5th Class Power Engineering Exam Questions
and Answers- Latest Updated 2026-2027-
Graded A+
1. Cast-iron sectional boilers have flue gas passages which: Increase heat transfer
2. Steel plate heating boilers have thin steel installed in the: Firetubes to give the gases
a swirling motion
3. The vertical firetube boiler has a cylindrical shell with tubes connected
between the: Upper and lower tube sheets
4. Vertical firetube boilers have an advantage when is limited.: Floor
space
5. The "A" type boiler is constructed with drums.: three
6. In general construction the Firebox boiler is not unlike the boil-
er.: locomotive
7. A modular cast-iron heating boiler: Consists of a number of horizontal sectional cast-iron boilers
8. The HRT boiler is classified as a pass boiler.: two
9. The boilers or modules in a multiple heating boiler plant are:: Most typically
connected in parallel between the supply and return header
10. The switch in the operating control of a steam boiler is closed by:: Falling steam
pressure
11. A thermocouple consists of two dissimilar wires welded together at one end
to form a:: Hot junction
12. A heating boiler must have a permanently attached marker indicating:: Low-
est permissible water level
13. What is the name given to the component that coordinates and sequences
the boiler operation?: Programming controller
14. On a hot water boiler, the highest value on the graduated scale of the
pressure gauge shall not be less than times the pressure at which the
pressure relief valve is set.: 1.5
,15. The programmed startup sequence of oil-fired boilers with no pilot light is
as follows:: 1. The operating control closes a switch
2. The load relay energizes the ignition transformer, fuel oil shut-ott valve, and motor driving the air fan and fuel pump
3. The spark from the ignition transformer ignites the main burner
4. The flame detector senses the flame and causes the flame relay to close5. The ignition transformer is then
de-energized
, 16. The boiler vent valve is used for the purpose of allowing:: Air to escape while filling
17. If for any reason, the burner should go out during normal operation, or the
fuel should fail to ignite during startup:: The fuel to the burner must be shut ott immediately
18. The discharge piping from the relief valve should be piped to a safe point
for disposal and can be:: Terminated above a floor drain
19. The time taken for the automatic pilot valve to close in the event of a loss
of flame detection is about seconds: 10
20. The boiler firebox, gas passages and chimney should be thoroughly
cleaned by wire brushing and:: Vacuuming
21. Leakage of a few drops a minute leakage from the packing gland of circu-
lating pumps is desirable to prevent drying out of packing and:: Scoring of the shaft
22. Boiler explosions may be listed under two general classifications:: Furnace
explosions and Pressure explosions
23. If the water level in a steam boiler is found to be below the gauge glass, the
boiler should be:: Shut down immediately
24. When inspecting the fireside of the boiler the surfaces are examined for
bulges or blisters which would indicate:: Overheating
25. Which of the following is done to prevent excessive stresses of boiler metal
due to uneven expansion?: Warm the boiler up as slowly as possible
26. The dye penetrant, entrapped in a crack, is brought to the surface by the
action of the:: Developer
27. The boiler certificate of inspection:: Should be conspicuously placed adjacent to the boiler or
retained and safeguarded in a manner approved by the inspector
28. With reference to Power Engineering the letters "SIAP" mean:: Sense, Interpret,
Analyze, Perform
29. Hydrostatic testing of a boiler requires that the pressure be raised to
the Maximum Allowable Working Pressure stamped on the boil-
er.: 1.5 times
30. An intermittent pilot:: Is automatically ignited at the start of each burner operation and continues to
burn throughout the main burner period
and Answers- Latest Updated 2026-2027-
Graded A+
1. Cast-iron sectional boilers have flue gas passages which: Increase heat transfer
2. Steel plate heating boilers have thin steel installed in the: Firetubes to give the gases
a swirling motion
3. The vertical firetube boiler has a cylindrical shell with tubes connected
between the: Upper and lower tube sheets
4. Vertical firetube boilers have an advantage when is limited.: Floor
space
5. The "A" type boiler is constructed with drums.: three
6. In general construction the Firebox boiler is not unlike the boil-
er.: locomotive
7. A modular cast-iron heating boiler: Consists of a number of horizontal sectional cast-iron boilers
8. The HRT boiler is classified as a pass boiler.: two
9. The boilers or modules in a multiple heating boiler plant are:: Most typically
connected in parallel between the supply and return header
10. The switch in the operating control of a steam boiler is closed by:: Falling steam
pressure
11. A thermocouple consists of two dissimilar wires welded together at one end
to form a:: Hot junction
12. A heating boiler must have a permanently attached marker indicating:: Low-
est permissible water level
13. What is the name given to the component that coordinates and sequences
the boiler operation?: Programming controller
14. On a hot water boiler, the highest value on the graduated scale of the
pressure gauge shall not be less than times the pressure at which the
pressure relief valve is set.: 1.5
,15. The programmed startup sequence of oil-fired boilers with no pilot light is
as follows:: 1. The operating control closes a switch
2. The load relay energizes the ignition transformer, fuel oil shut-ott valve, and motor driving the air fan and fuel pump
3. The spark from the ignition transformer ignites the main burner
4. The flame detector senses the flame and causes the flame relay to close5. The ignition transformer is then
de-energized
, 16. The boiler vent valve is used for the purpose of allowing:: Air to escape while filling
17. If for any reason, the burner should go out during normal operation, or the
fuel should fail to ignite during startup:: The fuel to the burner must be shut ott immediately
18. The discharge piping from the relief valve should be piped to a safe point
for disposal and can be:: Terminated above a floor drain
19. The time taken for the automatic pilot valve to close in the event of a loss
of flame detection is about seconds: 10
20. The boiler firebox, gas passages and chimney should be thoroughly
cleaned by wire brushing and:: Vacuuming
21. Leakage of a few drops a minute leakage from the packing gland of circu-
lating pumps is desirable to prevent drying out of packing and:: Scoring of the shaft
22. Boiler explosions may be listed under two general classifications:: Furnace
explosions and Pressure explosions
23. If the water level in a steam boiler is found to be below the gauge glass, the
boiler should be:: Shut down immediately
24. When inspecting the fireside of the boiler the surfaces are examined for
bulges or blisters which would indicate:: Overheating
25. Which of the following is done to prevent excessive stresses of boiler metal
due to uneven expansion?: Warm the boiler up as slowly as possible
26. The dye penetrant, entrapped in a crack, is brought to the surface by the
action of the:: Developer
27. The boiler certificate of inspection:: Should be conspicuously placed adjacent to the boiler or
retained and safeguarded in a manner approved by the inspector
28. With reference to Power Engineering the letters "SIAP" mean:: Sense, Interpret,
Analyze, Perform
29. Hydrostatic testing of a boiler requires that the pressure be raised to
the Maximum Allowable Working Pressure stamped on the boil-
er.: 1.5 times
30. An intermittent pilot:: Is automatically ignited at the start of each burner operation and continues to
burn throughout the main burner period
