ABSA 5th Class Exam Questions And
Answers
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
,ABSA 5th Class Exam Questions And
Answers
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):
,ABSA 5th Class Exam Questions And
Answers
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
, ABSA 5th Class Exam Questions And
Answers
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
Answers
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
,ABSA 5th Class Exam Questions And
Answers
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):
,ABSA 5th Class Exam Questions And
Answers
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
, ABSA 5th Class Exam Questions And
Answers
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
