Alberta Refrigeration And Air Conditioning Mechanic Apprenticeship Certification Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Alberta Refrigeration And Air Conditioning
Mechanic Apprenticeship Certification Exam Questions And
Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which refrigerant is considered an ozone-depleting substance?
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A) R-410A
B) R-134a
C) R-22
D) R-407C
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) that contributes
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gto ozone depletion.
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2. What is the purpose of the expansion device in a refrigeration system?
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A) Increase refrigerant pressure g g



B) Heat the refrigerantg g



C) Reduce refrigerant pressure and control flow
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D) Compress the refrigerant g g



Rationale: The expansion device lowers refrigerant pressure to allow
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gproper heat absorption in the evaporator.
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3. In a vapor-compression system, the component that removes heat
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g from the refrigerant and rejects it to the atmosphere is the:
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A) Evaporator
B) Expansion valve g

, C) Compressor
D) Condenser
Rationale: The condenser releases heat absorbed in the evaporator
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to the surrounding air or water.
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4. A subcooling measurement is taken to:
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A) Determine suction pressure g g



B) Verify the refrigerant is fully condensed
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C) Measure superheat g



D) Check compressor efficiency
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Rationale: Subcooling ensures the refrigerant is completely in liquid
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state before reaching the expansion device.
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5. Which gas is commonly used for leak detection in HVAC systems?
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A) Oxygen
B) Nitrogen
C) Carbon monoxide g



D) Helium
Rationale: Nitrogen is inert and safe for pressurizing systems to check
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for leaks.
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6. The primary function of a compressor is to:
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A) Evaporate refrigerant g



B) Condense refrigerant g



C) Increase refrigerant pressure and temperature
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D) Expand refrigerant g



Rationale: Compressors raise the pressure and temperature of
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refrigerant vapor to allow heat rejection in the condenser.
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7. What is the typical operating pressure of R-410A in residential air
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conditioning systems?
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A) 50–100 psi g



B) 100–150 psi g

, C) 200–400 psi g



D) 450–600 psi g



Rationale: R-410A operates at higher pressures than R-22, often in
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the 200–400 psi range for residential units.
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8. Which type of compressor uses pistons to compress refrigerant?
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A) Scroll
B) Reciprocating
C) Centrifugal
D) Rotary
Rationale: Reciprocating compressors use pistons in cylinders to
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gcompress refrigerant. g




9. In refrigeration, superheat refers to:
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A) Refrigerant below its boiling point g g g g



B) Temperature of refrigerant vapor above its saturation temperature
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C) Refrigerant condensed in the condenser g g g g



D) Refrigerant at expansion valve inlet g g g g



Rationale: Superheat measures how much vapor temperature is
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gabove its saturation point at the evaporator outlet.
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10. Which of the following is a safety device installed to prevent
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overpressure in a refrigeration system?
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A) Thermostat
B) Filter drier g



C) Sight glass g



D) Relief valve g



Rationale: Relief valves protect equipment from excessive pressure
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by releasing refrigerant when limits are exceeded.
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11. What is the primary purpose of a filter-drier in a refrigeration
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system?
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A) Increase refrigerant pressure g g