Page 1 of 45
3RD CLASS STATIONARY STEAM ENGINEER
LICENSE 2026 PREP EXAM COMPLETE (249)
CURRENT TESTING QUESTIONS AND
ANSWERS|GUARANTEED PASS.
STEAM ENGINEER
Prepare effectively with this 3rd Class Stationary Steam
Engineer License Prep Exam, designed to assess essential
knowledge of boiler systems and steam plant operations. It
focuses on steam engineering principles, safety procedures, and
equipment maintenance. The exam strengthens technical
understanding and regulatory compliance for licensing success.
Suitable for stationary engineer certification candidates and
industrial maintenance professionals.
1. what are is prevented from backing up into the steam
line on a deaerator ________ ✓ ✓ ...... ANSWER .......
an internal overflow or a loop seal
2. a steam pressure gauge must have a range of at least.
_______ ✓ ✓ ...... ANSWER ....... 1 1/2 time's the
mawp
, Page 2 of 45
3. electrostatic precipitators are used in the power plants
to ________ ✓ ✓ ...... ANSWER ....... remove fly ash
from gases of combustion
4. valve located between the boiler and water column
must be ______ ✓ ✓ ...... ANSWER ....... locked or
sealed open
5. the boiling point of water. ________ with an increase in
pressure ✓ ✓ ...... ANSWER ....... increases
6. a hole is drilled in the end of a staybolt _______ ✓ ✓
...... ANSWER ....... to warn of a corroded stay
7. when taking a boiler off line, a vacuum is prevented by.
_____ ✓ ✓ ...... ANSWER ....... opening the air cock
8. a valve that requires five 360° turns of the hand wheel to
change from fully open to fully closed is a. _______ valve
✓ ✓ ...... ANSWER ....... slow opening
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9. a thermostatic steam trap opens when the ______ ✓ ✓
...... ANSWER ....... Bellows contract
10. a combustion control on a boiler. _______ ✓ ✓ ......
ANSWER ....... controls the air-fuel ratio
11. when coal is classified, ________ refers to hardness
✓ ✓ ...... ANSWER ....... rank
12. _______ gauge glasses are used on boilers with
precious exceeding 250 psi ✓ ✓ ...... ANSWER .......
flat
13. oxygen and non condensable gases are removed
from feed water by ________ ✓ ✓ ...... ANSWER .......
heating the water
14. __________ combustion is when all fuel is burned
using only the theoretical amount of air ✓ ✓ ......
ANSWER ....... perfect
, Page 4 of 45
15. water tube boilers require less water than.
_________ boilers ✓ ✓ ...... ANSWER ....... fire tube
16. a boiler equipped with a draft gauge and registering
a negative pressure indicates. _________ ✓ ✓ ......
ANSWER ....... atmospheric pressure is greater than
furnace pressure
17. pressure atomizing burners atomized fuel oil using
_______ ✓ ✓ ...... ANSWER ....... a nozzle
18. the. _________ on the steam turbine functions as a
limit switch ✓ ✓ ...... ANSWER ....... overspeed trip
19. circulating water passes through a surface
condenser. ________ ✓ ✓ ...... ANSWER ....... inside
the tubes
20. The Pour point of a fuel oil is. ________ ✓ ✓ ......
ANSWER ....... the lowest temperature at which oil
will flow
3RD CLASS STATIONARY STEAM ENGINEER
LICENSE 2026 PREP EXAM COMPLETE (249)
CURRENT TESTING QUESTIONS AND
ANSWERS|GUARANTEED PASS.
STEAM ENGINEER
Prepare effectively with this 3rd Class Stationary Steam
Engineer License Prep Exam, designed to assess essential
knowledge of boiler systems and steam plant operations. It
focuses on steam engineering principles, safety procedures, and
equipment maintenance. The exam strengthens technical
understanding and regulatory compliance for licensing success.
Suitable for stationary engineer certification candidates and
industrial maintenance professionals.
1. what are is prevented from backing up into the steam
line on a deaerator ________ ✓ ✓ ...... ANSWER .......
an internal overflow or a loop seal
2. a steam pressure gauge must have a range of at least.
_______ ✓ ✓ ...... ANSWER ....... 1 1/2 time's the
mawp
, Page 2 of 45
3. electrostatic precipitators are used in the power plants
to ________ ✓ ✓ ...... ANSWER ....... remove fly ash
from gases of combustion
4. valve located between the boiler and water column
must be ______ ✓ ✓ ...... ANSWER ....... locked or
sealed open
5. the boiling point of water. ________ with an increase in
pressure ✓ ✓ ...... ANSWER ....... increases
6. a hole is drilled in the end of a staybolt _______ ✓ ✓
...... ANSWER ....... to warn of a corroded stay
7. when taking a boiler off line, a vacuum is prevented by.
_____ ✓ ✓ ...... ANSWER ....... opening the air cock
8. a valve that requires five 360° turns of the hand wheel to
change from fully open to fully closed is a. _______ valve
✓ ✓ ...... ANSWER ....... slow opening
, Page 3 of 45
9. a thermostatic steam trap opens when the ______ ✓ ✓
...... ANSWER ....... Bellows contract
10. a combustion control on a boiler. _______ ✓ ✓ ......
ANSWER ....... controls the air-fuel ratio
11. when coal is classified, ________ refers to hardness
✓ ✓ ...... ANSWER ....... rank
12. _______ gauge glasses are used on boilers with
precious exceeding 250 psi ✓ ✓ ...... ANSWER .......
flat
13. oxygen and non condensable gases are removed
from feed water by ________ ✓ ✓ ...... ANSWER .......
heating the water
14. __________ combustion is when all fuel is burned
using only the theoretical amount of air ✓ ✓ ......
ANSWER ....... perfect
, Page 4 of 45
15. water tube boilers require less water than.
_________ boilers ✓ ✓ ...... ANSWER ....... fire tube
16. a boiler equipped with a draft gauge and registering
a negative pressure indicates. _________ ✓ ✓ ......
ANSWER ....... atmospheric pressure is greater than
furnace pressure
17. pressure atomizing burners atomized fuel oil using
_______ ✓ ✓ ...... ANSWER ....... a nozzle
18. the. _________ on the steam turbine functions as a
limit switch ✓ ✓ ...... ANSWER ....... overspeed trip
19. circulating water passes through a surface
condenser. ________ ✓ ✓ ...... ANSWER ....... inside
the tubes
20. The Pour point of a fuel oil is. ________ ✓ ✓ ......
ANSWER ....... the lowest temperature at which oil
will flow
