Download 3RD CLASS STATIONARY STEAM ENGINEER LICENSE PREP ACTUAL FINAL EXAM 2025 and more Exams Nursing in PDF only on Docsity!
3RD CLASS STATIONARY STEAM ENGINEER
LICENSE PREP ACTUAL FINAL EXAM 2025 WITH
WELL RESEARCHED QUESTIONS AND CORRECT
VERIFIED ANSWERS ALREADY RATED 5 STARS
AND AGRADED
_________ are necessary for complete combustion - CORRECT ANSWER >>> time,
temperature, mixture, and atomization
if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ - CORRECT
ANSWER >>> 214.
a boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and closes at 398 PSI. The
blowdown is______psi - CORRECT ANSWER >>> 12
an oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-
generator - CORRECT ANSWER >>> steam turbine
a boiler is producing 40,000lb of steam/hr at a pressure of 100 PSI and a steam temperature of
500 degrees Fahrenheit. The steam produced is _______ steam - CORRECT ANSWER
>>> superheated
the economizer on a boiler is used to _______ - CORRECT ANSWER >>> add heat to the
feed water
blowers are normally used with________ boilers - CORRECT ANSWER >>> water tube
overheating of tubes on a boiler can be caused by________ - CORRECT ANSWER
>>> scale on tubes
carbon dioxide in a condensate return system causes_________ - CORRECT ANSWER
>>> channeling
a ________ pump is a positive displacement pump - CORRECT ANSWER >>> reciprocating
a boiler generating 6000 lb of steam/hr produces _______btu/hr - CORRECT ANSWER
a bottom blowdown is performed on a boiler to _____ - CORRECT ANSWER >>> discharge
sludge and sediment
water columns are connected to the boiler with a minimum of _______" pipe - CORRECT
ANSWER >>> 1
the minimum size of a water column blowdown valve is_______". - CORRECT ANSWER
the maximum size bottom blowdown valve on a boiler is_________". - CORRECT
ANSWER >>> 2 1/
a ________ allows condensate to pass through, but stops Steam. - CORRECT ANSWER
>>> a steam trap
the boiling point of water will____ with an increase in pressure - CORRECT ANSWER
>>> be raised
if a lather is not obtained when performing a soap hardness test, the water sample is_______ -
CORRECT ANSWER >>> hard
combustion efficiency can be increased when air is________ - CORRECT ANSWER
>>> preheated
______ draft is produced by a fan located between the boiler and the chimney - CORRECT
ANSWER >>> induced
the overspeed trip on a steam turbine should be tested ______ - CORRECT ANSWER
>>> before putting the steam turbine on-line
a high CO2 reading in the gases of combustion is a sign of____ - CORRECT ANSWER
>>> High combustion efficiency
the purpose of chemically treating feedwater is to________ - CORRECT ANSWER >>> turn
scale-forming salts to a non adhering sludge water in a d rating feed water heater is prevented from entering the steam line by a(n) _______.
- CORRECT ANSWER >>> Loop seal or internal overflow
a steam turbine operating at 3600 RPM will trip at_________ rpm - CORRECT ANSWER
he steam line going to The Blowers is connected to the main ________ - CORRECT
ANSWER >>> steam drum
before using blowers on a boiler,________ - CORRECT ANSWER >>> drain set blower lines
an accumulation of snow on the Fireside of a boiler tubes________ - CORRECT ANSWER
>>> decreases boiler efficiency
a globe valve installed in the feed water line between the feed water pump and boiler has a
pressure from the feed water pump_________ the valve disc - CORRECT ANSWER
>>> under
the range of a pressure gauge should be twice the safety valve setting, but not less than______
time (s) the safety valve setting - CORRECT ANSWER >>> 1 1/
hard scale formed on the inside of tubes is best removed by________ - CORRECT
ANSWER >>> air- or water-driven turbines
to correct a low water condition,_____ - CORRECT ANSWER >>> secure fires
desuperheater drain is used to_______ - CORRECT ANSWER >>> establish steam flow
a sudden rise in chimney temperature with no increase in load indicates______ - CORRECT
ANSWER >>> there is a broken baffle
the btu content of natural gas is_____ - CORRECT ANSWER >>> 100,000 btu/therm
a scotch Marine boiler is easily identified because it_____ - CORRECT ANSWER >>> has a
cylindrical internal furnace
the air flow switch at the burner fan housing________ - CORRECT ANSWER >>> and
shows the primary air fan is functioning the asme code recommends that low water fuel cutoff switch be tested by an evaporation
test__________ - CORRECT ANSWER >>> monthly
a neutral solution is_______ on the pH scale - CORRECT ANSWER >>> 7
a dry pipe separator _____ - CORRECT ANSWER >>> delivers higher-quality steam to the
header
draft is carefully controlled to_____ - CORRECT ANSWER >>> completely burn fuel
supplied to the burner
draft is measured with a_________ - CORRECT ANSWER >>> manometer
a ringelmann test is used to determine_______ - CORRECT ANSWER >>> smoke density
a flame scanner proves (verifies) __________ - CORRECT ANSWER >>> pilot in Maine
Flame
according to the asme code, when warming up a boiler the air cock is closed when_______ -
CORRECT ANSWER >>> the steam pressure gauge reads 25 psi
a motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity -
CORRECT ANSWER >>> 80
a deposit of scale or mud in an HRT boiler could cause_____ - CORRECT ANSWER >>> a
bag to develop
water wall tubes protect the refractory and_____ - CORRECT ANSWER >>> increase boiler
heating surface
steam at E250 psia and 400 degrees Fahrenheit is considered______ Steam - CORRECT
ANSWER >>> saturated
sensible heat is heat that_____ - CORRECT ANSWER >>> changes a substances
temperature but not its state extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______ psi
- CORRECT ANSWER >>> 125
to check the water level on a boiler online, it is best to_____ - CORRECT ANSWER
>>> blowdown the gauge glass
a steam pressure gauge has a siphon between the boiler and the pressure gauge to _______ -
CORRECT ANSWER >>> prevent Steam from entering the pressure gauge
a safety valve on a boiler pops______ - CORRECT ANSWER >>> between working pressure
and mawp
in a fire tube boiler, the Heat and gases of combustion pass _________ - CORRECT
ANSWER >>> through the tubes
as steam pressure in a boiler increases, there is a corresponding increase in the ______ -
CORRECT ANSWER >>> temperature of steam and water
the safety valve on a boiler _____ - CORRECT ANSWER >>> prevents the boiler from
exceeding its mawp
a steam trap ______ - CORRECT ANSWER >>> automatically remove sand and water
without loss of steam the amount of excess air in gases of combustion is normally determined by the analysis
of______ - CORRECT ANSWER >>> O
before lighting off a boiler during a cold startup, the operator must first______ - CORRECT
ANSWER >>> check for the correct water level
boiler should be warmed up slowly when starting up to ______ - CORRECT ANSWER
>>> allow uniform expansion of drums and tubes
combustion requires____ - CORRECT ANSWER >>> fuel, oxygen, and Heat
the three most common fuels used in boilers are _____ - CORRECT ANSWER >>> gas, fuel
oil, and Coal
incomplete combustion can be caused by ______ - CORRECT ANSWER >>> insufficient air
after replacing a gauge glass but before placing it in service, it is necessary to ______ -
CORRECT ANSWER >>> crack open the steam valve in warm the gauge glass
two bottom blowdown valves are required on boilers operating at pressures above______ psi -
CORRECT ANSWER >>> 100
extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above
____ psi - CORRECT ANSWER >>> 125
package boilers are programmed to _____ - CORRECT ANSWER >>> ignite the burner in
low fire
there are________ sq ft of heating surface in a water tube 3 1/2" in diameter and 20' long -
CORRECT ANSWER >>> 18.
to change 1 lb of water from and at212 °f into steam at atmospheric pressure,______ btu are
necessary - CORRECT ANSWER >>> 970.
a surface condenser is one that______ - CORRECT ANSWER >>> has circulating water
flowing through the tubes and exhaust steam around the outside of the tubes
the overspeed tripping device on a steam turbine must be tripped when____ - CORRECT
ANSWER >>> shutting down the steam turbine
one gallon of no. 6 fuel oil weighs approximately _______ lb. - CORRECT ANSWER >>> 8.
three types of boiler feed water pumps are _____ - CORRECT ANSWER >>> reciprocating,
centrifugal, and turbine
the most important fitting on a boiler is the______ - CORRECT ANSWER >>> safety valve
viscosity of fuel oil is a________ - CORRECT ANSWER >>> measure of internal resistance
to flow
boiler water treatment is required to____ - CORRECT ANSWER >>> prevent scale
formation on eating surfaces
the safety valve______ - CORRECT ANSWER >>> prevents the boiler from exceeding its
mawp
try cocks I used to________ - CORRECT ANSWER >>> as a secondary means to determine
water level
a glass is used to ______ - CORRECT ANSWER >>> indicate the water level in the boiler
before using soap blowers, it is necessary to______ - CORRECT ANSWER >>> open the
steam line on the soot blower
safety valve repair should be done by the________ - CORRECT ANSWER >>> safety valve
manufacturer or an authorized representative
steam at a temperature of 350 degrees Fahrenheit and a pressure of 50 psi is______ -
CORRECT ANSWER >>> superheated
a duplex double-acting reciprocating feed water pump has____ - CORRECT ANSWER
>>> to steam Pistons 2 to 2 2/2 times larger in area than the water piston
an accumulation test is used to determine_______ - CORRECT ANSWER >>> safety valve
capacity a water tube boiler has 250 tubes that are 20 ft long and 3" in diameter. if the boiler produces one BHP for every 10 sq ft of heating surface, the maximum BHP it will produce is________ BHP
- CORRECT ANSWER >>> 392
during a boiler inspection, the main steam stop valves are _______ - CORRECT ANSWER
>>> closed, locked, and tagged
when a quick opening valve is used as a blowdown valve, it is located ______ - CORRECT
ANSWER >>> between the boiler and slow opening valve
listing lovers on safety valves are used to_____ - CORRECT ANSWER >>> manually test
valves
the frequency of performing a bottom blowdown is determined by ______ - CORRECT
ANSWER >>> boiler Water Analysis
ceiling strips that warned of excessive radial tolerance are found on_____ - CORRECT
ANSWER >>> steam turbines
pre-purge, air to fuel ratio, and post Purge of the burner are functions of the _______ -
CORRECT ANSWER >>> combustion controls
a water column______ - CORRECT ANSWER >>> reduces fluctuations of water in the
gauge glass
the low water fuel cutoff can be tested by _____ - CORRECT ANSWER >>> allowing the
water level to drop
boilers that are equipped with air heaters and economizers usually have_____ draft fans -
CORRECT ANSWER >>> forced and induced
baffles are used in the Steam and water drum of water tube boilers to _____ - CORRECT
ANSWER >>> prevent water carry over with the steam
a closed feedwater heater is always installed_______ - CORRECT ANSWER >>> on the
discharge side of the feed water pump
the purpose of a burner pressure control is to _____ - CORRECT ANSWER >>> start and
stop the burner firing cycle
a gas pressure regulator is used to control the ______ - CORRECT ANSWER >>> gas
pressure at the burner
if the chimney temperature is 250 degrees Fahrenheit higher than the Steam and water
temperature, the boiler is _______ - CORRECT ANSWER >>> not operating efficiently
the most controllable heat loss in a boiler is from the loss of heat in______ - CORRECT
ANSWER >>> gases of combustion
on the feed water line, the valve closest to the boiler shell is a _____ valve - CORRECT
ANSWER >>> stop
four basic systems found on boilers are ______< - CORRECT ANSWER >>> steam, feed
water, fuel, and draft
if a low-water condition occurs, the operator should first _______ - CORRECT ANSWER
>>> secure the burners
a pressure control on a boiler is used to. _______ - CORRECT ANSWER >>> control the
operating range of the boiler
sup blowers are most commonly found ______ - CORRECT ANSWER >>> on water tube
boilers
a duplex reciprocating feed water pump operates on the principle that the _______ -
CORRECT ANSWER >>> steam piston area must be 2 to 2 1/2 times larger than the water
piston
approximately. _______^ of air is required to completely burn 1 lb of fuel oil - CORRECT
ANSWER >>> 15 lb
in order to reduce the viscosity of a fuel oil, it's. _______ - CORRECT ANSWER
>>> temperature must be increased
what are is prevented from backing up into the steam line on a deaerator ________ -
CORRECT ANSWER >>> an internal overflow or a loop seal
a steam pressure gauge must have a range of at least. _______ - CORRECT ANSWER >>> 1
1/2 time's the mawp
electrostatic precipitators are used in the power plants to ________ - CORRECT ANSWER
>>> remove fly ash from gases of combustion
valve located between the boiler and water column must be ______ - CORRECT ANSWER
>>> locked or sealed open
the boiling point of water. ________ with an increase in pressure - CORRECT ANSWER
>>> increases
a hole is drilled in the end of a staybolt _______ - CORRECT ANSWER >>> to warn of a
corroded stay
when taking a boiler off line, a vacuum is prevented by. _____ - CORRECT ANSWER
>>> opening the air cock
a valve that requires five 360° turns of the hand wheel to change from fully open to fully closed
is a. _______ valve - CORRECT ANSWER >>> slow opening
a thermostatic steam trap opens when the ______ - CORRECT ANSWER >>> Bellows
contract
a combustion control on a boiler. _______ - CORRECT ANSWER >>> controls the air-fuel
ratio
when coal is classified, ________ refers to hardness - CORRECT ANSWER >>> rank
_______ gauge glasses are used on boilers with precious exceeding 250 psi - CORRECT
ANSWER >>> flat
oxygen and non condensable gases are removed from feed water by ________ - CORRECT
ANSWER >>> heating the water
__________ combustion is when all fuel is burned using only the theoretical amount of air -
CORRECT ANSWER >>> perfect
water tube boilers require less water than. _________ boilers - CORRECT ANSWER
>>> fire tube
a boiler equipped with a draft gauge and registering a negative pressure indicates. _________ -
CORRECT ANSWER >>> atmospheric pressure is greater than furnace pressure
