Refrigeration Engineer License Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of refrigeration in HVAC systems?
A. To increase humidity
B. To remove heat from a space
C. To generate electricity
D. To compress air
Correct Answer: B
Rationale: Refrigeration systems function by removing heat from a controlled
space and rejecting it elsewhere.
2. Which law explains the relationship between pressure and temperature in a
sealed system?
A. Boyle’s Law
B. Ohm’s Law
C. Pascal’s Law
D. Newton’s Law
Correct Answer: A
Rationale: Boyle’s Law states pressure and volume are inversely related at
constant temperature.
, 3. What is the function of the evaporator coil?
A. Reject heat outdoors
B. Absorb heat from the conditioned space
C. Compress refrigerant
D. Store refrigerant
Correct Answer: B
Rationale: The evaporator absorbs heat, causing refrigerant to evaporate.
4. Which refrigerant property determines its boiling point?
A. Latent heat
B. Color
C. Electrical conductivity
D. Odor
Correct Answer: A
Rationale: Latent heat characteristics define phase change temperatures.
5. What component increases refrigerant pressure?
A. Expansion valve
B. Evaporator
C. Compressor
D. Receiver
Correct Answer: C
Rationale: The compressor raises refrigerant pressure and temperature.
6. What is superheat?
A. Liquid refrigerant below boiling point
B. Vapor above saturation temperature
, C. Pressure drop in condenser
D. Heat lost in compressor
Correct Answer: B
Rationale: Superheat is vapor heated beyond its saturation temperature.
7. What is the purpose of a metering device?
A. Increase pressure
B. Control refrigerant flow
C. Store oil
D. Remove moisture
Correct Answer: B
Rationale: Metering devices regulate refrigerant flow into the evaporator.
8. Which tool is used to measure system pressures?
A. Thermometer
B. Manifold gauge set
C. Psychrometer
D. Ammeter
Correct Answer: B
Rationale: Manifold gauges measure high and low-side pressures.
9. What happens when refrigerant is undercharged?
A. System efficiency increases
B. Evaporator starves
C. Condenser floods
D. Pressure increases
Correct Answer: B
Rationale: Low refrigerant charge reduces evaporator performance.
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of refrigeration in HVAC systems?
A. To increase humidity
B. To remove heat from a space
C. To generate electricity
D. To compress air
Correct Answer: B
Rationale: Refrigeration systems function by removing heat from a controlled
space and rejecting it elsewhere.
2. Which law explains the relationship between pressure and temperature in a
sealed system?
A. Boyle’s Law
B. Ohm’s Law
C. Pascal’s Law
D. Newton’s Law
Correct Answer: A
Rationale: Boyle’s Law states pressure and volume are inversely related at
constant temperature.
, 3. What is the function of the evaporator coil?
A. Reject heat outdoors
B. Absorb heat from the conditioned space
C. Compress refrigerant
D. Store refrigerant
Correct Answer: B
Rationale: The evaporator absorbs heat, causing refrigerant to evaporate.
4. Which refrigerant property determines its boiling point?
A. Latent heat
B. Color
C. Electrical conductivity
D. Odor
Correct Answer: A
Rationale: Latent heat characteristics define phase change temperatures.
5. What component increases refrigerant pressure?
A. Expansion valve
B. Evaporator
C. Compressor
D. Receiver
Correct Answer: C
Rationale: The compressor raises refrigerant pressure and temperature.
6. What is superheat?
A. Liquid refrigerant below boiling point
B. Vapor above saturation temperature
, C. Pressure drop in condenser
D. Heat lost in compressor
Correct Answer: B
Rationale: Superheat is vapor heated beyond its saturation temperature.
7. What is the purpose of a metering device?
A. Increase pressure
B. Control refrigerant flow
C. Store oil
D. Remove moisture
Correct Answer: B
Rationale: Metering devices regulate refrigerant flow into the evaporator.
8. Which tool is used to measure system pressures?
A. Thermometer
B. Manifold gauge set
C. Psychrometer
D. Ammeter
Correct Answer: B
Rationale: Manifold gauges measure high and low-side pressures.
9. What happens when refrigerant is undercharged?
A. System efficiency increases
B. Evaporator starves
C. Condenser floods
D. Pressure increases
Correct Answer: B
Rationale: Low refrigerant charge reduces evaporator performance.
