Power engineering 5th class Exam
2025 Questions and Answers
Cast-iron sectional boilers have flue gas passages which - CORRECT ANSWER✔️✔️-Increase
heat transfer
Steel plate heating boilers have thin steel installed in the - CORRECT ANSWER✔️✔️-Firetubes to
give the gases a swirling motion
The vertical firetube boiler has a cylindrical shell with tubes connected between the - CORRECT
ANSWER✔️✔️-Upper and lower tube sheets
Vertical firetube boilers have an advantage when___________ is limited. - CORRECT
ANSWER✔️✔️-Floor space
The "A" type boiler is constructed with _________ drums. - CORRECT ANSWER✔️✔️-three
In general construction the Firebox boiler is not unlike the____________ boiler. - CORRECT
ANSWER✔️✔️-locomotive
A modular cast-iron heating boiler - CORRECT ANSWER✔️✔️-Consists of a number of
horizontal sectional cast-iron boilers
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,The HRT boiler is classified as a _______ pass boiler. - CORRECT ANSWER✔️✔️-two
The boilers or modules in a multiple heating boiler plant are: - CORRECT ANSWER✔️✔️-Most
typically connected in parallel between the supply and return header
The switch in the operating control of a steam boiler is closed by: - CORRECT ANSWER✔️✔️-
Falling steam pressure
A thermocouple consists of two dissimilar wires welded together at one end to form a: - CORRECT
ANSWER✔️✔️-Hot junction
A heating boiler must have a permanently attached marker indicating: - CORRECT
ANSWER✔️✔️-Lowest permissible water level
What is the name given to the component that coordinates and sequences the boiler operation? -
CORRECT ANSWER✔️✔️-Programming controller
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. - CORRECT
ANSWER✔️✔️-1.5
The programmed startup sequence of oil-fired boilers with no pilot light is as follows: - CORRECT
ANSWER✔️✔️-1. The operating control closes a switch
2. The load relay energizes the ignition transformer, fuel oil shut-off valve, and motor driving the air
fan and fuel pump
3. The spark from the ignition transformer ignites the main burner
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, 4. The flame detector senses the flame and causes the flame relay to close5. The ignition transformer
is then de-energized
The boiler vent valve is used for the purpose of allowing: - CORRECT ANSWER✔️✔️-Air to
escape while filling
If for any reason, the burner should go out during normal operation, or the fuel should fail to ignite
during startup: - CORRECT ANSWER✔️✔️-The fuel to the burner must be shut off immediately
The discharge piping from the relief valve should be piped to a safe point for disposal and can be: -
CORRECT ANSWER✔️✔️-Terminated above a floor drain
The time taken for the automatic pilot valve to close in the event of a loss of flame detection is
about ______ seconds - CORRECT ANSWER✔️✔️-10
The boiler firebox, gas passages and chimney should be thoroughly cleaned by wire brushing and: -
CORRECT ANSWER✔️✔️-Vacuuming
Leakage of a few drops a minute leakage from the packing gland of circulating pumps is desirable to
prevent drying out of packing and: - CORRECT ANSWER✔️✔️-Scoring of the shaft
Boiler explosions may be listed under two general classifications: - CORRECT ANSWER✔️✔️-
Furnace explosions and Pressure explosions
If the water level in a steam boiler is found to be below the gauge glass, the boiler should be: -
CORRECT ANSWER✔️✔️-Shut down immediately
When inspecting the fireside of the boiler the surfaces are examined for bulges or blisters which
would indicate: - CORRECT ANSWER✔️✔️-Overheating
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
2025 Questions and Answers
Cast-iron sectional boilers have flue gas passages which - CORRECT ANSWER✔️✔️-Increase
heat transfer
Steel plate heating boilers have thin steel installed in the - CORRECT ANSWER✔️✔️-Firetubes to
give the gases a swirling motion
The vertical firetube boiler has a cylindrical shell with tubes connected between the - CORRECT
ANSWER✔️✔️-Upper and lower tube sheets
Vertical firetube boilers have an advantage when___________ is limited. - CORRECT
ANSWER✔️✔️-Floor space
The "A" type boiler is constructed with _________ drums. - CORRECT ANSWER✔️✔️-three
In general construction the Firebox boiler is not unlike the____________ boiler. - CORRECT
ANSWER✔️✔️-locomotive
A modular cast-iron heating boiler - CORRECT ANSWER✔️✔️-Consists of a number of
horizontal sectional cast-iron boilers
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,The HRT boiler is classified as a _______ pass boiler. - CORRECT ANSWER✔️✔️-two
The boilers or modules in a multiple heating boiler plant are: - CORRECT ANSWER✔️✔️-Most
typically connected in parallel between the supply and return header
The switch in the operating control of a steam boiler is closed by: - CORRECT ANSWER✔️✔️-
Falling steam pressure
A thermocouple consists of two dissimilar wires welded together at one end to form a: - CORRECT
ANSWER✔️✔️-Hot junction
A heating boiler must have a permanently attached marker indicating: - CORRECT
ANSWER✔️✔️-Lowest permissible water level
What is the name given to the component that coordinates and sequences the boiler operation? -
CORRECT ANSWER✔️✔️-Programming controller
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. - CORRECT
ANSWER✔️✔️-1.5
The programmed startup sequence of oil-fired boilers with no pilot light is as follows: - CORRECT
ANSWER✔️✔️-1. The operating control closes a switch
2. The load relay energizes the ignition transformer, fuel oil shut-off valve, and motor driving the air
fan and fuel pump
3. The spark from the ignition transformer ignites the main burner
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, 4. The flame detector senses the flame and causes the flame relay to close5. The ignition transformer
is then de-energized
The boiler vent valve is used for the purpose of allowing: - CORRECT ANSWER✔️✔️-Air to
escape while filling
If for any reason, the burner should go out during normal operation, or the fuel should fail to ignite
during startup: - CORRECT ANSWER✔️✔️-The fuel to the burner must be shut off immediately
The discharge piping from the relief valve should be piped to a safe point for disposal and can be: -
CORRECT ANSWER✔️✔️-Terminated above a floor drain
The time taken for the automatic pilot valve to close in the event of a loss of flame detection is
about ______ seconds - CORRECT ANSWER✔️✔️-10
The boiler firebox, gas passages and chimney should be thoroughly cleaned by wire brushing and: -
CORRECT ANSWER✔️✔️-Vacuuming
Leakage of a few drops a minute leakage from the packing gland of circulating pumps is desirable to
prevent drying out of packing and: - CORRECT ANSWER✔️✔️-Scoring of the shaft
Boiler explosions may be listed under two general classifications: - CORRECT ANSWER✔️✔️-
Furnace explosions and Pressure explosions
If the water level in a steam boiler is found to be below the gauge glass, the boiler should be: -
CORRECT ANSWER✔️✔️-Shut down immediately
When inspecting the fireside of the boiler the surfaces are examined for bulges or blisters which
would indicate: - CORRECT ANSWER✔️✔️-Overheating
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
