ABSA: 4th Class Part B - Comprehensive Exam Questions with Verified Answers | Latest 2025/2026.

ABSA: 4th Class Part B - Comprehensive Exam Questions with
ABSA: 4th Class Part B - Comprehensive Exam 4
VerifiedStudyAnswers | Latest 2025/2026.
online at https://quizlet.com/_f6soot

1. One of the legal responsibilities of the engineer dur- b
ing an inspection is:
Select one:

a. To notify the Workers Compensation Board of the
inspection
b. Point out any known or suspected defects to the
inspector
c. To have at least two staff members present at all
times
d. To be in possession of an inspection certificate

2. The _____ tubes of a fired hot oil heater have fins on c
their outer surfaces.
Select one:

a. Water
b. Radiant
c. Extended type
d. Fire

3. The injection pump of a diesel engine is driven by: a
Select one:

a. A camshaft
b. The governor
c. The gudgeon pin
d. Piston action

4. Ammonia, as well as being toxic, is also: b
Select one:

a. A low pressure refrigerant


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b. Flammable
c. Miscible with oil
d. Odourless

5. When a boiler primes, it means that: b
Select one:

a. The steam vent is open, to allow it to fill
b. Water is being carried over with the steam
c. The boiler is being over fired
d. The water has not been chemically treated

6. The slide valve of a steam engine is designed to: a
Select one:

a. Allow steam to enter and leave the cylinder
b. Prevent the engine from over-speeding
c. Provide lubrication for the steam engine
d. Drain the condensate from the cylinder during
warm-up

7. A journal bearing: a
Select one:

a. Supports a shaft
b. require cooling water
c. Does not require lubrication
d. Controls thrust movement

8. Smaller spark ignition engine use ____________ to a
vapourize gasoline:
Select one:




, ABSA: 4th Class Part B - Comprehensive Exam 4
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a. Carburetion
b. Atomization
c. Electric heaters
d. Vapourizers

9. Heat load from people in a room is mostly affected by: b
Select one:

a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people

10. Testing a safety valve on a boiler by pulling the a
try-lever
Select one:

a. Ensures the valve is free to operate
b. Takes approximately two seconds
c. Ensures the closing pressure is correct
d. Ensures the popping pressure is correct

11. The ______________ is a type of unitary air conditioning b
system that uses a direct expansion refrigeration sys-
tem to provide cooling and dehumidification, without
using ductwork.
Select one:

a. Rooftop unit
b. Window air conditioner
c. Multi-zone system
d. Unit ventilator




, ABSA: 4th Class Part B - Comprehensive Exam 4
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12. The property of oil that indicates its ability to support a
a load is:
Select one:

a. Viscosity
b. Viscosity index
c. Pour point
d. Floc point

13. The inner walls and floor of a fired heater furnace are b
lined with:
Select one:

a. Ceramic tile
b. Refractory
c. Asbestos blocks
d. Fiberglass insulation

14. A collar thrust bearing: a
Select one:

a. Has boundary lubrication
b. Is used with steam turbines only
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bear-
ing

15. With regard to hot oil leaving the heater, the operating b
parameter of particular importance is the oil:
Select one:

a. Viscosity
b. Temperature