|
A |
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 |
|
A |
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 |
|
C |
The gage glass
on a coil-type auxiliary boiler is connected to the __________. |
heating coil inlet
and outlet |
surge chamber |
accumulator |
water softener |
|
A |
Which of the following
statements concerning fire-tube boilers is correct? |
Combustion gases
flow through the tubes. |
Flames impinge
on the tubes. |
Combustion occurs
in the tubes. |
Water flows through
the tubes. |
|
D |
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 |
|
B |
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 |
|
B |
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 |
|
A |
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 |
|
A |
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 |
|
A |
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 |
|
B |
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 |
|
B |
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 |
|
A |
Which of the following
statements concerning fire-tube boilers is correct? |
Combustion gases
flow through the tubes. |
Flames impinge
on the tubes. |
Combustion occurs
in the tubes. |
Water flows through
the tubes. |
|
D |
The boiler shown
in the illustration would be classed as __________. Illustration MO-0064 |
forced circulation,
coil-type |
two-pass, scotch
marine |
two-pass, water-tube |
single-pass, fire-tube,
scotch marine |
|
A |
Which of the listed
problems will happen when the water level of a fire-tube type auxiliary
boiler approaches the crown sheet? |
The fusible plugs
will melt. |
The furnace will
explode. |
Excess steam will
be generated. |
The furnace will
overheat. |
|
B |
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 |
|
D |
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 |
|
C |
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 |
|
A |
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 |
|
A |
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 |
|
B |
Which of the listed
sequence of events occurs when an automatic auxiliary boiler is prepurged? |
The damper on
the inlet side of the furnace is moved to the open position for a given
number of seconds and then moved to the closed position. |
The damper on
the inlet side of the furnace is moved to the open position for a given
number of seconds and then moved to the low fire position. |
The damper is
moved to the closed position for a given number of seconds and then moved
to the low fire position. |
The damper in
the uptakes is moved to the wide open position for a given number of seconds
and then moved to the low firing rate position. |
|
D |
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 |
|
B |
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. |
|
C |
Which of the following
statements describes how the fuel oil enters the whirling chambers of the
sprayer plates used in an auxiliary boiler return flow fuel oil system? |
Through the outer
barrel tube. |
Through the sprayer
plate drilled passages. |
Through tangential
slots in the sprayer plate. |
Through baffles
in the orifice plate. |
|
C |
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 |
|
B |
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 |
|
A |
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 |
|
B |
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 |
|
C |
Why should the
main steam stop valve of an auxiliary boiler be eased off its seat and then
gently closed before lighting off? |
To examine the
valve stem for scars or nicks. |
To check for a
tight bonnet seal. |
To ensure that
the valve will not be seized shut when hot. |
To check the valve
packing. |
|
C |
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 |
|
B |
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 |
|
A |
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 |
|
C |
The gage glass
on a coil-type auxiliary boiler is connected to the __________. |
heating coil inlet
and outlet |
surge chamber |
accumulator |
water softener |
|
D |
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 |
|
B |
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 |
|
A |
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 |
|
B |
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 |
|
B |
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 |
|
A |
Which of the following
statements concerning fire-tube boilers is correct? |
Combustion gases
flow through the tubes. |
Flames impinge
on the tubes. |
Combustion occurs
in the tubes. |
Water flows through
the tubes. |
|
C |
The boiler shown
in the illustration would be classed as __________. Illustration MO-0064 |
two-pass, water-tube |
two-pass, scotch
marine |
single-pass, fire-tube,
scotch marine |
forced circulation,
coil-type |
|
A |
Which of the listed
problems will happen when the water level of a fire-tube type auxiliary
boiler approaches the crown sheet? |
The fusible plugs
will melt. |
The furnace will
explode. |
Excess steam will
be generated. |
The furnace will
overheat. |
|
B |
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 |
|
D |
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 |
|
C |
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 |
|
A |
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 |
|
A |
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 |
|
B |
Which of the listed
sequence of events occurs when an automatic auxiliary boiler is prepurged? |
The damper on
the inlet side of the furnace is moved to the open position for a given
number of seconds and then moved to the closed position. |
The damper on
the inlet side of the furnace is moved to the open position for a given
number of seconds and then moved to the low fire position. |
The damper is
moved to the closed position for a given number of seconds and then moved
to the low fire position. |
The damper in
the uptakes is moved to the wide open position for a given number of seconds
and then moved to the low firing rate position. |
|
D |
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 |
|
B |
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. |
|
C |
Which of the following
statements describes how the fuel oil enters the whirling chambers of the
sprayer plates used in a auxiliary boiler return flow fuel oil system? |
Through the outer
barrel tube. |
Through the sprayer
plate drilled passages. |
Through tangential
slots in the sprayer plate. |
Through baffles
in the orifice plate. |
|
C |
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 |
|
B |
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 |
|
A |
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 |
|
B |
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 |
|
C |
Treatment of boiler
feedwater for the control of hardness is necessary to prevent __________. |
excessive feed
water alkalinity |
foaming |
waterside scale
deposits |
carryover |
|
B |
A unit of measure
used to express the chloride content of boiler water is __________. |
pH |
PPM |
Micro-Farads |
Micro-Ohms |
|
B |
Which of the listed
methods can be used to blow down a boiler without securing the fires? |
Bottom blow from
the mud drum. |
Steam drum surface
blow. |
Blow down the
front water wall header. |
Blow down the
rear water wall header. |
|
A |
Dissolved oxygen
can be removed from the boiler water by __________. |
treating the water
with chemical scavengers |
dumping and refilling
the boiler weekly |
passing the water
through absorbent filters |
frequent surface
and bottom blows |
|
A |
Eight (ounces
of oxygen, dissolved in 500,000 pounds of water, is a concentration of __________. |
1.0 ppm |
4.0 ppm |
8.0 ppm |
16.0 ppm |
|
C |
Proper use of
the boiler surface blow will __________. |
have no effect
on boiler alkalinity |
remove most precipitated
solids |
remove floating
impurities from boiler water |
disrupt circulation
in a steaming boiler |
|
D |
Chemicals are
added to boiler water to __________. |
stabilize feed
water if a boiler becomes salted up |
eliminate the
need for blow downs |
maintain an acidic
condition in the feed water |
prevent scale
forming deposits |
|
A |
Before giving
a boiler a bottom blow, it should be taken off the line and then the __________. |
water level initially
raised above normal |
water level initially
lowered below normal |
boiler air cock
should be cracked |
boiler steam pressure
should be increased |
|
A |
As the pH of the
boiler water approaches zero, the water becomes increasingly __________. |
acidic |
neutral |
alkaline |
soft |
|
A |
Normally a boiler
water sample should be taken __________. |
before the boiler
has been blown down or chemicals added |
from the highest
point in the feed system |
when the boiler
has been refilled with makeup |
after the boiler
has been blown down |
|
B |
A boiler water
sample being collected for analysis should be circulated through a cooling
coil because __________. |
the cool sample
has a higher conductivity measurement and the total dissolved solids in
the water are easier to identify |
this keeps the
water from flashing into steam as it is drawn from the higher pressure of
the boiler into atmospheric conditions |
it reduces the
amount of suspended matter that frequently finds its way into the dead end
lines |
the degree of
acidity as measured on the pH recorder is amplified by cool water temperatures |
|
C |
A boiler with
a water capacity of 10 tons, generates steam at the rate of 30 tons per
hour. If the feed water quality is 0.5 ppm, the concentration of solids
will increase 1.5 ppm every hour. What would be the increase in the concentration
of solids within 24 hours? |
12 ppm |
24 ppm |
36 ppm |
48 ppm |
|
D |
Testing boiler
water for chloride content will indicate the amount of __________. |
phosphates present
in the water |
total alkalinity
in the water |
methyl orange
that should be added |
dissolved salts
from sea contamination |
|
D |
The amount of
sodium phosphate in treated boiler water can be measured by a/an __________. |
alkalinity test |
chloride test |
sodium phosphorous
test |
phosphate test |
|
B |
A sample of boiler
water can be chemically tested for alkalinity by initially adding a few
drops of phenolphthalein and then slowly titrating the water sample until
the __________. |
sample color changes
from clear to pink |
sample color changes
from pink to clear |
entire concentration
of chlorides have been neutralized |
water sample pH
reaches 10.5 |
|
C |
What boiler water
chemistry is necessary to ensure the precipitation of hard scale forming
calcium? |
Boiler water should
be slightly acidic. |
Boiler water hardness
should be high. |
Boiler water should
have a reserve of phosphates. |
Hydrazine concentrations
should be at the proper level. |
|
C |
Phenolphthalein
is used as an indicator to test boiler water for __________. |
hardness |
chloride content |
alkalinity |
hydrazine |
|
A |
A dissolved oxygen
concentration of 8.0 ppm represents __________. |
8 ounces of oxygen
dissolved in 1,000,000 ounces of water |
8 lbs of oxygen
dissolved in 1,000,000 tons of water |
8 tons of oxygen
dissolved in 1,000,000 pounds of water |
80 ounces of oxygen
dissolved in 100,000 ounces of water |
|
A |
A water-tube boiler
can be laid up either wet or dry. If it is to be laid up wet, you should
__________. |
completely fill
the boiler with deaerated feed water and maintain a slight pressure |
drain and refill
the boiler when the pH goes above 6 |
drain and refill
the boiler each week |
completely fill
the boiler with water, then blow down to steaming level |
|
C |
The major reason
dissolved gases are removed from boiler feedwater is because they may cause
__________. |
condenser vacuum
loss |
vapor lock in
the feed pumps |
corrosive conditions
in the boiler |
a false boiler
water level |
|
D |
Ferrous sulfate
tends to go into solution in boiler water when the value of the hydrogen
ion concentration increases. Consequently, the water in a 900 psi boiler
should be __________. |
pure with zero
pH value |
pure and treated
to a pH value of 4.0 to 4.5 |
maintained at
a pH value of 7.0 |
pure and treated
to a pH value of 10.5 to 11.0 |
|
C |
Calcium minerals
in boiler water are precipitated out of solution by the use of which of
the listed chemicals? |
Sodium hydroxide |
Caustic soda |
Sodium phosphate |
Phenolphthalein |
|
C |
In the prevention
of moisture carryover from a marine boiler, one important consideration
is to __________. |
add foaming agents
to the boiler water |
properly treat
the boiler water with hydrazine |
control the amount
of boiler water solids |
maintain a high
boiler water level |
|
A |
Although accurate
tests of boiler water for dissolved oxygen are difficult to obtain on board
ship, you can be fairly certain of proper oxygen removal by __________. |
maintaining a
normal level of scavenging agents |
maintaining low
boiler water pH |
testing frequently
for total dissolved solids |
giving the boiler
frequent surface blows |
|
D |
An adequate phosphate
reserve should be maintained in boiler water to __________. |
remove dissolved
oxygen concentrations |
reduce the blow
down frequency |
maintain a pH
of 7 |
prevent hard scale
formation |
|
A |
When a boiler
water test indicates a pH value of 6, you should __________. |
chemically treat
to raise the pH to normal level |
begin a continuous
boiler blow down |
check the DC heater
for possible malfunction |
chemically treat
to lower the pH to normal level |
|
D |
Scale prevention
in boiler water is accomplished by adding treatment chemicals to __________. |
cause the water
to be neutral |
increase boiler
water acidity |
solidify the scale
as powder |
precipitate scale
forming salts into sludge |
|
B |
To minimize metal
corrosion, boiler water is best kept __________. |
fairly acidic |
alkaline |
slightly acidic |
neutral |
|
D |
If boiler water
chemicals are decreasing in one boiler and increasing in the other boiler,
while both are steaming at normal rates, a leak probably exists in the __________. |
feed water crossover
line |
superheater tubes |
economizer tubes |
internal desuperheater
flange |
|
D |
Boiler water hardness
is increased by_______. |
zero alkalinity
in the water |
improper operation
of the DC heater |
dissolved gases
in the water |
scale forming
salts in the feed water |
|
A |
Carbon dioxide
dissolved in boiler water is dangerous in a modern power boiler because
the gas __________. |
forms carbonic
acid which attacks the watersides |
combines with
sulfates to cause severe waterside pitting |
breaks the magnetic
iron oxide film inside boiler tubes |
combines with
oxygen to cause severe waterside scaling |
|
C |
A leak in a desuperheater
could be indicated by an __________. |
increased boiler
water compound level in the boiler with the affected desuperheater |
increased concentration
of dissolved oxygen in boiler water |
inability to maintain
proper boiler water pH or phosphate levels |
inability to maintain
control of boiler water suspended solids |
|
A |
Excessive alkalinity
of boiler water will cause __________. |
caustic embrittlement |
scale formation |
sodium sulfite
reacting with dissolved oxygen |
calcium carbonate
precipitation |
|
A |
The concentration
of total dissolved solids in the boiler water can increase as a result of
__________. |
insufficient blow
down |
zero water hardness |
frequent surface
blows |
dissolved oxygen
deaeration |
|
B |
Excessive carbon
dioxide formed by improper chemical treatment in the boiler may cause corrosion
in the __________. |
boiler generating
tubes |
condensate lines |
boiler superheater
tubes |
main and auxiliary
steam lines |
|
A |
A malfunction
in the DC heater is indicated by __________. |
the boiler requiring
excessive amounts of oxygen scavenging chemicals |
condensate coming
in contact with steam inside the heater |
water and steam
entering the DC heater at different temperatures |
air flowing from
the DC heater vent connection pipe |
|
B |
A boiler with
a water capacity of 10 tons, generates steam at the rate of 30 tons per
hour. If the feed water quality is 0.5 ppm, the concentration of solids
will increase 1.5 ppm every hour. What would be the increase in the concentration
of solids within 24 hours? |
48 ppm |
36 ppm |
24 ppm |
12 ppm |
|
C |
Testing boiler
water for chloride content will indicate the amount of __________. |
total alkalinity
in the water |
methyl orange
that should be added |
dissolved salts
from sea contamination |
phosphates present
in the water |
|
A |
A sample of boiler
water can be chemically tested for alkalinity by initially adding a few
drops of phenolphthalein and then slowly titrating the water sample until
the __________. |
sample color changes
from pink to clear |
water sample pH
reaches 10.5 |
entire concentration
of chlorides have been neutralized |
sample color changes
from clear to pink |
|
C |
Phenolphthalein
is used as an indicator to test boiler water for __________. |
chloride content |
hardness |
alkalinity |
hydrazine |
|
C |
A dissolved oxygen
concentration of 8.0 ppm represents __________. |
8 tons of oxygen
dissolved in 1,000,000 pounds of water |
8 lbs of oxygen
dissolved in 1,000,000 tons of water |
8 ounces of oxygen
dissolved in 1,000,000 ounces of water |
80 ounces of oxygen
dissolved in 100,000 ounces of water |
|
D |
Calcium minerals
in boiler water are precipitated out of solution by the use of which of
the listed chemicals? |
Phenolphthalein |
Caustic soda |
Sodium hydroxide |
Sodium phosphate |
|
A |
Although accurate
tests of boiler water for dissolved oxygen are difficult to obtain on board
ship, you can be fairly certain of proper oxygen removal by __________. |
maintaining a
normal level of scavenging agents |
maintaining low
boiler water pH |
testing frequently
for total dissolved solids |
giving the boiler
frequent surface blows |
|
A |
When a boiler
water test indicates a pH value of 6, you should __________. |
chemically treat
to raise the pH to normal level |
check the DC heater
for possible malfunction |
begin a continuous
boiler blow down |
chemically treat
to lower the pH to normal level |
|
D |
To minimize metal
corrosion, boiler water is best kept __________. |
slightly acidic |
neutral |
fairly acidic |
alkaline |
|
D |
If boiler water
chemicals are decreasing in one boiler and increasing in the other boiler,
while both are steaming at normal rates, a leak probably exists in the __________. |
superheater tubes |
economizer tubes |
feed water crossover
line |
internal desuperheater
flange |
|
B |
Carbon dioxide
dissolved in boiler water is dangerous in a modern power boiler because
the gas __________. |
combines with
oxygen to cause severe waterside scaling |
forms carbonic
acid which attacks the watersides |
combines with
sulfates to cause severe waterside pitting |
breaks the magnetic
iron oxide film inside boiler tubes |
|
A |
Excessive alkalinity
of boiler water will cause __________. |
caustic embrittlement |
sodium sulfite
reacting with dissolved oxygen |
calcium carbonate
precipitation |
scale formation |
|
C |
Excessive carbon
dioxide formed by improper chemical treatment in the boiler may cause corrosion
in the __________. |
boiler superheater
tubes |
boiler generating
tubes |
condensate lines |
main and auxiliary
steam lines |
|
C |
A malfunction
in the DC heater is indicated by __________. |
condensate coming
in contact with steam inside the heater |
air flowing from
vent condenser vent |
the boiler requiring
excessive amounts of oxygen scavenging chemicals |
water and steam
entering the DC heater at different temperatures |
|
A |
Air accumulated
in the inter condenser of the air ejector assembly is discharged directly
to the __________. |
after condenser |
high-pressure
turbine |
main condenser |
atmosphere |
|
B |
Which of the devices
listed is used to keep overheated condensate from flowing to the deaerating
feed tank? |
Fresh water cooler |
Recirculating
line to the main condenser |
Salt water cooler |
Recirculating
line to the main feed pump |
|
C |
The loop seal
connected to the main condenser returns the drains from the __________. |
after condenser |
vent condenser |
inter condenser |
All of the above. |
|
C |
Main condensate
recirculating systems are primarily intended to __________. |
balance and control
condensate temperatures at full load |
prevent excessive
overheating of the condensate pumps |
provide adequate
cooling water for the air ejector condensers |
vent accumulated
vapors from the condensate pump discharge |
|
D |
Which statement
is true concerning two-stage air ejector assemblies? |
The first stage
air ejector takes suction on the second stage to increase vacuum. |
Steam to the after
condenser is condensed and returned to the main condenser via the loop seal. |
Air is removed
from the condensate as it passes through the tubes. |
The steam/air
mixture from the main condenser is discharged by the first stage air ejector
to the inter condenser. |
|
B |
While vacuum is
being raised on the main unit and the turbine is being warmed, condensate
is recirculated to the main condenser to __________. |
cool the main
condenser shell for better vacuum |
ensure the condensation
of air ejector steam |
maintain a proper
DC heater water level |
provide a condenser
vacuum seal |
|
A |
The automatic
recirculating valve in the main condensate recirculating line is controlled
by a temperature sensor which is located at the __________. |
air ejector condensate
discharge |
condensate inlet
to the main air ejectors |
main condensate
pump suction |
main condensate
pump discharge |
|
C |
A salinity indicator
cell is located in the __________. |
low-pressure turbine
casing drain |
evaporator brine
suction line |
main condenser
hotwell |
sea water side
of the main condenser |
|
C |
Serious tube leaks
in the air ejector condenser assembly will cause __________. |
fouled nozzles |
faulty steam pressure |
loss of vacuum |
clogged steam
strainers |
|
D |
Why does air entry
into the main condenser reduce the efficiency of the steam cycle? |
Steam flow rate
through the main turbine increases |
Condensate sub
cooling in the main condenser increases |
The air mixes
with the steam and enters the condensate |
Low-pressure turbine
exhaust steam enthalpy value increases |
|
B |
Which statement
listed represents a vital function of the main condenser? |
Cooling of the
exhaust steam from the auxiliary exhaust system before it enters the deaerating
feed tank. |
The recovery of
feed water for reuse. |
Storage of feed
water for immediate use in the boilers. |
Condensing of
the exhaust steam from the main feed turbine pumps. |
|
B |
Which of the following
actions should be taken to re-establish a 'blown' air ejector loop seal? |
Decrease the steam
pressure to the air ejector nozzles. |
Momentarily close
the valve in the loop seal line, and then reopen slowly. |
Shut off the steam
to the second stage air ejector momentarily then open it again. |
Increase the condensate
flow through the air ejector. |
|
A |
When condenser
tube ends are rolled into both tube sheets, the different rates of material
expansion are compensated for by utilizing. |
expansion joints
in the condenser shell |
metallic packing
pressed around the tube ends |
threaded brass
ferrules on the tube ends |
belled joints
at both tube ends |
|
A |
While underway,
vacuum in the main condenser is primarily caused by the __________. |
condensing of
the exhausting steam |
after condenser
loop seal |
main air ejector |
suction drawn
by the condensate pump |
|
B |
The leakage of
air into the pump casing by way of the packing gland of a condensate pump,
is prevented by __________. |
the vacuum in
the pump suction |
a water seal line
to the packing gland |
special packing
in the stuffing box |
an air seal line
from the compressed air line |
|
D |
In a marine condenser
designed with a reheating hot well, the hot well is reheated by __________. |
recirculation
of condensate |
submerged heating
coils supplied with auxiliary exhaust steam |
a branch line
from the air ejector steam supply |
steam lanes in
the condenser |
|
C |
A main condenser
utilizing a scoop for the circulation of sea water must be constructed as
a __________. |
two-pass heat
exchanger |
counter flow heat
exchanger |
single-pass heat
exchanger |
parallel flow
heat exchanger |
|
C |
If the main condenser
were operating at a vacuum of 28.5" Hg, a condensate discharge temperature
of 86°F, a sea water inlet temperature of 72°F, and a sea water outlet temperature
of 79°F, what would be the condensate depression? Illustration SG-0026 |
0.2 inches Hg |
0.7 inches Hg |
4 degrees Fahrenheit |
7 degrees Fahrenheit |
|
B |
The differential
temperature of the main condenser cooling water will be significantly affected
by a change in __________. |
condensate pump
pressure |
volume of cooling
water flow |
boiler feed pump
pressure |
sea temperature |
|
C |
Air accumulated
in the after condenser of the air ejector unit is discharged directly to
the __________. |
main condenser |
inter condenser |
atmosphere |
high-pressure
turbine |
|
D |
Under normal conditions,
the rate of heat transfer in a feedwater heater is most greatly affected
by the __________. |
speed of the main
feed pump |
density of the
feed water |
pH of the feed
water |
temperature differential
between the steam and feed water |
|
C |
Which of the following
statements represents the function of a turbine gland exhaust condenser? |
Directs the gland
exhaust from the turbine sealing glands to the air ejector suction. |
Recovers condensate
from the gland leakage around the ahead and astern throttle valves. |
Assists in preheating
the condensate before it enters the DC heater. |
Recovers condensate
formed at the gland seal exhaust leak off. |
|
A |
The connections
labeled "A" in the illustration, are used to __________. Illustration
SG-0025 |
maintain a vacuum
in the shell of the feed water heater |
provide a point
of admission for the steam air heater drains |
provide a point
of admission for the L.P. bleed steam |
drain condensate
from the feed water heater to the main condenser |
|
A |
The unit shown
in the illustration is used as the __________. Illustration SG-0025 |
combined low-pressure
feed heater |
high-pressure
feed heater |
flash evaporator
salt water feed heater |
Butterworth feed
heater |
|
B |
A slight vacuum
is maintained in the shell of the first stage heater shown in the illustration.
The primary reason for the vacuum is to __________. Illustration SG-0025 |
provide a low-pressure
area to guarantee feed water flow to the heater |
maintain a positive
flow of steam as supplied by the main engine LP bleed system |
avoid the necessity
of having to use the condensate pumps |
force the use
of the main condenser as the drain cooler |
|
C |
The items labeled "A"
in the illustration are the __________. Illustration SG-0025 |
low-pressure steam
supply connections |
high-pressure
drain connections |
low-pressure vent
connections |
low-pressure drain
connections |
|
A |
The feed water
heater shown in the illustration is actually comprised of three separately
functioning heat exchangers. These heat exchangers are identified as the
__________. Illustration SG-0025 |
first-stage heater,
gland exhaust condenser, and drain cooler |
drain cooler,
distillate condenser, and fresh water drain collector |
inter condenser,
after condenser, and gland exhaust condenser |
first-stage heater,
inter condenser, and after condenser |
|
D |
Which of the following
statements is correct concerning the operation of the level or drain regulator
associated with the feed water heater shown in the illustration is correct?
Illustration SG-0025 |
The regulator
maintains the flow of steam into the first stage heater of this unit. |
The regulator
controls the flow rate of condensate leaving the feed water outlet. |
The regulator
controls the volume of condensate leaving the gland exhaust condenser. |
The regulator
controls the level of condensate collected in the drain cooler section. |
|
A |
The steam separator
as used in conjunction with a steam whistle normally drains to which of
the listed drain systems? |
High-pressure |
Low-pressure |
Contaminated |
Main turbine |
|
D |
The function of
item "E" shown in the illustration is to __________. Illustration
GS-0099 |
allow steam/condensate
or air to be evacuated from the unit as sound is produced |
act as a reed
to enable the production of sound |
pulse supply steam
or air to chamber "M" |
control the admission
of steam into chamber "L" as part of the process to produce sound |
|
D |
What type of sensor
is normally used with the automatic recirculating valve in the main condensate
line? |
Pressure |
Continuity |
Preset electric
timing sensor |
Thermostatic |
|
A |
The atmospheric
drain tank (ADT) normally drains to the__________. |
main and/or auxiliary
condenser |
distillate tank |
main and/or auxiliary
air ejector condenser |
reserve feed tanks |
|
A |
Which of the water
supplies listed below is typically used as a cooling medium for the gland
exhaust condenser, inter condenser, and after condenser of an air ejector
unit? |
Condensate |
Sea water |
Potable water |
Evaporator distillate |
|
B |
If a salinity
alarm system indicates 2.5 grains per gallon at the main condensate pump
discharge, your first action should be to __________. |
open the main
condensate recirculating valve |
chemically test
the condensate for chloride content |
increase the hydrazine
dosage in the condensate line |
blow down the
boilers and add make up water |
|
C |
Which of the listed
conditions will always result in dissolved oxygen being carried over from
the main condenser? |
Priming in the
boiler |
Dumping auxiliary
exhaust steam to the main condenser |
Taking on makeup
feed |
Excessive DC heater
temperature |
|
C |
Which of the components
listed prevents water from flowing back into the auxiliary exhaust line
if the deaerating feed tank becomes flooded? |
Reverse-acting
relief valve |
Exhaust piping |
Check valve |
Pumps |
|
D |
The DC heater
functions to __________. |
ensure recirculation
in the feed water system |
chemically treat
feed water to remove carbonic gas |
remove the major
amount of non-condensable gases from the main condenser |
store, heat, and
deaerate feed water |
|
A |
Cooling water
to the vent condenser in a DC heater is supplied by the __________. |
main and/or auxiliary
condensate pump |
main feed pump |
salt water circulator |
feed booster pump |
|
A |
In a main propulsion
steam turbine installation, the condensate pump initially discharges to
the __________. |
air ejector condenser |
distillate tank |
first stage heater |
deaerating feed
tank |
|
A |
The leakage of
air into the pump casing by way of the packing gland of a condensate pump,
is prevented by __________. |
a water seal line
to the packing gland |
the vacuum in
the pump suction |
an air seal line
from the compressed air line |
special packing
in the stuffing box |
|
B |
Condensate pumps
have distinctly noticeable characteristics and can usually be recognized
by their __________. |
open impellers
and power ends |
large suction
chambers and impeller eyes |
speed-limiting
governors and closed impellers |
multiple impellers
and pump shaft positions |
|
D |
If a ship is to
be laid up for an indefinite period, the steam side of the main condenser
should be __________. |
filled with moist
air |
pressurized to
approximately 5 psig with nitrogen, 99.5% pure by volume |
left under a vacuum |
completely drained
of water |
|
D |
Excessively hot
water returning to an atmospheric drain tank indicates __________. |
there is a loss
of circulating water |
the condensate
recirculating valve is open |
a heating coil
has ruptured |
a steam trap is
hung open |
|
D |
Scale in the air
ejector first-stage nozzle could cause a decrease in the __________. |
air ejector steam
supply pressure |
low-pressure turbine
exhaust temperature |
condensing temperature
in the condenser |
condenser vacuum |
|
A |
Which of the conditions
listed could prevent a centrifugal condensate pump from developing its rated
capacity? |
Closing the water
seal line to the packing gland. |
Venting the pump
to the vacuum side of the condenser. |
Flooding of the
main condenser hotwell. |
Operating the
pump with a positive suction head. |
|
B |
While maneuvering
out of port, you answer a stop bell. You notice a lot of steam coming out
of the gland exhaust condenser vent, in addition to the main condenser hot
well level being low. For this condition you should __________. |
increase steam
pressure to the air ejectors |
manually recirculate
condensate and add some makeup feed |
speed up the condensate
pump |
decrease gland
sealing steam pressure |
|
D |
Salt water contamination
of condensate could occur at which component? |
Inter condenser |
DC heater |
After condenser |
Fresh water evaporator |
|
A |
Clean, low pressure
steam drains are collected in the __________. |
atmospheric drain
tank |
main condenser
hotwell |
deaerating feed
water heater |
contaminated drain
inspection tank |
|
D |
From which of
the areas listed are condensate drains normally collected and returned to
the low-pressure drain system? |
Steam whistle
separator/trap |
Steam systems
operating in excess of 150 psi |
Each main feed
pump steam supply line |
Main and auxiliary
air ejector after condensers |
|
D |
A basic comparison
can be made between a low-pressure evaporator operation and a main condenser
with regards to the removal of non-condensable gases. The vacuum drag line
for the main condenser is specifically connected in which area? |
main tube bank |
steam lane |
hotwell |
air cooler section |
|
A |
Which of the listed
systems would be a potential source for the high-pressure drain system? |
Steam systems
operating in excess of 150 psi |
Fuel oil tank
heating coils |
Laundry steam
pressing machines |
Galley steam tables |
|
B |
Excess free oxygen
in the boiler feedwater can be the result of __________. |
improper operation
of the gland exhauster |
improper operation
of the DC heater |
steam leaks through
the turbine glands |
vapor lock in
the boiler feed pump |
|
A |
If the DC heater
relief valve lifts frequently, the cause can be excessive __________. |
auxiliary exhaust
steam pressure |
makeup feed introduced
to the system |
feed water recirculated
from the feed pump |
condensate supplied
to the DC heater |
|
D |
Which of the conditions
listed may be indicated by the lifting of the DC heater relief valve? |
Low water level
continually maintained in the DC heater. |
Excessive deaeration
of the feed water. |
Low back pressure
in the auxiliary exhaust line. |
A malfunctioning
auxiliary exhaust make-up steam regulating valve. |
|
A |
Excessive water
loss from the main feed system can be caused by __________. |
an atmospheric
drain tank trap frozen in the closed position |
a leak in the
desuperheater internal gasket |
a vapor bound
main condensate pump |
excessive recirculation
of condensate from the outlet of the air ejector condenser to the main condenser |
|
B |
In a closed feed
and water cycle, which of the conditions listed could prevent vacuum from
reaching the desired level? |
Steam pressure
to air ejectors maintained at 10 psig above designed supply pressure. |
Marine growth
on the cooling water side of the main condenser. |
Condensate recirculating
back to the condenser during maneuvering. |
Steam leaking
from the turbine glands. |
|
C |
The water level
in a steaming boiler has risen to within 2 inches of the top of the top
gage glass. Your immediate action should be to __________. |
secure the fires
and open the bottom blow valve |
open the surface
blow line |
reduce the feed
water flow to the boiler |
secure the feed
water flow to the boiler |
|
C |
On a steam vessel,
if a centrifugal main feed pump were operating at shutoff head with the
recirculating line closed, which of the following conditions could occur? |
Excessive diaphragm
seal wear in the feed water regulator. |
Water level in
the DC heater would decrease. |
Flashing at the
suction side of the pump. |
An increased water
level in the steam drum. |
|
B |
Air accumulated
in the inter condenser of the air ejector assembly is discharged directly
to the __________. |
main condenser |
after condenser |
atmosphere |
high pressure
turbine |
|
D |
Which statement
is true concerning two-stage air ejector assemblies? |
Steam to the after
condenser is condensed and returned to the main condenser via the loop seal. |
Air is removed
from the condensate as it passes through the tubes. |
The first stage
air ejector takes suction on the second stage to increase vacuum. |
The steam/air
mixture from the main condenser is discharged by the first stage air ejector
to the inter condenser. |
|
D |
Serious tube leaks
in the air ejector condenser assembly will cause __________. |
fouled nozzles |
clogged steam
strainers |
faulty steam pressure |
loss of vacuum |
|
D |
Why does air entry
into the main condenser reduce the efficiency of the steam cycle? |
The air mixes
with the steam and enters the condensate |
Condensate sub
cooling in the main condenser increases |
Steam flow rate
through the main turbine increases |
Low pressure turbine
exhaust steam enthalpy value increases |
|
C |
Which of the devices
listed is used to keep overheated condensate from flowing to the deaerating
feed tank? |
Recirculating
line to the main feed pump |
Freshwater cooler |
Recirculating
line to the main condenser |
Saltwater cooler |
|
D |
Which statement
listed represents a vital function of the main condenser? |
Storage of feed
water for immediate use in the boilers. |
Cooling of the
exhaust steam from the auxiliary exhaust system before it enters the deaerating
feed tank. |
Condensing of
the exhaust steam from the main feed turbine pumps. |
The recovery of
feed water for reuse. |
|
A |
The leakage of
air into the pump casing by way of the packing gland of a condensate pump,
is prevented by __________. |
a water seal line
to the packing gland |
an air seal line
from the compressed air line |
special packing
in the stuffing box |
the vacuum in
the pump suction |
|
B |
If the main condenser
were operating at a vacuum of 28.5" Hg, a condensate discharge temperature
of 86°F, a sea water inlet temperature of 72°F, and a sea water outlet temperature
of 79°F, what would be the condensate depression? Illustration SG-0026 |
0.2 inches Hg |
4 degrees Fahrenheit |
7 degrees Fahrenheit |
0.7 inches Hg |
|
A |
Air accumulated
in the after condenser of the air ejector unit is discharged directly to
the __________. |
atmosphere |
inter condenser |
high pressure
turbine |
main condenser |
|
A |
One of the basic
rules applying to the operation of a single-pass main condenser is that
the __________. |
cooling water
overboard should be about 10￉F higher than the inlet temperature |
vacuum must be
maintained at 29.92" of Hg. under all operating conditions |
quantity of reheating
steam flow through the condenser must be maintained at maximum under all
operating conditions |
condensate temperature
must never be allowed to drop below 104ï¾¹F |
|
A |
Maintaining low
pressure in a condensing turbine exhaust trunk __________. |
enables better
utilization of available heat energy to perform work |
eliminates creep
problems in the exhaust trunk during maneuvering |
reduces condensate
depression with low seawater temperature |
prevents steam
turbulence in the exhaust trunk due to steam laning |
|
C |
The connections
labeled "A" in the illustration, are used to __________. Illustration
SG-0025 |
provide a point
of admission for the L.P. bleed steam |
drain condensate
from the feed water heater to the main condenser |
maintain a vacuum
in the shell of the feed water heater |
provide a point
of admission for the steam air heater drains |
|
B |
The unit shown
in the illustration is used as the __________. Illustration SG-0025 |
Butterworth feed
heater |
combined low pressure
feed heater |
flash evaporator
salt water feed heater |
high pressure
feed heater |
|
C |
A slight vacuum
is maintained in the shell of the first stage heater shown in the illustration.
The primary reason for the vacuum is to __________. Illustration SG-0025 |
force the use
of the main condenser as the drain cooler |
provide a low
pressure area to guarantee feed water flow to the heater |
maintain a positive
flow of steam as supplied by the main engine LP bleed system |
avoid the necessity
of having to use the condensate pumps |
|
B |
The steam separator
as used in conjunction with a steam whistle normally drains to which of
the listed drain systems? |
Low pressure |
High pressure |
Contaminated |
Main turbine |
|
D |
Which of the following
statements represents the function of a turbine gland exhaust condenser? |
Recovers condensate
from the gland leakage around the ahead and astern throttle valves. |
Recovers condensate
formed at the gland seal exhaust leak off. |
Directs the gland
exhaust from the turbine sealing glands to the air ejector suction. |
Assists in preheating
the condensate before it enters the DC heater. |
|
A |
What type of sensor
is normally used with the automatic recirculating valve in the main condensate
line? |
Thermostatic |
Continuity |
Preset electric
timing sensor |
Pressure |
|
B |
High pressure
and low pressure drain systems are part of the __________. |
contaminated drain
system |
condensate drain
system |
auxiliary turbine
bleed system |
boiler drain system |
|
A |
Which of the components
listed prevents water from flowing back into the auxiliary exhaust line
if the deaerating feed tank becomes flooded? |
Check valve |
Reverse-acting
relief valve |
Pumps |
Exhaust piping |
|
B |
Cooling water
to the vent condenser in a DC heater is supplied by the __________. |
salt water circulator |
main and/or auxiliary
condensate pump |
feed booster pump |
main feed pump |
|
B |
In a main propulsion
steam turbine installation, the condensate pump initially discharges to
the __________. |
deaerating feed
tank |
air ejector condenser |
first stage heater |
distillate tank |
|
D |
The leakage of
air into the pump casing by way of the packing gland of a condensate pump,
is prevented by __________. |
the vacuum in
the pump suction |
special packing
in the stuffing box |
an air seal line
from the compressed air line |
a water seal line
to the packing gland |
|
B |
Condensate pumps
have distinctly noticeable characteristics and can usually be recognized
by their __________. |
speed-limiting
governors and closed impellers |
large suction
chambers and impeller eyes |
open impellers
and power ends |
multiple impellers
and pump shaft positions |
|
C |
If a ship is to
be laid up for an indefinite period, the steam side of the main condenser
should be __________. |
left under a vacuum |
filled with moist
air |
completely drained
of water |
pressurized to
approximately 5 psig with nitrogen, 99.5% pure by volume |
|
B |
Vapor blowing
from the air ejector condenser vent may be caused by __________. |
low condensate
temperature |
insufficient condensate
flow |
excessive condensate
pump speed |
excess makeup
feed being taken into the system |
|
B |
While maneuvering
out of port, you answer a stop bell. You notice a lot of steam coming out
of the gland exhaust condenser vent, in addition to the main condenser hot
well level being low. For this condition you should __________. |
speed up the condensate
pump |
manually recirculate
condensate and add some makeup feed |
decrease gland
sealing steam pressure |
increase steam
pressure to the air ejectors |
|
D |
Scale in the air
ejector first-stage nozzle could cause a decrease in the __________. |
condensing temperature
in the condenser |
low pressure turbine
exhaust temperature |
air ejector steam
supply pressure |
condenser vacuum |
|
B |
If the cooling
water flow through the air ejector intercondensers and aftercondensers is
inadequate, which of the problems listed will occur? |
Air ejector nozzles
will erode. |
Main condenser
absolute pressure will increase. |
DC heater level
will rise |
After condenser
will be flooded. |
|
C |
Excessively hot
water returning to an atmospheric drain tank indicates __________. |
there is a loss
of circulating water |
a heating coil
has ruptured |
a steam trap is
hung open |
the condensate
recirculating valve is open |
|
B |
Dissolved oxygen
in the condensate can result from __________. |
steam leaks into
the gland leak off |
air leaks through
the turbine glands |
improper operation
of the gland exhauster |
vapor lock in
the condensate pump |
|
D |
Salt water contamination
of condensate could occur at which component? |
Inter condenser |
DC heater |
After condenser |
Fresh water evaporator |
|
A |
If the salinity
indicator periodically registers high salinity in the main hot well, the
cause may be __________. |
a contaminated
distilled water tank |
leaking air ejector
condenser tubes |
excessive water
pressure in the lube oil cooler |
leaking tubes
in the third-stage heater |
|
A |
Which of the conditions
listed could prevent a centrifugal condensate pump from developing its rated
capacity? |
Closing the water
seal line to the packing gland. |
Operating the
pump with a positive suction head. |
Venting the pump
to the vacuum side of the condenser. |
Flooding of the
main condenser hot well. |
|
B |
Excessive condensate
depression can result in __________. |
high condensate
discharge temperature |
decreased plant
operating efficiency |
insufficient condensate
sub cooling |
overheated air
injectors |
|
D |
Which of the following
is the advantage of operating a typical closed feedwater system for a marine
boiler when compared to an open feedwater system? |
Reduced requirement
for condensate purity. |
Allows for lower
feed pump operating pressures. |
Reduced steam
requirement for feed water heating. |
Increased capability
of removing and controlling dissolved oxygen. |
|
B |
Deaeration of
condensate primarily occurs in what section of the illustration shown? Illustration
SG-0010 |
main condenser
hotwell |
DFT |
distilled water
tank |
first stage feed
heater |
|
A |
Which of the listed
components would be considered the dividing line separating the condensate
system from the feed water system? |
Deaerating feed
tank |
Main air ejectors |
Boiler drum |
Main condenser |
|
D |
The boiler feedwater
control valve varies the unity relationship between steam and water flow
during periods of __________. |
steady boiler
load |
minimum boiler
load |
overload operation |
load change |
|
C |
The net positive
suction head of a boiler centrifugal feed pump should be calculated over
and above the __________. |
speed of the impeller |
impeller ratio
of the pump |
feed water vapor
pressure |
pump capacity
in gpm |
|
B |
In the boiler
steam and water system, pressure is highest in the __________. |
dry pipe |
feed line |
steam stop |
mud drum |
|
B |
High-pressure
steam drains are normally discharged to the __________. |
atmospheric drain
line |
DC heater |
reserve feed tank |
drain and inspection
tank |
|
D |
Which of the listed
conditions aids in directing gland leak off steam from the low- pressure
propulsion turbine to pass through the gland exhaust condenser? |
Steam pressure
from the low-pressure turbine. |
Compressed air
in the air pilot. |
Steam pressure
from the high-pressure turbine. |
The use of a gland
exhauster fan. |
|
C |
Why is it necessary
to have a relief valve protecting the deaerating feed tank from internal
pressure? |
Because the tank
receives large amounts of water. |
Because the tank
receives auxiliary exhaust. |
Because the tank
receives high-pressure drains. |
Because the tank
drains to the main condenser. |
|
A |
A high water level
in a deaerating feed heater will cause the automatic dump valve to drain
condensate to the __________. |
reserve feed tank |
main condenser |
auxiliary condenser |
atmospheric drain
tank |
|
D |
Vent condensers
are usually an integral part of deaerating feed heaters and serve to condense
__________. |
the gases liberated
by the deaeration process |
only steam vented
from high-pressure steam traps |
steam vented from
high-pressure steam glands |
the steam vapor
entrained with the non-condensable gases |
|
C |
To provide emergency
feedwater supply to a steaming boiler, if it becomes necessary to secure
the DC heater, suction should be taken on the distilled water tank using
the __________. |
emergency injector
discharge |
feed booster pump |
emergency feed
pump |
main condensate
pump |
|
D |
During cold ship
start-up, you should open the feed water outlet and condensate valves to
a DC heater in order to __________. |
expel non-condensable
vapors from the vent |
prevent excessive
pressure |
thoroughly atomize
incoming condensate |
avoid running
the feed pump 'dry' |
|
B |
The purpose of
the steam control valves installed in the auxiliary exhaust line is to __________. |
preheat the condensate
before it enters the vent condenser |
control steam
admission and maintain the proper steam spray pattern in the DC heater |
regulate back
pressure in the desuperheater line |
seal the vent
condenser to prevent the escape of condensate |
|
D |
With the steam
control valve wide open during normal operation, the rate of steam flow
from the auxiliary exhaust steam line to the DC heater is actually a function
of __________. |
rate of evaporation
in the DC heater |
water level in
the DC heater reservoir |
spring pressure
of the spray valves |
rate of condensation
in the DC heater |
|
A |
The gland exhaust
fan draws steam and non-condensable vapors from the gland exhaust condenser
and discharges to the __________. |
atmosphere |
main condenser |
vent condenser |
atmospheric drain
tank |
|
A |
To prevent pulsations
from developing in the boiler feedwater lines, the discharge side of a reciprocating
feed pump is equipped with a/an __________. |
air chamber |
relief valve |
feed water regulator |
reed valve |
|
B |
If a centrifugal
main feed pump were operated at shutoff head with the recirculating line
closed, which of the following conditions could occur? |
A decreased water
level in the DC heater. |
Flashing at the
suction side of the pump. |
Excessive diaphragm
seal wear in the feed water regulator. |
An increased water
level in the steam drum. |
|
A |
The pressure in
the feedwater system must exceed boiler steam drum pressure in order to
__________. |
force the feed
water into the boiler |
remove the steam
from the steam drum |
prevent water
hammer in the lines |
prevent air leakage
into the feed water system |
|
D |
A turbine-driven
centrifugal feed pump used for boiler feed service should normally be stopped
by __________. |
closing off the
steam via the excess pressure pump governor |
opening wide the
recirculating valve and then manually closing the throttle |
slowly closing
the manual throttle |
hand activating
the over speed trip |
|
D |
During initial
starting of the standby turbine-driven boiler feed pump, which of the listed
valves should remain closed? |
Pump suction valve |
Turbine steam
supply valve |
Turbine exhaust
valve |
Pump discharge
check valve |
|
D |
Recirculation
of the feed water ensures a flow of water through the __________. |
third stage heater |
standby feed pump
suction line |
economizer |
main feed pump |
|
D |
If it is necessary
to operate a turbine driven main feed pump at shut off head, or at less
than 20% of its rated capacity, what will prevent the pump from overheating? |
A bypass or recirculating
line led back to the pump impeller eye or suction. |
Throttling of
the steam supply valve. |
Throttling of
the liquid discharge valve. |
A bypass or recirculating
line led back to the source of suction supply. |
|
D |
Which of the following
statements is correct regarding the start-up operation of a non-condensing
turbine-driven feed pump? |
Secure all drains
prior to admitting any steam to avoid damage to traps. |
Keep the steam
exhaust valve closed until steam is applied to ensure that the auxiliary
exhaust line pressure does not drop. |
Keep the pump
casing vent valve closed until flow is established through the pump. |
Open the pump
suction valve prior to admitting steam to the turbine. |
|
B |
The main boiler
feed pump discharge is controlled by the admission of steam to the auxiliary
turbine. The admission of steam is normally regulated by a __________. |
flyweight controlled
regulating valve |
constant pump
discharge pressure governor |
multi nozzle arrangement |
constant speed
limiting governor |
|
A |
Under EMERGENCY
operating conditions, the proper valve positions for controlling feedwater
to the boiler should be the __________. |
auxiliary stop
valve fully open and the auxiliary stop-check valve used to regulate the
amount of flow |
auxiliary stop-check
valve fully open and the auxiliary stop valve used to regulate the amount
of flow |
auxiliary stop
and stop-check valves fully open and the feed pump speed used to regulate
the amount of flow |
auxiliary stop-check
valve fully open and the auxiliary stop valve regulated by the feed water
regulator |
|
C |
In the system
illustrated the valves at point "A" are __________. Illustration
SG-0005 |
swing check/stop
valves |
globe valves/gate
valves |
stop-check/stop
valves |
gauge valves/drain
valves |
|
B |
When operating
with the auxiliary feed line, feedwater flow is controlled __________. |
automatically
by the main feed water regulator |
manually by throttling
the auxiliary feed stop-check valve |
manually by adjustment
of the auxiliary feed water regulator spring setting |
automatically
by the economizer bypass |
|
B |
The main feed
check valve functions to __________. |
reduce feed pump
discharge pressure loading |
prevent backflow
of water from the boiler in the event of a feed pump failure |
check pressure
pulsations in the feed line |
provide feed pump
positive discharge head |
|
C |
A boiler feed
stop valve must be mounted __________. |
between the feed
pump and the feed check valve |
at or near the
engine room operating platform |
between the feed
check valve and the boiler drum |
upstream of the
feed water regulator |
|
D |
Which piping system
is described in the illustration provided? Illustration SG-0010 |
Auxiliary desuperheated
steam system |
Main superheated
steam system |
Turbine bleed
steam system |
Boiler feed and
condensate system |
|
D |
If manual control
of the water level in a steaming boiler is required, the proper method of
control is with the auxiliary feed __________. |
stop valve |
pump pressure
control |
pump speed control |
stop-check valve |
|
A |
The boiler main
feed stop check valve is located nearest the __________. |
main feed water
regulator inlet |
DC heater feed
water outlet |
boiler water drum
inlet |
first stage feed
water heater outlet |
|
C |
A triple element,
main propulsion, boiler feedwater regulating system commonly used aboard
ship utilizes __________. |
two-position differential
gap action |
proportional action |
proportional plus
reset plus rate action |
proportional plus
reset action |
|
C |
A two-element
boiler feedwater regulator is controlled by __________. |
steam flow and
feed water flow |
drum water level
and drum pressure |
steam flow and
drum water level |
drum water level
and feed water flow |
|
C |
The two-element
feedwater regulator functions similarly to the three-element feedwater regulator,
but does not utilize __________. |
water level |
steam flow measurement |
feed water flow
measurement |
drum pressure |
|
C |
A pneumatic dual
element, main propulsion, boiler feedwater regulating system commonly used
aboard ship utilizes __________. |
two-position differential
action |
on off reset action |
proportional plus
reset action |
proportional action |
|
A |
A single element
boiler feed water regulating system used aboard ship utilizes |
proportional action |
proportional plus
reset action |
proportional plus
reset plus rate action |
two-position differential
gap action |
|
B |
A major difference
between the two element and the three element feed water regulator control
systems is that a three element system will additionally measure and incorporate
the __________. |
steam flow to
the feed water regulator |
feed water flow
as sensed variable |
drum water level
to the feed water regulator |
fuel oil flow
to the feed water regulator |
|
B |
Which type of
feedwater regulator listed provides the MOST effective regulation of boiler
water level under all operating conditions? |
Single-element |
Triple-element |
Monothermonic |
Double-element |
|
D |
When operating
with the auxiliary feed line, feedwater flow is controlled __________. |
automatically
by the main feed water regulator |
automatically
by the economizer bypass |
manually by adjustment
of the auxiliary feed water regulator spring setting |
manually by throttling
the auxiliary feed stop-check valve |
|
D |
While underway
on watch in the engine room of a steam vessel, the proper valve positions
for controlling feed water to the boiler using the auxiliary feed system
should be |
the stop and check
valves fully open and the feed pump speed used to regulate the amount of
flow |
the check valve
fully open and the stop valve regulated by the feed water regulator |
the auxiliary
check valve fully open and the stop valve used to regulate the amount of
flow |
the stop valve
fully open and the auxiliary check valve used to regulate the amount of
flow |
|
C |
Which system should
be tested and used when required to raise the water level in an idle boiler? |
Superheated steam
system |
Desuperheated
steam system |
Auxiliary feed
system |
Chemical feed
system |
|
D |
If the DC heater
relief valve lifts frequently, the cause can be excessive __________. |
condensate supplied
to the DC heater |
feed water recirculated
from the feed pump |
makeup feed introduced
to the system |
auxiliary exhaust
steam pressure |
|
D |
Which of the conditions
listed may be indicated by the lifting of the DC heater relief valve? |
Excessive deaeration
of the feed water. |
Low back pressure
in the auxiliary exhaust line. |
Low water level
continually maintained in the DC heater. |
A malfunctioning
auxiliary exhaust make-up steam regulating valve. |
|
D |
In a closed feed
and water cycle, which of the conditions listed could prevent vacuum from
reaching the desired level? |
Condensate recirculating
back to the condenser during maneuvering. |
Steam pressure
to air ejectors maintained at 10 psig above designed supply pressure. |
Steam leaking
from the turbine glands. |
Marine growth
on the cooling water side of the main condenser. |
|
B |
The water level
in a steaming boiler has risen to within 2 inches from the top of the gage
glass. Your immediate action should be to __________. |
secure the fires
and open the bottom blow valve |
reduce the feed
water flow to the boiler |
open the surface
blow line |
secure the feed
water flow to the boiler |
|
D |
The feed water
heater shown in the illustration was designed to maintain the required feed
water outlet temperature with an approximate 10" (25.4 cm) Hg shell
vacuum. If the shell vacuum is increased to approximately 16" (40.64
cm) Hg vacuum, the __________. Illustration SG-0025 |
flow rate of condensate
to the feed heater will increase |
overall plant
operating efficiency will increase |
vacuum in the
main condenser will drop as the feed heater shell vacuum increases |
feed water outlet
temperature will decrease |
|
B |
Which piping system
is described in the illustration provided. Illustration SG-0010 |
Auxiliary desuperheated
steam system |
Boiler feed and
condensate system |
Main superheated
steam system |
Turbine bleed
steam system |
|
D |
If manual control
of the water level in a steaming boiler is required, the proper method of
control is with the auxiliary feed __________. |
pump pressure
control |
pump speed control |
stop valve |
stop-check valve |
|
D |
The boiler main
feed stop check valve is located nearest the __________. |
DC heater feed
water outlet |
boiler water drum
inlet |
first stage feed
water heater outlet |
main feed water
regulator inlet |
|
A |
When operating
with the auxiliary feed line, feedwater flow is controlled __________. |
manually by throttling
the auxiliary feed stop-check valve |
automatically
by the main feed water regulator |
manually by adjustment
of the auxiliary feed water regulator spring setting |
automatically
by the economizer bypass |
|
B |
A boiler feed
stop-valve must be mounted __________. |
at or near the
engine room operating platform |
between the feed
check valve and the boiler drum |
upstream of the
feed water regulator |
between the feed
pump and the feed check valve |
|
C |
The pressure in
the feedwater system must exceed boiler steam drum pressure in order to
__________. |
prevent air leakage
into the feed water system |
prevent water
hammer in the lines |
force the feed
water into the boiler |
remove the steam
from the steam drum |
|
D |
Which of the following
statements is correct regarding the start-up operation of a non-condensing
turbine-driven feed pump? |
Secure all drains
prior to admitting any steam to avoid damage to traps. |
Keep the steam
exhaust valve closed until steam is applied to ensure that the auxiliary
exhaust line pressure does not drop. |
Keep the pump
casing vent valve closed until flow is established through the pump. |
Open the pump
suction valve prior to admitting steam to the turbine. |
|
C |
Recirculation
of the feed water ensures a flow of water through the __________. |
standby feed pump
suction line |
third stage heater |
main feed pump |
economizer |
|
B |
During initial
starting of the standby turbine-driven boiler feed pump, which of the listed
valves should remain closed? |
Turbine exhaust
valve |
Pump discharge
check valve |
Turbine steam
supply valve |
Pump suction valve |
|
D |
A turbine-driven
centrifugal feed pump used for boiler feed service should normally be stopped
by __________. |
opening wide the
recirculating valve and then manually closing the throttle |
slowly closing
the manual throttle |
closing off the
steam via the excess pressure pump governor |
hand activating
the over speed trip |
|
A |
Why is it necessary
to have a relief valve protect the deaerating feed tank from internal pressure? |
Because the tank
receives high pressure drains. |
Because the tank
drains to the main condenser. |
Because the tank
receives large amounts of water. |
Because the tank
receives auxiliary exhaust. |
|
B |
To provide emergency
feedwater supply to a steaming boiler, if it becomes necessary to secure
the DC heater, suction should be taken on the distilled water tank using
the __________. |
feed booster pump |
emergency feed
pump |
emergency injector
discharge |
main condensate
pump |
|
B |
High pressure
steam drains are normally discharged to the __________. |
reserve feed tank |
DC heater |
atmospheric drain
line |
drain and inspection
tank |
|
C |
The purpose of
the steam control valves installed in the auxiliary exhaust line is to __________. |
regulate back
pressure in the desuperheater line |
seal the vent
condenser to prevent the escape of condensate |
control steam
admission and maintain the proper steam spray pattern in the DC heater |
preheat the condensate
before it enters the vent condenser |
|
A |
The gland exhaust
fan draws steam and non-condensable vapors from the gland exhaust condenser
and discharges to the __________. |
atmosphere |
main condenser |
vent condenser |
atmospheric drain
tank |
|
C |
Deaeration of
condensate primarily occurs in what section of the illustration shown. Illustration
SG-0010 |
distilled water
tank |
main condenser
hot well |
DFT |
first stage feed
heater |
|
B |
Proper lagging
of a single-element feedwater regulator is accomplished by applying the
insulation material __________. |
only as necessary
to prevent possible injury |
to the steam connection,
but not water connection |
to both connections,
including finned areas |
to the water connection,
but not steam connection |
|
A |
A two-element
boiler feedwater regulator is controlled by __________. |
steam flow and
drum water level |
drum water level
and drum pressure |
drum water level
and feed water flow |
steam flow and
feed water flow |
|
D |
A pneumatic dual
element, main propulsion, boiler feedwater regulating system commonly used
aboard ship utilizes __________. |
two-position differential
action |
on off reset action |
proportional action |
proportional plus
reset action |
|
C |
A single element
boiler feed water regulating system used aboard ship utilizes |
two position differential
gap action |
proportional plus
reset action |
proportional action |
proportional plus
reset plus rate action |
|
B |
The property of
a fuel oil which is a measurement of its available energy, is known as its
__________. |
Cetane index |
heating value |
viscosity index |
Cetane number |
|
C |
Which combustible
element in fuel oil is considered a significant and major source of air
pollution? |
Hydrogen |
Vanadium |
Sulfur |
Nitrogen |
|
D |
The BTU value
of fuel oil is determined by a/an __________. |
open cup test |
hydrometer |
viscosimeter |
calorimeter |
|
D |
The flash point
of a residual fuel oil should be used to determine the highest temperature
to which the oil may be heated __________. |
in the recirculating
line |
for atomizing |
for centrifuging |
in a storage tank |
|
D |
Which of the significant
combustible elements of fuel oil is a major source of boiler corrosion? |
Carbon |
Oxygen |
Hydrogen |
Sulfur |
|
B |
The temperature
of the fuel oil received during bunkering operations is critical in determining
the __________. |
flash point at
which the fuel will burn |
expansion space
to leave in a tank |
rate at which
the fuel can be pumped during transfer operations |
temperature to
which the fuel must be heated |
|
B |
The minimum temperature
requirements for fuel oil in storage tanks is related to the __________. |
size of the vents |
pump ability of
the oil |
fire point of
the oil |
size of the containment
area in case of overflow |
|
C |
According to Coast
Guard Regulations (46 CFR), what is the minimum flash point of oil to be
used as fuel for the boilers? |
80°F (26.7°C) |
110°F (43.3°C) |
140°F (60.0°C) |
150°F (65.6°C) |
|
B |
The main reason
for having a low suction line on the fuel oil service or settling tanks
is to __________. |
prevent loss of
suction during rough weather |
facilitate water
removal |
decrease suction
head on the pump |
increase the amount
of fuel available for use |
|
B |
The most harmful
slag forming compounds found in fuel oils are __________. |
potassium and
nickel |
vanadium and sodium |
calcium and silica |
iron and sulfur |
|
A |
Which constituent
of fuel oil determines the specific heat? |
Hydrocarbons |
Oxygen |
Nitrogen |
Sulfur |
|
C |
When heated, fuel
oil will __________. |
increase in specific
gravity |
increase in viscosity |
expand in volume |
have a higher
specific heat |
|
C |
Using an oil temperature-viscosity
chart, you can determine the recommended __________. |
oil pressure for
smokeless operation |
fuel/air ratio
for efficient combustion |
oil temperature
for proper atomization |
fuel oil flash
point for best combustion |
|
A |
If the theoretical
quantity of dry air required to burn one pound of fuel oil is 13.75 pounds,
what is the weight of air per pound of fuel when operating a boiler at 5%
excess air? |
14.44 pounds |
15.13 pounds |
15.81 pounds |
16.50 pounds |
|
B |
If the stack temperature
is higher than normal, this could indicate __________. |
high feed water
pressure |
too much excess
air |
external boiler
casing leakage |
low fuel oil back
pressure |
|
A |
When testing boiler
flue gas with a chemical absorption apparatus, to obtain accurate results
__________. |
prevent any air
from contaminating the gas sample |
analyze for nitrogen
content before oxygen content |
run each analysis
for at least 3 minutes |
purge the apparatus
with air before use |
|
C |
The absence of
carbon monoxide in the flue gas of a boiler indicates __________. |
contaminated fuel
oil |
low carbon content
of fuel |
efficient combustion |
insufficient air |
|
C |
When burning fuel
oil in a boiler, a high CO2 content is desired in the stack gas because
__________. |
efficient combustion
is indicated and the heat liberated is equal to the heat produced by the
formation of CO |
less excess air
is required to produce CO2 than CO |
more heat is liberated
by the production of CO2 than CO |
efficient combustion
is indicated even though the heat liberated is less than the heat produced
by burning to CO |
|
B |
Assuming all burners
are clean and the fuel oil is at the correct temperature, it is considered
good practice to adjust the excess air until a light brown haze is obtained.
With the aid of a chemical based flue gas analyzer, the percentage readings
(not necessarily in order) should indicate. |
low CO2, no O2,
and high CO |
no CO, low O2,
and high CO2 |
high O2, low CO,
and low CO2 |
high CO, high
CO2, and no O2 |
|
B |
A mechanical carbon
dioxide recorder operates by detecting the difference between air and the
__________. |
soot content of
the flue gases |
specific weight
of the flue gases |
color of boiler
flue gases |
temperature of
the flue gases |
|
D |
A flue gas analysis
is performed to determine the __________. |
specific heat
of combustion products |
percentage of
nitrogen by volume |
carbon content
of the fuel being burned |
correct fuel/air
ratio for efficient combustion |
|
A |
Which of the following
chemicals is used in an Orsat apparatus to absorb carbon dioxide? |
Potassium hydroxide |
Cuprous chloride |
Pyrogallic acid |
Potassium chromate |
|
D |
If an analysis
of boiler flue gas determines there is no excess air for combustion, you
should expect the nitrogen content of the flue gas to be approximately __________. |
10.5 (%) |
14.0 (%) |
21.0 (%) |
79.0 (%) |
|
B |
Generally, a 12%
to 14% content of carbon dioxide in boiler flue gases indicates __________. |
too much excess
air |
proper combustion
of the fuel oil |
a high vanadium
content in the fuel oil |
carbon deposits
in the uptakes |
|
B |
Which of the following
fuel oil characteristics establishes the danger point when transferring,
pumping, and firing procedures are concerned? |
Viscosity |
Flash point |
Specific gravity |
Fire point |
|
A |
Which characteristic
of fuel oil is the most significant when determining the temperature to
which the fuel oil must be heated for proper atomization? |
Viscosity |
Flash point |
Specific gravity |
Pour point |
|
D |
Which of the following
actions should be taken FIRST when water is found in the fuel oil settling
tank? |
Shift to alternate
or standby fuel oil service pump. |
Determine the
extent of water contamination by reading the pneumercators. |
Sound the settling
tank with water indicating paste. |
Shift pump suction
to an alternate settling tank. |
|
D |
When you are transferring
fuel oil to the settling tanks, precautions to be observed should include
__________. |
plugging gooseneck
tank vents to prevent accidental overflow |
maintaining a
high transfer rate until a slight trickle of oil is observed flowing from
the overflow line |
maintaining a
supply of chemical dispersant to cleanup minor oil spills adjacent to the
ship |
sounding the tanks
frequently and reducing the transfer rate as the level approaches maximum
fill |
|
A |
When you are transferring
fuel oil from one double bottom tank to another, precautions to be observed
should include __________. |
sounding the tanks
frequently and reducing the transfer rate while topping off |
maintaining a
supply of chemical dispersant to cleanup minor oil spills adjacent to the
ship |
plugging gooseneck
tank vents to prevent accidental overflow |
maintaining a
high transfer rate until a slight trickle of oil is observed flowing from
the overflow line |
|
C |
Which of the pumps
listed takes fuel oil suction from the double bottom tanks and discharges
it to the settling tanks? |
Fuel oil service
pump |
Centrifugal type
general service pump |
Fuel oil transfer
pump |
Settler service
pump |
|
C |
Fuel oil is transferred
to the settling tanks for __________. |
heating to the
correct temperature for proper burner atomization |
purging of any
large air bubbles that have formed |
heating to allow
water and sediment to settle out |
the purpose of
removing any volatile gases present in the fuel |
|
B |
The process of
breaking up fuel oil into fine particles to ensure good combustion is called
__________. |
settling |
atomization |
straining |
pumping |
|
C |
Which of the terms
listed represents the ratio between the highest and lowest fuel oil pressure
at which the burners will remain ignited? |
Modulating band
ratio |
Firing range ratio |
Turndown ratio |
Air/fuel ratio |
|
D |
The entire unit
which houses the burner, air scoop, air doors and bladed cone is correctly
called the __________. |
air duct assembly |
burner assembly |
atomizer assembly |
register assembly |
|
D |
The component
labeled "F" as shown in the illustration is___________. Illustration
SG-0007 |
a permanently
installed Orsat apparatus |
one of the retractable
soot blower elements |
a regenerative
air heater |
one of the main
burner assemblies |
|
D |
The property of
a fuel oil which is a measurement of its available energy, is known as its
__________. |
viscosity index |
cetane number |
cetane index |
heating value |
|
D |
Which of the significant
combustible elements of fuel oil is a major source of boiler corrosion? |
Hydrogen |
Oxygen |
Carbon |
Sulphur |
|
C |
The most harmful
slag forming compounds found in fuel oils are __________. |
calcium and silica |
potassium and
nickel |
vanadium and sodium |
iron and sulphur |
|
A |
The minimum temperature
requirements for fuel oil in storage tanks is related to the __________. |
pumpability of
the oil |
size of the containment
area in case of overflow |
fire point of
the oil |
size of the vents |
|
B |
Which constituent
of fuel oil determines the specific heat? |
Sulphur |
Hydrocarbons |
Oxygen |
Nitrogen |
|
B |
Which combustible
element in fuel oil is considered a significant and major source of air
pollution? |
Hydrogen |
Sulfur |
Vanadium |
Nitrogen |
|
C |
The BTU value
of fuel oil is determined by a/an __________. |
open cup test |
hydrometer |
calorimeter |
viscosimeter |
|
D |
The flash point
of a residual fuel oil should be used to determine the highest temperature
to which the oil may be heated __________. |
in the recirculating
line |
for centrifuging |
for atomizing |
in a storage tank |
|
D |
When testing boiler
flue gas with a chemical absorption apparatus, to obtain accurate results
__________. |
run each analysis
for at least 3 minutes |
analyze for nitrogen
content before oxygen content |
purge the apparatus
with air before use |
prevent any air
from contaminating the gas sample |
|
B |
The absence of
carbon monoxide in the flue gas of a boiler indicates __________. |
low carbon content
of fuel |
efficient combustion |
insufficient air |
contaminated fuel
oil |
|
D |
When burning fuel
oil in a boiler, a high CO2 content is desired in the stack gas because
__________. |
efficient combustion
is indicated even though the heat liberated is less than the heat produced
by burning to CO |
efficient combustion
is indicated and the heat liberated is equal to the heat produced by the
formation of CO |
less excess air
is required to produce CO2 than CO |
more heat is liberated
by the production of CO2 than CO |
|
B |
A mechanical carbon
dioxide recorder operates by detecting the difference between air and the
__________. |
soot content of
the flue gases |
specific weight
of the flue gases |
color of boiler
flue gases |
temperature of
the flue gases |
|
D |
A flue gas analysis
is performed to determine the __________. |
percentage of
nitrogen by volume |
carbon content
of the fuel being burned |
specific heat
of combustion products |
correct fuel/air
ratio for efficient combustion |
|
D |
Which of the following
chemicals is used in an Orsat apparatus to absorb carbon dioxide? |
Potassium chromate |
Cuprous chloride |
Pyrogallic acid |
Potassium hydroxide |
|
C |
If an analysis
of boiler flue gas determines there is no excess air for combustion, you
should expect the nitrogen content of the flue gas to be approximately __________. |
10.5 (%) |
21 (%) |
79 (%) |
14 (%) |
|
C |
Generally, a 12%
to 14% content of carbon dioxide in boiler flue gases indicates __________. |
a high vanadium
content in the fuel oil |
carbon deposits
in the uptakes |
proper combustion
of the fuel oil |
too much excess
air |
|
A |
The temperature
of the fuel oil received during bunkering operations is critical in determining
the __________. |
expansion space
to leave in a tank |
flash point at
which the fuel will burn |
rate at which
the fuel can be pumped during transfer operations |
temperature to
which the fuel must be heated |
|
A |
When you are transferring
fuel oil to the settling tanks, precautions to be observed should include
__________. |
sounding the tanks
frequently and reducing the transfer rate as the level approaches maximum
fill |
maintaining a
high transfer rate until a slight trickle of oil is observed flowing from
the overflow line |
plugging gooseneck
tank vents to prevent accidental overflow |
maintaining a
supply of chemical dispersant to cleanup minor oil spills adjacent to the
ship |
|
A |
When you are transferring
fuel oil from one double bottom tank to another, precautions to be observed
should include __________. |
sounding the tanks
frequently and reducing the transfer rate while topping off |
maintaining a
supply of chemical dispersant to cleanup minor oil spills adjacent to the
ship |
maintaining a
high transfer rate until a slight trickle of oil is observed flowing from
the overflow line |
plugging gooseneck
tank vents to prevent accidental overflow |
|
B |
Which of the pumps
listed takes fuel oil suction from the double bottom tanks and discharges
it to the settling tanks? |
Centrifugal type
general service pump |
Fuel oil transfer
pump |
Settler service
pump |
Fuel oil service
pump |
|
A |
The main reason
for having a low suction line on the fuel oil service or settling tanks
is to __________. |
facilitate water
removal |
prevent loss of
suction during rough weather |
decrease suction
head on the pump |
increase the amount
of fuel available for use |
|
A |
Which of the following
actions should be taken FIRST when water is found in the fuel oil settling
tank? |
Shift pump suction
to an alternate settling tank. |
Shift to alternate
or standby fuel oil service pump. |
Determine the
extent of water contamination by reading the pneumercators. |
Sound the settling
tank with water indicating paste. |
|
A |
Fuel oil is transferred
to the settling tanks for __________. |
heating to allow
water and sediment to settle out |
heating to the
correct temperature for proper burner atomization |
the purpose of
removing any volatile gases present in the fuel |
purging of any
large air bubbles that have formed |
|
B |
The fins on the
tubes of a fin type fuel oil heater are provided to __________. |
prevent tube erosion |
increase heater
efficiency |
clean the fuel
oil |
decrease fuel
flow |
|
C |
The valve located
between the fuel oil header and the burner valve is known as the __________. |
header valve |
register valve |
root valve |
return valve |
|
B |
Strainers are
installed in boiler fuel oil service lines to __________. |
adsorb water |
remove solids |
absorb contaminants |
decrease viscosity |
|
C |
The boiler fuel
oil service pump normally takes suction from the __________. |
double bottom
fuel tanks |
contaminated drain
inspection tank |
fuel oil settler
tank |
fuel oil heater
discharge |
|
C |
The viscosity
of a residual fuel oil is measured in Saybolt __________. |
Milliliters Universal |
Minutes Universal |
Seconds Furol |
Millimeters Universal |
|
D |
The relief valve
on the discharge side of the fuel oil service pump may discharge directly
to the suction side of the pump, or to the __________. |
oil header return
line |
fuel oil heater
inlet |
double bottom
fuel tank |
fuel oil settling
tank |
|
A |
Pumps normally
used for fuel oil service are __________. |
positive displacement
rotary pumps |
nonvented plunger
pumps |
two-stage centrifugal
pumps |
explosion proof
gear pumps |
|
A |
All fuel oil service
pumps are equipped with a __________. |
remote means of
stopping the pump |
combustion control
valve on the discharge side |
relief valve on
the suction side |
direct suction
to the double bottom tanks |
|
B |
Fuel oil solenoid
valves at the burner fronts should be of the manual reset type to __________. |
permit the operator
to secure each burner during a blackout |
prevent the furnace
filling with oil after restoration of power |
permit the operator
to secure each burner after a blackout |
prevent the furnace
filling with oil during a power failure |
|
B |
All oil-fired
main propulsion burners with automatic safety control systems must automatically
close the burner valve when __________. |
the flame in boiler
furnace is confirmed |
actuated by a
boiler safety trip |
the burner is
properly seated |
starting "trial
for ignition" |
|
D |
The advantage
of a counter flow fuel oil heater, as compared to a parallel flow fuel oil
heater, is that the counter flow heater __________. |
has a larger heat
transfer area providing greater heat transfer |
is not subject
to coking if overheated |
has thinner tube
walls providing greater heat transfer |
produces a higher
oil temperature at any given steam temperature |
|
B |
A flame scanner
installed in modern boiler combustion control systems, functions to __________. |
monitor the stack
for soot fires |
monitor the intensity
of the burner flame |
regulate burner
fuel oil pressure |
regulate the air
flow to the furnace |
|
C |
When warming up
a fuel oil service system, you should open the steam supply to the fuel
oil heaters __________. |
before you start
the fuel oil service pump |
before you open
the recirculating valve |
after you start
the fuel oil service pump |
only if the settlers
are incapable of heating the oil |
|
D |
Valve "H"
shown in the illustration, functions to __________. Illustration SG-0009 |
prevent a backflow
from the manifold |
recirculate fuel
oil during start-up |
regulate the amount
of fuel burned |
provide a quick
shut off of fuel to the boiler |
|
A |
In the majority
of marine power plants, the fuel oil heater installations are divided into
several units because __________. |
plant operation
can be continued while repairs are being made to a defective unit |
auxiliary steam
is better utilized in this system |
oil leakage into
the condensate system is less likely with multiple system |
more heating is
required for lower loads |
|
C |
Fine adjustments
to a boiler combustion control system, to bring about near perfect combustion,
should be made by manually adjusting the __________. |
forced draft fan
dampers |
air volume regulators |
fuel/air ratio
knob |
fuel oil back
pressure |
|
C |
While trying to
light off a burner on a semi-automated boiler, you note that the fuel oil
solenoid valve at the burner will not stay open. Which of the following
conditions could cause this problem? |
The fuel oil pressure
at that burner is too high. |
The solenoid coil
is energized causing the valve to remain closed. |
The forced draft
air supply has failed. |
The flame scanner
is adjusted for excessive time delay in the ignition trial circuit. |
|
A |
A combustion control
system diaphragm type air flow transmitter receives its high pressure signal
from the boiler __________. |
wind box |
furnace |
fan discharge |
smoke box |
|
C |
The last two digits
stamped on a fuel oil atomizer sprayer plate represents the cross-sectional
area ratios of the tangential slots and orifice. This ratio determines the
__________. |
capacity of the
atomizer |
density of the
oil spray |
angle of the cone |
degree of atomization |
|
A |
What is indicated
by the code number 32Y20 stamped on a burner sprayer plate? |
Sprayer plate
orifice was made with a size 32 drill. |
Sprayer plate
requires a size 20 tip. |
Sprayer plate
orifice area is 0.32 square inch. |
Sprayer plate
requires a minimum of 20 psi fuel pressure. |
|
C |
In addition to
a nozzle, a fuel oil atomizer uses which of the listed parts? |
Burner cone |
Air cone |
Sprayer plate |
Ignition electrode |
|
A |
Which atomizing
sprayer plate has the largest capacity? |
2909 |
3009 |
2 PCRS 3509 |
4309 |
|
A |
The number '29'
on a fuel oil burner sprayer plate marked '2909' indicates the __________. |
orifice size |
slot cross-sectional
area |
whirling chamber
size |
cross-sectional
area ratio |
|
A |
The primary purpose
of the sprayer plate in a mechanical atomizing oil burner is to __________. |
produce a fine,
swirling, uniform fuel mist |
assist in mixing
atomizing steam with the fuel |
completely mix
air with the fuel |
prevent primary
air mixing with the fuel |
|
A |
The amount of
oil atomized by a straight mechanical fuel oil burner depends on the sprayer
plate size and the __________. |
fuel oil pressure |
forced draft pressure |
oil return pressure |
furnace air pressure |
|
B |
The illustrated
burner atomizer assembly is __________. Illustration SG-0022 |
used in a return
flow type burner management system |
straight mechanical |
an example of
a rotary cup type atomizer |
used only for
variable load steam atomization |
|
C |
In a steam assist
fuel oil atomizer, the steam pressure is higher than the oil pressure at
__________. |
design boiler
load |
high fuel viscosity |
minimum boiler
load |
low fuel viscosity |
|
B |
In most installations,
the firing rate of a boiler using steam atomization is indicated by the
__________. |
fuel oil return
pressure |
fuel oil supply
pressure |
burner register
opening |
steam atomization
temperature |
|
A |
In a steam assist
atomizer, the fuel oil/steam mix takes place entirely within the __________. |
mixing chamber |
fuel oil swirlers |
tangential slots |
whirling chamber |
|
D |
Compared to the
return flow oil burner system, an internally mixed steam atomizer requires
__________. |
higher air velocity |
higher fuel oil
viscosity |
greater turbulence
in the air/oil stream |
less excess air |
|
A |
The variable capacity
pressure atomizing fuel oil burner functions to __________. |
provide a wide
range of combustion |
maintain smokeless
fuel oil atomization |
maintain a constant
fuel temperature |
provide a constant
fuel return pressure |
|
B |
Boilers equipped
with steam atomizers can operate over a wide load range without cutting
burners in and out because __________. |
steam maintains
the oil at the fire point temperature |
steam velocity
aids in the atomizing of fuel oil over a wide range of fuel pressures |
atomizing steam
pressure is held constant for all load ranges |
it is not necessary
to regulate fuel oil pressure at the burners with this system |
|
D |
According to the
illustration, what part number identifies the "air door handle"?
Illustration SG-0016 |
4 |
6 |
7 |
12 |
|
D |
Which of the following
represents the function of the diffuser used with a mechanical atomizing
oil burner? |
Complete the vaporization
of the fuel for combustion. |
Control the amount
of secondary combustion air. |
Finely divide
the fuel particles into a cone-shaped spray. |
Provide flame
stability at the atomizer tip. |
|
A |
According to the
illustration, what part number identifies the "igniter"? Illustration
SG-0016 |
2 |
3 |
7 |
9 |
|
D |
What is the purpose
of the movable air doors in an air register? |
Maintain air flow
across the forced draft fan. |
Support the burner
distance piece. |
Regulate the temperature
of air entering the furnace. |
Function to open
and close the register. |
|
B |
According to the
illustration, what part number identifies the "air doors"? Illustration
SG-0016 |
1 |
3 |
9 |
4 |
|
D |
In an air register
assembly, the majority of air passes through the __________. |
atomizer assembly |
diffuser or impeller |
distance piece |
stationary air
foil or blade cone |
|
C |
According to the
illustration, what part number identifies the "diffuser"? Illustration
SG-0016 |
1 |
3 |
9 |
7 |
|
B |
The purpose of
a 'peep' hole in the boiler casing is to __________. |
check for excess
smoke in the stack |
examine the condition
of the flame |
examine the condition
of the refractory cones |
check the operation
of the soot blowers |
|
D |
Which of the following
represents the proper color of the flame end farthest from the boiler burner
during normal operations? |
Dark brown |
Dazzling white |
Light brown haze |
Bright yellow
or orange |
|
A |
Which of the following
procedures represents the proper care of unused burners during low load
conditions? |
They should be
removed, cleaned and stored in the rack on the burner bench. |
They may be left
in place, but only if they are clean and if fuel oil is recirculated to
provide cooling. |
They may be left
in place, with fuel and steam secured as long as they are not fouled. |
They should be
removed, cleaned, refitted with smaller tips and reinstalled to be ready
for immediate use. |
|
D |
To obtain the
best mixing of air and fuel with a fuel oil atomizer, you need to adjust
the __________. |
primary and secondary
air cones for desired air flow |
total air volume
admitted to the boiler furnace |
diffuser to the
desired flow |
atomizer position
using the distance piece |
|
B |
Which precaution
should be observed to prevent damage to the fuel oil service pump when warming
up the fuel service system? |
Bypass the fuel
oil meter so that recirculating oil does not register. |
Close the recirculating
valve when the proper atomization temperature is reached. |
Strip all water
from the fuel oil settlers. |
Heat the fuel
oil in the settlers to the atomization temperature. |
|
D |
If one burner
of a group of operating steam atomizing burners in a steaming boiler is
cut out, the register doors for that burner should be __________. |
left wide open |
closed halfway |
left cracked open |
closed tightly |
|
C |
To properly remove
the burner tip nut from the burner barrel, the barrel should be __________. |
clamped in a machinist's
vice on the work bench |
fixed in the burner
stowage rack |
held by the fixture
on the burner cleaning bench |
removed from the
gooseneck before removing the tip nut |
|
D |
In a boiler furnace,
incomplete combustion due to insufficient air yields an excess amount of
__________. |
sulfur dioxide |
carbon dioxide |
nitrogen oxide |
carbon monoxide |
|
B |
Insufficient air
for combustion in a boiler furnace could result in a __________. |
0% carbon monoxide
level |
black stack smoke
emission |
white incandescent
flame |
high flame temperature |
|
C |
If a boiler is
smoking black and increasing the boiler front air box pressure does not
reduce the smoke, the cause can be __________. |
forced draft fan
failure |
high ambient air
temperature |
dirty atomizers |
heavy soot on
tubes |
|
C |
Throttling the
burner air register of a lit burner could result in__________. |
excess combustion
temperature in the furnace |
carbon deposits
on the register doors |
carbon deposits
on the furnace walls |
too much excess
air for combustion |
|
A |
Accumulation of
fuel oil in the boiler double casing could be caused by _________. |
dripping atomizers |
leaking fuel oil
strainers |
high atomizing
steam pressure |
faulty steam atomizer
return traps |
|
D |
Excessive accumulation
of carbon deposits on a boiler burner throat ring and diffuser could result
in __________. |
a reduced boiler
fuel oil pressure |
increased heat
transfer and overheating |
too much excess
combustion air |
a decrease in
boiler efficiency |
|
D |
When a boiler
flareback occurs, you should __________. |
reduce the forced
draft blower speed |
increase the fuel
oil supply pressure |
take the boiler
off the line |
close the master
fuel oil valve |
|
B |
Insufficient combustion
air supply will cause an atomizer flame to appear as a __________. |
ragged flame |
dull red flame
with black streaks |
pointed flame |
light yellow flame
with white streaks |
|
A |
Boiler furnace
brickwork can be fractured and broken by thermal shock caused by __________. |
leaving the registers
open on a hot boiler |
load changes on
the boiler while answering bells |
allowing the furnace
to cool too slowly |
cold feed water
passing through the boiler economizer |
|
B |
Which of the conditions
listed can cause the flame of a mechanically atomized burner to be blown
away from the burner tip when you are attempting to light off? |
Insufficient excess
air is being supplied to the furnace. |
The diffuser is
burned out. |
Fuel oil viscosity
is too low. |
The secondary
air cone is improperly adjusted. |
|
B |
Poor atomization
accompanied by an elongated flame from a steam atomization burner is MOST
likely caused by __________. |
improper operation
of traps in atomizing steam return piping |
the fuel oil temperature
being too low |
the forced draft
fan too slow for the boiler load |
an improper Cetane
number |
|
D |
Fluctuations in
the atomizing steam pressure at the burners could be caused by a/an __________. |
partially closed
atomizing fuel valve |
partially opened
recirculating valve |
incorrectly assembled
air register |
malfunctioning
steam trap in the atomizing steam system |
|
D |
In a multi-burner
firebox, a burner tip with a worn and enlarged orifice will __________. |
cause a high fuel
oil return line back pressure |
cause smokeless
and flameless combustion |
have no effect
on the flow of oil if the proper pressure is maintained |
result in an uneven
flow of oil through the burner |
|
B |
If the temperature
of the fuel oil entering an atomizer is too low, the burner will __________. |
require more fuel
for atomization |
produce heavy
black smoke at any load condition |
produce smoke
white |
require more excess
air for combustion |
|
D |
If one fuel oil
strainer of a duplex unit becomes clogged while the vessel is steaming at
sea, the FIRST action should be to __________. |
clean the dirty
strainer as quickly as possible |
open the strainer
bypass valve |
stop the fuel
oil service pump |
change the oil
flow over to the clean side |
|
D |
A leaky fuel oil
heater relief valve could be indicated by an increase in the __________. |
contaminated drain
tank level |
fuel oil service
pump pressure |
sludge tank level |
discharge piping
temperature |
|
B |
Condensate accumulation
in the steam side of a fuel oil heater could result in __________. |
water contamination
of the fuel oil |
reduced heating
capacity in an operating heater |
annealing of the
heater tube bundles |
scale accumulation
in an operating heater |
|
C |
The rate of fouling
on the oil side of a fuel oil heater is inversely related to the __________. |
pressure on the
oil in the heater |
shape of the heating
coils in the heater |
flow rate of fuel
oil through the heater |
quality of steam
flowing through the heater |
|
C |
If oil is found
in the main fuel oil heater steam drain system, which of the actions listed
should be taken first? |
Change over fuel
supply to diesel fuel. |
Bottom blow the
boiler using the continuous blow line. |
Shift over to
the standby heater and monitor contaminated drain tank for additional traces
of oil. |
Shift over to
the low fuel oil suction on the day tank. |
|
A |
As found in a
basic pneumatic automatic combustion control system, the function of a standardizing
relay is to __________. |
introduce a control
for maintaining constant steam pressure regardless of boiler load |
introduce a control
for maintaining constant superheated steam temperature regardless of boiler
load |
control the boiler
drum water level within acceptable limits regardless of the load |
provide a backup
means for manual control of the system |
|
B |
When firing a
boiler in local manual control, an increase in boiler load must be accompanied
by a/an __________. |
decrease in the
forced draft air pressure before a decrease in the fuel oil flow |
increase in the
forced draft air pressure before an increase in the fuel oil flow |
increase in the
fuel oil flow before an increase in the forced draft pressure |
increase or a
decrease in the fuel oil flow and forced draft air pressure simultaneously |
|
A |
In an automatically
fired boiler, the steam pressure regulator controls the supply of fuel oil
to the burners by responding to variations in the __________. |
steam header pressure |
burner flame intensity |
steam drum water
level |
master fuel oil
solenoid valve position |
|
B |
In automated boiler
operations, a dirty flame scanner will most likely result in __________. |
loss of forced
draft air |
securing fuel
oil to the burner |
incomplete purge
cycle |
increased fuel
oil consumption |
|
C |
When the flame
scanner senses flame failure during boiler operation, which of the listed
events will occur FIRST? |
The automatic
purge cycle commences. |
The 'trial for
ignition' period commences. |
The fuel oil solenoid
valve is de-energized. |
The fuel oil service
pump is stopped. |
|
B |
A photoelectric
cell is installed in an oil fired boiler safeguard system to introduce proper
resistance values to the electronic control circuit. This device is primarily
sensitive to |
light emitted
from the back wall incandescent brickwork |
the blue portion
of the flame spectrum |
light emitted
from the front wall incandescent brickwork |
the orange portion
of the flame spectrum |
|
C |
Combustion control
systems on automatic boilers are designed to prevent immediate burner ignition
after a normal or safety shutdown in order to allow time for. |
the fuel pump
to start |
the drum level
to equalize |
the furnace to
be purged |
electric charge
buildup in the igniter |
|
B |
Which of the following
represents a significant system limitation to be aware of when a burner
management system is operated in the 'HAND' mode? |
The burner is
not capable of maintaining a high firing rate when the boiler is in the
'HAND' mode. |
Some boiler safety
interlocks are bypassed when the boiler is 'HAND' fired. |
The burner sequence
control is fully automatic even in the 'HAND' mode. |
The flame failure
alarm cannot function when the boiler is 'HAND' fired. |
|
A |
In automatic combustion
control systems, increasing or decreasing a loading pressure by a set amount
is called __________. |
biasing |
relaying |
loading |
transmitting |
|
C |
If an automatically
fired burner ignites, but repeatedly goes out within two seconds, the cause
could be a/an __________. |
faulty pressure
signal to the time delay relay circuit |
excessively high
fuel oil temperature |
dirty flame scanner
window |
burned out solenoid
coil in the low fire oil valve |
|
C |
Modern day boiler
automation allows bypassing the "flame safeguard" system to permit
a burner to have a "trial for ignition" period during burner light
off. This period may not exceed __________. |
5 seconds |
10 seconds |
15 seconds |
30 seconds |
|
A |
In a boiler automation
system, if a burner fuel oil solenoid valve continually trips closed under
normal steaming conditions, you should __________. |
secure the burner
and determine the cause of the valve failure |
wedge the valve
in the open position and report it to the chief engineer |
wedge the valve
in the open position and reduce the fuel oil pressure at that burner |
bypass the solenoid
valve and enter the fact in the logbook |
|
A |
While your vessel
is steaming with one boiler, the automatic combustion control system sensing
line for the idle boiler is accidentally opened. How will this affect the
steaming boiler? |
The steam pressure
will rise. |
The water level
will drop. |
The water level
will rise. |
The steam pressure
will drop. |
|
C |
The relief valve
on the discharge side of the fuel oil service pump may discharge directly
to the suction side of the pump, or to the __________. |
double bottom
fuel tank |
fuel oil heater
inlet |
fuel oil settling
tank |
oil header return
line |
|
B |
Pumps normally
used for fuel oil service are __________. |
explosion proof
gear pumps |
positive displacement
rotary pumps |
nonvented plunger
pumps |
two-stage centrifugal
pumps |
|
A |
Valve "H"
shown in the illustration, functions to __________. Illustration SG-0009 |
provide a quick
shut off of fuel to the boiler |
recirculate fuel
oil during start-up |
prevent a backflow
from the manifold |
regulate the amount
of fuel burned |
|
D |
The valve located
between the fuel oil header and the burner valve is known as the __________. |
return valve |
register valve |
header valve |
root valve |
|
D |
The primary purpose
of the sprayer plate in a mechanical atomizing oil burner is to __________. |
assist in mixing
atomizing steam with the fuel |
prevent primary
air mixing with the fuel |
completely mix
air with the fuel |
produce a fine,
swirling, uniform fuel mist |
|
C |
The amount of
oil atomized by a straight mechanical fuel oil burner depends on the sprayer
plate size and the __________. |
oil return pressure |
furnace air pressure |
fuel oil pressure |
forced draft pressure |
|
D |
The illustrated
burner atomizer assembly is __________. Illustration SG-0022 |
an example of
a rotary cup type atomizer |
used only for
variable load steam atomization |
used in a return
flow type burner management system |
straight mechanical |
|
D |
In a steam assist
fuel oil atomizer, the steam pressure is higher than the oil pressure at
__________. |
design boiler
load |
high fuel viscosity |
low fuel viscosity |
minimum boiler
load |
|
B |
In most installations,
the firing rate of a boiler using steam atomization is indicated by the
__________. |
burner register
opening |
fuel oil supply
pressure |
fuel oil return
pressure |
steam atomization
temperature |
|
C |
In a steam assist
atomizer, the fuel oil/steam mix takes place entirely within the __________. |
fuel oil swirliers |
whirling chamber |
mixing chamber |
tangential slots |
|
B |
Compared to the
return flow oil burner system, an internally mixed steam atomizer requires
__________. |
greater turbulence
in the air/oil stream |
less excess air |
higher air velocity |
higher fuel oil
viscosity |
|
D |
Boilers equipped
with steam atomizers can operate over a wide load range without cutting
burners in and out because __________. |
atomizing steam
pressure is held constant for all load ranges |
steam maintains
the oil at the fire point temperature |
it is not necessary
to regulate fuel oil pressure at the burners with this system |
steam velocity
aids in the atomizing of fuel oil over a wide range of fuel pressures |
|
B |
A boiler has a
steam delivery capacity of 100,000 pounds per hour, and is equipped with
four steam atomizing burners. If the load range of the burners is 4 to 1,
this means that __________. |
the boiler may
be operated down to 25,000 pounds per hour only after three burners are
secured |
the boiler may
be operated down to 25,000 pounds per hour without securing any burners |
all four burners
combined can supply up to 400,000 pounds of steam per hour |
if two burners
are operating, steam output will be a minimum of 50,000 pounds per hour |
|
C |
According to the
illustration, what part number identifies the "air door handle"?
Illustration SG-0016 |
6 |
4 |
12 |
7 |
|
B |
According to the
illustration, what part number identifies the "igniter"? Illustration
SG-0016 |
3 |
2 |
9 |
7 |
|
A |
In an air register
assembly, the majority of air passes through the __________. |
stationary air
foil or blade cone |
distance piece |
diffuser or impeller |
atomizer assembly |
|
D |
According to the
illustration, what part number identifies the "diffuser"? Illustration
SG-0016 |
7 |
3 |
1 |
9 |
|
D |
The purpose of
a 'peep' hole in the boiler casing is to __________. |
examine the condition
of the refractory cones |
check for excess
smoke in the stack |
check the operation
of the soot blowers |
examine the condition
of the flame |
|
B |
The fins on the
tubes of a fin type fuel oil heater are provided to __________. |
decrease fuel
flow |
increase heater
efficiency |
prevent tube erosion |
clean the fuel
oil |
|
B |
When warming up
a fuel oil service system, you should open the steam supply to the fuel
oil heaters __________. |
before you start
the fuel oil service pump |
after you start
the fuel oil service pump |
only if the settlers
are incapable of heating the oil |
before you open
the recirculating valve |
|
B |
Boiler furnace
brickwork can be fractured and broken by thermal shock caused by __________. |
allowing the furnace
to cool too slowly |
leaving the registers
open on a hot boiler |
load changes on
the boiler while answering bells |
cold feed water
passing through the boiler economizer |
|
A |
Which of the conditions
listed can cause the flame of a mechanically atomized burner to be blown
away from the burner tip when you are attempting to light off? |
The diffuser is
burned out. |
Insufficient excess
air is being supplied to the furnace. |
Fuel oil viscosity
is too low. |
The secondary
air cone is improperly adjusted. |
|
D |
Fluctuations in
the atomizing steam pressure at the burners could be caused by a/an __________. |
partially opened
recirculating valve |
partially closed
atomizing fuel valve |
incorrectly assembled
air register |
malfunctioning
steam trap in the atomizing steam system |
|
B |
In a multi-burner
firebox, a burner tip with a worn and enlarged orifice will __________. |
cause smokeless
and flameless combustion |
result in an uneven
flow of oil through the burner |
have no effect
on the flow of oil if the proper pressure is maintained |
cause a high fuel
oil return line back pressure |
|
D |
If the temperature
of the fuel oil entering an atomizer is too low, the burner will __________. |
require more fuel
for atomization |
produce smoke
white |
require more excess
air for combustion |
produce heavy
black smoke at any load condition |
|
B |
A leaky fuel oil
heater relief valve could be indicated by an increase in the __________. |
sludge tank level |
discharge piping
temperature |
contaminated drain
tank level |
fuel oil service
pump pressure |
|
B |
Condensate accumulation
in the steam side of a fuel oil heater could result in __________. |
scale accumulation
in an operating heater |
reduced heating
capacity in an operating heater |
water contamination
of the fuel oil |
annealing of the
heater tube bundles |
|
D |
The rate of fouling
on the oil side of a fuel oil heater is inversely related to the __________. |
shape of the heating
coils in the heater |
quality of steam
flowing through the heater |
pressure on the
oil in the heater |
flow rate of fuel
oil through the heater |
|
C |
If oil is found
in the main fuel oil heater steam drain system, which of the actions listed
should be taken first? |
Change over fuel
supply to diesel fuel. |
Bottom blow the
boiler using the continuous blow line. |
Shift over to
the standby heater and monitor contaminated drain tank for additional traces
of oil. |
Shift over to
the low fuel oil suction on the day tank. |
|
C |
Flame scanners
are used with boiler combustion control systems to monitor flame quality
and to __________. |
secure the fuel
oil service pump in the event of a floor fire |
regulate the fuel/air
ratio controller for more efficient combustion |
shut off the fuel
supply if flame failure is detected |
secure the forced
draft fan in the event of a flame failure |
|
D |
The photoelectric
cell installed as part of the combustion safety controls of an automatically
fired boiler will __________. |
close the control
circuit upon sensing a flame failure |
open the control
circuit upon sensing an intense flame |
control the modulating
pressure control circuit |
sense light from
the burner flame |
|
B |
Which of the following
represents a significant system limitation to be aware of when a burner
management system is operated in the 'HAND' mode? |
The flame failure
alarm cannot function when the boiler is 'HAND' fired. |
Some boiler safety
interlocks are bypassed when the boiler is 'HAND' fired. |
The burner sequence
control is fully automatic even in the 'HAND' mode. |
The burner is
not capable of maintaining a high firing rate when the boiler is in the
'HAND' mode. |
|
A |
In automatic combustion
control systems, increasing or decreasing a loading pressure by a set amount
is called __________. |
biasing |
loading |
relaying |
transmitting |
|
B |
As found in a
basic pneumatic automatic combustion control system, the function of a standardizing
relay is to __________. |
introduce a control
for maintaining constant superheated steam temperature regardless of
boiler load |
introduce a control
for maintaining constant steam pressure regardless of boiler load |
provide a backup
means for manual control of the system |
control the boiler
drum water level within acceptable limits regardless of the load |
|
A |
In an automatically
fired boiler, the steam pressure regulator controls the supply of fuel oil
to the burners by responding to variations in the __________. |
steam header pressure |
steam drum water
level |
burner flame intensity |
master fuel oil
solenoid valve position |
|
D |
Fine adjustments
to a boiler combustion control system, to bring about near perfect combustion,
should be made by manually adjusting the __________. |
fuel oil back
pressure |
forced draft fan
dampers |
air volume regulators |
fuel/air ratio
knob |
|
B |
While trying to
light off a burner on a semi-automated boiler, you note that the fuel oil
solenoid valve at the burner will not stay open. Which of the following
conditions could cause this problem? |
The flame scanner
is adjusted for excessive time delay in the ignition trial circuit. |
The forced draft
air supply has failed. |
The fuel oil pressure
at that burner is too high. |
The solenoid coil
is energized causing the valve to remain closed. |
|
D |
While your vessel
is steaming with one boiler, the automatic combustion control system sensing
line for the idle boiler is accidentally opened. How will this affect the
steaming boiler? |
The water level
will drop. |
The water level
will rise. |
The steam pressure
will drop. |
The steam pressure
will rise. |
|
D |
In a boiler automation
system, if a burner fuel oil solenoid valve continually trips closed under
normal steaming conditions, you should __________. |
wedge the valve
in the open position and reduce the fuel oil pressure at that burner |
bypass the solenoid
valve and enter the fact in the logbook |
wedge the valve
in the open position and report it to the chief engineer |
secure the burner
and determine the cause of the valve failure |
|
C |
If an automatically
fired burner ignites, but repeatedly goes out within two seconds, the cause
could be a/an __________. |
excessively high
fuel oil temperature |
faulty pressure
signal to the time delay relay circuit |
dirty flame scanner
window |
burned out solenoid
coil in the low fire oil valve |
|
A |
Modern day boiler
automation allows bypassing the "flame safeguard" system to permit
a burner to have a "trial for ignition" period during burner light
off. This period may not exceed __________. |
15 seconds |
30 seconds |
10 seconds |
5 seconds |
|
C |
Which of the following
statements represents the primary function of handholes used on a boiler? |
To allow access
into the steam and water drum. |
To provide access
for cleaning out the firebox. |
To allow access
into the headers. |
To allow access
for cleaning in the stack. |
|
C |
In what section
of a boiler would you find a steam quality of 90%? |
Last pass of the
superheater |
Superheater outlet |
Steam drum |
Desuperheater
outlet |
|
B |
Circulation of
water and the steam/water mixture within a natural circulation boiler is
retarded by __________. |
back pressure
in the steam drum acting on the user tubes |
fluid friction
in the downcomers, drums, generating tubes, and headers |
large changes
in steam density |
high feed water
pressure |
|
C |
Arrow "B"
shown in the illustration indicates the_________. Illustration SG-0008 |
retractable soot
blower opening |
uptakes |
combustion air
inlet |
regenerative air
heater |
|
B |
How is boiler
water forced to circulate faster in accelerated natural circulation boilers
as compared to free natural circulation boilers? |
Increasing the
density of the water. |
Increasing the
inclined angle of the generating tubes. |
Increasing the
surface area of the economizer exposed to the combustion gases. |
Installing a water
circulating pump, such as a hydrokineter. |
|
B |
Steam drum water
level indicators must be calibrated to compensate for density differences
between the indicated drum water level, and the actual drum water level.
If no compensation is made, the indicator will show a __________. |
lower level than
exists in the drum with the error becoming greater as the drum pressure
decreases |
lower level than
exists in the drum with the error becoming greater as the drum pressure
increases |
higher level than
exists in the drum with the error becoming greater as the drum pressure
decreases |
higher level than
exists in the drum with the error becoming greater as the drum pressure
increases |
|
B |
Reaching which
'end point' will result in the most severe damage to the boiler? |
Combustion |
Circulation |
Atomization |
Carryover |
|
A |
As compared with
a typical front fired boiler, which of the listed conditions represents
an advantage of a top fired boiler? |
More uniform heat
distribution and gas dwell is obtained within the furnace. |
No division tube
wall separating the convection and radiant sections of the furnace is ever
required. |
A lower fuel flow
rate can be allowed, thus increasing economy. |
Superheating diaphragms
may be omitted. |
|
A |
Most main propulsion
boilers are designed to produce. |
saturated and
superheated steam |
saturated steam
only |
superheated steam
only |
superheated and
supercritical steam |
|
B |
Overheating of
the generating tubes will occur when a boiler reaches its end point of __________. |
combustion |
circulation |
moisture carryover |
evaporation |
|
D |
The required number
of pounds of steam generated per hour to develop contract shaft horsepower
and maintain the specified pressures and temperatures in the plant, when
divided by the number of installed boilers, will give the __________. |
efficiency of
each fire room |
overload capacity
for each boiler |
efficiency of
each boiler |
full power capacity
of each boiler |
|
A |
A natural circulation
water-tube boiler, with one or more water drums, would be classified as
a/an. |
drum-type boiler |
accelerated natural
circulation boiler |
header-type boiler |
controlled circulation
boiler |
|
A |
On a boiler safety
valve, the blowdown adjusting ring is locked in place by a __________. |
set screw |
locknut |
wire seal |
cotter pin |
|
A |
One of the important
functions of the superheater safety valves is to __________. |
protect the superheater
from overheating |
maintain a constant
steam flow in the auxiliary steam line |
maintain a constant
steam flow in the desuperheater |
protect the desuperheater
from overheating |
|
D |
When excessive
static boiler pressure has resulted in the initial lift of the valve disc,
a huddling chamber safety valve will continue to lift open as a result of
___________, |
steam pressure
transmitted through a pipe connected to the superheater outlet |
an increase in
steam velocity through an adjustable orifice ring |
the resulting
reactive force created by the rapid expansion of escaping steam |
steam pressure
acting on the enlarged area of projecting lip or ring |
|
C |
Which of the listed
types of safety valves is shown in the illustration? Illustration SG-0018 |
Pressure-loaded
type |
Nozzle reaction
type |
Huddling chamber
type |
Jet flow type |
|
C |
A boiler safety
valve must be capable of __________. |
closing with a
chattering motion to free scale deposits from the seats |
remaining open
until all pressure in the steam drum is relieved |
remaining open
until a preset pressure drop occurs |
opening gradually
above a designated pressure |
|
C |
The primary operational
difference between a huddling chamber type safety valve and a nozzle reaction
type safety valve is the __________. |
manner in which
steam pressure causes initial valve opening |
difference in
valve relieving capacities |
principle by which
blow down is accomplished |
manner in which
lifting pressure is adjusted |
|
A |
The popping pressure
of the safety valve, shown in the illustration, is controlled by the __________.
Illustration SG-0018 |
amount of spring
compression |
feather guide
retaining ring |
adjusting ring
position |
seat bushing adjustment |
|
A |
A boiler accumulation
test is used to measure the __________. |
total relieving
capacity of the boiler safety valves |
steam generating
capacity of the boiler |
blow down pressure
of the boiler |
lifting pressure
of the boiler safety valves |
|
B |
Proper bracing
and support of the boiler safety valve escape piping is necessary to __________. |
prevent scale
from lodging on the valve seat |
prevent stressing
of the safety valves |
allow for back
pressure formation in the line |
prevent condensate
from accumulating in lines |
|
B |
On a boiler equipped
with pilot actuated safety valves, which of the valves listed will be actuated
first? |
Drum safety valve |
Pilot actuated
safety valve for the superheater safety valve |
Superheater safety
valve |
Pilot actuated
safety valve for the drum safety valve |
|
D |
The boiler shown
in the illustration, arrow "O" indicates the __________. Illustration
SG-0007 |
main generating
tubes |
superheater tubes |
screen tubes |
soot blower elements |
|
A |
The purpose of
the cam-actuated steam valve used in a boiler soot blower system is to __________. |
prevent steam
from entering the soot blower when the element holes are directed toward
the refractory |
rotate the element
through a predetermined blowing arc |
automatically
secure steam to the blower head any time the element stops turning |
automatically
blow the elements in the proper sequence |
|
D |
The purpose of
the pressure control disk installed in the multi-nozzle soot blower, as
shown in the illustration, is to __________. Illustration SG-0023 |
control the pressure
exerted on the valve spring retainer |
control the pressure
exerted on the steam valve disk when the cam secures the steam supply |
increase the pressure
in the steam supply line for proper soot blower operation |
reduce the steam
supply pressure to the soot blower element |
|
D |
The glass used
in a flat-type boiler water gage is protected from the hot steam and water
by a/an __________. |
asbestos gasket |
copper insulator |
felt cushion |
mica shield |
|
D |
Bi-color water
level indicators, connected directly to the boiler drum, operate on the
principle of __________. |
different chemical
properties of steam and water |
special insoluble
indicating fluids |
different densities
which result from the comparison of the varying steam pressure in the drum |
different refractive
properties of steam and water |
|
D |
The items labeled "D"
and "M" as indicated on the illustration are commonly called __________.
Illustration SG-0020 |
cork gaskets |
glass inserts |
face plates |
mica sheets |
|
A |
In a boiler water
gage glass, a ball check valve is installed on the __________. |
bottom connection
only |
top and bottom
connection |
top connection
only |
drain valve |
|
C |
The purpose of
the mica used in a boiler water gage glass assembly is to prevent __________. |
light refraction
in the glass |
leakage from the
glass |
etching of the
glass |
overheating of
the glass |
|
A |
The main steam
stop valve on a "D" type marine boiler is located at the __________. |
superheater outlet |
desuperheater
outlet |
desuperheater
inlet |
superheater inlet |
|
C |
A secondary function
of the refractory installed in a marine boiler is to __________. |
support the boiler
casing |
support the burner
distance piece |
direct the flow
of combustion gases |
maintain air flow
through the burner diffuser |
|
A |
Boiler refractories
previously baked out and fired are most sensitive to __________. |
rapid cooling |
sustained high
furnace temperature |
radiant heat of
the burner |
rapid heating |
|
B |
An advantage of
using boiler furnace studded water wall tubes packed with refractory is
that __________. |
thinner tubes
can be used |
the use of dense
firebricks is not required |
thicker tubes
are required |
lower quality
steel can be used |
|
C |
The useful life
of furnace refractory is affected most by __________. |
the quality of
the fuel being burned |
improper treatment
of boiler water |
large and rapid
changes in furnace temperature |
high steady steaming
boiler loads |
|
B |
A corbel is used
in a boiler furnace to __________. |
direct the flow
of gases |
protect the expansion
joints |
reduce gas turbulence |
contain the furnace
heat |
|
A |
Which of the listed
refractory materials is capable of providing structural stability? |
Firebrick |
Insulating brick |
Chrome castable |
Insulating block |
|
C |
According to the
illustration of a typical boiler furnace rear wall, which item number would
best represent "standard fire brick"? Illustration SG-0003 |
1 |
2 |
3 |
7 |
|
B |
When heated, brickwork
in a boiler is kept from buckling by the installation of __________. |
sliding saddles |
expansion joints |
insulating bricks |
insulating blocks |
|
A |
According to the
illustration of a typical boiler furnace rear wall, which item number would
best represent "insulating brick"? Illustration SG-0003 |
1 |
2 |
3 |
7 |
|
D |
Which of the following
statements represents the function of insulating brick? |
Acts as a gas-side
layer at high temperature areas in D-type boilers. |
Provides structural
stability. |
Provides the first
layer at the inside of inner casing. |
Acts as backup
insulation behind firebrick, plastic refractory, or castable refractory. |
|
B |
Which of the following
statements represents the advantage of using a small diameter boiler tube
over a larger diameter tube? |
Small diameter
tubes reduce the heating surface area. |
Small diameter
tubes reduce gas turbulence in the tube banks. |
Small diameter
tubes provide for greater heat transfer rates. |
Small diameter
tubes are less affected by the insulating properties of soot. |
|
A |
The advantage
of installing waterwall tubes in a boiler furnace is to __________. |
permit higher
combustion rates |
increase heat
transfer to the mud drum |
decrease the flow
of gases through the furnace |
increase the flow
of gases through the furnace |
|
B |
The component
lettered "J" shown in the illustration serves as a __________.
Illustration SG-0007 |
screen tube header |
side water wall
header |
support beam |
water drum |
|
A |
The boiler shown
in the illustration has its screen tubes connecting the steam drum and the
component labeled __________. Illustration SG-0008 |
I |
F |
G |
D |
|
C |
In most marine
boilers, the primary reason the first few rows of generating tubes, called
screen or furnace row tubes, are made larger in diameter than the rest of
the generating tubes is because __________. |
their main function
is to retard combustion gas flow for maximum heat transfer rates |
they must screen
the superheater from the direct radiant heat of the burners |
they require more
water flow since they are exposed to the greatest heat |
they must act
as downcomers to ensure proper circulation |
|
C |
In a D-type boiler,
which of the tubes listed would be located in the generating tube bank? |
Waterwalls |
Recirculating
tubes |
Superheater support
tubes |
Downcomer tubes |
|
A |
Which of the tube
types listed can be considered to serve as downcomers at low firing rates,
and as generating tubes at high firing rates on some boilers? |
Superheater support
tubes |
Water screen tubes |
Water wall tubes |
Riser tubes |
|
D |
In the boiler
shown in the illustration, the arrow "E" indicates a __________.
Illustration SG-0008 |
support tube |
recirculating
tube |
water wall tube |
downcomer |
|
B |
The device shown
in the illustration is a/an __________. Illustration SG-0013 |
air ejector |
desuperheater |
deaerator |
eductor |
|
D |
Desuperheated
steam can be found at the __________. |
high-pressure
turbine steam chest |
main steam stop |
generator steam
stop |
spray attemperator
outlet |
|
C |
Which of the following
locations could desuperheated steam be considered to occur? |
Spray attemperator |
Main engine extractions |
Both "A"
and "B" |
Neither "A"
nor "B" |
|
D |
The primary purpose
of a control desuperheater installed in the steam drum of a boiler is to
__________. |
regulate the temperature
of superheated steam by adding moisture |
assure a constant
volume of steam flow through the entire superheater under all load conditions |
regulate saturated
steam temperature through the desuperheater |
regulate the superheater
outlet temperature by cooling a portion of the superheated steam |
|
C |
That portion of
the steam drum, containing a manhole for internal access to the drum, for
the purpose of cleaning, inspecting, and carrying out repairs, is called
the __________. |
wrapper sheet |
tube sheet |
drumhead |
end plate |
|
B |
Which of the following
statements concerning boiler steam drum surface blow piping is correct? |
The centerline
of the pipe is normally situated at a distance from the bottom of the steam
drum equal to approximately one-fourth the diameter of the drum. |
Usually the surface
blow pipe is perforated with holes along its top surface; however, when
a scum pan is also employed, the holes are located along the bottom of the
pipe surface. |
To ensure adequate
blow down, the aggregate cross-sectional area of these perforated holes
must be equal to approximately twice the cross-sectional area of the pipe. |
All of the above. |
|
D |
The purpose of
the boiler drum air cock is to __________. |
admit air when
the boiler is being emptied |
permit escape
of air when the boiler is being filled |
permit escape
of air when steam is forming in the drum after lighting off |
All of the above. |
|
C |
Steam baffles
are used in the steam drum of a water-tube boiler to __________. |
extend the internal
feed pipe |
remove boiler
water dirt deposits |
reduce the possibility
of carryover |
support the drum
safety valve nozzles |
|
B |
The boiler wrapper
sheet, shown in the illustration, is indicated by arrow __________. Illustration
SG-0007 |
A |
B |
H |
I |
|
D |
The main purpose
of the boiler steam drum component shown in the illustration is to __________.
Illustration SG-0006 |
reduce vibration |
reduce the possibility
of priming |
permit expansion
during pressure surges |
prevent thermal
shock |
|
D |
Where is the 'dry
pipe' located in a boiler? |
At the superheater
outlet |
Behind the superheater
screen tubes |
Below the generation
tube bank |
In the top of
the steam drum |
|
A |
Which of the following
statements represents one operational characteristic of a cyclone steam
separator? |
Unit imparts a
rotational motion to the steam and water mixture. |
Steam is forced
to the outer side of the separator by centrifugal force. |
Unit reduces the
circulation of the steam and water mixture in the boiler. |
Water is forced
upward by centrifugal force. |
|
C |
A boiler internal
feed pipe is perforated to __________. |
reduce the weight
of the steam drum internals |
create a slight
turbulence in the steam drum |
distribute water
evenly throughout the steam drum |
provide positive
flow to the downcomers |
|
B |
Which of the devices
listed is indicated by arrow "H" shown in the illustration? Illustration
SG-0008 |
Overdeck superheater |
Economizer |
Air heater |
Steam soot blowers |
|
B |
Boiler fuel savings
gained by the use of an economizer can amount to __________. |
one-half percent
for each 15°F rise in feed water temperature |
one percent for
each 10°F rise in feed water temperature |
three percent
for each 5°F rise in feed water temperature |
three percent
for each 20°F rise in feed water temperature |
|
B |
Which of the conditions
listed could cause steam formation in the economizer? |
Soot buildup on
the gill rings. |
Sudden large increase
in the firing rate. |
Excessive water
flow rates. |
An open main feed
pump recirculating line. |
|
A |
The boiler economizer
provides additional heat to the __________. |
feed water entering
the boiler |
steam leaving
the superheater |
fuel oil entering
the furnace |
air supply entering
the furnace |
|
C |
A check valve
is located between the economizer and the steam drum to __________. |
assure a positive
feed water flow through the economizer |
prevent the feed
pump from becoming vapor bound |
prevent steam
and water flow reversal from the drum should an economizer casualty occur |
assure a positive
feed water flow to the steam drum |
|
B |
The minimum feedwater
inlet temperature to a boiler economizer is determined by the __________. |
superheater outlet
temperature |
dew point temperature
of the stack gas |
surface area of
the third stage heater |
radiant heat transfer
in the furnace |
|
D |
The turbo-generator
steam stop is located between the superheater outlet and the main steam
stop valve to __________. |
provide for easier
access |
provide higher
quality steam for the turbo-generators |
provide a flow
of cooling steam through the control desuperheater |
allow the use
of superheated steam in the turbo-generator without pressurizing the larger
main steam line |
|
A |
The main steam
stop bypass valve is used to __________. |
gradually increase
the pressure and temperature of the main steam piping when warming up |
supply auxiliary
steam when the main steam stop is closed |
isolate the main
steam stop for repairs while steaming |
cross-connect
two steaming boilers |
|
D |
Scavenging air
is supplied to steam sootblower elements to __________. |
prevent buildup
of soot on the element |
provide cooling
air when soot blower elements are rotating through blowing arcs |
prevent overheating
of adjacent tubing |
prevent back up
of combustion gases into soot blower heads |
|
D |
In a boiler equipped
with a convection type superheater, the superheater tubes are located __________. |
between the economizer
and generating tubes |
between the downtake
nipple and circulator tube |
in the path of
the radiant heat of combustion |
in a position
screened from the furnace |
|
D |
The boiler superheater
shown in the illustration is a/an __________. Illustration SG-0007 |
horizontal U-type |
overdeck convection-type |
overdeck integral-type |
vertical U-type |
|
C |
Which of the devices
listed is shown in the boiler illustration? Illustration SG-0008 |
Separately fired
superheater |
Regenerative air
heater |
Integral or interdeck
superheater |
Retractable soot
blower |
|
B |
Boiler superheaters
are designed to __________. |
raise the latent
heat of the steam |
raise the sensible
heat of the steam |
increase the overall
mechanical efficiency of the plant |
provide continuous
steam flow to the control desuperheater |
|
B |
Which of the types
of superheaters listed has the flattest superheat temperature curve? |
Convection |
Radiant-convection |
Radiant |
Conduction-convection |
|
A |
Where is the superheater
located in the boiler shown in the illustration? Illustration SG-0008 |
G |
H |
I |
J |
|
A |
In a regenerative
air heater, air is bypassed around the heater while __________. |
operating at low
steaming rates |
crossing over
forced draft fans |
giving a surface
blow |
blowing tubes |
|
C |
The bottom blow
valve on a water-tube boiler is usually attached to the __________. |
steam and water
drum |
external downcomers |
boiler mud drum |
floor tubes |
|
A |
When increasing
the firing rate of a boiler, which of the following should be carried out
FIRST? |
Increasing the
forced draft air pressure. |
Increasing the
fuel pressure. |
Increasing the
feed water flow. |
Decreasing the
steam pressure. |
|
A |
To safely decrease
the boiler firing rate, you should always reduce the fuel pressure __________. |
before reducing
the forced draft pressure |
after reducing
the forced draft pressure |
by opening the
oil recirculating valve |
by opening the
fuel pump relief valve |
|
B |
Which of the following
items should be checked each time the firing rate or forced draft pressure
is adjusted? |
Atomizing steam
pressure |
Smoke periscope |
Fuel oil suction
pressure |
Fuel oil heater
inlet temperature |
|
D |
As the percentage
of CO2 in the stack gas decreases, you can assume that __________. |
the fuel to air
ratio is increasing |
fuel is being
burned with increasing economy |
you are approaching
secondary combustion |
excess air is
increasing |
|
D |
One factor for
determining the minimum feedwater inlet temperature to a boiler economizer
is the __________. |
desuperheater
outlet temperature |
temperature of
steam bled off the LP turbine |
superheater inlet
temperature |
dew point temperature
of the stack gases |
|
B |
When answering
a full astern bell from half ahead, the superheater outlet temperature on
a single furnace boiler will __________. |
remain the same |
decrease due to
the increase steam volume used |
increase sharply
with the increased firing rate |
decrease momentarily
and then increase proportionately with load demand |
|
B |
If there is a
sudden drop in the outlet temperature of an uncontrolled superheater, you
should __________. |
increase the firing
rate |
check for high
water level in the drum |
bypass the air
heater |
reduce the forced
draft fan speed |
|
D |
Which of the valves
listed should be closed before lighting off a boiler? |
Superheater vent
valve |
Superheater drain
valve |
Air cock valve |
Economizer drain
valve |
|
A |
Which of the following
precautions should be taken prior to lighting off a boiler? |
Purge the furnace
of combustible gases. |
Bottom blow the
mud drum. |
Secure the main
steam line drains. |
Close the air
register. |
|
A |
Many steam plants
are designed so that diesel oil can be provided to the burners when __________. |
lighting off a
cold ship |
heavy smoking
persists |
overload capacity
is required |
a heavy fuel must
be blended |
|
A |
Steam assist fuel
atomizers are converted to straight mechanical atomizers in order to __________. |
cold start a boiler
with diesel oil |
raise steam on
the idle boiler |
meet minimum boiler
steam demands |
provide the best
fuel economy |
|
D |
The superheater
vents should always be open when __________. |
blowing down the
boiler |
the water level
is lower than normal |
blowing tubes |
lighting off the
boiler |
|
C |
Why should the
fuel oil be recirculated before lighting off a cold boiler? |
To allow the fuel
strainers to thoroughly clean the fuel. |
To allow fuel
pressure to buildup gradually. |
To heat the fuel
enough for proper atomization. |
To ensure that
all water is removed from the fuel. |
|
A |
Prior to lighting
a burner in a cold boiler, you should __________. |
thoroughly purge
the furnace |
open the surface
blow valve |
blow down the
mud drum |
close the superheater
vent |
|
D |
If a boiler is
brought on the line with its steam pressure much higher than that of the
boiler already on the line, there is danger of __________. |
low water |
an overloaded
superheater |
thermal shock |
priming and carryover |
|
B |
While raising
steam on a cold boiler, the air cock is to be closed after __________. |
the economizer
drain is closed |
steam has formed
and all air is vented |
the boiler is
cut in on the line |
all burners have
been lit and firing normally |
|
A |
When raising steam
on an idle boiler and the steam pressure has risen to about 5 pounds more
than the pressure of the boiler already on the line, you can __________. |
put the boiler
on the line |
close the superheater
vent |
increase the boiler
firing rate |
close the air
cock |
|
B |
The time taken
to raise steam on a cold boiler should always be. |
not less than
a full 24 hours |
the time specified
by the boiler manufacturer |
not more than
1 full hour |
as short as possible
to avoid excessive thermal expansion |
|
A |
When preparing
to cut a boiler in on the line, you determine that the steam pressure of
the incoming boiler is about 5 psig above line pressure. Which of the following
steps should you take next? |
Open the desuperheated
steam stop. |
Test the hand
relieving gear. |
Open the superheater
vent. |
Light off additional
burners. |
|
A |
After steam has
been raised and a boiler is being placed on the line, the superheater vent
can be closed when __________. |
the boiler is
supplying auxiliary steam |
the boiler steam
stops have been warmed up |
main and auxiliary
steam line drains are opened |
boiler pressure
is 5 psi above line pressure |
|
D |
When raising steam
on a boiler, the superheater drains should __________. |
be closed until
just before line pressure is reached, and then given a short blow period |
be opened to remove
condensate, and then closed when the first burner is lit |
be closed until
after the air cock is closed, and then opened until the boiler is placed
on line |
remain open or
partially open until steam blows through the lines, and then the valves
should be closed |
|
D |
When raising steam
on a cold boiler under normal conditions, you should always __________. |
use a large orifice
burner sprayer plate to start |
take 24 hours
to raise steam |
raise steam within
one hour or less |
use a small orifice
burner sprayer plate to start |
|
D |
Which of the following
statements about boilers is correct? |
The water level
in a properly operated boiler will not shrink or swell. |
No boiler will
continue to generate steam after the fires are secured. |
Loss of water
will not harm a boiler if the water level can be restored. |
A hot boiler will
continue to generate steam after the fires are secured. |
|
B |
When a boiler
has been secured and is being initially cooled, the water level showing
in the steam drum gage glass should be __________. |
allowed to drop
naturally |
maintained at
the normal level |
allowed to go
out of sight |
maintained at
a full glass |
|
D |
After a boiler
has been taken off the line and is cooling, the air cock is opened to __________. |
purge all air
from the steam drum |
guard against
entrapped gas pockets in the superheater |
allow even cooling
of the steam drum |
prevent the formation
of a vacuum within the boiler |
|
A |
Which of the valves
listed should be closed before lighting off a boiler? |
Economizer drain
valve |
Air cock valve |
Superheater vent
valve |
Superheater drain
valve |
|
B |
If a boiler is
brought on the line with its steam pressure much higher than that of the
boiler already on the line, there is danger of __________. |
low water |
priming and carryover |
an overloaded
superheater |
thermal shock |
|
D |
Which of the following
is the best reason for opening the air cock when draining a water-tube boiler? |
Water flows out
of the boiler too rapidly with the air cock closed. |
Air mixed with
the water will create a cleansing effect in the tubes. |
Air coming into
the boiler will help dry out the boiler's surface. |
With the air cock
open, the boiler drains without producing a vacuum. |
|
A |
A boiler is to
be secured in port. After the burners have been secured, the forced draft
fan and air registers should be secured __________. |
after any oil
on the furnace floor has been burned off and cleared of combustion gases |
after at least
1 hour has elapsed, after carrying out these securing procedures |
after 30 minutes
has elapsed, after carrying out these procedures |
immediately after
carrying out the former procedures |
|
C |
Which of the actions
listed should be carried out immediately after securing the fires in one
boiler of a two boiler ship? |
Open the air registers
wide to cool the furnace. |
Secure the main
feed pump. |
Relieve all fuel
oil service pressure to that boiler. |
Drain and refill
the boiler with cold water. |
|
C |
Before blowing
tubes in a boiler equipped with steam soot blowers, you should __________. |
decrease the boiler
water level |
lower the boiler
steam pressure |
increase the boiler
water level |
reduce the forced
draft fan speed |
|
D |
Before using a
boiler compressed air soot blower system, you should __________. |
decrease the forced
draft fan speed |
lower the water
level |
reduce the boiler
pressure |
drain the soot
blower pneumatic operating lines |
|
D |
To avoid acid
corrosion of the economizer tubes when blowing tubes. |
lower water level |
raise boiler pressure |
lower boiler pressure |
drain the soot
blowers headers |
|
D |
After routine
blowing of tubes at sea, there should be a decrease in the __________. |
CO2 in the stack
gas |
fuel oil temperature |
excess air required
for complete combustion |
stack temperature |
|
B |
When cleaning
the waterside of boiler tubes with a powered rotary brush, the brush should
be kept in motion to __________. |
reduce tube pitting |
avoid internal
tube damage |
reduce wear to
brush bristles |
prevent it from
seizing |
|
A |
If while filling
the boiler a newly installed gasket on a water-tube hand hole plate weeps,
you should __________. |
center and tighten
with correct size wrench |
coat the gasket
with graphite |
use a double gasket |
retighten the
stud nut with an air wrench |
|
D |
When a propulsion
boiler is removed from service for an extended period, why should the firesides
be thoroughly dried after water washing? |
Prevent flarebacks
on lighting off. |
Reduce the possibility
of thermal spalling. |
Prevent cracking
of the brickwork. |
Reduce the probability
of corrosion. |
|
A |
The correct method
of expanding a generating tube at the boiler drum tube sheet is to roll
__________. |
to a depth greater
than the thickness of the drum tube sheet |
slightly at the
tube end prior to welding the tube to the drum tube sheet |
to a depth less
than the thickness of the drum tube sheet |
heavily at the
tube end prior to welding the tube to the drum tube sheet |
|
C |
Which of the following
repairs should be made to a badly warped boiler tube? |
Assure that the
warped tube does not touch adjacent tubes and then reroll it in the header. |
Use a hydraulic
jack to cold bend the tube. |
Replace the tube
with a spare, if available, or plug it. |
Heat the tube
and use a soft mallet to straighten it. |
|
B |
A hole should
be made in the sagged tube occurring in a water-tube boiler, prior to plugging
the tube to prevent a __________. |
crack failure
of the tube |
pressure buildup
in the tube |
complete sagging
failure of the tube |
quick burnout
of the tube |
|
D |
To prevent a small
plastic refractory wall patch repair from falling into the furnace of a
D-type boiler, you should __________. |
mix the plastic
with concrete prior to using |
reinforce the
patch with fine mesh metal screen |
attach anchor
bolts to the furnace casing |
undercut the existing
brick around the area to be patched |
|
D |
When drying and
baking are impractical, or time is not available, which of the listed materials
could be used to repair both burner openings and gas baffles? |
Baffle mix |
Plastic chrome
ore |
Plastic fire clay |
High temperature
castable refractory |
|
B |
To make temporary
emergency repairs to brickwork in a boiler furnace, which of the materials
listed should be used? |
Calcined diatomaceous
earth |
Plastic refractory |
Insulating block |
Air setting mortar |
|
A |
Radial cracks
have developed in the castable refractory of the burner cones after the
first firing since the installation of new furnace front refractory. This
is an indication of __________. |
relieved stresses |
a need for castable
refractory patchwork |
inadequate cone
angle |
a need for plastic
firebrick patchwork |
|
B |
To assure a long
service life for boiler refractory materials after installation, the most
effective method is to __________. |
maintain a high
furnace temperature at all times |
avoid rapid temperature
changes and follow recommended operating procedures |
properly secure
refractory with anchor bolts |
patch refractory
with plastic chrome ore |
|
C |
When installing
new safety valve escape piping, precautions should include assuring that
__________. |
the piping leads
directly to the bilge |
the quick-closing
valve operates freely |
no stress is transmitted
to the valve |
bends or elbows
in the line do not exist |
|
B |
Improper water
washing of the water-tube boiler firesides can cause __________. |
erosion of tubes
and drums |
sulfuric acid
corrosion |
decreased heat
transfer capabilities |
loss of ductility
in boiler tubes |
|
C |
Which procedure
should be followed to dry out the fireside of a boiler after water washing? |
Place trays of
silica gel in the furnace. |
Use a wire reinforced
steam hose to put superheated steam in the furnace for 6 hours. |
Alternately fire
one burner for 15 minute intervals during a 5 hour period. |
Open the furnace
registers and run the forced draft fans for 3 hours. |
|
D |
The boiler water
gage glasses should be blown down __________. |
when the boiler
water level changes in a steaming boiler |
every 12 hours
of steady boiler steaming operation |
twice each day
on the midnight and afternoon watches |
when you are in
doubt about the water level |
|
B |
To properly blowdown
a boiler gage glass, you should __________. |
blow through the
top (steam) connection first |
blow through the
bottom (water) connection first |
take up snugly
on upper and lower gage glass packing nuts prior to blowing down |
never disconnect
the chains that connect the upper and lower cut out valves |
|
C |
In the absence
of the manufacturer's instructions, a good procedure in reassembling a high-pressure
boiler gage glass is to tighten the nuts in pairs and __________. |
begin with the
end bolts and work toward the center |
start at the top
and work down |
begin with the
center bolts and work toward the ends |
start at the bottom
and work up |
|
D |
You are standing
watch in the engine room of a steam vessel. You should blow down a gage
glass periodically to __________. |
maintain the proper
water level in the steam drum |
provide water
samples for the second assistant |
test the feed
water stop-check valve |
remove any sediment
that has accumulated |
|
C |
While your vessel
is underway at normal speed, a steam drum safety valve develops a significant
leak. Your first corrective action should be to __________. |
secure the boiler
and blank off the valve flange |
inspect the escape
piping for binding on the valve body |
attempt to reseat
the valve using the hand releasing gear |
secure the boiler
and check the valve spring compression |
|
D |
Lower than normal
steam pressure in an operating boiler may be caused by __________. |
boiler water contamination |
a sudden drop
in superheater outlet temperature |
high feed water
temperature |
a low water level
in the steam drum |
|
A |
Water in the fuel
supply to a steaming boiler can be detected by __________. |
sputtering of
the fires |
observation of
the fuel oil heater drains |
panting of the
casing |
dense white smoke
being observed in the periscope |
|
A |
Before an explosion
can occur in a boiler furnace, there must be an accumulation of unburned
fuel, sufficient air to form an explosive mixture, and a __________. |
source of ignition
for the explosive mixture |
space large enough
for the explosion to occur |
high steam demand
on the boiler |
ground in the
burner ignition electrode |
|
A |
What is the cause
of 'laning' in a boiler tube bank? |
Excessive slag
accumulation on the tubes |
Low fuel oil pressure |
Reduced furnace
volume |
Insufficient air
flow |
|
B |
Which color burner
flame would indicate too much excess air? |
Yellowish orange |
Incandescent white |
Orange red |
Bright red |
|
A |
Lower boiler efficiency
results from carrying too much excess air because __________. |
it increases the
volume and temperature of the furnace gas leaving the stack |
it decreases the
volatility of the fuel |
the flame temperatures
are lower |
it varies the
degree of deposits on heat absorbing surfaces |
|
C |
If the flue gas
oxygen content is too high, you should __________. |
increase the forced
draft fan speed |
increase the fuel
oil temperature |
adjust the combustion
control system |
adjust the fuel
oil service system |
|
A |
A higher than
normal stack gas temperature could indicate __________. |
dirty firesides
or watersides |
eroded water screen
tube walls |
inner or outer
casing leakage |
defects in burner
cone refractory |
|
B |
While the vessel
is rolling in heavy seas, the level in the boiler gage glass remains steady,
this is an indication that __________. |
the water level
in the steam drum is too low |
there is most
likely an obstruction in the lower valve |
the steam drum
is adequately baffled |
the gage glass
is functioning normally |
|
B |
Which of the following
actions, if any, should be taken if the water gage glass on a steaming boiler
breaks? |
Reduce the firing
rate. |
Close the gage
glass cutout valves. |
Close in on the
feed stop-check valve. |
No action is necessary
since checks in the cutout valves automatically seat to stop loss of steam
and water. |
|
D |
If the engineer
on watch has reason to doubt the accuracy of the water level shown in the
boiler gage glass, he should __________. |
speed up the main
feed pump |
open the auxiliary
feed line |
start the standby
feed pump |
blow down the
gage glass |
|
C |
An obstruction
in the top connection of a boiler gage glass will cause the __________. |
gage glass to
overheat and break |
gage glass to
be blown empty |
water level to
rise slowly in the glass |
water level to
remain constant in the glass |
|
C |
If the engineer
on watch has reason to doubt the accuracy of the water level showing in
the boiler gage glass, he should FIRST __________. |
start the standby
feed pump |
open the auxiliary
feed line |
blow down the
gage glass |
replace the gage
glass |
|
D |
Boiler tube failures
can result from __________. |
mechanical stress |
overheating |
corrosion |
All of the above. |
|
A |
Why are hard scale
deposits on the inside of boiler tubes most objectionable? |
Poor heat transfer
due to hard scale deposits overheats tubes. |
Flow of water
within the tube is restricted. |
Hydroxyl ions
liberated by the scaling process form acid in the boiler water. |
The metal of the
tube interior is eaten away by scale. |
|
D |
The MOST common
cause of heat blisters developing on boiler generating tubes is due to__________. |
flame impingement |
gas laning |
insufficient water
circulation |
waterside deposits |
|
B |
Oil or scale deposits
on boiler tube walls will cause __________. |
decreased boiler
steam pressure |
those tubes to
overheat |
increased boiler
steam pressure |
an explosion in
the boiler |
|
C |
If a boiler tube
bank baffle carries away, or burns through, there will be __________. |
fireside burning
of boiler tubes |
excessive gas
turbulence in the furnace |
localized overheating
of the water drum |
incomplete combustion |
|
D |
Excessive foaming
in a steaming boiler can cause damage to the __________. |
internal feed
pipe |
economizer |
desuperheater |
superheater |
|
A |
In a boiler equipped
with an automatic feed water regulator, erratic variations in the water
level could be caused by __________. |
high solids content
and foaming in the drum |
high feed water
temperature |
ruptured feed
water control valve diaphragm |
low feed water
temperature |
|
C |
Oil accumulation
in boiler water would __________. |
increase the heat
transfer rate |
practically eliminate
boiler sludge formation |
cause foaming
and carryover from the boiler |
prevent acid attack
on the boiler tubes |
|
C |
Damaging scale
can form on the interior of superheater tubes as a result of __________. |
high superheater
outlet temperature |
insufficient steam
flow through the superheater |
boiler water carryover |
leaks from the
desuperheater |
|
D |
Under otherwise
normal steaming conditions, an abnormally high temperature at the superheater
outlet of a single furnace boiler would indicate. |
high steam demand |
insufficient combustion
air |
excessive steam
supply to fuel oil heaters |
poor heat transfer
in feed water heaters |
|
C |
A heavy accumulation
of soot on the fireside of the superheater can cause a __________. |
high superheater
outlet temperature because of gas laning |
high superheater
outlet temperature because of reduced steam flow |
low superheater
outlet temperature because of the insulating effect of soot |
high superheater
inlet temperature because of decreased heat transfer |
|
C |
Insufficient combustion
air supply to the furnace would cause __________. |
high feed water
consumption |
the fires to sputter |
low superheater
outlet temperature |
high stack temperature |
|
D |
If a pressure
drop does not exist across the superheater in a steaming boiler __________. |
the feed water
temperature is too low |
this is a normal
condition |
the drum safety
valve is about to lift ahead of the superheater safety |
there is no steam
flow through the superheater |
|
B |
Which of the listed
conditions can cause high superheater outlet steam temperature in an automated
boiler? |
Insufficient excess
air. |
Operating with
a bypassed economizer. |
Excessive heat
transfer in the control desuperheater. |
High water level
in the steam drum. |
|
B |
Slag buildup on
boiler furnace refractory is undesirable because it causes __________. |
fracturing of
the anchor bolts |
peeling or spalling
of the brickwork |
excessive cooling
of the brickwork |
shrinking of the
brickwork |
|
D |
Which of the following
conditions is indicated by an external bulge or bowed area of the boiler
furnace wall? |
The brickwork
has become slagged. |
The insulation
block has become slagged. |
The corbels have
failed. |
The furnace brickwork
has collapsed in that area. |
|
A |
Which of the following
problems can occur when an excessive number of water screen tubes are plugged? |
Superheater outlet
temperature will rise. |
Steam pressure
leaving the drum will increase. |
Superheater outlet
pressure will rise. |
Steam temperature
in the drum will decrease. |
|
A |
Which of the conditions
listed occurs when glassy slag, formed by the burning of fuel oil contaminated
with salt water, melts and runs over the furnace wall? |
Damage to the
furnace refractory. |
Cracks through
the furnace floor. |
Increased furnace
temperature. |
Formation of a
protective coating. |
|
C |
Which of the following
would indicate a moderate leak in the desuperheater? |
Lower than normal
fuel oil consumption |
Higher than normal
fuel oil consumption |
Lower than normal
auxiliary steam temperature |
Higher than normal
auxiliary steam pressure |
|
B |
Which of the conditions
listed could cause a boiler economizer to leak? |
Low feed water
pressure. |
Water hammer. |
High feed water
temperatures. |
High stack gas
temperatures. |
|
B |
Which of the conditions
listed would indicate excessive soot buildup on the economizer? |
Low air temperature
entering the boiler |
High superheater
temperature |
Lower than usual
air pressure in the furnace |
High feed water
temperature entering the boiler |
|
A |
If a soot blower
element does not revolve freely, the most likely cause would be __________. |
warpage of the
soot blower element |
an improper blowing
arc cam setting |
insufficient steam
pressure to the soot blower element |
a seized blower
head bearing |
|
C |
A nozzle reaction
safety valve will lift at a pressure lower than required if the __________. |
nozzle ring has
come adrift |
adjusting ring
is set too low |
spring compression
is insufficient |
blow down is set
too low |
|
C |
If it should become
necessary to abandon a compartment because of the danger of a large steam
leak on a boiler, which of the following actions represents the best avenue
of escape? |
Escape through
another compartment on a higher level. |
Use fire room
elevator to an upper deck. |
Escape through
another compartment on a lower level. |
Escape by way
of a fire room ladder to the outer deck. |
|
B |
Which of the precautions
listed should be taken when gagging a boiler safety valve? |
Tighten the gag
only with the special wrench supplied with the gag. |
Tighten the gag
only finger tight to prevent damage to the valve stem, disc or seat. |
Ensure that all
moving parts of the safety valve are free to move before installing the
gag. |
Do not allow the
gag to contact the safety valve stem. |
|
A |
Which of the listed
operating practices is considered as safe, and should be followed when opening
and inspecting the waterside of a boiler? |
Wire all valves
closed that connect to other boilers. |
Open the water
drum manhole before opening the steam drum manhole. |
Ventilate the
waterside until completely dry. |
Remove handhole
plate dogs with a slugging wrench. |
|
C |
If a major flareback
occurs to a boiler, which of the following actions should be immediately
taken? |
Secure all fire
room ventilation. |
Secure the forced
draft fan. |
Secure the fuel
to the burners. |
Purge the fuel
oil system. |
|
A |
If the water level
in one boiler of a two boiler plant rapidly falls out of sight, which of
the following actions should be carried out FIRST? |
Secure the fuel
oil to that boiler. |
Secure the steam
stop to that boiler. |
Blow down the
gage glass. |
Raise the feed
pump pressure. |
|
D |
Which of the following
actions should be carried out if the boiler water level is falling due to
a tube failure? |
Open the auxiliary
feed stop and check for extra feed. |
Speed up the feed
pump to keep the water level up while firing the boiler. |
Start the standby
feed pump and feed the boiler using two feed pumps. |
Secure the fires
and try to maintain the water level. |
|
A |
Which action should
be taken if the water level in the boiler gage glass drops out of sight
and the burners fail to secure automatically? |
Trip the master
solenoid. |
Repair the feed
water regulator. |
Increase the feed
pump speed. |
Blow down the
gage glass. |
|
C |
After restoring
the normal water level in a boiler following a high-water casualty, you
should __________. |
immediately drain
the economizer |
immediately put
the boiler on the line |
completely drain
the superheater |
blow down the
water gage glass |
|
A |
Under EMERGENCY
operating conditions, the proper valve positions for controlling feedwater
to the boiler should be the __________. |
auxiliary stop
valve fully open and the auxiliary stop-check valve used to regulate the
amount of flow |
auxiliary stop
and stop-check valves fully open and the feed pump speed used to regulate
the amount of flow |
auxiliary stop-check
valve fully open and the auxiliary stop valve used to regulate the amount
of flow |
auxiliary stop-check
valve fully open and the auxiliary stop valve regulated by the feed water
regulator |
|
D |
In the event of
a failure of the pneumatic control system, a multi-element feedwater regulator
is designed to operate as a __________. |
constant-volume
feed water regulator |
constant-pressure
regulator |
thermo-hydraulic
feed water regulator |
manually controlled
feed water regulator |
|
A |
One boiler of
a two boiler plant has ruptured a tube and the water cannot be maintained
in sight in the gage glass. After securing the fires, your next action should
be to __________. |
secure the feed
water supply to the boiler |
close the main
steam stop |
secure the forced
draft fans |
stop the fuel
oil service pump |
|
C |
The boiler wrapper
sheet, shown in the illustration, is indicated by arrow __________. Illustration
SG-0007 |
A |
H |
B |
I |
|
A |
In what section
of a boiler would you find a steam quality of 90%? |
Steam drum |
Desuperheater
outlet |
Superheater outlet |
Last pass of the
superheater |
|
A |
Steam baffles
are used in the steam drum of a water-tube boiler to __________. |
reduce the possibility
of carryover |
support the drum
safety valve nozzles |
remove boiler
water dirt deposits |
extend the internal
feed pipe |
|
A |
The internal feed
pipe in a D-type marine boiler __________. |
distributes feed
water evenly throughout the steam drum |
is drilled with
holes to provide even distribution of boiler feed water chemicals |
is located well
above the normal steam drum water level to assist in deaeration of feed
water |
guides the feed
water toward the downcomer tubes |
|
C |
Which of the following
statements represents the purpose of boiler sliding feet? |
To ensure an airtight
seal between the boiler inner and outer casings.
o |
To compensate
for deflection of the hull in way of the boiler supports. |
To accommodate
the changing length of the water drum as it expands or contracts with temperature
changes. |
To allow for unequal
expansion between the wrapper and tube sheets. |
|
D |
Which area shown
in the illustration will offer the most resistance to heat transfer from
the fireside to the waterside of a boiler tube? Illustration SG-0017 |
D |
E |
C |
B |
|
C |
Under what operating
conditions may water wall header drains be used for blow down? |
When it is necessary
for rapid drainage of the boiler. |
During periods
of carryover in the steam drum. |
Only if the fires
are secured and no steam is being generated. |
When the water
level is out of sight in the gage glass. |
|
C |
In the boiler
shown in the illustration, the arrow "E" indicates a __________.
Illustration SG-0008 |
support tube |
recirculating
tube |
downcomer |
water wall tube |
|
A |
One advantage
of installing water wall tubes in a boiler furnace is to __________. |
decrease refractory
maintenance |
reduce combustion
rates |
increase furnace
size |
reduce furnace
temperature |
|
A |
In most marine
boilers, the primary reason the first few rows of generating tubes, called
screen or furnace row tubes, are made larger in diameter than the rest of
the generating tubes is because __________. |
they require more
water flow since they are exposed to the greatest heat |
they must screen
the superheater from the direct radiant heat of the burners |
they must act
as downcomers to ensure proper circulation |
their main function
is to retard combustion gas flow for maximum heat transfer rates |
|
D |
The boiler superheater
shown in the illustration is a/an __________. Illustration SG-0007 |
overdeck convection-type |
overdeck integral-type |
horizontal U-type |
vertical U-type |
|
D |
Where is the superheater
located in the boiler shown in the illustration? Illustration SG-0008 |
I |
J |
H |
G |
|
B |
The purpose of
the division plates installed in boiler superheater headers is to __________. |
limit the maximum
temperature rise of the superheater outlet to 15°F |
ensure proper
steam flow, thus preventing 'short circuiting' of superheater loops |
provide a means
of controlling steam passage in response to throttle demands |
All of the above. |
|
D |
Which of the devices
listed is shown in the boiler illustration? Illustration SG-0008 |
Regenerative air
heater |
Separately fired
superheater |
Retractable soot
blower |
Integral or interdeck
superheater |
|
A |
The items labeled "D"
and "M" as indicated on the illustration are commonly called __________.
Illustration SG-0020 |
mica sheets |
glass inserts |
cork gaskets |
face plates |
|
B |
The device shown
in the illustration is a/an __________. Illustration SG-0013 |
deaerator |
desuperheater |
eductor |
air ejector |
|
C |
Desuperheated
steam can be found at the __________. |
main steam stop |
generator steam
stop |
spray attemperator
outlet |
high pressure
turbine steam chest |
|
C |
Which of the following
locations could desuperheated steam be considered to occur? |
Spray attemperator |
Main engine extractions |
Both "A"
and "B" |
Neither "A"
nor "B" |
|
A |
The primary purpose
of a control desuperheater installed in the steam drum of a boiler is to
__________. |
regulate the superheater
outlet temperature by cooling a portion of the superheated steam |
regulate saturated
steam temperature through the desuperheater |
regulate the temperature
of superheated steam by adding moisture |
assure a constant
volume of steam flow through the entire superheater under all load conditions |
|
A |
Which of the devices
listed is indicated by arrow "H" shown in the illustration? Illustration
SG-0008 |
Economizer |
Steam soot blowers |
Overdeck superheater |
Air heater |
|
B |
The minimum feedwater
inlet temperature to a boiler economizer is determined by the __________. |
radiant heat transfer
in the furnace |
dew point temperature
of the stack gas |
superheater outlet
temperature |
surface area of
the third stage heater |
|
C |
Boiler fuel savings
gained by the use of an economizer can amount to __________. |
one half percent
for each 15°F rise in feed water temperature |
three percent
for each 5°F rise in feed water temperature |
one percent for
each 10°F rise in feed water temperature |
three percent
for each 20°F rise in feed water temperature |
|
D |
Which of the conditions
listed could cause steam formation in the economizer? |
Soot buildup on
the gill rings. |
An open main feed
pump recirculating line. |
Excessive water
flow rates. |
Sudden large increase
in the firing rate. |
|
D |
The boiler economizer
provides additional heat to the __________. |
steam leaving
the superheater |
air supply entering
the furnace |
fuel oil entering
the furnace |
feed water entering
the boiler |
|
A |
A check valve
is located between the economizer and the steam drum to __________. |
prevent steam
and water flow reversal from the drum should an economizer casualty occur |
assure a positive
feed water flow to the steam drum |
prevent the feed
pump from becoming vapor bound |
assure a positive
feed water flow through the economizer |
|
B |
One factor for
determining the minimum feedwater inlet temperature to a boiler economizer
is the __________. |
superheater inlet
temperature |
dew point temperature
of the stack gases |
temperature of
steam bled off the LP turbine |
desuperheater
outlet temperature |
|
D |
Which of the listed
refractory materials can be used in an area directly exposed to the highest
heat in the furnace? |
Baffle mix |
Insulating block |
Insulating brick |
Firebrick |
|
A |
In a regenerative
air heater, air is bypassed around the heater while __________. |
operating at low
steaming rates |
giving a surface
blow |
blowing tubes |
crossing over
forced draft fans |
|
C |
When heated, brickwork
in a boiler is kept from buckling by the installation of __________. |
insulating bricks |
insulating blocks |
expansion joints |
sliding saddles |
|
A |
Which of the listed
refractory materials is composed of wool fibers and clay binders? |
Insulating cement |
Castable fireclay |
Chrome castable
ore |
All of the above. |
|
D |
According to the
illustration of a typical boiler furnace rear wall, which item number would
best represent "insulating block"? Illustration SG-0003 |
3 |
1 |
2 |
7 |
|
A |
Boiler refractory
firebrick is secured to the casing by __________. |
slots in the brick
engaging anchor bolts |
fast drying plastic
refractory mortar |
high strength
tensile fasteners |
studding on the
water wall tubes |
|
D |
Boiler refractory
previously baked out and fired is most sensitive to __________. |
radiant heat of
the burner |
rapid heating |
sustained high
furnace temperature |
rapid cooling |
|
A |
Which of the listed
types of safety valves is shown in the illustration? Illustration SG-0018 |
Huddling chamber
type |
Pressure-loaded
type |
Jet flow type |
Nozzle reaction
type |
|
C |
On a boiler safety
valve, the blowdown adjusting ring is locked in place by a __________. |
wire seal |
locknut |
set screw |
cotter pin |
|
A |
What is the primary
operational difference between a nozzle reaction safety valve and a huddling
chamber safety valve? |
The principle
by which blow down is accomplished. |
The manner in
which lifting pressure is adjusted. |
The difference
in valve relieving capacities. |
The manner in
which steam pressure causes initial valve opening. |
|
A |
When excessive
static boiler pressure has resulted in the initial lift of the valve disc,
a huddling chamber safety valve will continue to lift open as a result of
___________, |
steam pressure
acting on the enlarged area of projecting lip or ring |
the resulting
reactive force created by the rapid expansion of escaping steam |
an increase in
steam velocity through an adjustable orifice ring |
steam pressure
transmitted through a pipe connected to the superheater outlet |
|
A |
Scavenging air
lines are connected to boiler stack periscopes to __________. |
prevent stack
gases from contaminating the periscopes internal components |
maintain a negative
pressure in the periscope line |
keep the mirrors
from misaligning |
keep the periscope
tubing from warping |
|
D |
Which type of
waterside deposits can normally be removed by chemically boiling out a boiler? |
Sludge |
High temperature
oxide |
Corrosion deposits |
Oil |
|
D |
Steam line water
hammer can be best prevented by __________. |
always opening
steam valves rapidly |
replacing all
90°Elbows with capped tees |
keeping steam
temperature below the saturation point |
keeping lines
drained and insulated |
|
C |
A water-tube boiler
can be laid up either wet or dry. If it is to be laid up wet, you should
__________. |
drain and refill
the boiler when the pH goes above 6 |
drain and refill
the boiler each week |
completely fill
the boiler with deaerated feed water and maintain a slight pressure |
completely fill
the boiler with water, then blow down to steaming level |
|
B |
Which of the methods
listed would be most effective in repairing a steam cut on a seating surface
of a superheater handhole plate? |
Filling the cut
with iron cement or plastic steel. |
Filling the cut
by welding and then grinding it smooth. |
Refacing the surface
and over torquing the handhole plate. |
Grinding the seating
surface and installing an oversized gasket. |
|
B |
Which of the tools
listed is used to remove a boiler tube from a header? |
Swaging tool |
Backing out tool |
Laminating tool |
Expanding tool |
|
A |
When you are installing
a new furnace floor in an oil fired boiler, the clearance between the firebricks
should be large enough to __________. |
allow for expansion
without subjecting the joint to flame penetration |
facilitate rebricking
at required maintenance intervals |
allow for installation
of plastic chrome ore after drying |
allow for proper
filling with slag under normal operating conditions |
|
A |
Which of the listed
procedures is the most important factor to take into consideration when
making repairs to the refractory surrounding the burner openings? |
Design refractory
cone angle must be maintained. |
All cracks must
be completely filled. |
Plastic firebrick
must be used. |
Finished repair
surfaces must be smooth. |
|
C |
A furnace wall
in which there are open spaces around the brick as a result of firebrick
shrinkage, is __________. |
spalled and must
be replaced |
normal and need
only be cleaned |
loose and should
be repaired |
cracked and must
be patched |
|
B |
Which of the listed
refractory materials should be used for patching a burner front formed of
plastic, castable, or tile? |
Air-setting mortar |
Plastic fireclay |
Chrome castable
insulation |
Plastic chrome
insulation |
|
D |
After patching
refractory with plastic firebrick, holes are poked in the patch on 1 1/2
inch centers in order to __________. |
allow for expansion |
prevent slag buildup |
prevent spalling |
vent escaping
moisture |
|
C |
To assure a long
service life for boiler refractory materials after installation, the most
effective method is to __________. |
patch refractory
with plastic chrome ore |
properly secure
refractory with anchor bolts |
avoid rapid temperature
changes and follow recommended operating procedures |
maintain a high
furnace temperature at all times |
|
A |
When installed,
the economizer relief valve should always be set __________. |
50 pounds higher
than the drum safety valve plus the water pressure drop through the economizer |
50 pounds higher
than the superheater safety valve plus the water pressure drop through the
economizer |
at the same pressure
as the superheater safety valve |
at the same pressure
as the drum safety valve |
|
D |
When water washing
a boiler, the proper sequence for washing the sections should be the __________. |
generating tubes,
superheater, and then economizer |
screen tubes,
generating tubes, and then superheater |
superheater, economizer,
and then generating tubes |
economizer, superheater,
generating, and then screen tubes |
|
D |
Which of the listed
mediums should be used when water washing a boiler? |
Cold freshwater |
Cold saltwater |
Heated saltwater |
Heated freshwater |
|
B |
According to the
data given in the illustration, which of the following would be the physical
state of the fluid at a gage vacuum of 25.03 inches Hg, and 126.08 degrees
Fahrenheit? Illustration SG-0026 |
Superheated vapor. |
Sub cooled liquid. |
Mixture of saturated
liquid and vapor. |
Saturated liquid. |
|
B |
If the saturation
pressure of water is increased, the relative values shown on the illustrated
graph of SG-0001 will change. According to pertinent information found in
the steam tables of SG-0004, this will result in __________. Illustration
SG-0001 Illustration SG-0004 |
no change to the
length of line 4 |
a decrease the
length of line 4 |
no change in the
height of line 4 |
a decrease in
the height of line 4 |
|
B |
Which of the following
statements is true concerning the information tabulated in the table? Illustration
SG-0004 |
At 185.3 psig
(1366.4 kPa), the saturation temperature of a mixture of water and steam
is 377.51°F (192°C). |
When one pound
of water changes to one pound of steam at 200 psia (1378.8 kPa), its volume
increases 124.41 times. |
If one pound of
steam at 250 psia (1723.5 kPa) condenses to one pound of water it will give
up 843 BTU's (889.4 kJ) while changing state. |
All of the above. |
|
D |
According to the
data given in illustration, which of the following would be the physical
state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees
Fahrenheit? Illustration SG-0026 |
Mixture of saturated
liquid and vapor. |
Sub cooled liquid. |
Saturated liquid. |
Superheated vapor. |
|
A |
If a boiler generates
saturated steam at 125.3 psig, how much heat is required to change the water
into steam if the feed water temperature is 240°F? Illustration SG-0004 |
983.4 Btu/lb |
582.7 Btu/lb |
30.5 Btu/lb |
116.5 Btu/lb |
|
C |
What physical
changes will occur to the steam within a boiler that has been properly bottled
up when additional heat is applied? |
The pressure will
increase and the volume will remain constant. |
The steam pressure
and it specific volume will remain constant. |
The pressure will
increase and the specific volume will decrease. |
The pressure will
remain constant and the specific volume will increase. |
|
C |
The major heat
loss in an oil fired boiler is the heat __________. |
required to change
water into steam |
passing through
the boiler casing |
going up the stack |
used in the economizer
and air heater |
|
A |
A lower than normal
boiler stack gas temperature usually indicates __________. |
incomplete combustion |
dirty watersides |
dirty firesides |
fuel high sulfur
content |
|
D |
A high carbon
monoxide content in the flue gases of a boiler indicates __________. |
complete combustion |
a high carbon
content fuel |
too much excess
air |
incomplete combustion |
|
A |
When the rate
of heat transfer through tube walls is so reduced that the metal becomes
overheated, which of the following conditions will result in the boiler? |
Fireside burning |
Fireside thinning |
Steam gouging |
Steam binding |
|
A |
Cratering and
water tracking in boiler tubes is caused by __________. |
water trapped
between tubes and refractory |
burning a fuel
with a high vanadium content |
soot corrosion |
baked on slag
deposits |
|
D |
The formation
of a pit in the surface of a boiler tube is most likely to occur when __________. |
dissolved minerals
are present |
waterside deposits
are present |
sludge is present |
the tube metal
acts as an anode |
|
C |
In a water-tube
boiler, waterside scale formation is caused by __________. |
sodium hydroxide |
sodium phosphate |
calcium sulfate |
magnesium phosphate |
|
B |
Blisters developing
on boiler tubes can be caused by __________. |
hot feed water |
waterside scale
deposits |
cold feed water |
air in the feed
water |
|
A |
Waterside abrasion
of boiler tubes can be caused by __________. |
mechanical tube
cleaning |
oxygen corrosion |
improper bends
in the tubes |
entrained impurities
in the boiler water |
|
C |
Fireside burning
of boiler tubes is usually the direct result of __________. |
gas laning in
tube banks |
oxygen corrosion
of metallic surfaces |
overheating due
to poor heat transfer |
high furnace temperatures |
|
D |
Boiler tube failures
can result from __________. |
corrosion |
overheating |
mechanical stress |
All of the above. |
|
B |
Warping of superheater
screen tubes can be caused by __________. |
high superheater
temperatures |
sudden cooling
of tubes after being overheated |
high furnace temperatures |
installing baffles
of excessive length |
|
C |
An excessively
high superheater temperature could be the result of __________. |
soot accumulation
on the superheater |
high feed water
temperature |
excessive air |
excessive steam
demand |
|
D |
When operating
under constant load, the superheated steam temperature may rise above normal
if the __________. |
excess air is
too low |
feed water temperature
is too high |
boiler is priming |
feed water temperature
is too low |
|
A |
Under normal operating
conditions, a drop in the steam temperature leaving an uncontrolled interdeck
superheater could be caused by a __________. |
decrease in combustion
gas velocity through the superheater |
badly fouled economizer |
decrease in steam
velocity through the superheater |
drop in the feed
water temperature |
|
C |
Insufficient combustion
air supply to the furnace would cause __________. |
high feed water
consumption |
high stack temperature |
low superheater
outlet temperature |
the fires to sputter |
|
A |
Dirty generating
tube surfaces may cause higher than normal superheater outlet temperatures
because __________. |
the boiler must
be over fired to maintain the required rate of steam generation |
the screen tubes
absorb excessive heat and transfer the increased temperature to the superheater |
the temperature
of the gas leaving the generating banks will be lower than normal |
gas laning will
result causing overheating of the superheater |
|
B |
Which of the following
would indicate a moderate leak in the desuperheater? |
Higher than normal
auxiliary steam pressure |
Lower than normal
auxiliary steam temperature |
Higher than normal
fuel oil consumption |
Lower than normal
fuel oil consumption |
|
C |
Which of the conditions
listed could cause a boiler economizer to leak? |
High stack gas
temperatures. |
High feed water
temperatures. |
Water hammer. |
Low feed water
pressure. |
|
B |
Which of the conditions
listed would indicate excessive soot buildup on the economizer? |
High feed water
temperature entering the boiler |
High superheater
temperature |
Lower than usual
air pressure in the furnace |
Low air temperature
entering the boiler |
|
C |
Slag buildup on
boiler furnace refractory is undesirable because it causes __________. |
shrinking of the
brickwork |
excessive cooling
of the brickwork |
peeling or spalling
of the brickwork |
fracturing of
the anchor bolts |
|
A |
Which of the following
conditions is indicated by an external bulge or bowed area of the boiler
furnace wall? |
The furnace brickwork
has collapsed in that area. |
The insulation
block has become slagged. |
The corbels have
failed. |
The brickwork
has become slagged. |
|
D |
Which of the following
problems can occur when an excessive number of water screen tubes are plugged? |
Steam temperature
in the drum will decrease. |
Superheater outlet
pressure will rise. |
Steam pressure
leaving the drum will increase. |
Superheater outlet
temperature will rise. |
|
D |
Which of the conditions
listed occurs when glassy slag, formed by the burning of fuel oil contaminated
with salt water, melts and runs over the furnace wall? |
Formation of a
protective coating. |
Cracks through
the furnace floor. |
Increased furnace
temperature. |
Damage to the
furnace refractory. |
|
A |
Excessive foaming
in a steaming boiler can cause damage to the __________. |
superheater |
internal feed
pipe |
desuperheater |
economizer |
|
A |
In a boiler equipped
with an automatic feed water regulator, erratic variations in the water
level could be caused by __________. |
high solids content
and foaming in the drum |
ruptured feed
water control valve diaphragm |
high feed water
temperature |
low feed water
temperature |
|
C |
Rapid fluctuation
in the superheater temperature of a steady steaming boiler indicates __________. |
improper positioning
of superheater fires |
leaky superheater
tubes |
moisture carryover |
leaky desuperheater
tubes |
|
A |
Oil accumulation
in boiler water would __________. |
cause foaming
and carryover from the boiler |
prevent acid attack
on the boiler tubes |
practically eliminate
boiler sludge formation |
increase the heat
transfer rate |
|
C |
High boiler water
level can cause carryover and __________. |
warped screen
tubes |
warped water wall
tubes |
damage to the
superheater tubes |
damage to the
economizer |
|
A |
Which of the precautions
listed should be taken when gagging a boiler safety valve? |
Tighten the gag
only finger tight to prevent damage to the valve stem, disc or seat. |
Tighten the gag
only with the special wrench supplied with the gag. |
Do not allow the
gag to contact the safety valve stem. |
Ensure that all
moving parts of the safety valve are free to move before installing the
gag. |
|
C |
Which of the listed
operating practices is considered as safe, and should be followed when opening
and inspecting the waterside of a boiler? |
Ventilate the
waterside until completely dry. |
Open the water
drum manhole before opening the steam drum manhole. |
Wire all valves
closed that connect to other boilers. |
Remove handhole
plate dogs with a slugging wrench. |
|
D |
If it should become
necessary to abandon a compartment because of the danger of a large steam
leak on a boiler, which of the following actions represents the best avenue
of escape? |
Escape through
another compartment on a higher level. |
Escape by way
of a fire room ladder to the outer deck. |
Use fire room
elevator to an upper deck. |
Escape through
another compartment on a lower level. |
|
B |
While underway,
the boiler water level in a steaming boiler begins dropping rapidly and
cannot be kept at the normal level by standard practices. The engineer's
next action should be to __________. |
blow down the
gage glass to find the true water level |
secure the fires
and then secure the main feed stop/check valve to the boiler |
continue to speed
up the feed pump to raise the water level |
secure the steam
stop and then secure the fires |
|
B |
Which of the casualties
listed is apt to occur immediately after a high water casualty? |
Excessive steam
pressure |
Water carryover
to the turbines |
Excessive superheater
temperature |
Massive tube failure |
|
B |
Which action should
be taken if the water level in the boiler gage glass drops out of sight
and the burners fail to secure automatically? |
Repair the feed
water regulator. |
Trip the master
solenoid. |
Blow down the
gage glass. |
Increase the feed
pump speed. |
|
C |
Which of the following
actions should be carried out if the boiler water level is falling due to
a tube failure? |
Start the standby
feed pump and feed the boiler using two feed pumps. |
Open the auxiliary
feed stop and check for extra feed. |
Secure the fires
and try to maintain the water level. |
Speed up the feed
pump to keep the water level up while firing the boiler. |
|
D |
If a major flareback
occurs to a boiler, which of the following actions should be immediately
taken? |
Purge the fuel
oil system. |
Secure all fire
room ventilation. |
Secure the forced
draft fan. |
Secure the fuel
to the burners. |
|
A |
Under EMERGENCY
operating conditions, the proper valve positions for controlling feedwater
to the boiler should be the __________. |
auxiliary stop
valve fully open and the auxiliary stop-check valve used to regulate the
amount of flow |
auxiliary stop
and stop-check valves fully open and the feed pump speed used to regulate
the amount of flow |
auxiliary stop-check
valve fully open and the auxiliary stop valve regulated by the feed water
regulator |
auxiliary stop-check
valve fully open and the auxiliary stop valve used to regulate the amount
of flow |
|
A |
In the event of
a failure of the pneumatic control system, a multi-element feedwater regulator
is designed to operate as a __________. |
manually controlled
feed water regulator |
constant-pressure
regulator |
thermo-hydraulic
feed water regulator |
constant-volume
feed water regulator |
|
A |
One boiler of
a two boiler plant has ruptured a tube and the water cannot be maintained
in sight in the gage glass. After securing the fires, your next action should
be to __________. |
secure the feed
water supply to the boiler |
close the main
steam stop |
secure the forced
draft fans |
stop the fuel
oil service pump |
|
C |
The phrase 'boiler
water column' as defined in the regulations, refers to the __________. |
pressure gauge
reading in feet of water |
pressure head
to the feed water pump suction |
water level indicator |
vertical water
leg |
|
D |
When two or more
boilers provide steam flow to a common main steam line, each boiler main
steam line shall be fitted with a main steam stop valve and a/an. |
auxiliary steam
stop valve |
gate valve |
swing check valve |
stop-check valve |
|
B |
When preparing
to hydrostatically test water-tube boilers, you should __________. |
remove all inspection
plates and manhole covers as required by the marine inspector |
fill the boiler
with water not less than 70°F (21.1°C), nor more than 160°F (71.1°C) |
make arrangements
for simultaneously testing main and auxiliary steam stops with water and
steam pressure |
have the boiler
warmed to a temperature not exceeding 100°F (37.8°C) |
|
B |
Which of the following
statements is true concerning boiler inspections? |
At the first inspection
for certification after a water-tube boiler has been installed for ten years,
it shall be gauged by drilling to determine the actual extent of deterioration. |
The marine inspector
may require any boiler to be drilled to determine its actual thickness any
time its safety is in doubt. |
If the thickness
found as a result of gauging is less than original thickness, the boiler
must be condemned. |
Any user of a
nondestructive testing device must demonstrate that results with an accuracy
of plus or minus one percent are consistently obtainable. |
|
C |
According to 46
CFR Part 61, which of the following statements is true concerning the inspection
of water-tube boilers? |
Boiler mountings
attached to boiler nozzles must be opened and removed for examination every
8 years. |
All mountings
shall be opened up and examined by a Coast Guard inspector at eight year
intervals after the initial inspection. |
Boiler mountings
attached directly to the boiler plating by screwed studs and nuts shall
be removed and examined every 10 years. |
All boiler mounting
studs or bolts shall be removed for examination by a Coast Guard inspector
every 4 years after initial inspection. |
|
A |
Which of the following
statements represents the Coast Guard Regulation regarding a boiler installation
in which the superheater outlet temperature exceeds 850°F? |
Visible and audible
alarms indicating excessive superheat shall be provided. |
A device, actuated
by inlet static pressure and designed to function by the bursting of a pressure
retaining disk, must be fitted at the outlet of the superheater. |
All mountings,
fittings, valves, or other superheater attachments must be of malleable
cast iron. |
Safety valves
are to be set at 110% of the highest setting of the safety valves on the
drum. |
|
A |
Which of the Coast
Guard publications listed contain the information regarding allowable repairs
to boilers installed on cargo vessels? |
Marine Engineering
Regulations |
Rules and Regulations
for Cargo and Miscellaneous Vessels |
Modern Marine
Engineer's Manual |
Manufacturer's
Instruction Manual |
|
D |
According to Coast
Guard Regulations (46 CFR), which of the following is classified as a boiler
mounting? |
Main feed check
valve |
Soot blower element |
Escape piping
drain valve |
Blow-off valve |
|
B |
Coast Guard Regulations
(46 CFR) state that main propulsion water-tube boilers are not required
to be fitted with a surface blow off valve if the design pressure is __________. |
300 psig (2169
kPa) or over |
350 psig (2413
kPa) or over |
500 psig (3548
kPa) or over |
550 psig (3893
kPa) or over |
|
D |
Coast Guard Regulations
(46 CFR Part 5 permit copper pipe to be used for steam service subjected
to a maximum pressure and temperature of. |
350 psi and 460°F |
350 psi and 406°F |
250 psi and 460°F |
250 psi and 406°F |
|
D |
Coast Guard Regulations
(46 CFR) regarding hydrostatic testing of main steam piping state that __________. |
the hydrostatic
test pressure must be maintained on the piping for a minimum of one hour |
a pipe with a
nominal size of six inches or more is not required to be hydrostatically
tested |
not less than
fifty percent of the lagging shall be removed each time the hydrostatic
test is applied |
the hydrostatic
test shall be applied from the boiler drum to the throttle valve |
|
B |
According to Coast
Guard Regulations (46 CFR), which of the following steam piping conditions,
subjected to main boiler pressure, is exempted from hydrostatic testing? |
All piping to
the ship's service generators. |
All piping with
a nominal size of 3 inches or less. |
All piping from
the main steam stop to the throttle valve. |
All piping equipped
with a safety or relief valve. |
|
A |
If the maximum
steam generating capacity of a boiler is increased Coast Guard Regulations
(46 CFR) require that the safety valve's __________. |
relieving capacity
be checked |
reseating pressure
be increased |
blow down be reduced |
lifting pressure
be increased |
|
D |
Coast Guard Regulations
(46 CFR) permit repairs and adjustments to boiler safety valves while installed
on a main propulsion boiler and may be made by __________. |
any competent
person on the ship |
only the safety
valve manufacturer |
an approved repair
facility only |
the chief engineer
in an emergency |
|
C |
Coast Guard Regulations,
46 CFR Part 54, require steam safety and relief valves to be provided with
a substantial lifting device, capable of lifting the disc from its seat
at what percentage of the set pressure? |
0 (%) |
25 (%) |
75 (%) |
90 (%) |
|
B |
Coast Guard Regulations
(46 CFR) require that the final setting of boiler safety valves be conducted
in presence of the __________. |
COTP |
marine inspector |
chief engineer |
OCMI |
|
B |
The MAWP of a
boiler is 900 psi and the normal drop across the superheater is 20 psi.
If the superheater safety valve is set to lift at 825 psi, the minimum settings
of the drum safety valves allowed by Coast Guard Regulations would be. |
825 psi |
850 psi |
875 psi |
900 psi |
|
D |
A boiler superheater
safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations
(46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across
the superheater, the drum safety valve should set to lift at a pressure
of __________. |
450 psi (3102
kPa) |
455 psi (3137
kPa) |
460 psi (3171
kPa) |
465 psi (3206
kPa) |
|
D |
The safety valve
nominal size for propulsion boilers and superheaters must be not less than
1 1/2 inches and not more than 4 inches. The term 'nominal size' refers
to the |
free spring length |
diameter of the
feather |
diameter of the
huddling chamber |
diameter of the
inlet opening |
|
B |
Coast Guard Regulations
(46 CFR) concerning superheater safety valves require that the valve. |
is not set at
a pressure less than the feed pump relief valve |
nominal size is
not less than 1.5 inches nor more than 4 inches |
be set at a pressure
higher than the drum safety valves |
can only be operated
by a pilot valve |
|
B |
Coast Guard Regulations
(46 CFR) concerning marine boilers, require the installation of a safety
valve on the __________. |
preheated steam
outlet |
superheated steam
outlet |
desuperheated
steam outlet |
auxiliary steam
outlet |
|
B |
Coast Guard regulations
require that the relieving capacity of boiler safety valves must be checked
__________. |
when repairs have
been made to the safety valves |
when the generating
capacity of the boiler is increased |
at least once
every 4 years |
at least once
a year |
|
B |
Coast Guard Regulations
(46 CFR) require the duplex fuel oil discharge strainers installed in boiler
fuel oil service systems to be __________. |
enclosed in a
drip-proof vented enclosure to reduce the possibility of fire |
located so as
to preclude the possibility of spraying oil on the burner or boiler casing |
as close to the
fuel oil service manifold as practicable |
a positive venting
system that will return any vapors to the pump suction |
|
D |
Coast Guard Regulations
(46 CFR Part 5 require that new fuel oil service piping between pumps and
burners be subjected to __________. |
a hydrostatic
leak test to the design pressure specified by the Coast Guard |
a hydrostatic
test of 1.25 times the maximum allowable pressure with the relief valves
closed |
spot radiographic
examination of portions of the finished weld joints |
a hydrostatic
test of 1.5 times the maximum allowable pressure but not less than 500 psi
(3447 kPa) |
|
A |
Coast Guard Regulations
(46 CFR) require that quick-closing valves on a fuel oil service system
should be installed as close as is practicable to the __________. |
boiler front fuel
oil header |
fuel oil settling
tanks |
fuel oil service
heaters |
suction side of
the fuel oil pump |
|
D |
In accordance
with Coast Guard Regulations (46 CFR) all fuel oil service piping in the
vicinity of the burners must __________. |
utilize leak proof
gaskets in all joints |
have all joints
seal welded |
be provided with
coamings or drip pans |
have wrap around
deflectors on all bolted flanged joints |
|
B |
Coast Guard Regulations
(46 CFR) for boiler fuel oil service systems require __________. |
all piping between
service pumps and burner fronts to be located below the floor plates to
eliminate fire hazards |
machinery driving
fuel oil service pumps to be fitted with remote controls so that they may
be stopped in the event of a fire |
fuel oil service
tanks to overhang boilers to utilize heat radiated from the boilers for
greater efficiency |
fuel oil heaters
for boilers burning fuels with low viscosity |
|
A |
According to Coast
Guard Regulations (46 CFR), which of the following is permitted in boiler
fuel oil service system discharge piping? |
Screwed bonnet
valves of the union bonnet type. |
Pipe unions one
inch or greater in diameter. |
Street ells made
of carbon steel. |
Bushings made
of seamless steel. |
|
B |
Coast Guard Regulations
(46 CFR) require that the design pressure of an economizer integral with
the boiler and connected to the boiler drum without intervening stop valves
shall be at least equal to __________. |
the feed pump
shut off head pressure |
110% of the drum
safety valves highest set pressure |
125% of the boiler
hydrostatic test pressure |
150% of the boiler
design test pressure |
|
C |
When a boiler
economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR)
require which of the following devices to be installed? |
A stop-check valve
is to be located at the economizer inlet. |
An emergency drain
line must be provided to the reserve feed tank. |
A stop-check valve
is to be located at the economizer outlet. |
A sentinel valve
is to be fitted on the superheater outlet. |
|
C |
According to Coast
Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves,
or have other suitable means employed to reduce the effects of temperature
differentials on all boilers designed for operating pressures of. |
250 psig (1825
kPa) or over |
300 psig (2169
kPa) or over |
400 psig (2859
kPa) or over |
600 psig (4238
kPa) or over |
|
D |
When preparing
to hydrostatically test water-tube boilers, you should __________. |
remove all inspection
plates and manhole covers as required by the marine inspector |
make arrangements
for simultaneously testing main and auxiliary steam stops with water and
steam pressure |
have the boiler
warmed to a temperature not exceeding 100°F (37.8°C) |
fill the boiler
with water not less than 70°F (21.1°C), nor more than 160°F (71.1°C) |
|
B |
Which of the following
statements is true concerning boiler inspections? |
If the thickness
found as a result of gauging is less than original thickness, the boiler
must be condemned. |
The marine inspector
may require any boiler to be drilled to determine its actual thickness any
time its safety is in doubt. |
At the first inspection
for certification after a water-tube boiler has been installed for ten years,
it shall be gauged by drilling to determine the actual extent of deterioration. |
Any user of a
nondestructive testing device must demonstrate that results with an accuracy
of plus or minus one percent are consistently obtainable. |
|
C |
According to 46
CFR Part 61, which of the following statements is true concerning the inspection
of water-tube boilers? |
All boiler mounting
studs or bolts shall be removed for examination by a Coast Guard inspector
every 4 years after initial inspection.
o |
Boiler mountings
attached to boiler nozzles must be opened and removed for examination every
8 years. |
Boiler mountings
attached directly to the boiler plating by screwed studs and nuts shall
be removed and examined every 10 years. |
All mountings
shall be opened up and examined by a Coast Guard inspector at eight year
intervals after the initial inspection. |
|
B |
Which of the following
statements represents the Coast Guard Regulation regarding a boiler installation
in which the superheater outlet temperature exceeds 850°F? |
All mountings,
fittings, valves, or other superheater attachments must be of malleable
cast
iron. |
Visible and audible
alarms indicating excessive superheat shall be provided. |
Safety valves
are to be set at 110% of the highest setting of the safety valves on the
drum. |
A device, actuated
by inlet static pressure and designed to function by the bursting of a pressure
retaining disk, must be fitted at the outlet of the superheater. |
|
A |
Which of the Coast
Guard publications listed contain the information regarding allowable repairs
to boilers installed on cargo vessels? |
Marine Engineering
Regulations |
Rules and Regulations
for Cargo and Miscellaneous Vessels |
Manufacturer's
Instruction Manual |
Modern Marine
Engineer's Manual |
|
C |
According to Coast
Guard Regulations (46 CFR), which of the following is classified as a boiler
mounting? |
Escape piping
drain valve |
Main feed check
valve |
Blow off valve |
Soot blower element |
|
D |
Coast Guard Regulations
(46 CFR) state that main propulsion water-tube boilers are not required
to be fitted with a surface blow off valve if the design pressure is __________. |
300 psig (2169
kPa) or over |
550 psig (3893
kPa) or over |
500 psig (3548
kPa) or over |
350 psig (2413
kPa) or over |
|
C |
Coast Guard Regulations
(46 CFR Part 56) permit copper pipe to be used for steam service subjected
to a maximum pressure and temperature of __________. |
350 psi and 460°F |
350 psi and 406°F |
250 psi and 406°F |
250 psi and 460°F |
|
A |
Coast Guard Regulations
(46 CFR) regarding hydrostatic testing of main steam piping state that __________. |
the hydrostatic
test shall be applied from the boiler drum to the throttle valve |
the hydrostatic
test pressure must be maintained on the piping for a minimum of one hour |
not less than
fifty percent of the lagging shall be removed each time the hydrostatic
test is applied |
a pipe with a
nominal size of six inches or more is not required to be hydrostatically
tested |
|
B |
According to Coast
Guard Regulations (46 CFR), which of the following steam piping conditions,
subjected to main boiler pressure, is exempted from hydrostatic testing? |
All piping equipped
with a safety or relief valve. |
All piping with
a nominal size of 3 inches or less. |
All piping to
the ship's service generators. |
All piping from
the main steam stop to the throttle valve. |
|
C |
If the maximum
steam generating capacity of a boiler is increased Coast Guard Regulations
(46 CFR) require that the safety valve's __________. |
lifting pressure
be increased |
blow down be reduced |
relieving capacity
be checked |
reseating pressure
be increased |
|
A |
Coast Guard Regulations
(46 CFR) permit repairs and adjustments to boiler safety valves while installed
on a main propulsion boiler and may be made by __________. |
the chief engineer
in an emergency |
any competent
person on the ship |
only the safety
valve manufacturer |
an approved repair
facility only |
|
C |
Coast Guard Regulations,
46 CFR Part 54, require steam safety and relief valves to be provided with
a substantial lifting device, capable of lifting the disc from its seat
at what percentage of the set pressure? |
0 (%) |
90 (%) |
75 (%) |
25 (%) |
|
D |
Coast Guard Regulations
(46 CFR) require that the final setting of boiler safety valves be conducted
in presence of the __________. |
Chief Engineer |
OCMI |
COTP |
Marine Inspector |
|
C |
The MAWP of a
boiler is 900 psi and the normal drop across the superheater is 20 psi.
If the superheater safety valve is set to lift at 825 psi, the minimum settings
of the drum safety valves allowed by Coast Guard Regulations would be __________. |
875 psi |
900 psi |
850 psi |
825 psi |
|
C |
A boiler superheater
safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations
(46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across
the superheater, the drum safety valve should set to lift at a pressure
of __________. |
450 psi (3102
kPa) |
455 psi (3137
kPa) |
465 psi (3206
kPa) |
460 psi (3171
kPa) |
|
B |
The safety valve
nominal size for propulsion boilers and superheaters must be not less than
1 1/2 inches and not more than 4 inches. The term 'nominal size' refers
to the __________. |
free spring length |
diameter of the
inlet opening |
diameter of the
huddling chamber |
diameter of the
feather |
|
C |
Coast Guard Regulations
(46 CFR) concerning superheater safety valves require that the valve __________. |
is not set at
a pressure less than the feed pump relief valve |
can only be operated
by a pilot valve |
nominal size is
not less than 1.5 inches nor more than 4 inches |
be set at a pressure
higher than the drum safety valves |
|
A |
Coast Guard Regulations
(46 CFR) concerning marine boilers, require the installation of a safety
valve on the __________. |
superheated steam
outlet |
desuperheated
steam outlet |
preheated steam
outlet |
auxiliary steam
outlet |
|
D |
Coast Guard regulations
require that the relieving capacity of boiler safety valves must be checked
__________. |
at least once
every 4 years |
at least once
a year |
when repairs have
been made to the safety valves |
when the generating
capacity of the boiler is increased |
|
D |
Coast Guard Regulations
(46 CFR) require the duplex fuel oil discharge strainers installed in boiler
fuel oil service systems to be __________. |
as close to the
fuel oil service manifold as practicable |
enclosed in a
drip-proof vented enclosure to reduce the possibility of fire |
a positive venting
system that will return any vapors to the pump suction |
located so as
to preclude the possibility of spraying oil on the burner or boiler casing |
|
C |
Coast Guard Regulations
(46 CFR Part 56) require that new fuel oil service piping between pumps
and burners be subjected to __________. |
spot radiographic
examination of portions of the finished weld joints
o |
a hydrostatic
leak test to the design pressure specified by the Coast Guard |
a hydrostatic
test of 1.5 times the maximum allowable pressure but not less than 500 psi
(3447 kPa) |
a hydrostatic
test of 1.25 times the maximum allowable pressure with the relief valves
closed |
|
B |
Coast Guard Regulations
(46 CFR) require that quick-closing valves on a fuel oil service system
should be installed as close as is practicable to the __________. |
fuel oil settling
tanks |
boiler front fuel
oil header |
suction side of
the fuel oil pump |
fuel oil service
heaters |
|
A |
In accordance
with Coast Guard Regulations (46 CFR) all fuel oil service piping in the
vicinity of the burners must __________. |
have wrap around
deflectors on all bolted flanged joints |
have all joints
seal welded |
utilize leak proof
gaskets in all joints |
be provided with
coamings or drip pans |
|
B |
Coast Guard Regulations
(46 CFR) for boiler fuel oil service systems require __________. |
fuel oil service
tanks to overhang boilers to utilize heat radiated from the boilers for
greater efficiency |
machinery driving
fuel oil service pumps to be fitted with remote controls so that they may
be stopped in the event of a fire |
fuel oil heaters
for boilers burning fuels with low viscosity |
all piping between
service pumps and burner fronts to be located below the floor plates to
eliminate fire hazards |
|
D |
According to Coast
Guard Regulations (46 CFR), which of the following is permitted in boiler
fuel oil service system discharge piping? |
Pipe unions one
inch or greater in diameter. |
Street ells made
of carbon steel. |
Bushings made
of seamless steel. |
Screwed bonnet
valves of the union bonnet type. |
|
B |
All oil-fired
main propulsion burners with automatic safety control systems must automatically
close the burner valve when __________. |
the burner is
properly seated |
actuated by a
boiler safety trip |
starting "trial
for ignition" |
the flame in boiler
furnace is confirmed |
|
C |
Coast Guard Regulations
(46 CFR) require that the design pressure of an economizer integral with
the boiler and connected to the boiler drum without intervening stop valves
shall be at least equal to __________. |
125% of the boiler
hydrostatic test pressure |
150% of the boiler
design test pressure |
110% of the drum
safety valves highest set pressure |
the feed pump
shut off head pressure |
|
A |
When a boiler
economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR)
require which of the following devices to be installed? |
A stop check valve
is to be located at the economizer outlet. |
A sentinel valve
is to be fitted on the superheater outlet. |
A stop check valve
is to be located at the economizer inlet. |
An emergency drain
line must be provided to the reserve feed tank. |
|
A |
According to Coast
Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves,
or have other suitable means employed to reduce the effects of temperature
differentials on all boilers designed for operating pressures of __________. |
400 psig (2859
kPa) or over |
250 psig (1825
kPa) or over |
600 psig (4238
kPa) or over |
300 psig (2169
kPa) or over |
|
C |
If a quantity
of saturated steam consists of 90 percent steam and 10 percent moisture,
the quality of the mixture is __________. |
10 (%) |
80 (%) |
90 (%) |
100 (%) |
|
D |
If a boiler generates
saturated steam at 125.3 psig, how much heat is required to change the water
into steam if the feed water temperature is 240°F? Illustration SG-0004 |
30.5 Btu/lb |
116.5 Btu/lb |
582.7 Btu/lb |
983.4 Btu/lb |
|
C |
The best conductor
of heat in a marine boiler is __________. |
water |
brick |
steel |
steam |
|
C |
At a given pressure,
erosion of steam piping and machinery will be minimized by utilizing __________. |
saturated steam |
desuperheated
vapor |
superheated steam |
wet steam |
|
C |
Which type of
energy conversion is associated with an operating steam boiler? |
Mechanical |
Specific |
Thermal |
Kinetic |
|
C |
Most marine boilers
are designed to produce __________. |
saturated steam
only |
superheated steam
only |
saturated and
superheated steam |
superheated and
supercritical steam |
|
C |
Which of the following
statements describes the effects that dissolved oxygen has on boiler internal
surfaces with changes in temperature and pressure? |
It increases the
corrosive effect with lowered pressure and increases its corrosive effect
with increased temperature. |
It decreases the
corrosive effect when both pressure and temperature are increased. |
It increases the
corrosive effect with increased pressure and decreases its corrosive effect
with increased temperature. |
Temperature and
pressure have no effect on the corrosive effect of dissolved oxygen. |
|
A |
Which of the stated
pressure conditions identifies the boiler design pressure? |
The pressure specified
by the manufacturer as a criterion for boiler design. |
The pressure at
which a boiler is operated during overload conditions. |
The same pressure
as the boiler operating pressure at full power capacity. |
A pressure lower
than boiler operating pressure. |
|
B |
Which of the following
conditions must exist before the superheating of saturated steam can occur
in a steam propulsion boiler? |
The firing rate
of the boiler must be increased. |
The steam must
be directed to an area separate from the steam drum. |
The flow of feed
water to the boiler must be increased. |
The economizer
must be on line. |
|
B |
The greatest deterrent
to heat transfer from the fireside to the waterside of a boiler is __________. |
water film |
gas film |
water eddies |
gas eddies |
|
C |
With an increase
in the saturation pressure of a fluid, the value represented by line "5"
on the graph will __________. Illustration SG-0001 |
increase the number
of BTU's per pound, per change in degree of temperature |
decrease the number
of BTU's per pound, per change in degree of temperature |
remain virtually
the same |
represent an increase
in the latent heat of condensation |
|
C |
With reference
to the chart, if a boiler generates saturated steam at 385.3 psig, how much
heat per pound was required to change the water into steam if the feed water
temperature was initially 104.5°C? Illustration SG-0004 |
96.85 BTU |
97.15 BTU |
1016.40 BTU |
1196.45 BTU |
|
C |
According to the
data given in illustration, which of the following would be the physical
state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees
Fahrenheit? Illustration SG-0026 |
Sub cooled liquid. |
Saturated liquid. |
Superheated vapor. |
Mixture of saturated
liquid and vapor. |
|
C |
According to the
data given in the illustration, which of the following would be the physical
state of the fluid at a gage vacuum of 29.00 inches Hg, and 85.21 degrees
Fahrenheit? Illustration SG-0026 |
Sub cooled liquid. |
Saturated liquid. |
Superheated vapor. |
Mixture of saturated
liquid and vapor. |
|
D |
Assume that steam
has formed in a boiler in which all of the steam stop valves are closed,
and the water level is held constant. When there is an increase in the temperature
of the steam and water in the boiler, which of the following effects will
occur on the pressure and the specific volume of the steam? |
The steam pressure
and volume will remain constant. |
The pressure will
increase and the volume will remain constant. |
The pressure will
remain constant and the volume will increase. |
The pressure will
increase and the specific volume will decrease. |
|
A |
Steam tables can
be used to obtain the __________. |
values for properties
of water and steam vapor at various conditions |
mechanical efficiency
of the main unit |
steam generating
capacity of a vessel's boilers |
specific fuel
consumption under steady steaming conditions |
|
C |
From which of
the areas listed are condensate drains normally collected and returned to
the low-pressure drain system? |
Steam systems
operating in excess of 150 psi |
Steam whistle
separator/trap |
Main and auxiliary
air ejector after condensers |
Each main feed
pump steam supply line |
|
C |
A basic comparison
can be made between a low pressure evaporator operation and a main condenser
with regards to the removal of non-condensable gases. The vacuum drag line
for the main condenser is specifically connected in which area? |
hot well |
steam lane |
air cooler section |
main tube bank |
|
A |
Which of the listed
systems would be a potential source for the high pressure drain system? |
Steam systems
operating in excess of 150 psi |
Galley steam tables |
Laundry steam
pressing machines |
Fuel oil tank
heating coils |
|
B |
High pressure
steam drains are normally discharged to the __________. |
drain and inspection
tank |
DC heater |
reserve feed tank |
atmospheric drain
line |
