ABSA 4th Class Part B Comprehensive Exam 4
– Complete Practice Questions & Answer
Review 2026
One of the legal responsibilities of the engineer during 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 - correct answers -b
The _____ tubes of a fired hot oil heater have fins on their outer surfaces.
Select one:
a. Water
b. Radiant
c. Extended type
d. Fire - correct answers -c
The injection pump of a diesel engine is driven by:
Select one:
1
,a. A camshaft
b. The governor
c. The gudgeon pin
d. Piston action - correct answers -a
Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless - correct answers -b
When a boiler primes, it means that:
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 - correct answers -b
The slide valve of a steam engine is designed to:
Select one:
2
,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 - correct answers -a
A journal bearing:
Select one:
a. Supports a shaft
b. require cooling water
c. Does not require lubrication
d. Controls thrust movement - correct answers -a
Smaller spark ignition engine use ____________ to vapourize gasoline:
Select one:
a. Carburetion
b. Atomization
c. Electric heaters
d. Vapourizers - correct answers -a
Heat load from people in a room is mostly affected by:
3
, Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people - correct answers -b
Testing a safety valve on a boiler by pulling the 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 - correct answers -a
The ______________ is a type of unitary air conditioning system that uses a direct expansion
refrigeration system to provide cooling and dehumidification, without using ductwork.
Select one:
a. Rooftop unit
b. Window air conditioner
c. Multi-zone system
d. Unit ventilator - correct answers -b
4
– Complete Practice Questions & Answer
Review 2026
One of the legal responsibilities of the engineer during 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 - correct answers -b
The _____ tubes of a fired hot oil heater have fins on their outer surfaces.
Select one:
a. Water
b. Radiant
c. Extended type
d. Fire - correct answers -c
The injection pump of a diesel engine is driven by:
Select one:
1
,a. A camshaft
b. The governor
c. The gudgeon pin
d. Piston action - correct answers -a
Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless - correct answers -b
When a boiler primes, it means that:
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 - correct answers -b
The slide valve of a steam engine is designed to:
Select one:
2
,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 - correct answers -a
A journal bearing:
Select one:
a. Supports a shaft
b. require cooling water
c. Does not require lubrication
d. Controls thrust movement - correct answers -a
Smaller spark ignition engine use ____________ to vapourize gasoline:
Select one:
a. Carburetion
b. Atomization
c. Electric heaters
d. Vapourizers - correct answers -a
Heat load from people in a room is mostly affected by:
3
, Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people - correct answers -b
Testing a safety valve on a boiler by pulling the 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 - correct answers -a
The ______________ is a type of unitary air conditioning system that uses a direct expansion
refrigeration system to provide cooling and dehumidification, without using ductwork.
Select one:
a. Rooftop unit
b. Window air conditioner
c. Multi-zone system
d. Unit ventilator - correct answers -b
4
