North Carolina Refrigeration Contractor
Licensing Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a refrigeration compressor?
A. Absorb heat from the evaporator
B. Reject heat to the condenser
C. Increase pressure and temperature of refrigerant vapor
D. Meter refrigerant into the evaporator
Answer: C
The compressor raises refrigerant vapor pressure and temperature for
heat rejection.
2. Which component meters the flow of refrigerant into the
evaporator?
A. Compressor
B. TXV
C. Receiver
D. Suction accumulator
Answer: B
The TXV controls superheat and meters refrigerant.
3. Superheat is measured at the:
A. Condenser outlet
B. Compressor discharge
,C. Evaporator outlet
D. Liquid line
Answer: C
Superheat ensures the vapor leaving the evaporator is fully vaporized.
4. Subcooling is measured at the:
A. Evaporator outlet
B. Condenser outlet
C. Compressor inlet
D. TXV inlet
Answer: B
Subcooling occurs in the condenser after refrigerant liquefies.
5. Which refrigerant is commonly used in medium-temperature
commercial refrigeration?
A. R-22
B. R-134a
C. R-404A
D. R-717
Answer: C
R-404A is widely used for medium/low-temp systems.
6. The evaporator function is to:
A. Convert liquid to vapor by absorbing heat
B. Reject heat outdoors
C. Increase refrigerant pressure
D. Regulate system charge
Answer: A
Evaporators absorb heat, causing phase change.
, 7. A receiver is typically located:
A. After the TXV
B. After the condenser
C. Before the compressor
D. Before the evaporator
Answer: B
Receivers store liquid refrigerant leaving the condenser.
8. The primary purpose of a suction accumulator is to:
A. Remove moisture
B. Prevent liquid floodback
C. Reduce discharge temperature
D. Increase subcooling
Answer: B
Accumulators protect compressors from liquid refrigerant.
9. A low superheat reading typically indicates:
A. Undercharge
B. Restricted metering device
C. Overfeeding of refrigerant
D. High ambient temperature
Answer: C
Low superheat means the evaporator may be flooded with refrigerant.
10. High head pressure may be caused by:
A. Dirty condenser coil
B. Low airflow through evaporator
C. Undercharge
D. Low ambient temperature
Licensing Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a refrigeration compressor?
A. Absorb heat from the evaporator
B. Reject heat to the condenser
C. Increase pressure and temperature of refrigerant vapor
D. Meter refrigerant into the evaporator
Answer: C
The compressor raises refrigerant vapor pressure and temperature for
heat rejection.
2. Which component meters the flow of refrigerant into the
evaporator?
A. Compressor
B. TXV
C. Receiver
D. Suction accumulator
Answer: B
The TXV controls superheat and meters refrigerant.
3. Superheat is measured at the:
A. Condenser outlet
B. Compressor discharge
,C. Evaporator outlet
D. Liquid line
Answer: C
Superheat ensures the vapor leaving the evaporator is fully vaporized.
4. Subcooling is measured at the:
A. Evaporator outlet
B. Condenser outlet
C. Compressor inlet
D. TXV inlet
Answer: B
Subcooling occurs in the condenser after refrigerant liquefies.
5. Which refrigerant is commonly used in medium-temperature
commercial refrigeration?
A. R-22
B. R-134a
C. R-404A
D. R-717
Answer: C
R-404A is widely used for medium/low-temp systems.
6. The evaporator function is to:
A. Convert liquid to vapor by absorbing heat
B. Reject heat outdoors
C. Increase refrigerant pressure
D. Regulate system charge
Answer: A
Evaporators absorb heat, causing phase change.
, 7. A receiver is typically located:
A. After the TXV
B. After the condenser
C. Before the compressor
D. Before the evaporator
Answer: B
Receivers store liquid refrigerant leaving the condenser.
8. The primary purpose of a suction accumulator is to:
A. Remove moisture
B. Prevent liquid floodback
C. Reduce discharge temperature
D. Increase subcooling
Answer: B
Accumulators protect compressors from liquid refrigerant.
9. A low superheat reading typically indicates:
A. Undercharge
B. Restricted metering device
C. Overfeeding of refrigerant
D. High ambient temperature
Answer: C
Low superheat means the evaporator may be flooded with refrigerant.
10. High head pressure may be caused by:
A. Dirty condenser coil
B. Low airflow through evaporator
C. Undercharge
D. Low ambient temperature
