1
3rd Class Stationary Steam
Engineer License Prep Questions
& Correct Answers 2025. Graded A
______ draft is produced by a fan located between the boiler and the
chimney - ANSinduced
_______ gauge glasses are used on boilers with precious exceeding 250
psi - ANSflat
_______ is caused by allowing sudden extreme changes of temperature in
a furnace - ANSspalling
________ boilers can operate at higher pressures than fire tube boilers -
ANSwater tube
_________ are necessary for complete combustion - ANStime,
temperature, mixture, and atomization
_________ is always necessary in the combustion process - ANSoxygen
_________ is required for combustion - ANSatomization of fuel, oxygen,
and Heat
1
, 2
__________ combustion is when all fuel is burned using only the
theoretical amount of air - ANSperfect
__________ steam turbines allow condensate to be reclaimed for use in
the system - ANScondensing
_________is carrying over particles of water with the steam - ANSpriming
a ________ allows condensate to pass through, but stops Steam. - ANSa
steam trap
a ________ pump is a positive displacement pump - ANSreciprocating
a (n) ________ valve offers the least resistance to flow - ANSgate
a boiler burning fuel oil and using forced-draft requires. ________ cu ft a
furnace volume per boiler horsepower - ANS.75
a boiler connected in battery requires a free blowing drain between the two
stop valves when the ______ - ANSboiler has a manhole opening
a boiler equipped with a draft gauge and registering a negative pressure
indicates. _________ - ANSatmospheric pressure is greater than furnace
pressure
2
, 3
a boiler evaporates 48,000 lb of steam/hr. it evaporates 12 lb of steam/sq ft
of heating surface per hour. The boiler has _______ as ft of heating surface
- ANS4000
a boiler generating 6000 lb of steam/hr produces _______btu/hr -
ANS6,000,000
a boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and
closes at 398 PSI. The blowdown is______psi - ANS12
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 - ANSsuperheated
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. -
ANS3795
a boiler with 3450 sq ft of heating surface design for 5 sq ft of heating
surface / BHP has ________ hp - ANS690
a boiler with a draft gauge showing a positive pressure indicates_____ -
ANSfurnace pressure is above atmospheric pressure
a bottom blowdown is performed on a boiler to _____ - ANSdischarge
sludge and sediment
3
3rd Class Stationary Steam
Engineer License Prep Questions
& Correct Answers 2025. Graded A
______ draft is produced by a fan located between the boiler and the
chimney - ANSinduced
_______ gauge glasses are used on boilers with precious exceeding 250
psi - ANSflat
_______ is caused by allowing sudden extreme changes of temperature in
a furnace - ANSspalling
________ boilers can operate at higher pressures than fire tube boilers -
ANSwater tube
_________ are necessary for complete combustion - ANStime,
temperature, mixture, and atomization
_________ is always necessary in the combustion process - ANSoxygen
_________ is required for combustion - ANSatomization of fuel, oxygen,
and Heat
1
, 2
__________ combustion is when all fuel is burned using only the
theoretical amount of air - ANSperfect
__________ steam turbines allow condensate to be reclaimed for use in
the system - ANScondensing
_________is carrying over particles of water with the steam - ANSpriming
a ________ allows condensate to pass through, but stops Steam. - ANSa
steam trap
a ________ pump is a positive displacement pump - ANSreciprocating
a (n) ________ valve offers the least resistance to flow - ANSgate
a boiler burning fuel oil and using forced-draft requires. ________ cu ft a
furnace volume per boiler horsepower - ANS.75
a boiler connected in battery requires a free blowing drain between the two
stop valves when the ______ - ANSboiler has a manhole opening
a boiler equipped with a draft gauge and registering a negative pressure
indicates. _________ - ANSatmospheric pressure is greater than furnace
pressure
2
, 3
a boiler evaporates 48,000 lb of steam/hr. it evaporates 12 lb of steam/sq ft
of heating surface per hour. The boiler has _______ as ft of heating surface
- ANS4000
a boiler generating 6000 lb of steam/hr produces _______btu/hr -
ANS6,000,000
a boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and
closes at 398 PSI. The blowdown is______psi - ANS12
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 - ANSsuperheated
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. -
ANS3795
a boiler with 3450 sq ft of heating surface design for 5 sq ft of heating
surface / BHP has ________ hp - ANS690
a boiler with a draft gauge showing a positive pressure indicates_____ -
ANSfurnace pressure is above atmospheric pressure
a bottom blowdown is performed on a boiler to _____ - ANSdischarge
sludge and sediment
3
