Alabama Refrigeration Contractors
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a refrigeration system?
A. To generate heat inside the conditioned space
B. To transfer heat from a lower-temperature area to a higher-
temperature area
C. To increase humidity in the conditioned space
D. To convert electrical energy directly into cold air
Answer: B. To transfer heat from a lower-temperature area to a
higher-temperature area
Rationale: A refrigeration system does not create “cold.” Instead, it
removes heat from a refrigerated space and rejects that heat to a
warmer environment. The refrigeration cycle accomplishes this
through evaporation, compression, condensation, and expansion.
, 2. Which component of a vapor-compression refrigeration system
raises the pressure and temperature of the refrigerant vapor?
A. Condenser
B. Evaporator
C. Compressor
D. Expansion valve
Answer: C. Compressor
Rationale: The compressor receives low-pressure refrigerant vapor
from the evaporator and compresses it into a high-pressure, high-
temperature vapor. This allows the refrigerant to reject heat
effectively in the condenser.
3. What is the primary function of the condenser?
A. Absorb heat from the refrigerated space
B. Reduce refrigerant pressure
C. Reject heat from the refrigerant to another medium
D. Meter liquid refrigerant into the evaporator
Answer: C. Reject heat from the refrigerant to another medium
Rationale: The condenser removes heat from the high-pressure
refrigerant vapor. As heat is rejected, the refrigerant changes from
,vapor to liquid. Condensers may reject heat to air, water, or another
cooling medium.
4. What is the primary function of an evaporator?
A. Reject heat to outdoor air
B. Absorb heat from the refrigerated space or product
C. Increase refrigerant pressure
D. Store compressor oil
Answer: B. Absorb heat from the refrigerated space or product
Rationale: Refrigerant entering the evaporator is at a low pressure
and temperature. As it absorbs heat from the refrigerated
environment, it boils and changes from a liquid-rich mixture into
vapor.
5. Which device meters refrigerant into the evaporator?
A. Receiver
B. Filter-drier
C. Metering device
D. Accumulator
Answer: C. Metering device
, Rationale: The metering device controls the quantity of refrigerant
entering the evaporator and creates the pressure drop between the
high-pressure and low-pressure sides of the system.
6. What is the purpose of a thermostatic expansion valve (TXV)?
A. To control compressor motor voltage
B. To regulate refrigerant flow and maintain appropriate evaporator
superheat
C. To increase condenser pressure
D. To remove moisture from the refrigerant
Answer: B. To regulate refrigerant flow and maintain appropriate
evaporator superheat
Rationale: A TXV responds to evaporator outlet conditions and adjusts
refrigerant flow to maintain a desired superheat. Proper superheat
helps ensure that liquid refrigerant does not return to the compressor.
7. What does refrigerant superheat represent?
A. The temperature of saturated liquid below its boiling point
B. The temperature of vapor above its saturation temperature at a
given pressure
C. The difference between outdoor and indoor temperatures
D. The pressure difference across the compressor
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a refrigeration system?
A. To generate heat inside the conditioned space
B. To transfer heat from a lower-temperature area to a higher-
temperature area
C. To increase humidity in the conditioned space
D. To convert electrical energy directly into cold air
Answer: B. To transfer heat from a lower-temperature area to a
higher-temperature area
Rationale: A refrigeration system does not create “cold.” Instead, it
removes heat from a refrigerated space and rejects that heat to a
warmer environment. The refrigeration cycle accomplishes this
through evaporation, compression, condensation, and expansion.
, 2. Which component of a vapor-compression refrigeration system
raises the pressure and temperature of the refrigerant vapor?
A. Condenser
B. Evaporator
C. Compressor
D. Expansion valve
Answer: C. Compressor
Rationale: The compressor receives low-pressure refrigerant vapor
from the evaporator and compresses it into a high-pressure, high-
temperature vapor. This allows the refrigerant to reject heat
effectively in the condenser.
3. What is the primary function of the condenser?
A. Absorb heat from the refrigerated space
B. Reduce refrigerant pressure
C. Reject heat from the refrigerant to another medium
D. Meter liquid refrigerant into the evaporator
Answer: C. Reject heat from the refrigerant to another medium
Rationale: The condenser removes heat from the high-pressure
refrigerant vapor. As heat is rejected, the refrigerant changes from
,vapor to liquid. Condensers may reject heat to air, water, or another
cooling medium.
4. What is the primary function of an evaporator?
A. Reject heat to outdoor air
B. Absorb heat from the refrigerated space or product
C. Increase refrigerant pressure
D. Store compressor oil
Answer: B. Absorb heat from the refrigerated space or product
Rationale: Refrigerant entering the evaporator is at a low pressure
and temperature. As it absorbs heat from the refrigerated
environment, it boils and changes from a liquid-rich mixture into
vapor.
5. Which device meters refrigerant into the evaporator?
A. Receiver
B. Filter-drier
C. Metering device
D. Accumulator
Answer: C. Metering device
, Rationale: The metering device controls the quantity of refrigerant
entering the evaporator and creates the pressure drop between the
high-pressure and low-pressure sides of the system.
6. What is the purpose of a thermostatic expansion valve (TXV)?
A. To control compressor motor voltage
B. To regulate refrigerant flow and maintain appropriate evaporator
superheat
C. To increase condenser pressure
D. To remove moisture from the refrigerant
Answer: B. To regulate refrigerant flow and maintain appropriate
evaporator superheat
Rationale: A TXV responds to evaporator outlet conditions and adjusts
refrigerant flow to maintain a desired superheat. Proper superheat
helps ensure that liquid refrigerant does not return to the compressor.
7. What does refrigerant superheat represent?
A. The temperature of saturated liquid below its boiling point
B. The temperature of vapor above its saturation temperature at a
given pressure
C. The difference between outdoor and indoor temperatures
D. The pressure difference across the compressor
