Refrigeration Engineer License Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary function of a refrigeration compressor?
a) Absorb heat from the evaporator
b) Increase the pressure and temperature of the refrigerant vapor
c) Condense the refrigerant
d) Control refrigerant flow
Rationale: The compressor’s main role is to compress low-pressure
vapor into high-pressure vapor, enabling heat rejection in the
condenser.
2. Which type of refrigerant is classified as a CFC?
a) R-22
, b) R-12
c) R-134a
d) R-410A
Rationale: R-12 is a chlorofluorocarbon (CFC) known for ozone
depletion potential.
3. What happens to the refrigerant in the condenser?
a) It evaporates
b) It condenses from vapor to liquid
c) It expands
d) It is compressed
Rationale: The condenser rejects heat to the surroundings,
converting vapor refrigerant into liquid form.
4. What is the primary purpose of the expansion valve?
a) Increase refrigerant pressure
b) Raise refrigerant temperature
c) Reduce pressure and control refrigerant flow
d) Prevent compressor flooding
Rationale: The expansion valve throttles refrigerant, reducing its
pressure and controlling flow to the evaporator.
,5. Which of the following refrigerants has the lowest ozone depletion
potential?
a) R-22
b) R-12
c) R-134a
d) R-500
Rationale: R-134a is an HFC refrigerant with zero ozone depletion
potential.
6. What type of heat transfer occurs in the evaporator?
a) Conduction
b) Convection
c) Radiation
d) Compression
Rationale: Convection occurs as air passes over the evaporator coil,
transferring heat to the refrigerant.
7. What is superheat?
a) The temperature difference between the evaporator coil and air
b) The temperature of vapor above its saturation temperature
c) The refrigerant liquid temperature below boiling point
d) The pressure difference between suction and discharge
, Rationale: Superheat measures how much vapor has been heated
beyond its boiling point at a given pressure.
8. What component prevents liquid refrigerant from entering the
compressor?
a) Condenser
b) Capillary tube
c) Accumulator
d) Receiver
Rationale: The accumulator stores excess liquid refrigerant to ensure
only vapor reaches the compressor.
9. What is subcooling?
a) The temperature difference between the evaporator and condenser
b) Cooling a liquid refrigerant below its condensing temperature
c) Warming vapor above boiling point
d) Reducing suction pressure
Rationale: Subcooling ensures the refrigerant remains a liquid before
expansion, improving system efficiency.
10. Which pressure is measured at the compressor suction line?
a) Low-side pressure
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary function of a refrigeration compressor?
a) Absorb heat from the evaporator
b) Increase the pressure and temperature of the refrigerant vapor
c) Condense the refrigerant
d) Control refrigerant flow
Rationale: The compressor’s main role is to compress low-pressure
vapor into high-pressure vapor, enabling heat rejection in the
condenser.
2. Which type of refrigerant is classified as a CFC?
a) R-22
, b) R-12
c) R-134a
d) R-410A
Rationale: R-12 is a chlorofluorocarbon (CFC) known for ozone
depletion potential.
3. What happens to the refrigerant in the condenser?
a) It evaporates
b) It condenses from vapor to liquid
c) It expands
d) It is compressed
Rationale: The condenser rejects heat to the surroundings,
converting vapor refrigerant into liquid form.
4. What is the primary purpose of the expansion valve?
a) Increase refrigerant pressure
b) Raise refrigerant temperature
c) Reduce pressure and control refrigerant flow
d) Prevent compressor flooding
Rationale: The expansion valve throttles refrigerant, reducing its
pressure and controlling flow to the evaporator.
,5. Which of the following refrigerants has the lowest ozone depletion
potential?
a) R-22
b) R-12
c) R-134a
d) R-500
Rationale: R-134a is an HFC refrigerant with zero ozone depletion
potential.
6. What type of heat transfer occurs in the evaporator?
a) Conduction
b) Convection
c) Radiation
d) Compression
Rationale: Convection occurs as air passes over the evaporator coil,
transferring heat to the refrigerant.
7. What is superheat?
a) The temperature difference between the evaporator coil and air
b) The temperature of vapor above its saturation temperature
c) The refrigerant liquid temperature below boiling point
d) The pressure difference between suction and discharge
, Rationale: Superheat measures how much vapor has been heated
beyond its boiling point at a given pressure.
8. What component prevents liquid refrigerant from entering the
compressor?
a) Condenser
b) Capillary tube
c) Accumulator
d) Receiver
Rationale: The accumulator stores excess liquid refrigerant to ensure
only vapor reaches the compressor.
9. What is subcooling?
a) The temperature difference between the evaporator and condenser
b) Cooling a liquid refrigerant below its condensing temperature
c) Warming vapor above boiling point
d) Reducing suction pressure
Rationale: Subcooling ensures the refrigerant remains a liquid before
expansion, improving system efficiency.
10. Which pressure is measured at the compressor suction line?
a) Low-side pressure
