ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
1. 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: b
2. 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: c
3. The injection pump of a diesel engine is driven by:
Select one:
a. A camshaft
b. The governor
c. The gudgeon pin
d. Piston action: a
4. Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless: b
5. 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
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
c. The boiler is being over fired
d. The water has not been chemically treated: b
6. The slide valve of a steam engine is designed to:
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: a
7. A journal bearing:
Select one:
a. Supports a shaft
b. require cooling water
c. Does not require lubrication
d. Controls thrust movement: a
8. Smaller spark ignition engine use to vapourize gasoline:
Select one:
a. Carburetion
b. Atomization
c. Electric heaters
d. Vapourizers: a
9. Heat load from people in a room is mostly affected by:
Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people: b
10. Testing a safety valve on a boiler by pulling the try-lever
Select one:
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
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: a
11. 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: b
12. The property of oil that indicates its ability to support a load is:
Select one:
a. Viscosity
b. Viscosity index
c. Pour point
d. Floc point: a
13. The inner walls and floor of a fired heater furnace are lined with:
Select one:
a. Ceramic tile
b. Refractory
c. Asbestos blocks
d. Fiberglass insulation: b
14. A collar thrust bearing:
Select one:
a. Has boundary lubrication
b. Is used with steam turbines only
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bearing: a
15. With regard to hot oil leaving the heater, the operating parameter of partic-
ular importance is the oil:
Select one:
a. Viscosity
b. Temperature
c. Velocity
d. Pressure: b
16. Buildings require heat sources to:
Select one:
a. Offset the building's heat losses
b. Replace the exhaust air
c. Replace the ventilation air
d. Offset the heat gain from the atmosphere: a
17. Grooving and general thinning of the condensate return system is a result
of:
Select one:
a. scale build-up
b. high alkalinity
c. oxygencorrosion
d. carbonic acid corrosion: d
18. Freezing problems in steam coils with long tube lengths, when heating large
amounts of low temperature outside air, can be minimized using
Select one:
a. An over-sized steam flow control valve.
b. A controller that fully closes the outside air dampers when the outside air
temperature drops to below freezing.
2026-2027
1. 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: b
2. 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: c
3. The injection pump of a diesel engine is driven by:
Select one:
a. A camshaft
b. The governor
c. The gudgeon pin
d. Piston action: a
4. Ammonia, as well as being toxic, is also:
Select one:
a. A low pressure refrigerant
b. Flammable
c. Miscible with oil
d. Odourless: b
5. 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
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
c. The boiler is being over fired
d. The water has not been chemically treated: b
6. The slide valve of a steam engine is designed to:
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: a
7. A journal bearing:
Select one:
a. Supports a shaft
b. require cooling water
c. Does not require lubrication
d. Controls thrust movement: a
8. Smaller spark ignition engine use to vapourize gasoline:
Select one:
a. Carburetion
b. Atomization
c. Electric heaters
d. Vapourizers: a
9. Heat load from people in a room is mostly affected by:
Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people: b
10. Testing a safety valve on a boiler by pulling the try-lever
Select one:
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
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: a
11. 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: b
12. The property of oil that indicates its ability to support a load is:
Select one:
a. Viscosity
b. Viscosity index
c. Pour point
d. Floc point: a
13. The inner walls and floor of a fired heater furnace are lined with:
Select one:
a. Ceramic tile
b. Refractory
c. Asbestos blocks
d. Fiberglass insulation: b
14. A collar thrust bearing:
Select one:
a. Has boundary lubrication
b. Is used with steam turbines only
,ABSA-4th Class Part B - Comprehensive Exam 4 questions with correct verified answers
2026-2027
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bearing: a
15. With regard to hot oil leaving the heater, the operating parameter of partic-
ular importance is the oil:
Select one:
a. Viscosity
b. Temperature
c. Velocity
d. Pressure: b
16. Buildings require heat sources to:
Select one:
a. Offset the building's heat losses
b. Replace the exhaust air
c. Replace the ventilation air
d. Offset the heat gain from the atmosphere: a
17. Grooving and general thinning of the condensate return system is a result
of:
Select one:
a. scale build-up
b. high alkalinity
c. oxygencorrosion
d. carbonic acid corrosion: d
18. Freezing problems in steam coils with long tube lengths, when heating large
amounts of low temperature outside air, can be minimized using
Select one:
a. An over-sized steam flow control valve.
b. A controller that fully closes the outside air dampers when the outside air
temperature drops to below freezing.
