaust gas velocity

increasing the frequency of gas vibration

the use of long head pipes

the use of zinc electrodes

225

Diesel engine mufflers or silencers reduce the engine exhaust noise by .

passing the exhaust through long head pipes

diffusing exhaust vibrations through activated carbon baffles

increasing the exhaust gas velocity

reducing the exhaust gas velocity

226

Diesel engine mufflers reduce noise by .

packing muffler chambers

the use of long head pipes

the use of zinc electrodes

changing exhaust gas direction

227

Diesel engine operating conditions are indicated by the color of the exhaust smoke. Blue smoke can indicate .

low compression pressure and high exhaust temperature

an overloaded engine

clogged drain holes in the oil control rings

complete combustion

228

Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as .

actuation

sensitivity

compensation

promptness

229

Direct reversible main propulsion diesel engines would normally be fitted with a/an .

constant speed governor

variable speed governor

isochronous hunting governor

nutating disk governor

230

Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by .

refractory and insulation

several rows of screen tubes

steel baffles

water wall tubes

231

During a routine round of a diesel engine generator, you observe a low oil level in the governor sump. If there is no visible sign of external leakage, you should suspect the cause to be a/an .

leakage through the governor drive shaft oil seal

leakage through the power piston oil seal

uncovered sight glass ventilation orifice

defect in the sight glass gasket

232

During diesel engine warm-up, which type of valve lash adjuster automatically compensates for the thermal expansion of the exhaust valve stem?

Mechanical

Hydraulic

Pneumatic

Electrical

233

During diesel engine warm-up, which type of valve lash adjuster compensates for the change in length of the exhaust valve stem?

Mechanical

Hydraulic

Pneumatic

Electrical

234

During maintenance inspections of a fire tube auxiliary boiler, you should check for .

metal deterioration of the tubes at the tube sheet

burning of tube ends

fireside corrosion

all of the above

235

During the process of cylinder scavenging, the size of the exhaust valve opening is .

most critical in a four- stroke/cycle diesel engine

most critical in a two- stroke/cycle diesel engine

most critical in a four- stroke/cycle diesel engine if it is turbocharged

of equal importance in a two-stroke/cycle diesel engine as in a four- stroke/cycle diesel engine

236

During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure .

effective cylinder scavenging and cooling

constant pressure from the turbochargers

cooler operation of the exhaust system

effective constant pressure for turbocharger operation

237

During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as .

limit controls

flame safeguard controls

combustion controls

programming controls

238

Each receiver in a starting air system which can be isolated from a relief valve .

is to be provided with a suitable fusible plug to relieve the pressure in case of fire

will incorporate the use of an automatic unloading device

will not be approved for classification purposes

and satisfy U.S.C.G. regulations shall be approved

239

Effective hydraulic coupling operation depends upon a certain amount of .

slip

mechanical friction

fluid overheating

torsional vibration

240

Effective operation of a hydraulic coupling depends upon a specified amount of .

slip

mechanical friction

fluid overheating

torsional vibration

241

Engine operating conditions may be indicated by the color of the exhaust smoke. Black smoke could indicate .

an insufficient speed droop setting

an overloaded engine

clogged drain holes in the oil control rings

complete combustion

242

Engines having a bore exceeding 250 mm, but not exceeding 300 mm are to have at least .

three compression rings per piston and the minimum of two oil scraper rings

one intake and one exhaust valve per cylinder provided no other means of scavenging is used

one explosion relief valve in way of each alternate crank throw, with a minimum of two valves

one crankshaft except in cases where an opposed piston design is required

243

Excessive alkalinity of the water in an auxiliary boiler can cause .

caustic embrittlement of the boiler metal

acidic corrosion of the boiler metal

hard scale deposits on the boiler tubes

etching of the heat exchange surfaces

244

Excessive diesel engine back pressure may be an indication of .

carbon buildup in the exhaust manifold

overcooling of the exhaust manifold

eroded muffler baffle plates

high injection pressure

245

Excessive diesel engine cylinder exhaust back pressure will be caused by .

slight timing discrepancies

heavy fuel injection

an obstruction in the exhaust silencer

a fouled intake manifold

246

Excessive exhaust temperatures in a two-stroke/cycle diesel engine can be caused by a/an .

high injection pressure

high firing pressure

overheated air starting line

carbon build up in the exhaust ports

247

Excessive mechanical and pulsating vibrations developed in a main propulsion diesel engine may be more likely to cause damage to an attached .

scavenged air pump because it is designed for steady state operation rather than pulsating gas load

reciprocating scavenge pump because of its direct linkage to the crankshaft

centrifugal cooling water pump because of the close tolerances required between the impeller rim and the volute

gas driven turbocharger because it has a wide speed range, high operating temperatures and close tolerances.

248

Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an automatic auxiliary boiler, will cause .

flame failure

burner smoking

ignition failure

burner failure

249

Excessive valve clearance will cause a valve to open .

early and close early

early and close late

late and close early

late and close late

250

Excessive valve lash in an auxiliary diesel engine will cause the valves to open .

later and close sooner

sooner and close later

sooner and close sooner

later and close later

251

Excessive vibration from an auxiliary boiler could be caused by .

combustion pulses

insufficient air to the burner

loose hold-down bolts

all of the above

252

Excessive vibration in an operating diesel generator may be caused by .

electrical overload

surging at governed RPM

loose engine mounting bolts

coolant leaking into the cylinder

253

Excessive vibration of an automatically fired auxiliary boiler can be caused by .

air or water in the furnace

combustion pulses

fuel oil pump failure

flame failure

254

Excessive wear at part #11, shown in the illustration would result in .

improper timing

increased oil consumption

lost compression

low oil pressure

255

Excessively worn, or polished ends on a diesel engine valve spring, indicate .

burned exhaust valves

excessive spring compression

spring surge

worn valve seats

256

Exhaust gas pyrometers are useful for .

detecting faulty combustion in individual cylinders

calculating engine cylinder torque

adjusting the load limit setting of the governor at idle conditions

calculating total engine output horsepower

257

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by .

natural aspiration

masked intake valves

air cells

scavenging air

258

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by .

natural aspiration

masked intake valves

air cells

scavenging air pressure

259

Exhaust gases in a two-stroke/cycle diesel engine are discharged through .

the air valves

a roots-type blower

exhaust ports or valves

the after cooler and directed to the stack

260

Exhaust pipes for separate main propulsion diesel engines can be combined only when .

space limitations prevent separately run pipes

the engines are small auxiliary units

they are arranged to prevent gas backflow to each engine

a waste heat boiler is installed

261

Exhaust pipes of multiple engine installations are not to be interconnected, but are to be run separately to the atmosphere .

unless arranged to prevent the return of gases to an idle engine

to a point not lower than the highest load line

at a location segregated from other ventilation systems

and shall be protected by a rain guard or similar device

262

Exhaust pyrometer readings provide an indication of the .

effectiveness of water- cooled exhaust elbows

distribution of the load between engine cylinders

amount of fuel penetration into the engine cylinders

indicated horsepower of the engine cylinders

263

Exhaust valve openings in a two-cycle diesel engine cylinder head are made as large as practical to .

increase back pressure during the exhaust process

facilitate periodic replacement of the valves

reduce the pumping loss associated with scavenging

reduce tension on valve springs

264

Exhaust valve timing for the engine, shown in the illustration, is to be set at 106 after top dead center. To what position should the flywheel be rotated to set the exhaust valve timing on the #11 cylinder?

61

209

315

360

265

Explosion relief valves on diesel engine crankcases should relieve the pressure at not more than .

0.1 bar

0.2 bar

1.0 bar

2.0 bar

266

Failure of the burner flame in an automatic auxiliary boiler would probably be a result of .

water in the fuel oil

broken high tension leads

incorrect electrode setting

full fuel pressure at the nozzle

267

Failure of the feed pump to deliver feed water to an auxiliary boiler could be caused by .

a low pump suction lift

abnormally low water temperature

grounded probes in the water level control

a high pump suction head

268

Failure of the speeder spring in a mechanical governor will .

result in an increase in engine speed

result in a decrease in engine speed

not affect the engine speed

cause the governor to hunt

269

Fins are installed on the fireside of the water-tubes used in waste heat boilers to .

decrease the velocity of gases flowing past the tubes

increase the rate of heat transfer

reduce accumulations of carbon deposits

direct the flow of gases

270

Fins are installed on the fireside of the water-tubes, used in waste heat boilers, to .

decrease the velocity of gases flowing past the tubes

reduce the accumulation of soot deposits on the tubes

create turbulence

increase the heat transfer surface area

271

Fins are installed on the generating tube surfaces in waste heat boilers to .

prevent soot fires in the exhaust system

prevent exhaust gas erosion of the tubes

increase the velocity of exhaust gas flow

increase the rate of heat transfer

272

Flame failure in an automatically fired auxiliary boiler can result from a/an .

incorrect electrode setting

incorrect nozzle position

clogged fuel nozzle

broken high tension lead

273

Flame failure in an operating automatically fired auxiliary boiler can result from a .

broken electrode insulator

faulty steam pressure signal to the trial for ignition circuit

broken 2000 volt supply lead

clogged fuel nozzle

274

Fluid forces that are generated inside the coupling shown in the illustration, tend to separate the runner and impeller during operation when the .

ring valves are in the open position

fluid is entrained with air

fluid viscosity decreases

coupling is filled with fluid

275

Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine?

Blank off the exhaust gas inlet to the damaged turbocharger.

Secure cooling and lubrication to the damaged turbocharger.

Lock the rotor of the damaged turbocharger.

All of the above.

276

For a diesel engine, individual cylinder performance is commonly determined by exhaust gas .

chemical analysis

back pressure readings

pyrometer readings

infrared analysis

277

For proper operation, auxiliary boiler feed water must have which of the following characteristics?

High oxygen concentration

Low pH

Proper alkalinity

All of the above

278

Forcing the exhaust gases from the cylinder of an operating two cycle diesel engine with the aid of a blower is known as .

scavenging

forced draft

turbocharging

aspiration

279

Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to .

react with insufficient speed droop

fail to react to small speed changes

have excessive sensitivity to small speed changes

remain in the neutral position

280

From the engine data given in the illustration, what is the full load air manifold pressure?

7.66 psi

15.22 psi

45.70 psi

50.00 psi

281

Fuel oil transfer systems used onboard diesel propelled vessels are required to have .

two fuel oil transfer pumps provided where one is to be independent of the main engine

two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engine

engine driven transfer pumps and only used in constant speed applications

the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached

282

Fusible plugs are installed in fire-tube boilers to .

provide a means of draining the boiler

warn the engineer of low water level

cool the crown sheet at high firing rates

open the burners' electrical firing circuits

283

Gear "D" hobbed with 42 teeth and rotates at a speed of 700 RPM. If gears "A", "B", and "C" have 42, 60, and 32 teeth respectively, the RPM of "A" in the gear train illustration is .

373.33 RPM

199.11 RPM

512.20 RPM

145.69 RPM

284

Gear-type flexible couplings are often used in diesel engine drive trains because they .

require no lubrication under normal operating conditions

compensate for gross misalignment in the drive train

are able to transmit high torque, even where slight misalignment exists

will rapidly disconnect the engine from the line shaft

285

Generating tubes in waste heat boilers are finned to .

reduce gas flow turbulence

prevent exhaust gas corrosion

increase the rate of combustion

increase the rate of heat transfer

286

Governor hunting is caused by .

governor under-control

excessive speed droop

insufficient speed droop

governor over-control

287

Governors used on diesel engines to limit the load must be equipped with .

a fixed maximum fuel stop

a variable maximum fuel stop

pivotless centrifugal fly balls

a proportional action compensation mechanism

288

Grey smoke exhausting from a running diesel engine can be caused by .

late ignition

water in the fuel

high compression temperature

starting valve stuck open

289

Heavy 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?

Glazing of the cylinder liners

Increased exhaust valve wear

Excessive bearing wear

Increased MEP

290

Heavy soot accumulations in an auxiliary boiler could be caused by .

water in the fuel oil

excessive cycling

high fuel oil pressure

improper burner maintenance

291

Helical reduction gears, as used with main propulsion drive trains, are constructed so that several teeth are meshed at the same time to .

eliminate propeller shaft end thrust

translate heavy load into high speed output

provide smooth continuous power transmission

allow construction with fewer gear teeth

292

High exhaust back pressure will result in an increase in .

turbocharger efficiency

engine power output

carbon deposits on fuel injectors

cylinder scavenging

293

High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by .

engine overload

low combustion temperature

plugged fuel nozzle holes

excessive compression pressure

294

High exhaust temperatures from all of the cylinders of a turbocharged, four-stroke/cycle diesel engine can be caused by an .

inoperative turbocharger

inadequate fuel supply

overload on one cylinder

unequal load distribution

295

High firing pressures and a low exhaust temperature in a diesel engine may result from .

early exhaust valve opening

increased exhaust system back pressure

early fuel injection timing

low scavenge air temperature

296

High firing pressures and a low exhaust temperature in a diesel engine may result from .

early exhaust valve opening

increased exhaust system back pressure

excessive cylinder air turbulence

early fuel injection timing

297

High stack temperature occurring in an auxiliary boiler could be a result of .

insufficient air for combustion

complete combustion in the furnace

secondary combustion in the uptake

high fuel oil temperature

298

Higher than normal temperature air passing through the intake of a diesel engine will result in .

greater overall efficiency

greater fuel economy

lower peak horsepower

lower compression ratio

299

How are hydraulic valve lash adjusters on diesel engine rocker arm assemblies lubricated?

Cup-fed grease

Sealed self-lubricators

Metered hydraulic oil supply

Forced lube oil supply

300

How is the concentration of dissolved oxygen in the feed water of an auxiliary boiler maintained at acceptable limits?

Feed water is cycled through a DC heater.

Feed water is treated with phosphates.

Oxygen is liberated in the three-stages of feed water preheating.

Oxygen is liberated by maintaining the highest practical feed water temperature.

301

How is the diesel engine operating RPM affected when a 'ZERO DROOP' setting is selected on the governor?

The RPM will drop to low idle when load is applied.

The RPM must be manually controlled by the load limit knob.

The governor has no control over RPM in this mode.

The RPM will remain the same with or without load.

302

How many crankcase relief valves are required for a 13 inch bore, eight cylinder in-line engine?

2

4

6

8

303

Hydraulic couplings will transmit torque equal to the input torque by means of energy changes in a rotating vortex of liquid. For the vortices to form, there must be .

slip between the impeller and runner

less than 2 per cent slip between the impeller and runner

axial thrust generated by the runner pinion shaft

momentary torsional vibration transmitted by the driving impeller

304

If a clicking sound is being produced from within the valve compartment of a diesel engine, the cause may be .

a loose valve stem and guide

excessive valve clearances

a stuck valve

all of the above

305

If a diesel engine continues to run after attempting to shut it down, the probable cause is .

incandescent carbon particles

air remaining in the cylinders

lube oil leakage into the air intake system

a broken turbocharger valve

306

If a diesel engine starts firing, but is unable to come up to normal speed, the cause may be .

insufficient fuel supply

faulty governor

high exhaust back pressure

all of the above

307

If a diesel engine's exhaust temperature is abnormally high, the cause could be .

too light of a load

injection timing is too early

overloading of the engine

too low of a compression ratio

308

If a higher than normal water level is observed through the inspection port of a low pressure distilling plant, you should suspect .

a leak in the feed water heater

improper vacuum

a malfunctioning brine pump

a clogged desuperheater water strainer

309

If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperature, then the air should be purged, and the .

rack position should be adjusted

compensating needle valve should be opened fully

compensating needle valve should be adjusted to stabilize operation

speed limiting device should be adjusted

310

If a main propulsion diesel engine hunts excessively at idle speed, you should .

adjust the idle speed control

drain and flush the governor and replace the oil

adjust the compensating needle valve

adjust the load limit

311

If a tube ruptures in a water-tube auxiliary boiler due to low water, you should .

secure the fires and maintain feed water to boiler to keep up the water level

not secure the fires until water level falls out of sight in the gage glass

secure both the fires and the feed inlet valve

secure the fires when the pressure drops to 50% of the maximum allowable working pressure

312

If a two-stroke/cycle diesel engine is overspeeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?

Move the fuel control mechanism to the no fuel position.

Block the fuel supply by closing the master fuel valve.

Shut off the fuel supply and block the flow of intake air.

Relieve all pressure in the fuel system.

313

If a valve seat insert, similar to that shown in the illustration is cracked, this may be indicated by .

white vapor in the exhaust gas

high exhaust pyrometer readings on that particular cylinder

continuous spring surge

a jammed indicator cock

314

If an engine operates at 900 RPM at no load, and at 870 RPM at full load, the speed droop is .

3.1%

3.4%

3.7%

4.0%

315

If an operating auxiliary boiler has a water pH reading of 7, you should .

bottom blow the boiler

treat the water with caustic soda

treat the water with chemical scavengers

reduce the water alkalinity to recommended readings

316

If carbon accumulates on a pyrometer thermocouple, it will cause .

the pyrometer to overheat and burn

the pyrometer to read low

the exhaust passage to become clogged

failure of the hot junction

317

If control air systems are supplied from starting air receivers, the capacity of the receivers should be sufficient .

to provide for intermittent starting procedures

for continued operation of these systems after capacity for the required number of consecutive starts has been used

to provide a nonreversible engine a minimum of twelve consecutive starts

to enable six consecutive starts of a reversible engine

318

If cooling water flow through the after cooler is interrupted, the power output of a turbocharged diesel engine will drop because the .

turbocharger will stall

density of the air charge will decrease

scavenge effect will increase

exhaust pressure will increase

319

If governor Item #10 in the illustration were to break on a main propulsion diesel engine operating under full load, the engine RPM will .

remain the same until the over speed trip actuated

decrease to a slightly lower value

hunt until stabilized by droop rod

increase until the overspeed trip actuated

320

If governor Item #19 in the illustration were to break on a main propulsion diesel engine operating under full load, the engine RPM will .

increase until the overspeed trip actuated

hunt until stabilized by droop rod

decrease to a slightly lower value

remain the same until manually changed

321

If governor Item #19 were to break on a main propulsion diesel engine operating under full load, the engine RPM will .

remain the same until manually changed

decrease to a slightly lower value

hunt until stabilized by the droop rod

increase until the overspeed trip actuates

322

If oil is dripping from the burner of a coil-type auxiliary steam generator, the cause may be .

the oil valve not seating properly

a loose burner nozzle

carbon on the burner nozzle causing deflection of oil spray

all of the above

323

If over a period of weeks the air-box pressure of a turbocharged, diesel engine, operating at full load, appears to be dropping off, the cause can be .

open air-box drains

loss of cooling water to the diffuser

gradual fouling of the air filters

improperly timed exhaust valves

324

If poor combustion occurs in an auxiliary boiler due to an air damper linkage being out of adjustment, you would adjust the linkage and then .

reset the pressure limit controls

test the high and low fire solenoids

check the photocell window for carbon deposits

check the burner ignition electrode gap

325

If the a main propulsion diesel engine governor works irregularly with a jerking motion, a possible cause can be .

a sticking fuel control linkage

a malfunctioning overload cam

an unlocked overspeed trip

floating valves

326

If the auxiliary diesel engine will not shut down, the trouble could be .

high lube oil pressure

high firing pressure

lube oil leakage into the blower

high fuel oil pressure

327

If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number the .

acidity has increased

viscosity has decreased

demulsibility has improved

foaming is guaranteed to occur

328

If the combustion control system of an automatically fired auxiliary boiler fails to relight the burner after a normal shutdown, you should check for a/an .

low steam pressure

high voltage on the ignition electrode

open air damper

faulty photocell detector

329

If the combustion control system of an automatically fired auxiliary boiler fails to restart from the normal shutdown mode, you should check for .

broken or grounded high tension leads

a faulty ignition cable connector

an incorrect electrode setting

all of the above

330

If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition after a normal shutdown, you should check for a/an .

faulty photocell detector

low steam pressure

high voltage on the ignition electrode

open air damper

331

If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .

have a larger than normal dead band

produce excessive speed response to a load change

respond slowly to any change in engine load

stabilize engine speed at the new governor setting

332

If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be .

high steam pressure in the boiler

abnormally high feed water temperature

abnormally high boiler water temperature

steam demand exceeding feed pump capacity

333

If the fire goes out in an automatically fired auxiliary boiler and the burner continues to supply fuel, there is a potential danger of .

overpressure and dry firing

a severe furnace explosion

spalling damage to the brickwork

heat damage to the atomizer

334

If the flame of an automatically fired auxiliary boiler tends to move away from the burner tip when the firing rate is changed from low to high, you should .

decrease the fuel pressure

adjust damper linkage to slow the opening rate of the dampers

adjust damper linkage to lengthen the purge period

adjust the photocell to observe the new flame position

335

If the fuel/air ratio in an automatically fired auxiliary boiler is insufficient, the result could lead to .

inefficient combustion

dark smoke

automatic shutdown

all of the above

336

If the input signal rises above the set point of '17A', shown in the illustration, but remains below the set point of '17B', the output from '22A' will .

be the same as the set point of '17B'

indicate a pressure on '67B' equal to the set point of '17A'

indicate a pressure on '67A' equal to the input of '17A'

improve to a steady state when moisture is removed from the system

337

If the instrument sensing element, shown in the illustration, became coated with foreign matter, which of the listed conditions would be likely to occur?

Immediate damage to the porcelain insulator.

High temperatures developing in the exhaust.

Damage to the pyrometer.

Inaccurate temperature readings.

338

If the intake, or exhaust valve stem clearance is found to be excessive, in addition to too little movement of the rocker arms, you should check for .

collapsed hydraulic valve lifters

loose valve spring locks

worn valve seats

broken valve springs

339

If the load on a diesel engine equipped with an isochronous hydraulic governor is increased, after compensation is performed by the governor, the engine speed will .

remain the same

increase

decrease

fluctuate

340

If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may suspect a .

clogged intake air intercooler

control air leak

leaking air starting valve

malfunctioning governor

341

If the peak to peak pressure pulsation in the diesel engine fuel injection return piping exceeds 285 psi what special provision is to be provided?

The piping shall be shielded and secured to prevent fuel or fuel mist from reaching a source of ignition on the engine or its surroundings.

The piping shall be directed to the fuel oil day tank, in addition it shall enter below the normal operating level of the tank.

Most diesel injection systems do not develop high pressures in their return lines due to regulations prohibiting installation of valves in these lines.

Return piping is required to be protected by relief valves which relieve to the diesel oil settling tank.

342

If the rated distillate production of a submerged tube type evaporator cannot be maintained with the maximum jacket water flow rate, the evaporator .

chemical feed must be increased

has a serious brine leak

temperature switch is defective

heating surfaces are scaled

343

If the speed of a turbocharged diesel engine is maintained constant as the load on the engine is increased, the speed of the turbocharger will .

decrease until the engine speed increases

increase

decrease

remain unchanged

344

If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will .

decrease until the engine speed increases

increase as the load increases

decrease as the load increases

remain unchanged as the load decreases

345

If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engine RPM will .

increase until the overspeed trip actuated

hunt until stabilized by the droop rod

decrease to a slightly lower value

remain the same until manually changed

346

If the turbocharger failed on an auxiliary four cycle diesel engine, which of the following conditions would probably occur?

Full power cannot be developed.

The exhaust will contain black smoke at full load.

Complete combustion will be impossible at full load.

All of the above.

347

If the turbocharger of a four-stroke/cycle diesel engine fails to operate properly, which of the following statements best describes the probable effect?

Intake manifold pressure will be high.

Intake manifold pressure will be unaffected.

Exhaust temperatures will be high.

Exhaust temperatures will be low.

348

If the valve lash on a diesel engine is set improperly, which of the following statements represents the most serious problem that can develop?

Too little lash will cause noisy operation and excessive wear.

Too much lash will cause the valve to open early and close late.

Too little lash may prevent the valves from seating properly.

Too much lash may prevent combustion through loss of compression.

349

If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will .

open late and close early

open late and close late

fail to open when the engine is cold

fail to open at normal operating temperature

350

If there is a 'clicking' sound in the valve compartment of a diesel engine, the cause may be .

a worn wrist pin

excessive valve lash

worn connecting rod bearings

all of the above

351

If you hear a 'crackling' noise while standing watch in the engine room coming from a centrifugal pump within a general service system, the most probable cause of the problem would be .

insufficient speed

cavitation

excess discharge pressure

excessive net positive suction head

352

If you hear a 'crackling' sound while standing watch in the engine room coming from a centrifugal pump casing within a general service system, the most probable cause of the noise would be .

insufficient packing

an oversized lantern ring

excessive suction lift

reversed pump rotation

353

If you hear a 'crackling' sound while standing watch in the engine room occurring within a general service system centrifugal pump, the most probable location of the noise would be the .

shaft sleeves

shaft packing gland

wearing rings

pump suction

354

If you hear a 'crackling' sound while standing watch in the engine room occurring within a general service system centrifugal pump, the most probable location of the noise would be the .

shaft sleeves

discharge volutes

wearing rings

pump suction

355

If you increase the clearance between a valve stem and rocker arm, which of the listed conditions will occur?

Valve will open later.

Valve will close later.

Amount of fuel injected will be increased.

Amount of fuel injected will be decreased.

356

If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should .

check the air filter for obstruction

check for an exhaust leak

check the exhaust temperature

secure the engine

357

If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be .

a glazed surface on the spring

nicks in the protective coating

a buildup of sludge deposits

cracks in the surface of the spring

358

Ignition failure in an automatically controlled auxiliary boiler can be caused by .

carbon deposits on the electrode

excessive fuel oil temperature

excessive return oil pressure

brickwork failure

359

Ignition failure in an automatically controlled auxiliary boiler could be caused by .

carbon deposits on the flame scanner

high fuel oil temperature

low fuel oil viscosity

high steam pressure

360

Ignition failure in an auxiliary boiler can be caused by .

carbon deposits on electrodes

a jammed open oil solenoid

excess fuel pressure at the nozzle

an excessively long purge cycle

361

Improper maintenance of an automatic auxiliary boiler oil burner could result in .

fuel pump failure

fan motor failure

increased feed water consumption

decreased boiler efficiency

362

Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in .

increased fuel consumption

increased feed water consumption

fuel pump failure

combustion control system failure

363

In a coil-type auxiliary water-tube circulation boiler .

unevaporated feed water collects in the bottom of the flash chamber

all generated steam is recirculated through heating coils in the boiler

heated water flashes to steam in the boiler heating coils

response to steam demand is slower than in a fire-tube boiler

364

In a coil-type forced circulation auxiliary water-tube boiler .

steam is recirculated through heating coils in the boiler

hot water flashes to steam in the flash chamber

unevaporated feed water is lost through the atmospheric vent

response to steam demand is slower than in a fire-tube boiler

365

In a coil-type forced circulation auxiliary water-tube boiler, .

steam demand response is comparatively rapid

steam is recirculated through heating coils in the boiler

unevaporated feed water is discharged through the skim tube

steam demand response is slow

366

In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in .

increased engine back pressure

sulfuric acid corrosion

surface pitting of the turbocharger compressor blades

moisture impingement on the turbocharger compressor blading

367

In a diesel engine, a leaking exhaust valve can cause .

misfiring

preignition

interrupted scavenging

reduced scavenging

368

In a diesel engine, exhaust valves open before the intake ports are uncovered to . I. reduce pumping losses II. reduce back pressure

I only

II only

both I and II

neither I nor II

369

In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with .

low firing pressure

low exhaust temperature

mechanical knock in each cylinder

fuel knock in each cylinder

370

In a fire-tube auxiliary boiler, you should expect to find the thickest scale on the waterside of the .

crown sheet

through stays

hydrokineter

belly plug

371

In a forced circulation auxiliary boiler, steam is formed in the .

heating coils

steam accumulator (flash chamber)

hot well

thermostat tube

372

In a four-stroke/cycle diesel engine, badly worn intake valve guides can cause excessive .

exhaust pressure

exhaust temperatures

cooling water temperatures

lube oil consumption

373

In a four-stroke/cycle diesel engine, the intake valves open .

before TDC and close after BDC

after TDC and close after BDC

before TDC and close before BDC

after TDC and close before BDC

374

In a Kingsbury thrust bearing, the thrust shoes are .

pivoted, and the thrust collar turns with the shaft

turned by the shaft, and the thrust collar is stationary

lubricated by a ring oiler

hard chrome-faced to withstand wear

375

In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the .

governor droop

speeder spring tension

fuel rack lag

load on the engine

376

In a multi-cylinder, constant pressure, turbocharged diesel engine, the combined exhaust temperature at the turbocharger inlet reads higher than the individual cylinder exhausts. This means the .

combined exhaust pyrometer is defective

combined exhaust pyrometer is reading normally

turbine blades are coated with carbon

turbine is overheating

377

In a naturally aspirated diesel engine, the volume of air intake is directly affected by engine .

compression ratio

fuel pressure

speed

cylinder clearance volume

378

In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine .

compression ratio

displacement

fuel pressure

cylinder clearance volume

379

In a naturally aspirated diesel engine, the volumetric efficiency of the intake air charge is mainly influenced by the .

compression ratio

valve size

fuel injection pressure

cylinder mean effective pressure

380

In a Roots-type rotary blower, the volume of air delivered is directly proportional to .

engine speed

engine load

brake horsepower

brake specific fuel consumption

381

In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the .

power piston

governor sump

spring-loaded piston accumulator

pressure pilot valve assembly

382

In a simple mechanical governor, the .

centrifugal force rotates the ball-head

flyweight centrifugal force is balanced by spring force

flyweight centrifugal force is balanced by hydraulic pressure

speeder spring alone actuates the fuel control rod

383

In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to .

produce a scavenging effect in the combustion space

equalize cylinder and exhaust manifold pressures

alleviate the difference in valve size between the intake and exhaust

flush out condensate that collects after each compression stroke

384

In a turbocharger, inlet air velocity is increased in the .

inlet nozzle ring

stationary diffuser passages

compressor outlet volute

rotating impeller vanes

385

In a two 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

386

In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the .

exhaust manifold

valve bridge

pressure of the fresh air charge

valve adjusting gear

387

In a two-stroke/cycle diesel engine, the process of scavenging begins as the .

piston nears and passes TDC

latter part of the downstroke

piston passes BDC

early part of the downstroke

388

In accordance with Coast Guard Regulations (46 CFR) regarding internal combustion engine exhaust manifold installations, which of the following statements is true?

They must be fitted with a backfire flame arrester constructed in accordance with the specification regulations.

They cannot be located any closer than six inches from flammable materials such as woodwork, etc.

They may be water- jacketed and cooled by the discharge from a pump which operates only when the engine is running.

They must be fitted with one inch thick asbestos board and covered with #26 USCG galvanized sheet iron.

389

In accordance with Coast Guard Regulations (46 CFR), water level controls utilized in a small automatically fired auxiliary heating boiler, shall be tested .

by simulation only to prevent possible boiler damage due to a low water condition

every time the boiler is being secured for an extended lay up period

with a stop watch to verify shutdown times

by slowly lowering the boiler water level

390

In accordance with Coast Guard Regulations (46 CFR), 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.

391

In addition to the normal governor, each main engine having a maximum continuous output of 300 hp and over, which can be declutched or which drives a controllable pitch propeller, .

is not required to have any additional overspeed protection provided a hydraulic governor is used

and is a direct reversible engine, is required to have an overspeed trip set to secure the fuel to the engine when its rated speed is exceeded by more than 15 percent

is to be fitted with a separate overspeed device so adjusted that the speed cannot exceed the maximum rated speed by more than 20 percent

will not require any additional overspeed protection provided a mechanical type governor is used

392

In an automatically fired auxiliary boiler, restarting from the normal shutdown cycle in response to steam demand, is initiated by a/an .

modulating pressuretrol, sensing both steam pressure and temperature

pyrostat measuring decreased steam temperature

pressuretrol measuring only the steam pressure

electrode sensing water level

393

In an auxiliary boiler steam and water system, the highest pressure will be in the .

steam stop valve

dry pipe

feed water system

generating tubes

394

In an electromagnetic coupling, torque to the driven shaft is limited by the .

overload trip

coupling pullout value

staybolt strength

shear-off coupling

395

In an electromagnetic slip coupling, the slip .

reduces magnetic pull caused by non- concentric electromagnets

reduces resonance and accentuates the turning moment irregularities

transmits electromagnetic flux through the primary circuit

generates the low frequency current which excites the secondary electromagnet

396

In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy mild steels because .

the beveled edges of the intake valves provide for self-centering during seating

intake valves utilize stellite-coated valve seat inserts which reduce wear

the effective volume of air passing through intake valves is less than the effective volume of air passing through exhaust valves

intake valves operate at lower temperatures due to the cooling effect of the intake air flow across the valve

397

In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because .

the beveled edges of the intake valves provide for self-centering during seating

intake valves utilize stellite-coated valve seat inserts which reduce wear

the effective volume of air passing through intake valves is less than the effective volume of air passing through exhaust valves

intake valves are less affected by the corrosive action of exhaust gases

398

In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because .

the beveled edges of the intake valves provide for self-centering during seating

intake valves utilize stellite-coated valve seat inserts which reduce wear

the effective volume of air passing through intake valves is less than the effective volume of air passing through exhaust valves

intake valves operate at much lower temperatures and are less affected by the corrosive action of exhaust gases

399

In comparison to straight flow mechanical atomizers, return flow atomizers provide relatively uniform atomization over a wide firing range due to the .

back pressure regulation resulting in more complete combustion at high firing rates

oil supply pressure not having to be reduced at low loads to the point where poor atomization occurs

return flow atomizer being designed for best combustion at low firing rates

rotational motion imparted by the tangential slots being greater in the return flow atomizer

400

In general, diesel engine waste heat boiler construction is usually of the .

cyclone furnace boiler type

dry back boiler type

water-tube type

critical circulation boiler type

401

In most marine single reduction gear units, the bull gear is driven by the .

quill shaft

helical gear

pinion gear

differential gear

402

In order for the governor shown in the illustration to correct for the increase in load placed on the governed engine, the .

pilot valve initially moves up

pilot valve initially moves down

accumulator pressure is applied to the full exposed surface area of the power piston

actuating compensating piston rotates the terminal shaft in the increase fuel direction

403

In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?

The safety valve escape piping should be disconnected from the valve body and a blank inserted.

The boiler vent valves should be opened.

All handhole/manhole covers should be tightened up as much as possible to preclude any leaks.

All of the above.

404

In reducing engine speed to an efficient propeller speed by the use of reduction gears, .

speed and torque are both reduced

speed is reduced and torque remains unchanged

speed is reduced and torque is increased

speed is sometimes unchanged while torque is increased

405

In the cylinder head of a two-stroke/cycle diesel engine, valves are used for .

air intake

a fuel outlet

cooling water inlets

exhausting combustion gas

406

In the diesel engine shown in the illustration, the purpose of the part labeled "P" is to .

cool the scavenge air

ensure one way air flow into the air header

boost the scavenge air pressure

provide turbulence in the scavenge air

407

In the event of a flame failure in an auxiliary water-tube boiler, you must .

relight the boiler immediately to prevent loss of steam pressure

relight the fire off the brickwork as long as the bricks are cherry red

purge the furnace of any combustible gases before attempting to relight the fire

speed up the feed pump to prevent dry firing when the burner flame is reestablished

408

In the illustrated auxiliary diesel engine governor, decreasing the distance between piece #6 and piece #10 will affect the engine by .

decreasing the speed

increasing the speed

increasing the speed droop setting

decreasing the overspeed trip setting

409

In the illustration, If gear A has 72 teeth, gear B has 64 teeth, gear C has 24 teeth and gear D has 36 teeth, what is the RPM of the gear D if gear A is turning at 100 RPM?

275.88 RPM

400.63 RPM

533.33 RPM

673.51 RPM

410

In the large, slow-speed, loop-scavenged main propulsion diesel engine shown in the illustration, the upward motion of the piston draws in scavenging air into the piston undersides through .

venturi tubes

non-return scavenging air valves labeled "P"

cylinder ports "T"

the component labeled "U"

411

In the large, slow-speed, main propulsion diesel engine shown in the illustration, the upward motion of the piston draws scavenging air through .

venturi tubes

non-return valves

an auxiliary cold start heater core

the component labeled "U"

412

In the operating cycle of a four-stroke/cycle diesel engine, blow down to exhaust manifold pressure must occur before the piston begins the exhaust stroke to minimize .

pressure losses

exhaust pulsations

excessive scavenging

pumping losses

413

In the positive displacement rotary supercharging blower illustrated, where does the air become compressed?

Between the rotating blower lobes.

Between the casing and blower lobes.

After the engine reaches operating speed.

As air moves into the discharge passage.

414

In the reduction gear set shown, the output shaft is identified as number .

1

2

3

4

415

In the reversing reduction gear shown in the illustration, the forward and reverse main pinions are in constant mesh with the main gear. This means the .

set that is clutched in will rotate as idlers driven from the main gear

idling gears rotate in a direction opposite to their rotation when carrying load

synchromesh coupling will maintain transition torque control

clutches are engaged by a reduction in control air pressure

416

In the rotary blower shown in the illustration, which direction of rotation do the rotors turn?

Both turn clockwise

"A" turns clockwise; "B" turns counterclockwise

"A" turns counterclockwise; "B" turns clockwise

Both turn counterclockwise

417

In the schematic diagram of the isochronous hydraulic governor shown in the illustration, piece #22 is the .

pilot plunger

proportioner piston

balance piston

differential servo piston

418

In the set of reduction gears shown in the illustration, what type of bearing is used?

Ball

Babbitt

Sleeved

Tapered roller

419

In the turbocharger shown in the illustration, the engine exhaust line would be connected to the part labeled .

B

C

H

E

420

In the water level electrode assembly, shown in the illustration, the feed pump should restart when the level of the water reaches the position indicated by arrow ' '.

E

B

C

D

421

In the water level electrode assembly, shown in the illustration, the leads indicated by letter "F" would be wired to the .

modulating pressuretrol

feed pump controller and pyrostat

feed pump controller and burner circuit

burner circuit and feed water regulator

422

In using reduction gears to obtain efficient propeller speeds, .

they must be located at the after end of the engine

they can only be used with one engine at a time

they eliminate the need for controllable pitch propellers

they are connected to the engine with a flexible coupling to compensate for misalignment

423

In which of the following areas of a crosshead engine is a permanently connected fire extinguishing system required?

Exhaust manifolds in excess of eight inches in diameter.

Crankcases having a gross volume in excess of 21 cubic feet.

Turbocharger inlet piping in excess of twelve inches in diameter.

Scavenging spaces in open connection to the cylinders.

424

Increasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening .

later and closing earlier

later and closing later

earlier and closing earlier

earlier and closing later

425

Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially .

increase

decrease

fluctuate

remain constant

426

Increasing the oil pressure acting on the power piston of the hydraulic governor shown in the illustration will .

require the overspeed trip setting to be adjusted

increase the governor output power

increase the speed droop

decrease the speed droop

427

Increasing the valve clearance between a valve stem and rocker arm, will result in the valve .

closing later

opening sooner

staying open for a shorter period of time

staying open for a longer period of time

428

Individual cylinder performance in a diesel engine is routinely determined by exhaust gas .

chemical analysis

pressure readings

pyrometer readings

infrared analysis

429

Intake air flow from a diesel engine turbocharger is directly proportional to engine .

exhaust gas pressure

exhaust gas temperature

speed

load

430

Internal combustion engine crankcase vent outlets must be equipped with .

hinged rain guards

corrosion resistant flame screens

dipsticks for measuring oil levels

crankcase ventilation fans

431

Internal combustion engines are to be fitted with governors to prevent the engines from exceeding the rated speed by more than .

10 percent

15 percent

20 percent

25 percent

432

Irregular feeding or surging of the feed water supply to a low pressure distilling plant may be attributed to .

erratic water flow through the air eductor

a clogged vent line from the air eductor condenser

excessive pressure in the seawater feed heater

a dirty strainer in the saltwater feed pump suction line

433

It is desirable for an auxiliary boiler safety valve to pop open and reseat firmly to .

give warning that excessive boiler pressure has been reached

prevent wire drawing of the disc and seat

prevent valve pounding

provide sufficient blow down

434

Item "A" in the illustration is a/an .

indent operated, four position, four-way valve

lever operated, infinite position, four-way valve

manually operated, detented, four position, four-way valve

pneumatically operated, infinite position, reducing valve

435

Item "F" shown in the illustration is called a .

flow limiting device

relief valve

pressure reducer

sequencing valve

436

Kingsbury thrust bearings are lubricated by .

flooding the thrust bearing assembly with oil

submerging oil wiper rings in an oil bath

pressure lubricating through internal passages

spraying oil directly on the thrust collar and shoes

437

Large steam drums are not required in the design of a coil- type auxiliary water-tube boiler because .

steam and water are separated in the accumulator (flash chamber)

the heat of combustion is sufficient to remove all moisture from the steam

the volume of steam is small at low pressures

automatic burner cycling controls steam volume and quality

438

Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the .

exhaust gas temperature system

exhaust load system

constant or pulse pressure system

constant volume system

439

Late fuel injection in a diesel engine is indicated by black or gray exhaust smoke with a .

low firing pressure

low exhaust temperature

mechanical knock in each cylinder

low compression pressure

440

Late fuel injection in a diesel engine is indicated by low firing pressure with .

high exhaust temperature

low exhaust temperature

fuel knock in each cylinder

mechanical knock in each cylinder

441

Late fuel injection in a diesel engine is indicated by low firing pressure with .

low exhaust temperature

low exhaust pressure

mechanical knock in each cylinder

black or gray exhaust smoke

442

Leaking oil seals on a diesel engine turbocharger can cause .

the engine to run after the fuel has been secured

the engine to overspeed

a fire

all of the above

443

Loop,' 'uniflow,' 'crossflow,' and 'return-flow' are terms used to describe various types of .

control air circuits

supercharging

turbochargers

scavenging

444

Main propulsion diesel engines having a bore exceeding 300 mm are to have at least .

two independent means of starting the engine

five air starting valves to permit the admission of starting air at any crank angle

one (explosion relief) valve at the position of each main crank throw

two engine driven lube oil pumps capable of parallel operation

445

Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the .

air charge density becoming too high

piston crown surfaces becoming too cold

formation of excessive quantities of condensate

compression pressure being greatly reduced

446

Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to .

provide added wear protection against today's corrosive quality of fuel

increase overall valve strength due to the high gas pressures

assist in dissipating heat due to the extreme operating temperatures

reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering

447

Marine diesel engine dry-type mufflers reduce noise by .

using phase adjusters

decreasing back pressure at the exhaust manifold

allowing gases to expand and change direction of flow

constant pulse charging at the exhaust manifold

448

Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or .

inside micrometer

feeler gage

adjustable trammel

sighting device

449

Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or .

inside micrometer

feeler gage and straight edge

adjustable trammel

sighting device

450

Most Roots-type blowers have two rotors which .

are extremely quiet at high speed

rotate in the same direction

rotate in opposite directions

decrease objectionable turbulence in the cylinders

451

Multiple concentric valve springs are often used with diesel engine valves to .

enable research and development of cam contour to be simplified

operate the valve gear where a larger force is normally required, but space limitations restrict the use of a single large spring

allow for easier valve replacement

enable a total smaller valve spring force to keep the valve tight on its seat

452

Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by .

collapsed hydraulic valve lifters

worn valve guides

excessive crankcase vacuum

excessive lube oil pressure

453

On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the .

accumulator spring compression

balance piston

compensating needle valve

proportional piston

454

On a diesel engine equipped with a Roots-type blower, .

the turbine speed depends on engine load

the air is compressed in the air cleaner

the blower speed is proportional to the engine speed

the blower lobes are lubricated by the engine lube oil

455

On a diesel engine equipped with an isochronous governor, if the 'speed droop' control is reduced to the 'zero' setting, the engine .

speed will drop drastically with any increase in load

will stop due to zero fuel supply

will stall upon application of load

speed will remain fairly constant despite load changes

456

On a four-cycle diesel engine, the valve subjected to the most severe conditions during normal service is the .

cylinder exhaust valve

air starting valve

air inlet valve

cylinder relief valve

457

On a large diesel engine installation, crankshaft axial alignment is maintained by the .

piston rod guides

engine thrust bearing

crosshead bearing

main shaft flexible coupling

458

On a turbocharged, medium-speed, diesel engine, which of the following problems is an indication of a restricted air intake passage?

engine is hard to start

engine misses

surges at governed RPM

coolant temperature is too low

459

On an automatically fired auxiliary boiler, the steam pressure limit switch is wired into the burner electric circuit to .

sound an alarm when the burner is shut off

energized the flame scanner circuit when high boiler pressure is reached

shut off the burner when the cutoff pressure is reached

prevent burner operation in the event of low boiler water level

460

On most diesel engines, the governor controls the output speed by .

controlling the amount of fuel injected into the cylinders

varying the speed of the turbocharger

adjusting the compression ratio

changing the timing of the fuel injection camshaft

461

One advantage of electromagnetic slip couplings is .

torsional vibrations are reduced

torque increases with a decrease in excitation current

the coupling rapidly responds to sudden changes of load

excitation and induction power losses appear as a change in torque instead of rotational speed between the primary and secondary elements

462

One advantage of hydraulic clutches over mechanical clutches in diesel engine installations is .

the power is transmitted at a very high efficiency of 60%

the torsional vibrations are transmitted directly to the reduction gears

each clutch has a separate oil gland for reverse operation

no mechanical connection exists between the driving and driven elements

463

One characteristic of a pulse type turbo charging system is .

high average exhaust manifold pressure

greatly fluctuating inlet manifold pressure

constant exhaust manifold pressure

multiple exhaust pipes to the turbocharger

464

One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the .

governor sensitivity

exhaust temperature

fuel injection pressure

speed of the cam shaft

465

One of the most common causes of reduction gear failure is gear wear caused by scoring as a result of .

surface fatigue of the gears

an inadequate lube oil film

plastic flow of the gears

fretting corrosion from water contamination

466

One of the purposes for water cooling the exhaust manifold in marine diesel engine is to .

reduce lube oil temperature

raise exhaust temperature

reduce excessive heating of engine room

reduce load on cooling water pump

467

One operating characteristic of the reversing reduction gear unit, shown in the illustration, is that once a clutch is engaged, the .

engine torque is normally transmitted to the propeller shaft without slip

slip is produced by backlash in the thrust bearings

second clutch may be engaged for additional torque

idle clutch is fully expanded to hold its gear train stationary

468

One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to .

increase scavenge air pressure

reduce fuel booster pump pressure

adjust the fuel rack

retard fuel injector timing

469

Operating a diesel engine under light loads and at low temperatures for an extended period can result in .

formation of carbon on the intake and exhaust ports

high water jacket temperatures

overheated pistons and cylinders

an increase in lube oil viscosity due to fuel dilution

470

Operating a low speed propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in .

decreased fuel consumption per brake horsepower

more complete cylinder scavenging

extended valve life

excessive carbon formation in the combustion chamber

471

Overfiring of a hot water boiler may be caused by .

dirty atomizers

faulty limit controls

high water level

flame failure

472

Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with .

sodium sulfite or hydrazine

hygroscopic sulfite

bromine

hygroscopic bromide

473

Partially obstructed exhaust ports on a diesel engine can cause .

overheating of the engine

high exhaust temperatures

sluggish engine operation

all of the above

474

Performance of a turbocharged engine can be improved by .

decreasing the amount of valve overlap

preheating the air intake

aftercooling the intake air

preheating light fuels

475

Piping from booster pumps to injection systems are to be at least .

schedule 60

schedule 80

standard seamless steel

none of the above

476

Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with .

excessive speed

improper warm-up

extreme misalignment

inadequate lubrication

477

Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by .

corrosion on the gears

excessive gear speed

dirt in the oil

misalignment of the gears

478

Prior to lighting off a cold automatically fired auxiliary boiler, you should .

check and regulate the water level

close the air cock once fires are lit

preheat the diesel oil to assist atomization

tighten the steam stop to prevent steam leakage

479

Propeller shaft Kingsbury thrust bearings are normally lubricated by . I. a totally flooded housing II. oil spray on collar and shoes

I only

II only

either I or II

neither I nor II

480

Proper operation of the main engine reduction gear set requires the operator to monitor .

the sump oil level

oil flow sight glasses

bearing temperatures

all of the above

481

Provision is to be made for ventilation of an enclosed diesel engine crankcase by means of a small .

aperture not exceeding 1" in diameter

fan to develop a slight suction not exceeding 1" of water

vent line attached to the upper most area of the crankcase near the center of the engine

breather or by means of a slight suction not exceeding 1" of water

482

Pyrometers commonly found on diesel engine exhaust systems, consist of .

pyrostats and a voltmeter

a gas-filled bellows, a tube and a pressure gauge

thermocouples and a voltmeter

ammeters and thermocouples

483

Reducing the clearance between a valve stem and rocker arm will result in the valve .

having a shorter duration of opening

having a longer duration of opening

closing sooner

opening later

484

Reduction gear casings are vented in order to .

allow windage to exist for cooling the gears

avoid a buildup of pressure within the gear case

minimize lube oil foaming within the case

allow for axial clearance between the gears

485

Reduction gear lube oil temperatures for keel cooler installations are generally .

lower than raw water cooled installations

higher than raw water cooled installations

identical to raw water cooled installations

lower than raw water cooled installations, but the pressure will be higher

486

Regarding a diesel engine crankcase, the general arrangement and installation should preclude the possibility of .

free entry of air to the crankcase

water entering the crankcase while engine wash downs are being performed

excessive oil leakage during periods of increased blow by

subcooling internal components

487

Regarding the positive displacement rotary blower shown in the illustration, air compression takes place .

between the rotating blower lobes

between the casing and blower lobes

after the engine reaches operating speed

as air moves into the discharge passage

488

Regarding the turbocharger shown in the illustration, the piece labeled "F" is a .

variable inlet guide vane

fixed blade

moving blade

silencer

489

Regarding the turbocharger shown in the illustration, the diffuser ring of the blower is indicated by the letter .

D

F

H

N

490

Regarding the turbocharger shown in the illustration, the part labeled "B" would be attached to the .

exhaust manifold

silencer outlet

after cooler inlet

nozzle ring

491

Regarding the water level electrode assembly shown in the illustration, arrow "C" indicates the point at which the .

feed pump starts

feed pump stops

fuel oil solenoid is de- energized

normal water level is established

492

Regarding the water level electrode assembly shown in the illustration, normal water level would be indicated .

midway between arrows "B" and "C"

at arrow "B"

at arrow "C"

at arrow "D"

493

Regarding the water level electrode assembly shown in the illustration, the normal water level will ordinarily rise and fall between .

"B" and "C"

"C" and "E"

"B" and "E"

"B" and "D"

494

Regulator'17B' shown in the illustration, is set for a constant output of 1.2 bar and the input signal to "1" is currently 0.42 bar. If the output from '17A' can not exceed 0.85 bar, then the current output from "2" should be .

0.35 bar

0.42 bar

0.85 bar

2.05 bar

495

Routine monitoring of a diesel engine should include .

checking for leaks

checking temperatures and pressures

listening for abnormal noises

all of the above

496

Salinity cells are strategically installed in distilling units to indicate the .

quantity of the distillate produced

quality of the distillate produced

presence of saltwater leaks into the flash chamber

all of the above

497

Scavenging in a four-stroke/cycle diesel engine occurs during the .

last part of the exhaust stroke, and the first part of the intake stroke

last part of the intake stroke only

early part of the injection stroke only

early part of the power stroke

498

Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished .

during the valve overlap period

with only the exhaust valve open

at a pressure below atmospheric

without cooling the cylinders or pistons

499

Sensitivity for a diesel engine governor is described as the .

governor's speed droop response to variations in engine load

ability to maintain desired engine speed without speed fluctuation

percent of speed change necessary for corrective action by the fuel control

ability to maintain constant speed regardless of engine load

500

Slippage of an air-operated friction clutch can result from .

an overloaded engine

prolonged slow speed operation

weak disc springs

newly installed friction blocks

501

Some automatically fired auxiliary boilers are equipped with the water level electrode assembly shown in the illustration. In this type of water level control, the burner circuit is completed through the .

third leg of the water level electrode assembly

ungrounded neutral leg of the control circuit

water in the boiler drum and electrode assembly

magnetic field surrounding the water level electrode assembly

502

Some diesel engines are equipped with a Roots-type blower to provide .

more air to combine with the fuel

more amps per kilowatt hour

higher no-load RPMs

higher voltage output

503

Some diesel engines are supercharged with a .

slam charger

turbocharger

fuel atomizer

fuel injector

504

Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed. In most reduction gears, the bull gear .

must be partially submerged in the lube oil sump for proper lubrication

is connected to the propeller shaft

is driven at the highest RPM

compensates for alignment variations between the engine and pinion gear

505

Spring surge in diesel engine valve springs can result in .

increasing effective spring force

bouncing of the valve gear

splitting of the valve keeper collars

failure of the valve to open

506

Subtracting the return flow meter reading from the supply flow meter reading on a boiler equipped with a return flow fuel oil system, determines the amount of oil .

circulated by the system

burner throughput

returned to the settler

discharged from the pump

507

The 7 bar control air supply shown in the illustration has failed. Which of the following statements represents the automatic action that will occur?

The pressure switch, labeled as "C", will energize the automatic shutdown circuitry, preventing any additional operating casualty.

Valve "D" will shift to the position shown, with the signal generated from line 'ff' determining the speed of the engine, as the signal is modified by device "A".

By regulating the reduction of the 30 bar air pressure at device "B", the engine speed may be varied proportionally, operating independently of any other control.

Valve "D" will shift, no longer venting line 'cc', 30 bar air pressure is reduced by "B", and is supplied to "A" for speed control, and other functions of lines 'cc' and 'ff'.

508

The ability of the governor to prevent fluctuations in engine speed is termed .

sensitivity

stability

promptness

speed droop

509

The ability of the governor to prevent fluctuations in engine speed is termed .

load limit

stability

promptness

speed droop

510

The air bladder clutch used with some reversing reduction drive gears, consists of .

twin-disk clutch plates

jaw-type clutch plates

multi-plate friction plates with sliding collars

two independent clutches

511

The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an .

air compressor

diffuser

after cooler

venturi

512

The amount of chloride content in the water of an auxiliary boiler can be reduced by .

adding hydrazine

blowing down the boiler

adding phenolphthalein

adding a sulfite chloride scavenger

513

The amount of fuel oil atomized by a return flow oil burner is directly controlled by the .

header supply valve

burner root valve

oil micrometer valve

fuel oil back pressure

514

The amount of oil atomized by the return flow variable capacity atomizer, used with some automatically fired boilers, is controlled by the .

amount of air admitted to the atomizer

oil pressure in the oil return line

quantity of oil delivered by the service pump

proportioning device in the atomizer fuel valve

515

The amount of oil consumed by a return flow-type fuel atomization system, fitted with both supply and return meters, can be determined by the .

supply meter reading only

return meter reading only

sum of the supply and return meter readings

difference between the supply and return meter readings

516

The auxiliary boiler feed water level control shown in the illustration, utilizes .

two position differential gap action

proportional action

proportional plus reset action

proportional plus reset plus rate action

517

The average exhaust temperature of a two-stroke/cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke/cycle diesel engine at equal loads because .

two-stroke/cycle diesel engines have a higher M.E.P. than four- stroke/cycle diesel engines

two-stroke/cycle diesel engine exhaust is cooled by the scavenging air charge

four-stroke/cycle diesel engines have a higher RPM than two- stroke/cycle diesel engines

the opening of the two- stroke/cycle diesel exhaust ports or valves occurs much later than in four-stroke/cycle diesel engines

518

The average exhaust temperature of a two-stroke/cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke/cycle diesel engine at equal loads because .

two-stroke/cycle diesel engines have a higher M.E.P. than four- stroke/cycle diesel engines

four-stroke/cycle diesel engine exhaust is cooled by scavenging air

two-stroke/cycle diesel engines have a lower M.E.P. than four- stroke/cycle diesel engines

the opening of the two- stroke/cycle diesel exhaust ports or valves occurs much later than in four-stroke/cycle diesel engines

519

The axial thrust of the coupling shown in the illustration, tends to draw the runner and impeller together when the .

coupling is partially filled with fluid

clutch is operating continuously

rotor housing is full of fluid

fluid is extremely viscous

520

The bearing shown in the illustration is designed to carry thrust when applied .

left to right only

right to left only

in either direction

the bearing pictured is not designed to carry thrust

521

The best method for determining the amount of eccentricity or offset misalignment between the disconnected propeller shaft coupling flange and the reduction gear output flange is by using a .

straight edge laid across the flange edges

thickness gauge between the separated flange faces

bridge gauge to check the position of each flange in relation to the other

dial indicator mounted on one flange indicating any misalignment of the other flange

522

The boiler shown in the illustration would be classed as .

two-pass, scotch marine

single-pass, fire-tube, scotch marine

two-pass, water-tube

forced circulation, coil- type

523

The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to .

precipitate silica from solution

reduce corrosion in the heating coil

prevent clogging and erosion in the coil

maintain zero water hardness

524

The burner assembly on an automatically fired auxiliary boiler fitted with variable capacity, pressure atomizing burners, maintains steam pressure by .

cycling on and off

changing fuel oil return pressure

changing the speed of a rotary cup

varying air pressure supplied to the nozzle

525

The circuit shown in the illustration represents a/an .

pneumatic actuated, multiple position, control unit

hydraulic actuated, multi- position control unit

infinitely positioned pneumatic control

detented, control air pressure, reducing and filtering unit

526

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by .

mechanical push rods

compressed air pressure

hydraulic pressure

exhaust gas pressure

527

The clutch glands of the gear unit, shown in the illustration, rotate at .

engine speed

propeller shaft speed

an intermediate speed

a fixed speed

528

The color of the engine exhaust from a diesel propelled ship should be .

clear

hazy light brown

hazy light blue

hazy light gray

529

The color of the exhaust from a diesel engine should be .

clear

hazy light brown

hazy light blue

hazy light grey

530

The color of the exhaust gas from a diesel engine under normal load should be .

clear

hazy light brown

hazy light blue

hazy light grey

531

The compression of air in a positive displacement rotary supercharging blower, occurs only .

between the rotating blower lobes

between the casing and blower lobes

after the engine reaches operating speed

as air moves into the discharge passage

532

The concentration of dissolved solids in the boiler water of an auxiliary boiler could increase as a result of .

phosphate treatment

zero water hardness

dissolved oxygen deaeration

frequent bottom blows

533

The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of .

seawater contamination

frequent surface blows

dissolved oxygen deaeration

frequent bottom blows

534

The constant capacity, pressure atomizing, fuel oil burners designed to meet a wide variation in the steaming loads of an auxiliary boiler, are .

automatically cycled on and off in response to demand

automatically supplied with more fuel on demand

equipped with standard variable capacity atomizers

equipped with fuel nozzles having variable orifices

535

The control system for a controllable pitch propeller can be programmed . I. to produce a maximum combined propeller and engine efficiency between pitch and a given engine speed II. for continuous operation of the engine at pre-set conditions

I only is correct

II only is correct

both I and II are correct

neither I or II are correct

536

The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .

when the boiler has been secured long enough for most solids to settle

when the boiler has been cooled to ambient temperature

only after raising the water level to within 1/2 inch of the high water cutout

only after bypassing the low pressure pressuretrol

537

The daily inspection of an operating auxiliary boiler should include .

lifting of all safety valves

an examination of the boiler firesides

checking for external fuel and water leaks

measuring steam quality

538

The device most commonly used to measure the exhaust gas temperature of a diesel engine cylinder is called a .

pyrometer

calorimeter

dynamometer

tachometer

539

The device represented by the symbol "B" in the illustration is used to .

remove all moisture from the system

lubricate the air supply

reduce the temperature of the air supply as a result of the heat of compression

remove most contaminants present in the air supply

540

The device shown has been removed from an exhaust valve bridge assembly. The function of the illustrated device is to .

maintain valve lash adjustment

provide metered bypassing of lube oil in a bypass type lube oil system

act as a multi-pressure relief valve

quickly shut off fuel flow at the end of fuel injection

541

The device shown in the illustration is a .

three-way spring valve

hydraulic lash adjuster

multi-directional relief valve

valve stem spring cap

542

The device shown in the illustration is commonly used to .

provide cooling water circulation through the engine

protect the crankcase from overpressure in event of explosion

utilize the flow of exhaust gases to supercharge the engine

provide air starting pressure

543

The device shown in the illustration is utilized in some diesel control systems. If the output of "2" is directed to the engine governor, what will be its primary function?

The output is for speed jumps and is utilized to ensure the transmission of stepped speed reductions.

The output of this device is used to secure the engine if it becomes overloaded.

The output shown is used to prevent torpid speed changes resulting from fluctuations of the input signal.

The pneumatic arrangement serves to prevent the engine from operating within a critical speed range.

544

The device used to limit engine torque at various engine speeds is called a .

speed limiting governor

variable speed governor

constant speed governor

load limiting governor

545

The diesel engine cylinder scavenging system illustrated is an example of .

crossflow scavenging

uniflow scavenging

loop scavenging

direct scavenging

546

The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to .

prevent engine back pressure at heavy loads

increase total engine efficiency at low loads

prevent boiler corrosion at low engine loads

improve engine fuel consumption at any load

547

The diesel engine shown in the illustration can be fitted with a pyrometer at each exhaust elbow. If one of the cylinder pyrometers is reading significantly higher than the others, which of the following should be your FIRST action?

Check the pump rack setting.

Examine the water outlet header for evidence of blockage.

Replace the fuel injector nozzle.

Examine the exhaust valves for evidence of burning.

548

The diesel engine shown in the illustration, is provided with an auxiliary blower to .

increase scavenge air pressure at full load

provide scavenge air pressure at low load

maintain a vacuum on the crankcase

maintain a positive pressure on the crankcase

549

The diesel engine shown in the illustration, the exhaust manifold is indicated by the letter .

A

B

P

U

550

The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by .

governor flyweight action on a pilot valve which controls fuel injection

governor flyweight motion acting on fuel controls through suitable linkage

positioning a butterfly valve in the fuel delivery system

positioning a servomotor piston attached to the fuel controls

551

The driving force of a propeller is transmitted to the hull through the .

bevel gear teeth

helically cut gear teeth

sleeve bearings

main thrust bearing

552

The easiest way to locate a defective diesel engine exhaust valves is by .

taking compression readings

inspecting the valves visually

comparing exhaust pyrometer readings

listening to the engine

553

The engine shown in the illustration is currently on what stroke of its mechanical cycle?

intake stroke

exhaust stroke

compression stroke

power stroke

554

The exhaust gas temperature prior to entering the turbocharger, of the system shown in the illustration, is 100- 150 (37.8-65.5C) higher than the individual cylinder temperatures. This indicates .

an exhaust valve leak

an exhaust manifold leak

the turbocharger is fouled

a normal condition

555

The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by .

pumping action of the piston

pressure of the fuel charge

vacuum developed in the manifold

pressure of the fresh air charge

556

The exhaust ports of a diesel engine using the crossflow scavenging method are opened and closed by the .

reciprocating motion of exhaust valves

rotary motion of the camshaft

reciprocating motion of the piston

developed differential

557

The exhaust ports shown in the illustration are identified with the letter ' '.

B

Q

T

U

558

The exhaust system for a diesel engine is usually designed to remove exhaust gases and to .

power the Roots-type exhauster

remove the emission of exhaust smoke pollutants

power a reciprocating supercharger

muffle exhaust noise

559

The exhaust system for a turbocharged diesel engine functions to .

power the after coolers

power the turbocharger

reduce the cylinder scavenge effect

cool the turbocharger

560

The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to .

discharge exhaust gases and smoke

furnish energy to the turbocharger

reduce engine room noise

all of the above

561

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to .

provide exhaust back pressure

prevent exhaust smoke emissions

power a reciprocating supercharger

muffle exhaust gas noise

562

The exhaust valve opens before bottom dead center in a four stroke engine to . I. allow for blow down II. reduce pumping losses

I only

II only

both I and II

neither I nor II

563

The firing order of an in-line, four-stroke/cycle, six cylinder, auxiliary diesel engine is 1-5-3-6-2-4. When the #1 cylinder is firing at top dead center, the #3 piston is .

on the intake stroke

on top dead center

on the power stroke

at bottom dead center

564

The firing range of a variable capacity, return flow-type fuel atomizer is regulated to meet steam demand by varying the .

fuel oil damper setting

fuel oil return pressure

burner register opening

atomizer orifice setting

565

The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high .

water

voltage

fuel pressure

steam pressure

566

The flame safeguard controls of a large automatically fired auxiliary boiler, may consist of a .

stack switch

pyrostat

photoelectric cell

thermistor

567

The flash chamber attached to the auxiliary boiler illustrated, .

prevents flashing of feed water in the system

regulates the eccentricity of the thermostat tube

preheats feed water entering the boiler

permits heated boiler water to flash into steam

568

The force exerted by a valve spring to close the diesel engine valves, is proportional to .

spring compression

engine speed

the natural frequency of vibration

spring surge

569

The fuel oil strainers in the fuel oil service system of an automatically fired auxiliary boiler are permitted by the Coast Guard Regulations (46 CFR) to be either the simplex type or the .

Sintered metal type

filter bag type

duplex type

absorbent type

570

The fuel oil strainers located in the fuel oil service system of an automatic auxiliary heating boiler are either the duplex type or the .

filter bag type

Perry filter type

simplex type

absorbent type

571

The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler .

steam demand is high

salinity is high

safety valve simmers

burner flame is extinguished

572

The fuel supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler .

salinity is abnormally high

steam demand is too high

water level is abnormally low

feed water flow is low

573

The function of the after cooler installed between the turbocharger and intake manifold on some diesel engines, is to .

increase the density of the intake air

decrease turbocharger power usage

reduce exhaust gas temperature

compensate for turbocharger RPM fluctuations

574

The function of the synchronizing motor on the generator governor illustrated is to .

drive the terminal shaft at a set speed

turn the governor drive shaft during start-up

provide remote control for speed adjustment

power the generator synchronizing lamps

575

The fusible plugs used in fire-tube auxiliary boilers are installed in the .

furnace

corbel header

stay tube

crown sheet

576

The gage glass on a coil-type auxiliary boiler is connected to the .

heating coil inlet and outlet

surge chamber

accumulator

water softener

577

The gear drive, shown in the illustration, can have the backlash determined best by using a .

feeler gauge

lead wire

red dye indicator

lash indicator

578

The governor controlling a diesel engine modulates crankshaft RPM by adjusting the .

intake air supply

turbocharger speed

fuel injection pumps

engine speed droop

579

The governor for an auxiliary diesel engine is shown in the illustration. Which of the pieces listed rotates proportionally to engine speed?

"1"

"3"

"21"

"22"

580

The governor for an emergency diesel generator is shown in the illustration. When a large change in load results in a change in engine speed, which of the parts listed will be the FIRST governor component to react to the change in load?

Piece #8

Piece #9

Piece #13

Piece #21

581

The governor shown in the illustration can produce shutdown of the engine by .

rotating the load limit cam

lowering the pilot valve plunger

raising the actuating compensation piston

lowering the speeder rod

582

The governor utilized with the device shown in the illustration has become inoperative while the vessel is underway at sea. Which of the following statements describes what action should be taken?

It is necessary to disconnect the shuttle valve from the throttle lever horizontal bar, in order to effectively jump out the pneumatic engine enable control circuit.

The governor should be replaced with one that has been proven to be useful in isochronous applications.

The engine speed can be controlled using the fuel control lever without changing the position of the maximum fuel stop.

The linkage to the shut down servomotor and the governor output shaft must be disconnected in order to operate the engine via the fuel control lever.

583

The governor, shown in the illustration, will have its preset speed droop altered whenever .

the speeder spring tension is changed

the speed droop lever fulcrum is changed

the compensating lever fulcrum is changed

all of the above

584

The high air velocity leaving the air impeller of an exhaust gas turbocharger is converted to pressure in the .

inlet nozzle ring

turbine wheel blading

diffuser passages

inlet volute

585

The highest loads applied to the diesel engine crankshaft main bearings are .

axial loads

firing loads

inertia loads

centripetal loads

586

The hunting of a diesel engine may be caused by .

excessive speed droop

insufficient speed droop

excessive sensitivity

low governor power

587

The impeller in area "A", shown in the illustration, is powered by .

air

exhaust gas

water

oil

588

The initial reaction of the governor floating lever to a decrease in load, shown in the illustration, is best described by which of the following statements.

The floating lever moves up at the speeder rod end.

The floating lever moves down at the speeder rod end.

The floating lever remains stationary.

The floating lever shifts to the left.

589

The intake air ducting to a diesel engine should not draw from an area on deck where flammable vapors released from tanks are present, because .

flammable vapors will accelerate corrosion of the turbocharger

the engine may overspeed and the normal governor or overspeed trip will not be able to secure the engine

the flammable vapors will result in an excessively rich mixture which will increase the brake horsepower output

all of the above

590

The intake ports of a two-stroke/cycle diesel engine are opened and closed by the action of the .

camshaft

piston movement

exhaust valves

vertical drive

591

The intake valves in a 4-stroke diesel engine are reseated by .

cam followers

push rods

combustion gases

valve springs

592

The leveling plates in a Kingsbury thrust bearing are held in position by .

lock wires

buttons or pivots

dowels and pins

pivoted segments

593

The lobes of a Roots-type blower are sometimes twisted into a spiral formed around the axes of rotation to .

decrease air losses around the lobes

decrease maintenance

allow for higher blower operating speeds

produce a more constant airflow

594

The magnetic lock between the armature and field in an electromagnetic coupling is established by .

controlled engine speed

energizing the field coils

brush contact with the armature

rotating the primary rotor

595

The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by .

dirt

fuel oil

governor cooling water

fuel oil tars

596

The manufacturer of a particular diesel engine recommends when running on heavy fuel for the vanadium content not to exceed 300 ppm. If there are 10 ounces of vanadium per 3125 pounds of fuel just taken on board, which of the following statements is correct?

The vanadium content is 2 ppm.

The vanadium content is slightly above acceptable values.

The vanadium content is well within recommended limits.

The vanadium content will accelerate cylinder wear.

597

The maximum allowable working pressure on a packaged auxiliary boiler is 200 psig. The normal working pressure for one particular packaged boiler is 175 psig. Which of the following safety relief valve settings would be proper for this boiler?

165 psig

195 psig

210 psig

220 psig

598

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust .

gas composition

gas temperature

pressure

timing

599

The method of scavenging used in the diesel engine, shown in the illustration, is known as .

uniflow scavenging

inertia scavenging

loop scavenging

central scavenging

600

The most common cause of scale formation in an auxiliary boiler is .

concentrations of calcium sulfate in the boiler water

fuel oil in the feed water

improper treatment of the feed water with calcium sulfate

excessive feed water alkalinity

601

The most common contaminate of governor hydraulic fluid is .

moisture

dirt

acid

air

602

The most common instrument used to measure diesel engine exhaust pressure is the .

pyrometer

bourdon gauge

pneumercator

manometer

603

The nuts of main bearings, connecting rod bolts and all other moving parts are to be secured by .

hardened steel nut locks

cotter pins made of spring steel

split pins or other effective means

hydraulic nuts as commonly found on large low speed engines

604

The opening of an exhaust valve on a modern, large, low- speed, main propulsion diesel engine, may be actuated by .

direct action of the overhead cam shaft

compressed air pressure

hydraulic "push rods"

direct action of the main piston moving down

605

The operating speed of a turbocharger is directly dependent upon .

engine speed

engine load

intake manifold pressure

atmospheric pressure

606

The overspeed trip device installed in some diesel engines is automatically actuated by .

spring force

hydraulic pressure

centrifugal force

mechanical linkage

607

The parts labeled 'I' and 'II', shown in the illustration are respectively identified as the .

exhaust valve and intake valve

intake valve and exhaust valve

fuel atomizer valve and exhaust valve

starting air valve and intake valve

608

The pinion gear shown in the illustration, is located .

below #1 and #3

between #1 and #3

between #2 and #4

below #2 and #4

609

The pneumatic circuit shown in the illustration is part of a complex control circuit for a large low speed diesel engine. How will the operation of the engine be affected if the line from the double check valve to the servo motor is severed?

The engine will continue to operate; however, restarting of the engine will be difficult.

The engine will automatically stop, although there will be no difficulty in restarting the engine.

The shutdown servo motor will develop a force overriding the output of the governor, causing in the fuel to the engine to be secured.

The safeguard provided by these devices will result in a temporary cessation of air flow through valve "D".

610

The pneumatic circuit shown in the illustration is part of a complex large low speed engine control system. Which of the following statements describes the function of this circuit?

The circuit shown is used to shift the cam shaft position when reversing the engine.

The piston labeled A provides a low pressure signal to the other components illustrated.

Valve D, when depressed, allows the retained pneumatic pressure within the shut-down servo motor to be relieved.

When oil pressure to valve C is diminished, a pressure decrease is developed at valve D, causing it to shift, and nullifying the actuating signal to device A.

611

The pneumatic circuit shown in the illustration is part of a control system used with large low speed diesel engines. The arrangement may be used to control .

bridge tachometer variations

the proportional offset of the throttle signal

main engine speed

emergency clutching operations

612

The polar timing diagram shown in the illustration is of a four stroke cycle, high speed diesel engine, with fuel injection timing commencing at 10 BTDC. Approximately how many degrees will the crankshaft rotate from the point at which fuel injection begins to the point where the exhaust valves begin to open?

55

95

135

235

613

The power consumed during the scavenging process of a diesel engine is known as the .

compression loss

valve loss

back pressure loss

pumping loss

614

The power developed by a large slow-speed main propulsion diesel engine is dependent upon the .

quantity of air it takes in and retains in the cylinders during a given time period

proportion of trapped air that is utilized in the combustion process

thermodynamic efficiency of the engine cycle

all of the above

615

The power developed by a large slow-speed main propulsion diesel engine is dependent upon the .

quantity of air and fuel available for combustion in the cylinder

mean effective pressure developed in the cylinder during the combustion process

thermodynamic efficiency of the engine cycle

all of the above

616

The power loss associated with slip in a fluid coupling appears as .

chattering in the driving member

heat in the hydraulic fluid

vibration in the driving member

leakage around the ring valve

617

The power output of a turbocharged diesel engine will drop if the cooling water flow through the after cooler is interrupted because the .

turbocharger stalls

exhaust pressure increases

air charge density decreases

scavenge effect increases

618

The pressure differential across a diesel engine lube oil system duplex filter should be checked to .

determine the need for filter cleaning

measure any change in oil viscosity

prevent excess pressure downstream

determine the need for batch filtration

619

The pressure differential across a diesel engine lube oil system duplex filter should be checked to .

determine the need for filter changing

measure any change in oil viscosity

monitor lube oil pump performance

determine the need for batch filtration

620

The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and .

controls the flow of feed water to the boiler

monitors the boiler high water level

secures the fires when a fusible plug burns out

automatically regulates the quantity of oil and air flow to the burner

621

The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent .

accidental dry firing and overpressure

uncontrolled fires in the furnace

explosions in the boiler furnace

overheating of the pressure parts

622

The PRIMARY function of a waste heat boiler is to .

reduce engine exhaust noise

reduce engine back pressure

recover heat which otherwise would be lost

increase turbocharger efficiency

623

The principal characteristic of an isochronous governor is it will .

slow the machine down as the load is increased

shut down the engine if it overspeeds

display excessive speed droop

maintain a constant speed with variations of load

624

The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the .

direction of air flow within the cylinder

sequence of port opening

method of opening exhaust ports

volume of air admitted to the cylinder

625

The principal purpose of refractory and insulation installed in the firebox of an auxiliary boiler is to .

prevent slag accumulation on the corbels

protect the inner casing and reduce heat loss

direct the force draft into the space between the inner and outer casings, to maintain a pressure seal

prevent flame impingement on the generating tube bank

626

The principal purpose of refractory and insulation installed in the firebox of an auxiliary boiler is to .

prevent flame impingement on the generating tube bank

direct the force draft into the space between the inner and outer casings, to maintain a pressure seal

protect the inner casing and reduce heat loss

prevent slag accumulation on the corbels

627

The procedures recommended for auxiliary boilers having high salinity include .

treating with oxygen scavengers

securing the boiler and giving it a bottom blow

increasing the pH

reducing the phosphate level

628

The process of scavenging a two-stroke/cycle diesel engine serves to .

improve fuel flow volume

cool the exhaust valves

reduce the intake air charge density

increase the temperature of exhaust gases

629

The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called .

engine displacement

super-aspirating

air injection

supercharging

630

The programmed control system of an automatic auxiliary boiler will terminate the light off process during the prepurge period if air flow is not sensed and .

the damper is not sufficiently open

the damper is not fully closed

oil pressure is not sensed

water pressure is not sensed

631

The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner .

in the event of a flame failure

in the event of a stack fire

when the water level reaches the crown sheet

when the feed pump discharge pressure drops to a preset minimum

632

The purpose of an after cooler is to .

reduce the turbocharger operating temperature

increase the pressure of the inlet air

increase the density of the inlet air

reduce the blower operating temperature

633

The purpose of an interference angle in a diesel engine exhaust valve is to . I. break up seat deposits II. work in conjunction with valve rotators to rotate the valve

I only

II only

both I and II

neither I nor II

634

The purpose of an interference angle in a diesel engine exhaust valve is to . I. seat the valve quickly II. break up seat deposits

I only

II only

both I and II

neither I nor II

635

The purpose of an interference angle in a diesel engine exhaust valve is to . I. work in conjunction with valve rotators to rotate the valve II. seat the valve quickly

I only

II only

both I and II

neither I nor II

636

The purpose of an interference angle in a diesel engine exhaust valve is to . I. work in conjunction with valve rotators to rotate the valve II. break up seat deposits

I only

II only

both I and II

neither I nor II

637

The purpose of designing some waste heat boilers with sinuous fire tubes, is to .

increase exhaust gas velocity through the boiler

reduce accumulations of carbon deposits on the heat transfer surfaces

eliminate exhaust gas pulsations and noise

increase the rate of heat transfer to the waterside

638

The purpose of the ball-head unit shown in the illustration of the governor is to .

transmit fly weight movement to the floating lever

rotate the fly weights at a speed proportional to engine speed

transmit speeder spring compression to the fly weights

transmit speeder rod motion to the rotating bushing

639

The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to .

compensate for low oil level

increase governor promptness

prevent governor hunting

limit engine load

640

The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to .

cool the furnace to prevent preignition

remove explosive vapors from the furnace

evaporate accumulated unburned fuel oil

provide sufficient air in the furnace to allow ignition of the fuel

641

The purpose of the rotating seal located at the aft end of the reversing reduction gear shown in the illustration, is to .

provide lube oil to the gears

attach a tachometer to indicate relative speed

provide operating air pressure to the clutch glands

prevent lube oil from leaking out of the gear case from the roller bearings

642

The purpose of the safety relief valves installed on an auxiliary boiler is to .

relieve excess fuel oil pressure during the 'off' fire cycle

admit water to the dry pipe

throttle the forced draft fan output for proper combustion

reduce excess steam pressure in the boiler

643

The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate .

dry steam from the steam and water mixture

condensate from feed water

superheated steam from saturated steam

sludge accumulations from feed water

644

The purpose of try-cocks used on an auxiliary boiler is to .

provide an alternate means of determining the water level, if the gage glass fails

provide a means of adding chemical feed to the boiler water

provide a means for blowing down the gage glass

act as a steam sentinel valve, if any of the fusible plugs should melt

645

The quantity of air delivered at any given speed by a Roots- type blower, as shown in the illustration, decreases as the pressure ratio increases. This is due to the .

decrease in clearance between the mating lobes

increase in air leakage past the rotors

decrease in air leakage past the rotors

increase in clearance between the mating lobes

646

The rate of heat transfer in a water-tube auxiliary boiler can be increased by .

operating the boiler at less than normal water level

installing fins on the firesides of water- tubes

increasing the amount of excess air to the burners

treating the boiler water with chemical oxygen scavengers

647

The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually .

greater than the average exhaust manifold pressure

less than the average exhaust manifold pressure

greater at the turbine wheel than at the impeller

greater at reduced engine speed

648

The required amount in the change of speed necessary before a governor will make a corrective movement is known as .

speed droop

sensitivity

stability

promptness

649

The RPM of "A" is 100 and has 80 teeth. If gears "B", "C", and "D" have 62, 20, and 38 teeth respectively, the RPM of "D" in the gear train illustration is .

67.91 RPM

652.63 RPM

505.79 RPM

52.63 RPM

650

The RPM of "A" is 100 and has 76 teeth. If gears "B", "C", and "D" have 60, 32, and 42 teeth respectively, the RPM of "D" in the gear train illustration is .

339.29 RPM

96.51 RPM

267.86 RPM

76.19 RPM

651

The RPM of "A" is 100 and has 88 teeth. If gears "B", "C", and "D" have 66, 22, and 48 teeth respectively, the RPM of "D" in the gear train illustration is .

61.11 RPM

412.50 RPM

550.00 RPM

45.83 RPM

652

The RPM of "A" is 100 and hobbed with 72 teeth. If gears "B", "C", and "D" have 64, 24, and 36 teeth respectively, the RPM of "D" in the gear train illustration is .

533.33 RPM

112.50 RPM

711.11 RPM

100.00 RPM

653

The RPM of "A" is 100 and hobbed with 76 teeth. If gears "B", "C", and "D" have 60, 32, and 42 teeth respectively, the RPM of "D" in the gear train illustration is .

339.29 RPM

96.51 RPM

267.86 RPM

76.19 RPM

654

The RPM of "A" is 100 and hobbed with 80 teeth. If gears "B", "C", and "D" have 62, 20, and 38 teeth respectively, the RPM of "D" in the gear train illustration is .

67.91 RPM

652.63 RPM

505.79 RPM

52.63 RPM

655

The RPM of "A" is 100 and hobbed with 88 teeth. If gears "B", "C", and "D" have 66, 22, and 48 teeth respectively, the RPM of "D" in the gear train illustration is .

61.11 RPM

412.50 RPM

550.00 RPM

45.83 RPM

656

The RPM of "A" is 100 and hobbed with 96 teeth. If gears "B", "C", and "D" have 80, 30, and 46 teeth respectively, the RPM of "D" in the gear train illustration is .

78.26 RPM

463.77 RPM

65.22 RPM

556.52 RPM

657

The RPM of "A" is 150 and hobbed with 78 teeth. If gears "B", "C", and "D" have 60, 32, and 42 teeth respectively, the RPM of "D" in the gear train illustration is .

148.57 RPM

522.32 RPM

401.79 RPM

114.29 RPM

658

The RPM of "A" is 150 and hobbed with 82 teeth. If gears "B", "C", and "D" have 62, 20, and 38 teeth respectively, the RPM of "D" in the gear train illustration is .

104.41 RPM

758.68 RPM

1003.42 RPM

78.95 RPM

659

The RPM of "A" is 150 and hobbed with 84 teeth. If gears "B", "C", and "D" have 64, 24, and 36 teeth respectively, the RPM of "D" in the gear train illustration is .

131.25 RPM

711.11 RPM

100.00 RPM

933.33 RPM

660

The RPM of "A" is 150 and hobbed with 86 teeth. If gears "B", "C", and "D" have 66, 22, and 48 teeth respectively, the RPM of "D" in the gear train illustration is .

806.25 RPM

89.58 RPM

618.75 RPM

68.75 RPM

661

The RPM of "A" is 150 and hobbed with 94 teeth. If gears "B", "C", and "D" have 80, 30, and 46 teeth respectively, the RPM of "D" in the gear train illustration is .

114.95 RPM

817.39 RPM

695.65 RPM

97.83 RPM

662

The RPM of "D" is 500 and hobbed with 36 teeth. If gears "A", "B", and "C" have 72, 64, and 24 teeth respectively, the RPM of "A" in the gear train illustration is .

93.75 RPM

70.31 RPM

444.44 RPM

62.50 RPM

663

The RPM of "D" is 500 and hobbed with 42 teeth. If gears "A", "B", and "C" have 42, 60, and 32 teeth respectively, the RPM of "A" in the gear train illustration is .

147.37 RPM

142.22 RPM

266.67 RPM

394.74 RPM

664

The RPM of "D" is 600 and has 46 teeth. If gears "A", "B", and "C" have 94, 80, and 30 teeth respectively, the RPM of "A" in the gear train illustration is .

84.38 RPM

110.11 RPM

510.64 RPM

71.81 RPM

665

The RPM of "D" is 600 and has 48 teeth. If gears "A", "B", and "C" have 84, 66, and 22 teeth respectively, the RPM of "A" in the gear train illustration is .

111.63 RPM

66.67 RPM

460.47 RPM

114.29 RPM

666

The RPM of "D" is 600 and hobbed with 46 teeth. If gears "A", "B", and "C" have 94, 80, and 30 teeth respectively, the RPM of "A" in the gear train illustration is .

84.38 RPM

110.11 RPM

510.64 RPM

71.81 RPM

667

The RPM of "D" is 600 and hobbed with 48 teeth. If gears "A", "B", and "C" have 84, 66, and 22 teeth respectively, the RPM of "A" in the gear train illustration is .

111.63 RPM

66.67 RPM

460.47 RPM

114.29 RPM

668

The RPM of "D" is 700 and hobbed with 38 teeth. If gears "A", "B", and "C" have 82, 62, and 20 teeth respectively, the RPM of "A" in the gear train illustration is .

72.84 RPM

529.27 RPM

104.64 RPM

55.07 RPM

669

The RPM of "D" is 800 and hobbed with 38 teeth. If gears "A", "B", and "C" have 80, 62, and 20 teeth respectively, the RPM of "A" in the gear train illustration is .

122.58 RPM

64.52 RPM

83.25 RPM

620.00 RPM

670

The RPM of "D" is 900 and hobbed with 36 teeth. If gears "A", "B", and "C" have 72, 64, and 24 teeth respectively, the RPM of "A" in the gear train illustration is .

168.75 RPM

112.50 RPM

100.00 RPM

800.00 RPM

671

The RPM of gear "D" is 900 and it is hobbed with 48 teeth. If gears "A", "B", and "C" have 88, 66, and 22 teeth respectively, the RPM of gear "A" in the gear train illustration is .

75.00 RPM

163.64 RPM

100.00 RPM

675.00 RPM

672

The safety valve installed on a coil-type auxiliary boiler is located on the .

thermostat tube

topmost coil

water tank

flash chamber

673

The satisfactory operation of diesel engine exhaust valves usually depends on .

the proper back pressure

the cooling water temperature

correct timing and proper seating

accurate metering and the exhaust temperature

674

The schematic diagram of an isochronous hydraulic governor is shown in the illustration. If there is an increase in applied load, the speed will decrease, and the .

flyweights (piece #8 and #9) move outward and the pilot valve (piece #10) moves upward

balance piston (piece #22) moves upward

proportioner piston (piece #25) moves downward

pilot valve (piece #10) moves downward

675

The section of the turbocharger which would be connected to the after cooler inlet is labeled .

B

C

H

K

676

The small clearances existing between each of the blower lobes, and between the lobes and casing of a Roots-type blower, must be maintained to .

provide for normal timing

prevent blower oil leakage

provide adequate blower lubrication

prevent abnormal air leakage

677

The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by .

a decrease in feed temperature

high furnace air pressure

high steam pressure

low steam pressure

678

The speed droop characteristics of two similar diesel engines, driving two similar AC generators, are connected in parallel. From the illustrated diagram, determine which of the following statements is true.

Engine "A" will take a greater part of the load than engine "B".

Engine "B" will operate at a lower RPM than engine "A" when operating alone.

Engine "A" will take lesser part of the load than Engine "B".

Engine "B" will operate at a higher RPM than engine "A".

679

The speed droop characteristics of two similar diesel engines, driving two similar DC generators, are connected in parallel. From the illustrated diagram, determine which of the following statements is true.

Engine "A" will take a greater part of the load than engine "B".

Engine "B" will operate at a lower RPM than engine "A" when operating alone.

Engine "A" will take lesser part of the load than Engine "B".

Engine "B" will operate at a higher RPM than engine "A".

680

The speed droop characteristics of two similar diesel engines, driving two similar DC generators, are connected in parallel. From the illustrated diagram, determine which of the following statements is true.

Engine "B" will take a greater part of the load than engine "A".

Engine "B" will operate at the same RPM as engine "A" when operating alone.

Engine "B" will take lesser part of the load than Engine "A".

Engine "B" will operate at a higher RPM than engine "A".

681

The speed of the turbocharger for a four-stroke/cycle diesel engine driving a generator at constant speed depends on the .

engine speed

kilowatt load

fuel injection pressure

air intake manifold temperature

682

The submerged electrode low water cutoff used in some automatically fired auxiliary boilers, will secure the burner fuel supply if the boiler water level .

touches the bottom of the electrode

drops below the electrode tip

changes from low to high level

remains constant and unvarying

683

The term 'diesel engine cylinder scavenging' means .

delivering more air into the cylinder than it would normally receive during an ordinary charging process

forcing the products of combustion out of the cylinder with the fresh air charge

collecting the air charge at the air cleaner

combustion and expansion of hot gas

684

The termination of fuel injection for a large low speed diesel engine is initiated by .

rotation of part #433

valve action of part #436

pressure applied to component #511

movement of rod #581

685

The torque transmitted by an electromagnetic induction coupling for an auxiliary diesel is dependent upon excitation and the .

engine speed

harmonic frequency

amount of slip

resonance

686

The total air capacity for non-reversible main engines is to be sufficient for .

six consecutive starts

eight consecutive starts

ten consecutive starts

twelve consecutive starts

687

The total starting air capacity required for reversible main engines is to be sufficient for a least .

six consecutive starts

eight consecutive starts

ten consecutive starts

twelve consecutive starts

688

The tube sheets installed in a fire-tube auxiliary boiler are normally connected by .

girder stays

fire-tubes and stay- tubes

external boiler plating

separate crown sheets

689

The turbocharger diffuser ring of the compressor element shown in the illustration, is indicated by the part labeled .

"D"

"E"

"F"

"G"

690

The upper leveling plates in a Kingsbury thrust bearing are held in place by .

pins through the base ring

buttons on the thrust shoes

pivots on the thrust collar

screw dowels in the base ring

691

The valve bridge, illustrated, allows for .

two exhaust valves to be operated from one rocker arm

the exhaust valves to be lubricated through an internal lube oil passage

positive closing action of the exhaust valves

positive rotation of the exhaust valves

692

The valve gear shown in the illustration is for a four- stroke/cycle, medium speed, diesel engine, with fuel injection commencing in at 10 Before TDC. Approximately how many crankshaft degrees from the point at which fuel injection begins, does the exhaust valve push rod begin to move up?

90

90-120

130-160

180-190

693

The valve spring shown in the illustration, functions to .

prevent movement of the bushings

hold the valve against its seat

position the bushing to the cam

open the valve at the proper time

694

The valve stem expansion associated with engine warm-up is allowed for by the .

valve springs

hydraulic governor

valve lash adjusters

cooling system

695

The variation in the amount of fuel oil burned in the operation of an auxiliary boiler, utilizing a return flow type atomization system, is a function of the .

fuel oil recirculating valve

fuel oil back pressure

fuel supply pressure regulating valve

automatic steam atomizer assembly

696

The volume of available air supply required by an air clutch varies with the .

size of the clutch

volume of the supply line between the control valve and the clutch

frequency of engagement

all of the above

697

The water in a steaming auxiliary boiler should be tested daily for .

dissolved oxygen

chlorides

sludge

dissolved nitrogen

698

The water in an auxiliary boiler should be chemically tested daily for alkalinity and .

soap hardness

nitrogen content

chloride content

dissolved CO2

699

The water in an auxiliary boiler should be tested for chloride content to determine .

total dissolved solids

salt contamination

water hardness

chlorine contamination

700

The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each .

hour

day

week

month

701

Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the .

cooling water leaving each cylinder

fuel oil entering the injector

exhaust gases at various locations

lube oil at the bearing supplies

702

Throttling a burner air register on an auxiliary boiler could result in .

smoky boiler operation

decreased fuel consumption

improved fuel combustion

fewer soot deposits

703

To check the setting of the overspeed trip on a diesel powered generator, you would use a .

tachometer

torsion meter

dynamometer

pony brake

704

To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should .

increase the governor oil pressure

adjust the speed droop setting

adjust the speeder spring travel

adjust the compensating needle valve

705

To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the .

lube oil temperature at the cooler outlet

lube oil strainer magnets

bearing lube oil temperature

lube oil pressure to the bearing

706

To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the .

lube oil pressure to the bearing

lube oil strainer magnets

lube oil temperature leaving the bearing

lube oil temperature at the cooler outlet

707

To increase the speed setting of the governor shown in the illustration, which of the listed adjustments must be made?

Increase the compression of the speeder spring.

Open the compensating needle valve.

Increase the load limit adjustment.

Compress the compensating dashpot spring.

708

To prevent vibration damage to the fuel supply line of a diesel engine, you may use .

a short length of heavy duty clear plastic tubing

a length of approved flexible nonmetallic hose

welded flange connections for all joints

aluminum piping with expansion loops

709

To stop the diesel engine governor from hunting, the governor oil system is to be purged of trapped air by adjusting the part shown in the illustration labeled .

A

B

C

D

710

To successfully reduce an excessively high diesel engine exhaust gas temperature, you should .

reduce the engine driven fuel pump outlet pressure

retard the fuel injector timing to reduce power

increase the fuel rack setting

reduce the load on the engine

711

To test the operation of the flame failure switch of an operating automatically fired auxiliary boiler, you should .

de-energize the high voltage ignition system

move the igniter away from the normal firing position

close the manual fuel valve with the burner firing

shift the controls to low fire

712

Torque capacity of the air clutch shown in the illustration, may be increased by .

putting in a thinner friction plate #6

increasing air pressure

removing clutch spring #4

adjustment of nut #22

713

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for .

improving cylinder scavenging

preheating the combustion chamber

reducing air charge density

preventing valve wear

714

Two air compressors are provided for the starting air system and should be capable of .

charging the starting air containers within one hour

providing the minimum quantity of starting air at all times

supplying all the air necessary to start both the main engine and an auxiliary at the same time

topping off all receivers at the required design pressures

715

Two inflatable clutch glands are provided in the main engine reduction gear illustrated because .

this is a two-speed gear

additional clutch friction is required at high speeds

one is a spare in the event of failure of the primary gland

the reduction gear is able to provide a reverse output

716

Two solenoid control valves are required on large automatic auxiliary boilers, and will simultaneously shut off the fuel in the event of .

low water

low steam pressure

high voltage

all of the above

717

Under which of the following conditions must the combustion control system for a small automatic auxiliary boiler secure the burner?

High water level

Low steam pressure

Flame failure

High fuel oil temperature

718

Valve rotators are commonly used on which of the listed diesel engine cylinder head valves?

Air starting

Cylinder relief

Exhaust

Blow down

719

Valves and fittings used with diesel engine fuel oil pressure piping may be threaded in sizes up to and including 60 mm O.D., but screwed unions .

are to be used on pressure lines in sizes 33 mm O.D. and over

over 33 mm O.D. will be permitted in lieu of flanged connections

shall not be used in any instance where the fitting is subjected to excessive vibration

are not to be used on pressure lines in sizes 33 mm O.D. and over

720

Valves in the cylinder head of a diesel engine are opened by the direct action of the .

exhaust pressure

valve spring pressure

rocker arm movement

wrist pin movement

721

Valves used in diesel engine fuel oil pressure piping are to be .

so constructed as to permit packing under pressure

solenoid released upon the failure of engine lubrication

either of the gate or globe valve type

forge constructed under the approval of the Marine Inspector

722

Variations in the amount of fuel oil burned in a return flow type burner of an auxiliary boiler, are controlled by the .

atomizing steam pressure

size of the whirling chamber

back pressure in the fuel oil return line

area of the tangential slots

723

Vessels having main engines arranged for air starting are to be provided with at least .

one automatic drain serving both containers

two air starting containers of approximately equal size

one control air container and one starting air container

one additional means of starting the main engine

724

Waste heat boilers may be equipped with vents on the feed water heater heads to .

prevent air binding

release excess pressure

allow for feed water treatment

remove sediment

725

Waterside scale in a fire-tube boiler may cause .

increased heat transfer

fireside erosion

high steam demand

overheated tubes

726

Wear occurring at the tips of the reduction gear teeth is usually the result of .

surface fatigue

fretting corrosion

heavy overloading

gear misalignment

727

Wet-type exhaust silencers, 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.

728

What changes in valve timing will tend to increase the cooling effect on the exhaust valve in a four-stroke cycle turbocharged diesel engine?

Retard the intake valve opening and advance the exhaust valve closing period.

Advance the intake and exhaust valve opening period.

Advance the intake valve opening and retard the exhaust valve closing periods.

Retard the intake and exhaust valve closing period.

729

What color exhaust will be exhibited when a slow speed two- stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?

White

Black

Blue

Clear

730

What component would normally be installed at location "D" , as shown in the illustration ?

Boiler water level indicator

Oil fired mechanical burner

Boiler soot blower unit

Flue gas smoke density indicator

731

What condition listed below would indicate that a pump overhaul was necessary for a centrifugal saltwater service pump.

Indicated head pressure does not change when the discharge valve is closed

Pump vibration has increased

Shaft packing gland requires constant repacking due to an excessively worn sleeve

All of the above

732

What condition listed below would specifically indicate that a pump overhaul was necessary for a centrifugal saltwater service pump.

Indicated head pressure does not change when discharge valve is closed.

Observed operational speed has decreased

Excessive noise coming from drive motor

Excessive noise coming from pump coupling

733

What condition listed below would specifically indicate that a pump overhaul was necessary for a centrifugal saltwater service pump.

Pump coupling requires constant maintenance.

Observed operational speed has decreased.

Indicated head pressure does not change when discharge valve is closed.

Salt water heat exchangers running hot.

734

What device is installed and used as a safety feature to satisfy Coast Guard regulations for the unit shown in the illustration?

Spring clutch

Overrunning clutch

Pneumatic three position valve

Electrical limit switch

735

What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?

Increased carbon buildup.

Burning of intake valves.

Excessive firing pressures.

Increased fuel consumption.

736

What indications would you use to determine that a pump overhaul was necessary for a salt water service centrifugal pump assuming normal salt water supply conditions?

Shutoff head pressure had dropped by 20%

Noticeable decrease in operational speed

Pump coupling requires constant maintenance

All of the above

737

What is required for crosshead type engines that have a scavenging space in open connection to the cylinder?

The air flow from the scavenging space must always be protected by plate type check valves and under no circumstance may other devices be used.

A suitable gasket for the interface of both manifolds is necessary to prevent recirculation of scavenging gases, while additionally minimizing exhaust gas leakage.

The scavenging space is to be permanently connected to an approved fire extinguishing system, entirely separate from the fire extinguishing system of the engine room.

The required equipment for a crosshead type engine is totally dependent upon manufacturers ability to placate market demands.

738

What is the best way of stopping an overspeeding 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

739

What is the function of the after coolers installed in the diesel engine air intake system?

Decrease the air density

Increase the exhaust temperature

Decrease the lube oil temperature

Increase the air density

740

What is the function of the main thrust bearing?

Prevents lateral movement of the slow speed gear.

Transmits propeller thrust to the hull.

Keeps spring bearings in line.

Prevents main reduction gear axial movement.

741

What is the primary purpose of the pneumatic component shown in the illustration?

The valve with finite positioning is used to segregate terminal signals originated by the governor whenever the throttle is repositioned.

The indicated valve prevents transmission of transient signals to the governor speeder spring.

If the locking handle is in any position other than 'zero', the output of the pneumatic valve will equal the input.

If the throttle is manually moved from its 'zero' position, the resulting effect will tend to override the output of the governor, and secure the air to the control circuit.

742

What is to be installed on an internal combustion engine if its cylinder bore exceeds eight inches?

Crankcase vapor monitors

Engine exhaust silencers

Constant pressure type turbochargers

Explosion relief valves

743

What may be used to protect starting air mains against explosions arising from improperly functioning starting valves?

The starting air main shall be protected by the use of a rupture disc.

No protection is necessary because all starting air valves are designed similar to check valves.

An isolation non-return valve is to be installed at the starting air supply connection to each engine.

The materials used in the construction of the starting air mains will contain any explosion.

744

What method is used to supply air to the cylinders of the diesel engine illustrated?

Operation of the turbocharger at full load

Operation of an auxiliary blower at low load

The pumping action of the piston

All of the above are correct.

745

What method is used to supply air to the cylinders of the diesel engine shown in the illustration?

By the action of the turbocharger at full load.

By the action of an auxiliary electric blower at low load.

By the pumping action of the piston.

All of the above.

746

What type of fitting is to be used on diesel engine fuel injection line piping?

Mild steel

Hardened steel

Extra heavy

Double extra heavy

747

What type of reduction gear would most commonly be used with twin medium-speed propulsion diesel engines driving a single shaft?

Single reduction, planetary

Single reduction, single input

Single reduction, double input

Double reduction, double input, articulated

748

What will cause valve stem blow-by to the valve section shown in the illustration?

A cracked lower spring plate.

Worn, broken or stuck compression rings.

Damaged rubber rings on the valve seat insert.

Defective rubber seal rings in the valve guides.

749

What would be the approximate gap clearance value for a flywheel magnetic pickup speed sensor as found on most medium and high speed engines?

.001 " - .003 "

.022 " - .033 "

.222 " - .333 "

.333 " - .666 "

750

What would cause a coil type evaporator to require consistently higher steam coil pressure to maintain its output capacity?

The brine density is improper.

Heat transfer surfaces are being layered with scale.

Impure distillate is being produced.

Shell vapor pressure is constantly decreasing.

751

When a diesel engine is attached to a reduction gear, diesel engine speed is reduced and the torque available for work .

remains the same

is reduced

is increased

is eliminated

752

When a diesel engine is equipped with a hydraulic starting system designed to operate at pressures of 150 psi or more, Coast Guard Regulations (46 CFR) require that the hydraulic fluid shall .

have a viscosity index number greater than 100

have a flash point of not greater than 200F

have a flash point of not less than 315F

be oxidation resistant and nontoxic

753

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

754

When a hydraulic valve lifter is on the base circle of the cam, 'zero' valve lash is maintained by the .

valve spring

plunger spring

oil pressure

rocker arm

755

When a naturally aspirated four-stroke/cycle diesel engine is converted for supercharging, which of the following changes must be made to the valve timing?

The intake valve opening is advanced and the exhaust valve closing is retarded.

The intake valve opening is unchanged and the exhaust valve closing is advanced.

The intake valve opening is retarded and the exhaust valve closing is advanced.

The intake valve closing is retarded and the exhaust valve closing is advanced.

756

When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used .

at high loads to prevent overheating

at low loads to prevent corrosion in the boiler

during periods of high steam demand

when the turbocharger is in operation

757

When accumulated carbon at the air inlet ports of a two- stroke/cycle diesel engine is being removed, you should take care to avoid carbon .

entering the cylinder

particles becoming lodged under the intake valves

entering the water jacket

particles entering lube oil

758

When air is delivered under pressure to one of the glands of an air-bladder clutch, the .

inside diameter of the clutch gland increases

inside diameter of the clutch gland decreases

gland rotates out of contact with the drums

clutch begins to rotate with the engine

759

When an additional load is applied to a diesel engine which is using an air bladder clutch unit that is inadequately inflated, you can expect .

chipped reduction gear teeth

overheating because of slipping shoes

pneumatic seizure

excessive wear on the thrust bearings

760

When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect .

pneumatic seizure

overheating because of slipping shoes

chipped reduction gear teeth

excessive wear on the thrust bearings

761

When an auxiliary boiler is on the line, the output of the flame scanner can be checked by placing a microammeter in series with the photoelectric cell circuit. The readings on high fire should be .

higher than those at low fire

equal to those at low fire

lower than those at low fire

lower than those at low fire, but the generated voltage will be higher

762

When an auxiliary boiler is panting and emitting black smoke, you should .

increase the fuel oil temperature

decrease the fuel oil temperature

decrease the fuel oil supply pressure

increase the air supply

763

When an auxiliary boiler is secured and you expect to relight the unit within six hours, you should .

maintain a head of steam not less than 10 psig

completely fill the boiler with feed water

flush the boiler and close the waterside airtight

maintain steam pressure 10 psig below normal boiler load

764

When attempting to start a main propulsion diesel engine, the engine turns at the proper speed but will not start. You should check the .

starting air pressure

scavenge air pressure

overspeed trip

banjo oiler line

765

When changing the direction of propeller shaft rotation in a diesel plant equipped with a pneumatic clutch, you must pause at neutral to allow the .

fuel rack to readjust

engine to slow down

propeller to stop

clutch to deflate

766

When checking for the presence of sulfite in the feed water of an auxiliary boiler, you are in essence checking .

the hardness of the makeup feed water

to ensure the compound additions are adequate for control of pH

to ensure the compound additions are adequate for controlling dissolved oxygen

to ensure the automatic or manual blow down rate and frequency is adequate for control of total dissolved solids

767

When checking the underside of the valve cover shown in the illustration, you find localized black patches. You should suspect .

worn valve locks

loose tapered collars

a damaged inner valve spring

worn exhaust valve guides and seals

768

When conducting a hydrostatic test on a water-tube auxiliary boiler, the test water should be heated to a temperature of at least 70F (21C). This is done to .

maximize the coefficient of expansion within the varying types of metals used in boiler construction

help prevent the formation of condensation on the tube exteriors

eliminate refractory thermal stress

all of the above

769

When conducting a hydrostatic test on a water-tube auxiliary boiler, the test water should be heated to a temperature of at least 70F. This is done to .

minimize the coefficient of expansion within the varying types of metals used in boiler construction

help prevent the formation of condensation on the tube exteriors

eliminate oxygen being carried into the system

all of the above

770

When fuel oil heaters are required for main engine operation, .

each heater shall have the capacity to supply the main engine at full power

at least two heaters of approximately equal size are to be installed

the system shall be designed to permit series or parallel operation

none of the above

771

When inspecting the valve mechanism shown in the illustration, normal maintenance would include .

mechanically adjusting the valve at point "D"

mechanically adjusting the valve at point "E"

changing the tappet clearance as measured between points "A" and "B"

measuring the cold valve clearance between components "C" and "D"

772

When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?

Cold fuel oil

Low fuel oil pressure

Low atomizing steam pressure

Water in the fuel oil

773

When may the crankcase ventilation pipes or oil drain pipes of two or more engines be connected?

Propulsion engines under 1000 shaft horsepower may share a common crankcase vent provided the oil drains remain separate.

In most cases it is desirable and cost effective for propulsion engines to share a common crankcase ventilation and monitoring system.

No interconnection may be made between the crankcase ventilation pipes or oil drain pipes.

None of the above are correct.

774

When monitoring diesel engine performance, the most useful instrument to use is the .

dwell-tachometer

exhaust gas pyrometer

fuel flow rate meter

exhaust gas analyzer

775

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually .

single reduction

double reduction

triple reduction

quadruple reduction

776

When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will be indicated?

Advanced ignition

Clogged air intake

Leaky exhaust valve

High exhaust pressure

777

When passing through mesh contact, the teeth of a reduction gear first go through a series of actions best described as .

galling

squeezing

sliding

slipping

778

When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil .

directly to the fuel oil heater inlet for further warm-up

back to the fuel oil settler for further filtration

back to the suction side of the service pump

directly to the deep tanks

779

When removing carbon that has accumulated at the air inlet ports of a two-stroke/cycle diesel engine, you should take precautions to prevent carbon particles from .

entering the lube oil

entering the cylinder

entering the water jacket

becoming lodged under the intake valves

780

When replacing tubes in a water-tube auxiliary boiler, to eliminate the possibility of leaks at the tube seats, the replacement tubes should be .

stress relieved to ensure expansion when rolled

annealed to prevent cracking when rolled

fitted with a welded backing ring in the seat area

rolled, beaded, and seal welded around the bead edge

781

When the cold tappet clearance is less than that specified by the engine manufacturer, the diesel engine valves will .

open earlier than normal

close earlier than normal

remain open for a shorter duration

fail to open when the valves are warm

782

When the cold valve lash is less than that specified by the manufacturer, diesel engine valves, operating at normal temperatures, will .

open later than normal

close later than normal

have less total lift

have less total duration

783

When the diesel engine hydraulic governor shown in the illustration is operating at controlled speed, which of the relationships listed will occur between the edges of the pilot valve and the ports of the pilot valve bushings?

The edges register with and just close off the ports without allowing oil flow.

The edges are above the ports and oil under pressure supplies the power piston.

The edges are above the ports and oil bleeds to the sump.

The edges are in constant motion going both above and below the ports and governor stability is maintained.

784

When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will .

lag behind the increased fuel supplied to the engine

enter the engine along with the increase in fuel

enter the engine before the increased fuel supply

leave the turbocharger as a negative pulse

785

When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .

pick up more of any increase in load

pick up less of any increase in load

share an equal amount of any increase in load

drop an equal amount of any decrease in load

786

When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will .

increase the fuel oil control valve opening

increase the rotary cup speed

decrease the back pressure regulating valve opening

decrease the supply steam control valve opening

787

When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by .

renewing the drive gear

renewing the driven gear

renewing both driving and driven gears as a set

shimming and pinning the gears with proper backlash

788

When there is a flame failure in an automatically fired auxiliary boiler, the .

air supply is shut off

fuel supply is shut off

water supply is shut off

safety valve lifts

789

When two direct air start reversible medium speed diesel engines are coupled in parallel to a common propeller shaft, which of the operating conditions listed will apply during extended periods of maneuvering?

Full horsepower is available ahead and astern.

Mechanical reduction gearing is not required.

Full reversing torque is available.

One engine will be turning ahead and the other astern with the appropriate engine clutched in and out to answer bells.

790

When two medium speed diesel engines are electrically coupled in parallel to a common propeller shaft which will operate at a speed less than 100 RPM, which of the operating conditions listed will apply?

Propeller shock loads can severely damage the clutch.

One engine must be running ahead and the other astern.

Full reversing torque is not available.

Mechanical reduction gearing is required.

791

When used in conjunction with a turbocharger, the main function of an after cooler is to .

increase the density of the cylinder air charge

prevent turbocharger overheating

eliminate the need for a precooler

remove moisture from air compressed by the turbocharger

792

When used with reversing reduction gears, main propulsion diesel engines should be bolted tight to their foundations with fitted bolts at the output drive end and snug bolts with elongated bolt holes at the opposite end. This is done to .

maintain alignment when the ship's hull is working in heavy seas

ensure engine vibrations correspond to the natural frequency of the hull

permit thermal expansion of the engine frame away from the driven equipment as the engine reaches operating temperature

maintain proper engine thrust bearing clearances

793

When would a diesel engine exhaust valve spring be under the greatest compression load?

when the valve is seated

when the valve is partially closed

when the valve is partially open

when the valve is fully open

794

When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?

During operation at low load and speed

During operation at rated speed, but low power output

During acceleration

All of the above

795

When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine driving a turbocharger, result in a low value of scavenging air pressure for combustion?

During operation at low load and speed

During operation at rated speed, but low power output

During acceleration

All of the above

796

Where engine bores exceed 230 mm, a bursting disc or flame arrester is to be fitted .

at the supply inlet to the control air manifold for non- reversing engines

on the exhaust manifold prior to the inlet of the turbochargers

on all devices subject to the by-products of combustion or lubrication system vapors

in way of the starting valve of each cylinder for direct reversing engines having a main starting manifold

797

Where engine bores exceed 230 mm, a bursting disc or flame arrestor is fitted .

at the supply inlet to the starting air manifold for non- reversing engines

on the exhaust manifold prior to the inlet of the turbocharger

on all devices subject to the by-products of combustion or lubrication system vapors

in way of the control valve of each cylinder for direct reversing engines having a main starting manifold

798

Where is a fusible plug installed on a Scotch or auxiliary boiler?

At the shell approximately 1 1/2 inches (3.8 cm) below the normal waterline.

At or near the center of the crown sheet of the combustion chamber.

In the furnace approximately 1 1/2 inches (3.8 cm) below the normal waterline.

In the furnace not more than 1 inch (2.54 cm) below the lowest permissible water level.

799

Where one or more diesel driven AC generators are operating in parallel, reducing the value of the speed droop to 'zero' on one unit will allow that unit to .

gradually reduce its speed as load is applied

change load without changing speed

automatically divide and balance the loads

effectively anticipate the amount of fuel necessary to bring the engine up to the proper output to accept the increased load

800

Where the size and design of an engine is such that lubrication before starting is not necessary and an attached pump is normally used, .

an additional pump is not required provided the engine driven pump is capable of producing sufficient pressure regardless of the direction of rotation

no additional pumps are required if the vessel is equipped with two propulsion engines clutched to reduction gears through a suitable arrangement

an independently driven pump capable of supplying each engine with sufficient quantities of oil during ahead operations is required

an independently driven stand-by pump is not required if a complete duplicate of the attached pump is carried as a spare

801

Which action should be taken when an auxiliary boiler is in operation?

Clean all electrical connections.

Lift the relief valves by hand.

Inspect and clean all solenoid valves.

Inspect for oil and water leaks.

802

Which condition indicates the air side fouling of an after cooler on a turbocharged diesel engine?

An increased air temperature differential between the cooler inlet and outlet.

A decrease in the air pressure differential across the cooler.

Excessive condensate forming in the air box.

A decrease in the air temperature differential between the cooler inlet and outlet.

803

Which direction of rotation of the gear pump shown in the illustration will produce the correct direction of oil discharge to operate the governor? I. clockwise II. Counterclockwise

I only

II only

Both I and II

Neither I nor II

804

Which letter represents the scavenging air system non- return valve in the illustration?

P

Q

W

U

805

Which of the air intake systems listed will require the least amount of brake horsepower to operate?

Natural aspiration

Turbocharged

Roots blower

Underside piston compression

806

Which of the air intake systems listed will result in the lowest specific fuel consumption?

Natural aspiration

Turbocharged

Roots blower

Piston blower

807

Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?

Automatic bottom blow valve

Low water level cutoff switch

Voltage output of the ignition transformer

Insulation resistance readings in the ignition system high tension leads

808

Which of the bearing types listed is most commonly used for their ability to absorb thrust in reduction gear applications?

Ball bearings

Poured bearings

Sleeved bearings

Tapered roller bearings

809

Which of the changes in the valve timing listed should be carried out when a naturally aspirated four-stroke/cycle diesel engine is converted to a supercharged engine?

Retard the intake valve opening and advance the exhaust valve closing period.

Advance the intake and exhaust valve opening period.

Advance the intake valve opening and retard the exhaust valve closing periods.

Retard the intake and exhaust valve closing period.

810

Which of the clutch types listed is shown in the illustration of the reversing reduction gear unit? (See illustration MO- 0085)

Hydraulic coupling

Electromagnetic coupling

Air operated friction clutch

Synchromesh coupling

811

Which of the conditions listed will occur as a result of having an intercooler installed in the diesel engine intake system shown in the illustration?

Intake valve burning is eliminated.

Air charge density will be increased.

Brake specific fuel consumption will be increased.

Cylinder combustion temperatures will be lowered.

812

Which of the coupling types listed is shown in the illustration?

Solid flange

Hydraulic flexible

Pneudraulic flexible

Fluid drive

813

Which of the couplings listed is normally not repairable, and is usually replaced if completely damaged?

Flexible disk-ring coupling

Gear-type coupling

Grid spring coupling

Block and jaw coupling

814

Which of the couplings listed will prevent shock loads from being transmitted to an engine?

Grid

Dog type

Friction

Hydraulic

815

Which of the designs listed will keep the lobes from making contact in a Roots-type blower?

Drive chain

Blower timing gears

Air trapped between blower lobes

Oil filter between blower lobes

816

Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency?

Impeller

Compressor

After cooler

Exhaust diffuser

817

Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?

A wet-type exhaust muffler

A constant pressure muffler

A dry-type exhaust muffler

A constant velocity muffler

818

Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?

Intake manifold

Water-cooled exhaust system

After cooler

Exhaust diffuser

819

Which of the equal horsepower diesel engines listed, running at the same speed, is least affected by exhaust back pressure?

A four-stroke/cycle "V" type engine

A two-stroke/cycle "V" type engine

An in-line two- stroke/cycle engine

An opposed piston engine

820

Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?

Vent air from the steam drum

Observe general boiler performance

Lift the safety valves by hand

Inspect and clean burner oil solenoid valves

821

Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?

Test boiler water alkalinity

Inspect and clean burner fuel oil solenoid valves

Lift the safety valves by hand

Blow down the water gage glass

822

Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?

Clean the flame scanner photocell window.

Inspect and clean all solenoid valves.

Lift the safety valves by hand.

Inspect for oil or water leaks.

823

Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?

A temperature sensing device opens the circuit breaker in the burner motor.

The high limit control secures power to the entire oil firing system.

The stack relay actuates the low limit control which breaks the ignition circuit.

The stack relay secures power to the high voltage side of the ignition transformer.

824

Which of the following adjustments is always required whenever the diesel engine governor oil has been drained and renewed?

Speed droop

Compensation

Idle speed setting

Load limit control

825

Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?

Increased cylinder air turbulence

Increased maximum horsepower

Increased cylinder mean effective pressure

All of the above.

826

Which of the following characteristics is true relative to meshing spur gears?

The gear of larger diameter will rotate at a slower RPM.

Both gears will operate in the same direction.

The teeth on the larger gear are larger than the teeth on the smaller gear.

The teeth on the larger gear are smaller than the teeth on the smaller gear.

827

Which of the following components may be installed at location "B", as shown in the illustration?

Boiler water level indicator

Oil fired mechanical burner

Boiler soot blower unit

Flue gas pyrometer

828

Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four- stroke/cycle, turbocharged, diesel engine?

Unbalanced cylinder loading

Excessive piston blow- by

A dirty after cooler

Early injection timing

829

Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?

Excessive piston blow- by to the manifold.

Insufficient cooling water flow.

Accumulated water in the air boxes.

Clogged air intake filters.

830

Which of the following conditions could cause black smoke to be discharged from the stack of an auxiliary boiler equipped with turbine-driven rotary cup atomizers?

Insufficient steam supply to the fuel oil heater.

Excessive opening of the dampers in the combustion air inlet.

Improper turbine shaft speed in the atomizer assembly.

Low fuel oil viscosity being maintained.

831

Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?

Increased suction head pressure

Decreased feed water temperature

Pump recirculating line being open too much

Excessive feed water temperature

832

Which of the following conditions is indicated by the presence of water in the scavenging air receiver?

Leaking cylinder head gaskets

Leaking after cooler

Excessively high scavenge air temperature

Auxiliary blower failure

833

Which of the following conditions is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?

Indicated exhaust pressure readings will increase.

Pyrometer responses will be retarded.

Indicated cylinder temperature readings will increase.

Indicated firing pressure readings will increase.

834

Which of the following conditions is realized by the turbo charging of a previously naturally aspirated diesel engine?

Ignition lag increases.

Lube oil system pressure increases.

Brake specific fuel consumption increases.

Mechanical efficiency increases.

835

Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in an auxiliary boiler?

Expansion of the steam in the furnace.

Expansion of the steam in the whirling chamber.

Expansion of the steam in the orifice plate.

All of the above.

836

Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?

Decreasing scavenge air pressure.

Increasing exhaust temperatures before the turbine.

Reduction in engine speed.

All of the above

837

Which of the following conditions may cause an engine to overspeed on initial startup?

Faulty injectors

Turbocharger seal ring failure

Airborne hydrocarbons in surrounding area

All of the above

838

Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?

Poor combustion

High cylinder oil consumption