Refrigeration Engineer License Exam Questions
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. The primary function of a refrigeration system is to
A. Produce heat
B. Transfer heat from a low-temperature area to a high-
temperature area
C. Destroy heat
D. Store cold air
Answer: B
Refrigeration works by removing heat from a cooler space and rejecting
it to a warmer environment.
2. Which component compresses low-pressure refrigerant vapor into
high-pressure vapor?
A. Condenser
B. Evaporator
C. Compressor
D. Expansion valve
Answer: C
The compressor raises refrigerant pressure and temperature to allow
heat rejection.
, 3. The condenser’s main purpose is to
A. Absorb heat
B. Meter refrigerant
C. Reject heat
D. Reduce pressure
Answer: C
The condenser releases heat absorbed in the evaporator plus
compressor heat.
4. Which device controls refrigerant flow into the evaporator?
A. Receiver
B. Compressor
C. Expansion valve
D. Oil separator
Answer: C
The expansion valve meters refrigerant and reduces pressure.
5. The evaporator functions by
A. Releasing heat to air
B. Absorbing heat from the conditioned space
C. Compressing refrigerant
D. Storing refrigerant
Answer: B
Heat is absorbed as liquid refrigerant boils in the evaporator.
, 6. Refrigerant changes from liquid to vapor in the
A. Condenser
B. Compressor
C. Receiver
D. Evaporator
Answer: D
Boiling occurs in the evaporator as heat is absorbed.
7. Which pressure side is considered the low side of the system?
A. Compressor discharge
B. Condenser outlet
C. Expansion valve outlet
D. Compressor suction
Answer: D
The suction line operates at low pressure.
8. Superheating occurs when refrigerant vapor
A. Contains liquid droplets
B. Is cooled below saturation temperature
C. Is heated above saturation temperature
D. Becomes liquid
Answer: C
Superheat ensures no liquid enters the compressor.
, 9. Subcooling refers to
A. Vapor cooling
B. Liquid refrigerant cooled below its saturation temperature
C. Pressure increase
D. Flash gas formation
Answer: B
Subcooling prevents flashing before the expansion device.
10. Which refrigerant safety classification indicates low toxicity
and no flame propagation?
A. A3
B. B2
C. A1
D. B3
Answer: C
A1 refrigerants are nonflammable with low toxicity.
11. Which oil is commonly used with HFC refrigerants?
A. Mineral oil
B. Alkylbenzene
C. POE oil
D. Silicone oil
Answer: C
Polyolester (POE) oil is compatible with HFC refrigerants.
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. The primary function of a refrigeration system is to
A. Produce heat
B. Transfer heat from a low-temperature area to a high-
temperature area
C. Destroy heat
D. Store cold air
Answer: B
Refrigeration works by removing heat from a cooler space and rejecting
it to a warmer environment.
2. Which component compresses low-pressure refrigerant vapor into
high-pressure vapor?
A. Condenser
B. Evaporator
C. Compressor
D. Expansion valve
Answer: C
The compressor raises refrigerant pressure and temperature to allow
heat rejection.
, 3. The condenser’s main purpose is to
A. Absorb heat
B. Meter refrigerant
C. Reject heat
D. Reduce pressure
Answer: C
The condenser releases heat absorbed in the evaporator plus
compressor heat.
4. Which device controls refrigerant flow into the evaporator?
A. Receiver
B. Compressor
C. Expansion valve
D. Oil separator
Answer: C
The expansion valve meters refrigerant and reduces pressure.
5. The evaporator functions by
A. Releasing heat to air
B. Absorbing heat from the conditioned space
C. Compressing refrigerant
D. Storing refrigerant
Answer: B
Heat is absorbed as liquid refrigerant boils in the evaporator.
, 6. Refrigerant changes from liquid to vapor in the
A. Condenser
B. Compressor
C. Receiver
D. Evaporator
Answer: D
Boiling occurs in the evaporator as heat is absorbed.
7. Which pressure side is considered the low side of the system?
A. Compressor discharge
B. Condenser outlet
C. Expansion valve outlet
D. Compressor suction
Answer: D
The suction line operates at low pressure.
8. Superheating occurs when refrigerant vapor
A. Contains liquid droplets
B. Is cooled below saturation temperature
C. Is heated above saturation temperature
D. Becomes liquid
Answer: C
Superheat ensures no liquid enters the compressor.
, 9. Subcooling refers to
A. Vapor cooling
B. Liquid refrigerant cooled below its saturation temperature
C. Pressure increase
D. Flash gas formation
Answer: B
Subcooling prevents flashing before the expansion device.
10. Which refrigerant safety classification indicates low toxicity
and no flame propagation?
A. A3
B. B2
C. A1
D. B3
Answer: C
A1 refrigerants are nonflammable with low toxicity.
11. Which oil is commonly used with HFC refrigerants?
A. Mineral oil
B. Alkylbenzene
C. POE oil
D. Silicone oil
Answer: C
Polyolester (POE) oil is compatible with HFC refrigerants.
