Refrigeration Engineer License Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. The primary purpose of a refrigeration system is to:
a) Increase the temperature of a space
b) Remove heat from a space
c) Generate electricity
d) Compress air
Refrigeration systems are designed to extract heat from a space to
lower its temperature.
2. Which component of a refrigeration system is responsible for
compressing the refrigerant?
a) Condenser
b) Expansion valve
c) Compressor
d) Evaporator
The compressor increases the pressure and temperature of the
refrigerant vapor.
3. In a vapor-compression refrigeration system, the refrigerant
absorbs heat in the:
a) Compressor
, b) Evaporator
c) Condenser
d) Expansion device
The evaporator allows the refrigerant to absorb heat from the
environment or space being cooled.
4. The function of a condenser is to:
a) Reject heat from the refrigerant
b) Compress the refrigerant
c) Evaporate the refrigerant
d) Control refrigerant flow
Condensers remove heat from the high-pressure refrigerant vapor,
causing it to condense.
5. Which type of expansion device is commonly used in commercial
refrigeration?
a) Capillary tube
b) Thermostatic expansion valve (TXV)
c) Compressor
d) Condenser coil
TXVs regulate refrigerant flow based on the superheat at the
evaporator outlet.
6. Subcooling of a refrigerant occurs:
a) After the condenser
b) Before the evaporator
c) In the compressor
d) In the expansion valve
Subcooling lowers the refrigerant temperature below its
condensing point to improve system efficiency.
, 7. Superheat is defined as:
a) Temperature below saturation
b) Temperature above the saturation point of a vapor
c) Condensation temperature
d) Freezing point
Superheat ensures that only vapor enters the compressor,
preventing damage.
8. Which refrigerant is classified as an HFC?
a) R-22
b) R-11
c) R-134a
d) Ammonia
R-134a is a hydrofluorocarbon (HFC) commonly used in
refrigeration systems.
9. A refrigeration system is experiencing low suction pressure. The
most likely cause is:
a) Overcharged system
b) Blocked condenser
c) Low refrigerant charge
d) High ambient temperature
Low refrigerant reduces evaporator pressure and system capacity.
10. Which safety device protects a refrigeration system from
excessively high pressure?
a) Sight glass
b) Expansion valve
c) High-pressure switch
d) Solenoid valve
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. The primary purpose of a refrigeration system is to:
a) Increase the temperature of a space
b) Remove heat from a space
c) Generate electricity
d) Compress air
Refrigeration systems are designed to extract heat from a space to
lower its temperature.
2. Which component of a refrigeration system is responsible for
compressing the refrigerant?
a) Condenser
b) Expansion valve
c) Compressor
d) Evaporator
The compressor increases the pressure and temperature of the
refrigerant vapor.
3. In a vapor-compression refrigeration system, the refrigerant
absorbs heat in the:
a) Compressor
, b) Evaporator
c) Condenser
d) Expansion device
The evaporator allows the refrigerant to absorb heat from the
environment or space being cooled.
4. The function of a condenser is to:
a) Reject heat from the refrigerant
b) Compress the refrigerant
c) Evaporate the refrigerant
d) Control refrigerant flow
Condensers remove heat from the high-pressure refrigerant vapor,
causing it to condense.
5. Which type of expansion device is commonly used in commercial
refrigeration?
a) Capillary tube
b) Thermostatic expansion valve (TXV)
c) Compressor
d) Condenser coil
TXVs regulate refrigerant flow based on the superheat at the
evaporator outlet.
6. Subcooling of a refrigerant occurs:
a) After the condenser
b) Before the evaporator
c) In the compressor
d) In the expansion valve
Subcooling lowers the refrigerant temperature below its
condensing point to improve system efficiency.
, 7. Superheat is defined as:
a) Temperature below saturation
b) Temperature above the saturation point of a vapor
c) Condensation temperature
d) Freezing point
Superheat ensures that only vapor enters the compressor,
preventing damage.
8. Which refrigerant is classified as an HFC?
a) R-22
b) R-11
c) R-134a
d) Ammonia
R-134a is a hydrofluorocarbon (HFC) commonly used in
refrigeration systems.
9. A refrigeration system is experiencing low suction pressure. The
most likely cause is:
a) Overcharged system
b) Blocked condenser
c) Low refrigerant charge
d) High ambient temperature
Low refrigerant reduces evaporator pressure and system capacity.
10. Which safety device protects a refrigeration system from
excessively high pressure?
a) Sight glass
b) Expansion valve
c) High-pressure switch
d) Solenoid valve
