ABSA 5th Class Exam Practice Newest 2026
Questions and Correct Detailed Answers Already
Graded A+
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 - CORRECT 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? -
CORRECT ANSWER-To allow better boiler warm-ups
What is a manometer used for? - CORRECT ANSWER-Measure draft
A draft gauge on a furnace indicates the draft in: - CORRECT ANSWER-mm of
water column
,A solenoid type fuel gas valve is held close by what? - CORRECT ANSWER-Fuel
pressure
Regarding a burner with 3 fixed capacity nozzles,the secondary and tertiary
nozzles are ignited by: - CORRECT ANSWER-Primary burner
Ethane is a component of natural gas and constitutes a percent volume of: -
CORRECT ANSWER-10-20%
An interrupted pilot does what? - CORRECT ANSWER-Lights, completes a trial,
and extinguishes after the main flame is established.
Where are the return openings located regarding air distribution systems? -
CORRECT 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? - CORRECT 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 - CORRECT ANSWER-1, 3, 5
Carbon, which is not combined with hydrogen, is referred to as: - CORRECT
ANSWER-Fixed Carbon
Maximum static pressure in a fuel oil line is approximately: - CORRECT
ANSWER-35 kPa
Combustion of a fuel in a boiler furnace: - CORRECT ANSWER-should be
performed with a minimum of excess air
What is a hydrostatic test? - CORRECT 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? - CORRECT 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 - CORRECT ANSWER-3, 4
In hot water boiler operation the maximum operating temperature should never
exceed: - CORRECT ANSWER-121 degrees celsius
Questions and Correct Detailed Answers Already
Graded A+
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 - CORRECT 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? -
CORRECT ANSWER-To allow better boiler warm-ups
What is a manometer used for? - CORRECT ANSWER-Measure draft
A draft gauge on a furnace indicates the draft in: - CORRECT ANSWER-mm of
water column
,A solenoid type fuel gas valve is held close by what? - CORRECT ANSWER-Fuel
pressure
Regarding a burner with 3 fixed capacity nozzles,the secondary and tertiary
nozzles are ignited by: - CORRECT ANSWER-Primary burner
Ethane is a component of natural gas and constitutes a percent volume of: -
CORRECT ANSWER-10-20%
An interrupted pilot does what? - CORRECT ANSWER-Lights, completes a trial,
and extinguishes after the main flame is established.
Where are the return openings located regarding air distribution systems? -
CORRECT 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? - CORRECT 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 - CORRECT ANSWER-1, 3, 5
Carbon, which is not combined with hydrogen, is referred to as: - CORRECT
ANSWER-Fixed Carbon
Maximum static pressure in a fuel oil line is approximately: - CORRECT
ANSWER-35 kPa
Combustion of a fuel in a boiler furnace: - CORRECT ANSWER-should be
performed with a minimum of excess air
What is a hydrostatic test? - CORRECT 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? - CORRECT 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 - CORRECT ANSWER-3, 4
In hot water boiler operation the maximum operating temperature should never
exceed: - CORRECT ANSWER-121 degrees celsius
