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100+ Free Red Seal Refrigeration & AC Mechanic Practice Questions

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2026 Statistics

Key Facts: Red Seal Refrigeration & AC Mechanic Exam

100

Practice Questions

OpenExamPrep

125

Exam Questions

Red Seal

4 hours

Time Limit

Red Seal

70%

Passing Score

Red Seal

~$100-170 CAD

Exam Fee (by province)

Provincial apprenticeship authorities

Interprovincial

Red Seal Endorsement

Red Seal Program

The Red Seal Refrigeration and Air Conditioning Mechanic exam is the interprovincial (IP) certification for journeyperson refrigeration and HVAC mechanics in Canada, administered through the Red Seal Program and provincial apprenticeship authorities. It consists of 125 four-option multiple-choice questions written over a maximum of four hours, with a 70% passing score. Content spans occupational safety and refrigerant handling (recovery, ODP/GWP, CSA B52), refrigeration-cycle thermodynamics and drawings, system components, air conditioning and heat pumps, electrical and controls, and commissioning, service, and troubleshooting. Exam fees are set by each province and typically run about $100-170 CAD per attempt. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample Red Seal Refrigeration & AC Mechanic Practice Questions

Try these sample questions to test your Red Seal Refrigeration & AC Mechanic exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under Canada's Environmental Code of Practice for the elimination of fluorocarbon emissions, what is the primary reason a technician must recover refrigerant rather than venting it to atmosphere when opening a system?
A.To keep the refrigerant clean for reuse only
B.To prevent ozone depletion and greenhouse-gas emissions
C.To reduce noise during service
D.To increase compressor oil return
Explanation: Halocarbon refrigerants are regulated because they cause stratospheric ozone depletion (ODP) and/or contribute to global warming (GWP). The Code of Practice and provincial regulations require recovery, not venting, to prevent these atmospheric emissions.
2A refrigerant with an Ozone Depletion Potential (ODP) of zero but a high Global Warming Potential (GWP), such as R-410A, is best classified as which type?
A.CFC (chlorofluorocarbon)
B.HCFC (hydrochlorofluorocarbon)
C.HFC (hydrofluorocarbon)
D.HFO (hydrofluoroolefin)
Explanation: HFCs such as R-410A and R-134a contain no chlorine, so their ODP is zero, but many have a high GWP (R-410A is about 2,088). CFCs and HCFCs contain chlorine and have a non-zero ODP.
3According to the Environmental Code of Practice, a recovery cylinder used at a normal shop ambient of about 21 degrees C should not be filled beyond what percentage of its maximum net weight capacity?
A.50%
B.60%
C.80%
D.95%
Explanation: Recovery cylinders must not be overfilled because liquid refrigerant expands with temperature. The Code limits fill to about 80% of maximum net weight at normal ambient (around 21 C) to leave a vapour space and prevent hydrostatic rupture.
4Which Canadian standard is the Mechanical Refrigeration Code that governs the design, construction, and installation of refrigeration systems, including machinery rooms?
A.CSA B149.1
B.CSA B52
C.CSA B139
D.CSA C22.1
Explanation: CSA B52, the Mechanical Refrigeration Code, sets requirements for refrigeration system design, refrigerant safety groups, machinery rooms, relief devices, and leak detection. It is the governing refrigeration safety code in Canada.
5In the ASHRAE/CSA refrigerant safety classification system, what does a designation of 'A1' indicate?
A.Higher toxicity, no flame propagation
B.Lower toxicity, no flame propagation
C.Lower toxicity, higher flammability
D.Higher toxicity, higher flammability
Explanation: The letter indicates toxicity (A = lower toxicity, B = higher toxicity) and the number indicates flammability (1 = no flame propagation, 2L = mildly flammable, 2 = flammable, 3 = highly flammable). A1 means lower toxicity with no flame propagation, like R-410A or R-134a.
6Ammonia (R-717) is classified in the ASHRAE safety group B2L. Which property combination does this represent?
A.Lower toxicity, non-flammable
B.Higher toxicity, mildly flammable
C.Lower toxicity, highly flammable
D.Higher toxicity, non-flammable
Explanation: Ammonia is group B2L: B indicates higher toxicity and 2L indicates mild (lower-burning-velocity) flammability. This is why ammonia plants require machinery rooms, ventilation, and gas detection under CSA B52.
7Before brazing or unsoldering a joint on a system that still contains refrigerant, what must a technician do first?
A.Pressurize the system with oxygen
B.Recover the refrigerant to a recovery cylinder
C.Add extra refrigerant to raise pressure
D.Run the compressor to circulate oil
Explanation: Heating a sealed joint that contains refrigerant can decompose it into toxic gases (such as phosgene from chlorinated refrigerants) and build dangerous pressure. The refrigerant must be recovered first to make the work safe and lawful.
8When pressure-testing a refrigeration system for leaks, which gas is recommended for building system pressure?
A.Oxygen
B.Acetylene
C.Dry nitrogen
D.Compressed shop air
Explanation: Dry (oil-free) nitrogen is inert, moisture-free, and does not react with refrigerant oils, making it the standard gas for pressure and leak testing. A trace of refrigerant may be added for electronic leak detection.
9A technician is flowing nitrogen through tubing while brazing copper joints. What is the main purpose of this practice?
A.To cool the joint faster
B.To prevent oxidation and scale forming inside the tube
C.To increase the brazing temperature
D.To detect leaks during brazing
Explanation: Purging with a small flow of nitrogen displaces oxygen so that copper oxide (black flaky scale) does not form on the inside of the tubing. Loose scale can contaminate the system and plug metering devices and filter-driers.
10What is the principal hazard of liquid refrigerant contacting unprotected skin?
A.Electric shock
B.Chemical burn from acidity
C.Frostbite from rapid evaporation
D.Radiation exposure
Explanation: Liquid refrigerant boils at a very low temperature, so it absorbs heat extremely fast as it flashes to vapour. Contact with skin causes near-instant freezing (frostbite), which is why gloves and eye protection are required when handling liquid refrigerant.

About the Red Seal Refrigeration & AC Mechanic Exam

The Red Seal Refrigeration and Air Conditioning Mechanic interprovincial exam certifies journeypersons who install, service, and repair refrigeration, air conditioning, and heat-pump systems. The exam has 125 four-option multiple-choice questions over a maximum of four hours and requires 70% to pass.

Assessment

125 four-option multiple-choice questions over a maximum of 4 hours on the Red Seal interprovincial exam, 70% to pass; this practice bank is 100 selected-response items

Time Limit

4 hours

Passing Score

70%

Exam Fee

Varies by province, typically ~$100-170 CAD per attempt (Employment and Social Development Canada / Red Seal Program (administered by provincial and territorial apprenticeship authorities))

Red Seal Refrigeration & AC Mechanic Exam Content Outline

14%

Safety, Codes & Refrigerant Handling

Refrigerant recovery and the environmental code of practice (ODP/GWP), CSA B52, refrigerant safety groups, machinery rooms, pressure relief, and PPE

12%

Drawings & Thermodynamics Fundamentals

Refrigeration cycle, P-h and P-T charts, latent/sensible heat, superheat and subcooling, COP, units, and reading schematic symbols

24%

Refrigeration Systems & Components

Compressors, condensers, evaporators, metering devices, receivers, accumulators, oil management, defrost, valves, piping, and charging

18%

Air Conditioning & Heat Pumps

Split, packaged, chilled-water and heat-pump systems, reversing valves, psychrometrics, airflow, efficiency ratings, A2L refrigerants, and condensate

20%

Electrical & Controls

Canadian Electrical Code wiring, motors and capacitors, contactors, pressure/temperature controls, overloads, sensors, and electrical safety

12%

Commissioning, Service & Troubleshooting

Evacuation and vacuum testing, leak detection, charge and restriction diagnosis, burnout cleanup, and functional verification

How to Pass the Red Seal Refrigeration & AC Mechanic Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 125 four-option multiple-choice questions over a maximum of 4 hours on the Red Seal interprovincial exam, 70% to pass; this practice bank is 100 selected-response items
  • Time limit: 4 hours
  • Exam fee: Varies by province, typically ~$100-170 CAD per attempt

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Red Seal Refrigeration & AC Mechanic Study Tips from Top Performers

1Weight your study toward refrigeration systems/components, electrical/controls, and air conditioning/heat pumps — together they are the bulk of the exam
2Master the pressure-temperature relationship: practise reading P-T charts and calculating superheat (low-side) and subcooling (high-side)
3Know your codes: refrigerant recovery and the environmental code of practice, CSA B52 mechanical refrigeration code, and Canadian Electrical Code (CSA C22.1) wiring rules
4Memorize key numbers: 1 ton = 12,000 BTU/h (~3.5 kW), recovery-cylinder 80% fill at 21 C, deep-vacuum target around 500 microns
5Practise diagnosis logic: link undercharge, overcharge, restrictions, non-condensables, and dirty coils to their pressure, superheat, and subcooling signatures
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the Red Seal Refrigeration and Air Conditioning Mechanic exam and how long is it?

The interprovincial exam has 125 four-option multiple-choice questions and you have a maximum of four hours to complete it. You need 70% to pass.

What score do I need to pass the Red Seal refrigeration exam?

You need 70% to earn the Red Seal endorsement on the Refrigeration and Air Conditioning Mechanic exam. Because the exam covers safety, thermodynamics, systems, air conditioning, electrical controls, and service, balanced study across every block is important.

Who is eligible to write the Red Seal refrigeration exam?

Candidates must complete a refrigeration and air conditioning mechanic apprenticeship (typically about four years of required hours) or qualify as a trade-qualified worker, and be approved to challenge the interprovincial exam by their provincial or territorial apprenticeship authority.

What topics does the Red Seal refrigeration exam cover?

It covers occupational safety and refrigerant handling (recovery, ODP/GWP, CSA B52), refrigeration-cycle thermodynamics and drawings, system components, air conditioning and heat pumps, electrical and controls, and commissioning, service, and troubleshooting.

How much does the Red Seal refrigeration exam cost?

Exam fees are set by each province or territory and typically run about $100-170 CAD per attempt. You register and pay through your provincial apprenticeship office, where retake rules also apply.

Is this free refrigeration practice as good as paid prep?

Our 100 practice questions cover the same content blocks as the Red Seal Occupational Standard, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.