Alabama Refrigeration Contractor Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. What is the primary purpose of a refrigeration system?
A. To increase humidity
B. To remove heat from a controlled space
C. To generate electricity
D. To compress air
Answer: To remove heat from a controlled space
Rationale: Refrigeration systems are designed to transfer heat from a low-
temperature area to a higher-temperature area.
2. Which refrigerant property is most important for safety?
A. Color
B. Toxicity and flammability
C. Odor
D. Pressure only
,Answer: Toxicity and flammability
Rationale: Safe refrigerants must have low toxicity and low flammability to
reduce hazards during leaks or service.
3. What device controls refrigerant flow into the evaporator?
A. Compressor
B. Expansion valve
C. Condenser fan
D. Receiver
Answer: Expansion valve
Rationale: The expansion valve meters refrigerant into the evaporator based on
cooling demand.
4. What is the function of the compressor?
A. Absorb heat
B. Reduce pressure and temperature
C. Circulate and compress refrigerant
D. Store refrigerant
Answer: Circulate and compress refrigerant
Rationale: The compressor increases refrigerant pressure and moves it through
the system.
5. Which component rejects heat to the environment?
A. Evaporator
B. Compressor
C. Condenser
D. Metering device
Answer: Condenser
Rationale: The condenser releases absorbed heat to the surrounding air or water.
, 6. What is superheat?
A. Liquid refrigerant below freezing
B. Vapor above its saturation temperature
C. Oil temperature rise
D. Condenser heat
Answer: Vapor above its saturation temperature
Rationale: Superheat ensures only vapor enters the compressor.
7. What is subcooling?
A. Cooling vapor below boiling point
B. Cooling liquid below its condensation temperature
C. Heating refrigerant gas
D. Compressing gas
Answer: Cooling liquid below its condensation temperature
Rationale: Subcooling improves system efficiency and prevents flashing.
8. Which tool is used to check system pressures?
A. Thermometer
B. Manifold gauge set
C. Clamp meter
D. Psychrometer
Answer: Manifold gauge set
Rationale: It measures both high and low-side refrigerant pressures.
9. What is the main cause of compressor slugging?
A. Too much superheat
B. Liquid refrigerant entering compressor
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. What is the primary purpose of a refrigeration system?
A. To increase humidity
B. To remove heat from a controlled space
C. To generate electricity
D. To compress air
Answer: To remove heat from a controlled space
Rationale: Refrigeration systems are designed to transfer heat from a low-
temperature area to a higher-temperature area.
2. Which refrigerant property is most important for safety?
A. Color
B. Toxicity and flammability
C. Odor
D. Pressure only
,Answer: Toxicity and flammability
Rationale: Safe refrigerants must have low toxicity and low flammability to
reduce hazards during leaks or service.
3. What device controls refrigerant flow into the evaporator?
A. Compressor
B. Expansion valve
C. Condenser fan
D. Receiver
Answer: Expansion valve
Rationale: The expansion valve meters refrigerant into the evaporator based on
cooling demand.
4. What is the function of the compressor?
A. Absorb heat
B. Reduce pressure and temperature
C. Circulate and compress refrigerant
D. Store refrigerant
Answer: Circulate and compress refrigerant
Rationale: The compressor increases refrigerant pressure and moves it through
the system.
5. Which component rejects heat to the environment?
A. Evaporator
B. Compressor
C. Condenser
D. Metering device
Answer: Condenser
Rationale: The condenser releases absorbed heat to the surrounding air or water.
, 6. What is superheat?
A. Liquid refrigerant below freezing
B. Vapor above its saturation temperature
C. Oil temperature rise
D. Condenser heat
Answer: Vapor above its saturation temperature
Rationale: Superheat ensures only vapor enters the compressor.
7. What is subcooling?
A. Cooling vapor below boiling point
B. Cooling liquid below its condensation temperature
C. Heating refrigerant gas
D. Compressing gas
Answer: Cooling liquid below its condensation temperature
Rationale: Subcooling improves system efficiency and prevents flashing.
8. Which tool is used to check system pressures?
A. Thermometer
B. Manifold gauge set
C. Clamp meter
D. Psychrometer
Answer: Manifold gauge set
Rationale: It measures both high and low-side refrigerant pressures.
9. What is the main cause of compressor slugging?
A. Too much superheat
B. Liquid refrigerant entering compressor
