2026 4th Class Power Engineering Part B Exam Q&A – Boilers, Pumps, & Refrigeration

ABSA: 4th Class Part B - Comprehensive Exam 1
r. r. r. r. r. r. r. r.


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1. Temporary hardness in feedwater is caused by: r. r. r. r. r. r.



Select one: r.




a. Magnesium sulphate r.



b. Calcium carbonate r.



c. Magnesium bicarbonate r.



d. Sodium nitrate: c r . r .



2. What is the recommended boiler water pH for wet
r. r. r. r. r. r. r. r.



r.layup? Select one: r. r.




a. 10
b. 12
c. 7.5
d. 7: a r.



3. A photoelectric flame scanner:
r. r. r.



Select one: r.




a. Produces a steady voltage signal r. r. r. r.



b. Requires a clear line of sight to the flame r. r. r. r. r. r. r. r.



c. conducts current through the flame r. r. r. r.



d. uses a pilot-stat: b r. r. r.



4. Heavy oil recovered using SAGD or CSS is properly referred to as
r. r. r. r. r. r. r. r. r. r. r.



Select one:
r. r.




a. bottoms
b. crude
c. tar
d. bitumen: d r .



5. Humidifying units that force warm air through a wet pad, and return the air to
r. r. r. r. r. r. r. r. r. r. r. r. r. r.



the room, are called:
r. r. r. r.



Select one: r.




a. Wetted element humidifiers r . r .


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, ABSA: 4th Class Part B - Comprehensive Exam 1r. r. r. r. r. r. r. r.


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b. Pan type humidifiers with plates
r . r . r . r .



c. Atomizing humidifiers r.



d. Bypass type humidifiers: a r . r . r .



6. The kind of grease used for heavily loaded machinery operating at slow
r. r. r. r. r. r. r. r. r. r. r.



speeds is the:
r. r. r.



Select one:r.




a. Sodium base grease r. r.



b. Specialty grease r.



c. Calcium base grease r. r.



d. Aluminum base grease: b r . r . r .



7. One of the advantages of gas-fired infrared heating over other types of
r. r. r. r. r. r. r. r. r. r. r.



heating systems is:
r. r. r.



Select one:r.




a. Gas-fired infrared heaters can be used as the main heating source for a large
r. r. r. r. r. r. r. r. r. r. r. r. r.



building
r.



b. Gas-fired infrared heaters can provide effective spot heating
r. r. r. r. r. r. r.



c. Gas-fired infrared heaters require no fuel handling equipment
r . r . r . r . r . r . r .



d. Gas-fired infrared heaters can heat large volume enclosures with little fuel: b
r. r. r. r. r. r. r. r. r. r. r.



8. The normal loss of zeolite in a sodium zeolite softener is about
r. r. per r. r. r. r. r. r. r. r. r. r.



year.
r.



Select one:r.




a. 0.1
b. 0.15
c. 0.03
d. 0.05: c r.



9. A form of lubrication that requires continual motion of a shaft or surface is:
r. r. r. r. r. r. r. r. r. r. r. r. r.



Select one:
r. r.




a. Fluid film lubrication
r. r.




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, ABSA: 4th Class Part B - Comprehensive Exam 1
r. r. r. r. r. r. r. r.


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b. Forced lubrication r.



c. Continuous lubrication r.



d. Boundary lubrication: a r . r .



10. A r. is a fired heater installed where the heat is needed, that heats the
r. r. r. r. r. r. r. r. r. r. r. r.



air directly without the use of any ducting.
r. r. r. r. r. r. r. r.



Select one: r.




a. Rooftop unit r.



b. Unit ventilator r.



c. Convector
d. Unit heater: d r . r .



11. With antifriction bearings using grease, the bearings:
r. r. r. r. r. r.



Select one:
r. r.




a. Never require cleaning r. r.



b. Are cleaned less often than oil-lubricated bearings
r . r . r . r . r . r .



c. can be cleaned by adding solvent to the grease cartridge
r. r. r. r. r. r. r. r. r.



d. Must be cleaned twice as often as oil-lubricated bearings: b
r. r. r. r. r. r. r. r. r.



12. In a reaction turbine the steam
r. r. when passing through moving r. r. r. r. r. r. r.



blades.
r.



Select one: r.




a. Velocity decreases r.



b. Velocity remains constant r. r.



c. Pressure decreases r.



d. Pressure increases: c r. r.



13. Which one of these government agencies or regulations covers the use
r. r. r. r. r. r. r. r. r. r.



and erection of work platforms?
r. r. r. r. r.



Select one: r.




a. Provincial elevator and hoisting device inspection branch
r. r. r. r. r. r.



b. Industrial Accident Prevention Association r. r. r.




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, ABSA: 4th Class Part B - Comprehensive Exam 1 r. r. r. r. r. r. r. r.


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c. Occupational Health and Safety Act and Regulation r. r. r. r. r. r.



d. Boilers and Pressure Vessels Branch: c r. r. r. r. r.



14. An evaporator that can easily be cleaned and defrosted manually without
r. r. r. r. r. r. r. r. r. r.



interrupting the cooling process is which type of evaporator?
r. r. r. r. r. r. r. r. r.



Select one: r.




a. Shell and tube evaporator r. r. r.



b. Plate surface evaporator r. r.



c. Finned evaporator r.



d. Liquid recirculating evaporator: b r. r. r.



15. Air removal prior to a hydrostatic test:
r. r. r. r. r. r.



Select one: r.




a. Is critical, because the air will compress during the test
r. r. r. r. r. r. r. r. r.



b. Will prevent oxygen corrosion.
r. r. r.



c. Is done by adding oxygen scavenging chemicals to the test water.
r. r. r. r. r. r. r. r. r. r.



d. Is done with a vacuum pump.: a
r. r . r. r. r . r.



16. Rust in the gauge glass is an indication that:
r. r. r. r. r. r. r. r.



Select one:
r . r.




a. Corrosion is occurring in the system r. r. r. r. r.



b. The continuous blowdown setting needs to be increased.
r . r . r . r . r . r . r .



c. The dissolved solids concentration has peaked.
r. r. r. r. r.



d. The boiler should be blown off.: a
r. r. r. r. r. r.



17. The purpose of humidification is to:
r . r . r . r . r .



Select one: r.




a. Remove moisture from the air during the heating season r. r. r. r. r. r. r. r.



b. Remove moisture from the air during the cooling season r . r . r . r . r . r . r . r .



c. Add moisture to the air during the cooling season
r. r. r. r. r. r. r. r.



d. Add moisture to the air during the heating season: d
r. r. r. r. r. r. r. r. r.




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