HOSMERIT
ABSA 5TH CLASS EXAM | QUESTIONS & ANSWERS
(VERIFIED) | LATEST UPDATE |GRADED A+
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 beless 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 requirelubrication?
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
A substance, which will absorb humidity inside a boiler during dry lay up is:
Correct Answer:
Activated alumina
When draft is produced by natural means:
Correct Answer:
cooler air surrounding the boiler increases draft
Coal is composed of the following combustible components:
Correct 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
Correct Answer:
3,4,5
Which grade of oil is the most popular for domestic and small commercial boilers?
Correct Answer:
Grade 2
The inclined manometer as compared to the U manometer is what?
Correct Answer:
More accurate.
How can the draft through a natural draft furnace be increased?
Correct Answer:
Increase the temperature of the stack
ABSA 5TH CLASS EXAM | QUESTIONS & ANSWERS
(VERIFIED) | LATEST UPDATE |GRADED A+
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 beless 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 requirelubrication?
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
A substance, which will absorb humidity inside a boiler during dry lay up is:
Correct Answer:
Activated alumina
When draft is produced by natural means:
Correct Answer:
cooler air surrounding the boiler increases draft
Coal is composed of the following combustible components:
Correct 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
Correct Answer:
3,4,5
Which grade of oil is the most popular for domestic and small commercial boilers?
Correct Answer:
Grade 2
The inclined manometer as compared to the U manometer is what?
Correct Answer:
More accurate.
How can the draft through a natural draft furnace be increased?
Correct Answer:
Increase the temperature of the stack
