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3RD CLASS STATIONARY STEAM
ENGINEER LICENSE PREP QUESTIONS
AND ANSWERS 2025
_________ 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- 214.7
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
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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- 6,000,000
a bottom blowdown is performed on a boiler to _____ - correct
answer- discharge sludge and sediment
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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- 3/4
the maximum size bottom blowdown valve on a boiler
is_________". - correct answer- 2 1/2
a ________ allows condensate to pass through, but stops
Steam. - correct answer- a steam trap
when taking over a shift, the first thing to do is check
the________ - correct answer- water level in each boiler
according to the asme code, a high-pressure boiler having
more than 500 square feet of heating surface shall
have________ - correct answer- two or more safety valves
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the probable cause of an increase in temperature of gases of
combustion at the boiler Outlet is____ - correct answer- dirty
heating services
boilers in battery equipped with________ must have two main
steam stop valves and a free-flowing drain between them -
correct answer- manhole openings
in order to be sure the gauge glass is indicating an accurate
water level reading, the stationary engineer should______ -
correct answer- blowdown the gauge glass
a continuous blowdown line is located___ - correct answer- in
the Steam and water drum well below the nowl
a temperature reading of 80 degrees Celsius is equal
to_________°f - correct answer- 176
a chimney temperature of 250 degrees Fahrenheit above
steam temperature indicates_______ - correct answer- poor
efficiency
3RD CLASS STATIONARY STEAM
ENGINEER LICENSE PREP QUESTIONS
AND ANSWERS 2025
_________ 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- 214.7
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
,2 | Page
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- 6,000,000
a bottom blowdown is performed on a boiler to _____ - correct
answer- discharge sludge and sediment
,3 | Page
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- 3/4
the maximum size bottom blowdown valve on a boiler
is_________". - correct answer- 2 1/2
a ________ allows condensate to pass through, but stops
Steam. - correct answer- a steam trap
when taking over a shift, the first thing to do is check
the________ - correct answer- water level in each boiler
according to the asme code, a high-pressure boiler having
more than 500 square feet of heating surface shall
have________ - correct answer- two or more safety valves
, 4 | Page
the probable cause of an increase in temperature of gases of
combustion at the boiler Outlet is____ - correct answer- dirty
heating services
boilers in battery equipped with________ must have two main
steam stop valves and a free-flowing drain between them -
correct answer- manhole openings
in order to be sure the gauge glass is indicating an accurate
water level reading, the stationary engineer should______ -
correct answer- blowdown the gauge glass
a continuous blowdown line is located___ - correct answer- in
the Steam and water drum well below the nowl
a temperature reading of 80 degrees Celsius is equal
to_________°f - correct answer- 176
a chimney temperature of 250 degrees Fahrenheit above
steam temperature indicates_______ - correct answer- poor
efficiency
