ABSA-Final 5th Class Exam Questions
with Guaranteed Pass Solutions 2025-
2026 Updated.
Where are the return openings located regarding air distribution systems? - Answer Return
air openings are located on inner walls.
The minimum temperature of the water used in a hydrostatic test of a boiler cannot be less than
what temperature? - Answer 20 degrees Celsius
Which of the following are causes of pressure explosions?
1. effects of corrosion
2. weak pilot flame
3. stressed material due to heating too quickly
4. insufficient purge
5. scale and sludge build-up - Answer 1, 3, 5
Carbon, which is not combined with hydrogen, is referred to as: - Answer Fixed Carbon
Maximum static pressure in a fuel oil line is approximately: - Answer 35 kPa
Combustion of a fuel in a boiler furnace: - Answer should be performed with a minimum of
excess air
What is a hydrostatic test? - Answer A way in which pressure vessels can be tested for
strength and leaks.
How often do burner and fan motors which uses standard bearing normally require lubrication?
- Answer Yearly
,On a hot water boiler, the pressure differential between the operating pressure and the safety
relief valve set pressure must be (at a minimum):
1. 25% of operating pressure
2. 125% of operating pressure
3. 69 kPa
4. 25% of the safety relief valve set pressure - Answer 3, 4
In hot water boiler operation the maximum operating temperature should never exceed: -
Answer 121 degrees celsius
A substance, which will absorb humidity inside a boiler during dry lay up is: - Answer
Activated alumina
When draft is produced by natural means: - Answer cooler air surrounding the boiler
increases draft
Coal is composed of the following combustible components: - Answer Carbon, hydrogen,
Sulphur
Which of the following are causes of furnace explosions?
1. main fuel valve closed when the burner flame is lost
2. insufficient purge
3. burners lit from hot refractory
4. effects of corrosion
5. admission of fuel before ignition source - Answer 3,4,5
, Which grade of oil is the most popular for domestic and small commercial boilers? - Answer
Grade 2
The inclined manometer as compared to the U manometer is what? - Answer More
accurate.
How can the draft through a natural draft furnace be increased? - Answer Increase the
temperature of the stack
The main function of a gas burner is: - Answer provision of O2 - fuel contact
The minimum distance from furnace to oil storage tank is: - Answer 2 feet
One of the main component of an electric ignition system is the step-up transformer which
takes 120 V and boosts it to _____ volts - Answer 10,000 - 12,000 volts.
Combustion of a fuel in a boiler furnace should be performed in what conditions? - Answer
There should be a minimum of excess air.
What type of oil burner is used when oil is supplied under high pressure? - Answer
Mechanical Atomizing Burner
An air atomizing compressor is usually what type? - Answer A rotary type.
Which of the following advantages does oil have over coal as a boiler fuel?
1. requires less storage space
2. costs less to handle
3. fuel quantity is easier to control
4. burns more cleanly - Answer All of the above
In a boiler burner with 3 fixed capacity nozzles,the intermediate and high burner nozzles have
higher capacities than the primary burner nozzle for what reason? - Answer To allow better
boiler warm-ups
What is a manometer used for? - Answer Measure draft
with Guaranteed Pass Solutions 2025-
2026 Updated.
Where are the return openings located regarding air distribution systems? - Answer Return
air openings are located on inner walls.
The minimum temperature of the water used in a hydrostatic test of a boiler cannot be less than
what temperature? - Answer 20 degrees Celsius
Which of the following are causes of pressure explosions?
1. effects of corrosion
2. weak pilot flame
3. stressed material due to heating too quickly
4. insufficient purge
5. scale and sludge build-up - Answer 1, 3, 5
Carbon, which is not combined with hydrogen, is referred to as: - Answer Fixed Carbon
Maximum static pressure in a fuel oil line is approximately: - Answer 35 kPa
Combustion of a fuel in a boiler furnace: - Answer should be performed with a minimum of
excess air
What is a hydrostatic test? - Answer A way in which pressure vessels can be tested for
strength and leaks.
How often do burner and fan motors which uses standard bearing normally require lubrication?
- Answer Yearly
,On a hot water boiler, the pressure differential between the operating pressure and the safety
relief valve set pressure must be (at a minimum):
1. 25% of operating pressure
2. 125% of operating pressure
3. 69 kPa
4. 25% of the safety relief valve set pressure - Answer 3, 4
In hot water boiler operation the maximum operating temperature should never exceed: -
Answer 121 degrees celsius
A substance, which will absorb humidity inside a boiler during dry lay up is: - Answer
Activated alumina
When draft is produced by natural means: - Answer cooler air surrounding the boiler
increases draft
Coal is composed of the following combustible components: - Answer Carbon, hydrogen,
Sulphur
Which of the following are causes of furnace explosions?
1. main fuel valve closed when the burner flame is lost
2. insufficient purge
3. burners lit from hot refractory
4. effects of corrosion
5. admission of fuel before ignition source - Answer 3,4,5
, Which grade of oil is the most popular for domestic and small commercial boilers? - Answer
Grade 2
The inclined manometer as compared to the U manometer is what? - Answer More
accurate.
How can the draft through a natural draft furnace be increased? - Answer Increase the
temperature of the stack
The main function of a gas burner is: - Answer provision of O2 - fuel contact
The minimum distance from furnace to oil storage tank is: - Answer 2 feet
One of the main component of an electric ignition system is the step-up transformer which
takes 120 V and boosts it to _____ volts - Answer 10,000 - 12,000 volts.
Combustion of a fuel in a boiler furnace should be performed in what conditions? - Answer
There should be a minimum of excess air.
What type of oil burner is used when oil is supplied under high pressure? - Answer
Mechanical Atomizing Burner
An air atomizing compressor is usually what type? - Answer A rotary type.
Which of the following advantages does oil have over coal as a boiler fuel?
1. requires less storage space
2. costs less to handle
3. fuel quantity is easier to control
4. burns more cleanly - Answer All of the above
In a boiler burner with 3 fixed capacity nozzles,the intermediate and high burner nozzles have
higher capacities than the primary burner nozzle for what reason? - Answer To allow better
boiler warm-ups
What is a manometer used for? - Answer Measure draft
