3RD CLASS STATIONARY STEAM ENGINEER
LICENSE 250 QUESTIONS & CORRECT ANSWERS
LATEST 2025
_________ are necessary for complete combustion - ANSWER-time, temperature,
mixture, and atomization
if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ -
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 - ANSWER-12
an oil cooler is commonly used with a(n) ________ when operating in conjunction
with a turbo-generator - 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 -
ANSWER-superheated
the economizer on a boiler is used to _______ - ANSWER-add heat to the feed
water
blowers are normally used with________ boilers - ANSWER-water tube
,overheating of tubes on a boiler can be caused by________ - ANSWER-scale on
tubes
carbon dioxide in a condensate return system causes_________ - ANSWER-
channeling
a ________ pump is a positive displacement pump - ANSWER-reciprocating
a boiler generating 6000 lb of steam/hr produces _______btu/hr - ANSWER-
6,000,000
a bottom blowdown is performed on a boiler to _____ - ANSWER-discharge
sludge and sediment
water columns are connected to the boiler with a minimum of _______" pipe -
ANSWER-1
the minimum size of a water column blowdown valve is_______". - ANSWER-3/4
the maximum size bottom blowdown valve on a boiler is_________". - ANSWER-
2 1/2
a ________ allows condensate to pass through, but stops Steam. - ANSWER-a
steam trap
when taking over a shift, the first thing to do is check the________ - 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________ - ANSWER-two or more safety valves
the probable cause of an increase in temperature of gases of combustion at the
boiler Outlet is____ - ANSWER-dirty heating services
boilers in battery equipped with________ must have two main steam stop valves
and a free-flowing drain between them - ANSWER-manhole openings
in order to be sure the gauge glass is indicating an accurate water level reading, the
stationary engineer should______ - ANSWER-blowdown the gauge glass
a continuous blowdown line is located___ - ANSWER-in the Steam and water
drum well below the nowl
a temperature reading of 80 degrees Celsius is equal to_________°f - ANSWER-
176
a chimney temperature of 250 degrees Fahrenheit above steam temperature
indicates_______ - ANSWER-poor efficiency
a manometer is red in________ - ANSWER-inches of water
the boiling point of water will____ with an increase in pressure - ANSWER-be
raised
if a lather is not obtained when performing a soap hardness test, the water sample
is_______ - ANSWER-hard
LICENSE 250 QUESTIONS & CORRECT ANSWERS
LATEST 2025
_________ are necessary for complete combustion - ANSWER-time, temperature,
mixture, and atomization
if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ -
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 - ANSWER-12
an oil cooler is commonly used with a(n) ________ when operating in conjunction
with a turbo-generator - 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 -
ANSWER-superheated
the economizer on a boiler is used to _______ - ANSWER-add heat to the feed
water
blowers are normally used with________ boilers - ANSWER-water tube
,overheating of tubes on a boiler can be caused by________ - ANSWER-scale on
tubes
carbon dioxide in a condensate return system causes_________ - ANSWER-
channeling
a ________ pump is a positive displacement pump - ANSWER-reciprocating
a boiler generating 6000 lb of steam/hr produces _______btu/hr - ANSWER-
6,000,000
a bottom blowdown is performed on a boiler to _____ - ANSWER-discharge
sludge and sediment
water columns are connected to the boiler with a minimum of _______" pipe -
ANSWER-1
the minimum size of a water column blowdown valve is_______". - ANSWER-3/4
the maximum size bottom blowdown valve on a boiler is_________". - ANSWER-
2 1/2
a ________ allows condensate to pass through, but stops Steam. - ANSWER-a
steam trap
when taking over a shift, the first thing to do is check the________ - 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________ - ANSWER-two or more safety valves
the probable cause of an increase in temperature of gases of combustion at the
boiler Outlet is____ - ANSWER-dirty heating services
boilers in battery equipped with________ must have two main steam stop valves
and a free-flowing drain between them - ANSWER-manhole openings
in order to be sure the gauge glass is indicating an accurate water level reading, the
stationary engineer should______ - ANSWER-blowdown the gauge glass
a continuous blowdown line is located___ - ANSWER-in the Steam and water
drum well below the nowl
a temperature reading of 80 degrees Celsius is equal to_________°f - ANSWER-
176
a chimney temperature of 250 degrees Fahrenheit above steam temperature
indicates_______ - ANSWER-poor efficiency
a manometer is red in________ - ANSWER-inches of water
the boiling point of water will____ with an increase in pressure - ANSWER-be
raised
if a lather is not obtained when performing a soap hardness test, the water sample
is_______ - ANSWER-hard
