1|Page
3rd Class Stationary Steam Engineer
License Prep Exam 2025| Certified Q&A
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
,2|Page
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-18.32
to change 1 lb of water from and at212 °f into steam at atmospheric
pressure,______ btu are necessary - correct-answer-970.3
a surface condenser is one that______ - correct-answer-has circulating water
flowing through the tubes and exhaust steam around the outside of the tubes
a boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size
feed water pump to supply this boiler is ________ gal./hr. - correct-answer-3795
,3|Page
three types of draft used in power plants are______ - correct-answer-natural,
forest, and induced
in a water tube boiler, heat and gases of combustion pass______ - correct-
answer-around the tubes
when the burner is in high fire, the______ - correct-answer-air-fuel ratio is at
maximum rate
a boiler with a draft gauge showing a positive pressure indicates_____ - correct-
answer-furnace pressure is above atmospheric pressure
downcomer tubes are found _____ - correct-answer-in a water tube boiler
a boiler connected in battery requires a free blowing drain between the two stop
valves when the ______ - correct-answer-boiler has a manhole opening
most furnace explosions are caused by _____ - correct-answer-failure to purge
the furnace at startup
, 4|Page
baffles in the boiler are designed to direct gases of combustion for close contact
with the ________ - correct-answer-boiler heating surface
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-8.2
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
3rd Class Stationary Steam Engineer
License Prep Exam 2025| Certified Q&A
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
,2|Page
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-18.32
to change 1 lb of water from and at212 °f into steam at atmospheric
pressure,______ btu are necessary - correct-answer-970.3
a surface condenser is one that______ - correct-answer-has circulating water
flowing through the tubes and exhaust steam around the outside of the tubes
a boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size
feed water pump to supply this boiler is ________ gal./hr. - correct-answer-3795
,3|Page
three types of draft used in power plants are______ - correct-answer-natural,
forest, and induced
in a water tube boiler, heat and gases of combustion pass______ - correct-
answer-around the tubes
when the burner is in high fire, the______ - correct-answer-air-fuel ratio is at
maximum rate
a boiler with a draft gauge showing a positive pressure indicates_____ - correct-
answer-furnace pressure is above atmospheric pressure
downcomer tubes are found _____ - correct-answer-in a water tube boiler
a boiler connected in battery requires a free blowing drain between the two stop
valves when the ______ - correct-answer-boiler has a manhole opening
most furnace explosions are caused by _____ - correct-answer-failure to purge
the furnace at startup
, 4|Page
baffles in the boiler are designed to direct gases of combustion for close contact
with the ________ - correct-answer-boiler heating surface
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-8.2
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
