AL REF REFRIGERATION CONTRACTOR EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary function of a refrigeration system?
A. To create cold air
B. To transfer heat from a lower-temperature space to a higher-
temperature location
C. To generate electricity
D. To increase humidity
Rationale: Refrigeration does not actually create "cold"; it
removes heat from the conditioned space and rejects it
elsewhere.
Correct answer: B. To transfer heat from a lower-temperature
space to a higher-temperature location
2. Which component raises the pressure and temperature of
refrigerant vapor?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Rationale: The compressor receives low-pressure vapor and
compresses it into high-pressure, high-temperature vapor.
Correct answer: C. Compressor
,3. What is the primary function of the evaporator?
A. Reject heat
B. Absorb heat
C. Increase refrigerant pressure
D. Store oil
Rationale: Refrigerant absorbs heat from the refrigerated space
while evaporating inside the evaporator.
Correct answer: B. Absorb heat
4. What occurs in the condenser?
A. Refrigerant absorbs heat and evaporates
B. Refrigerant rejects heat and condenses
C. Refrigerant pressure drops to zero
D. Refrigerant is mixed with air
Rationale: High-pressure refrigerant vapor releases heat to the
surrounding environment and changes into liquid.
Correct answer: B. Refrigerant rejects heat and condenses
5. What is the purpose of an expansion device?
A. Increase refrigerant pressure
B. Reduce refrigerant pressure
C. Increase compressor speed
D. Remove compressor oil
,Rationale: The expansion device creates a pressure drop before
the evaporator, allowing refrigerant to evaporate at a lower
temperature.
Correct answer: B. Reduce refrigerant pressure
6. Which refrigerant state normally enters the compressor?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Solid refrigerant
Rationale: Compressors are designed to compress vapor. Liquid
entering the compressor can cause serious mechanical damage.
Correct answer: B. Low-pressure vapor
7. Which condition is commonly called liquid slugging?
A. Oil leaving the condenser
B. Liquid refrigerant entering the compressor
C. Vapor entering the evaporator
D. Air entering the condenser
Rationale: Liquid refrigerant is essentially incompressible and
can damage compressor components when it enters in
significant quantities.
Correct answer: B. Liquid refrigerant entering the compressor
, 8. What instrument is commonly used to measure refrigerant
system pressures?
A. Megohmmeter
B. Manifold gauge set
C. Tachometer
D. Hydrometer
Rationale: A refrigeration manifold gauge set allows the
technician to monitor system pressure on the appropriate
service ports.
Correct answer: B. Manifold gauge set
9. What does superheat represent?
A. Temperature of liquid below saturation
B. Temperature of vapor above its saturation temperature
C. Condenser pressure
D. Compressor horsepower
Rationale: Superheat is the amount by which a vapor's actual
temperature exceeds its saturation temperature at a given
pressure.
Correct answer: B. Temperature of vapor above its saturation
temperature
10. What does subcooling describe?
A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary function of a refrigeration system?
A. To create cold air
B. To transfer heat from a lower-temperature space to a higher-
temperature location
C. To generate electricity
D. To increase humidity
Rationale: Refrigeration does not actually create "cold"; it
removes heat from the conditioned space and rejects it
elsewhere.
Correct answer: B. To transfer heat from a lower-temperature
space to a higher-temperature location
2. Which component raises the pressure and temperature of
refrigerant vapor?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Rationale: The compressor receives low-pressure vapor and
compresses it into high-pressure, high-temperature vapor.
Correct answer: C. Compressor
,3. What is the primary function of the evaporator?
A. Reject heat
B. Absorb heat
C. Increase refrigerant pressure
D. Store oil
Rationale: Refrigerant absorbs heat from the refrigerated space
while evaporating inside the evaporator.
Correct answer: B. Absorb heat
4. What occurs in the condenser?
A. Refrigerant absorbs heat and evaporates
B. Refrigerant rejects heat and condenses
C. Refrigerant pressure drops to zero
D. Refrigerant is mixed with air
Rationale: High-pressure refrigerant vapor releases heat to the
surrounding environment and changes into liquid.
Correct answer: B. Refrigerant rejects heat and condenses
5. What is the purpose of an expansion device?
A. Increase refrigerant pressure
B. Reduce refrigerant pressure
C. Increase compressor speed
D. Remove compressor oil
,Rationale: The expansion device creates a pressure drop before
the evaporator, allowing refrigerant to evaporate at a lower
temperature.
Correct answer: B. Reduce refrigerant pressure
6. Which refrigerant state normally enters the compressor?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Solid refrigerant
Rationale: Compressors are designed to compress vapor. Liquid
entering the compressor can cause serious mechanical damage.
Correct answer: B. Low-pressure vapor
7. Which condition is commonly called liquid slugging?
A. Oil leaving the condenser
B. Liquid refrigerant entering the compressor
C. Vapor entering the evaporator
D. Air entering the condenser
Rationale: Liquid refrigerant is essentially incompressible and
can damage compressor components when it enters in
significant quantities.
Correct answer: B. Liquid refrigerant entering the compressor
, 8. What instrument is commonly used to measure refrigerant
system pressures?
A. Megohmmeter
B. Manifold gauge set
C. Tachometer
D. Hydrometer
Rationale: A refrigeration manifold gauge set allows the
technician to monitor system pressure on the appropriate
service ports.
Correct answer: B. Manifold gauge set
9. What does superheat represent?
A. Temperature of liquid below saturation
B. Temperature of vapor above its saturation temperature
C. Condenser pressure
D. Compressor horsepower
Rationale: Superheat is the amount by which a vapor's actual
temperature exceeds its saturation temperature at a given
pressure.
Correct answer: B. Temperature of vapor above its saturation
temperature
10. What does subcooling describe?
A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
