Refrigeration Contractor Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2025|2026 Q&A | Instant
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1. What is the primary function of a refrigeration system?
a) To heat air
b) To remove humidity
c) To remove heat from a space
d) To circulate refrigerant
The purpose of refrigeration is to remove heat from a space and reject
it elsewhere.
2. Which component in a refrigeration system absorbs heat?
a) Condenser
b) Evaporator
c) Compressor
d) Expansion valve
, The evaporator absorbs heat from the refrigerated space as the
refrigerant evaporates.
3. What is the function of the compressor?
a) Absorb heat
b) Raise pressure and temperature of refrigerant
c) Release heat
d) Control refrigerant flow
The compressor raises refrigerant pressure and temperature to allow
condensation in the condenser.
4. What does the condenser do?
a) Absorbs heat
b) Rejects heat to surroundings
c) Expands refrigerant
d) Controls flow
The condenser rejects heat absorbed from the evaporator plus heat of
compression to the environment.
5. The expansion device primarily controls:
a) Air temperature
b) Refrigerant flow into the evaporator
c) Pressure in the compressor
d) Condenser efficiency
Expansion devices regulate refrigerant flow to maintain evaporator
pressure and temperature.
, 6. What is the typical pressure in the high side of a refrigeration system?
a) Vacuum
b) Below atmospheric
c) Low pressure
d) Above atmospheric
The condenser side (high side) operates at pressures higher than
atmospheric.
7. Which refrigerant is commonly used in low-temperature applications?
a) R-22
b) R-134a
c) R-404A
d) R-123
R-404A is widely used in commercial freezers and low-temperature
refrigeration systems.
8. The saturation temperature is:
a) The lowest temperature of refrigerant
b) The compressor discharge temperature
c) The temperature at which liquid and vapor coexist
d) The evaporator superheat
At saturation temperature, refrigerant changes phase between liquid
and vapor.
9. What does subcooling refer to?
a) Cooling vapor below saturation
And Correct Answers (Verified Answers)
Plus Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the primary function of a refrigeration system?
a) To heat air
b) To remove humidity
c) To remove heat from a space
d) To circulate refrigerant
The purpose of refrigeration is to remove heat from a space and reject
it elsewhere.
2. Which component in a refrigeration system absorbs heat?
a) Condenser
b) Evaporator
c) Compressor
d) Expansion valve
, The evaporator absorbs heat from the refrigerated space as the
refrigerant evaporates.
3. What is the function of the compressor?
a) Absorb heat
b) Raise pressure and temperature of refrigerant
c) Release heat
d) Control refrigerant flow
The compressor raises refrigerant pressure and temperature to allow
condensation in the condenser.
4. What does the condenser do?
a) Absorbs heat
b) Rejects heat to surroundings
c) Expands refrigerant
d) Controls flow
The condenser rejects heat absorbed from the evaporator plus heat of
compression to the environment.
5. The expansion device primarily controls:
a) Air temperature
b) Refrigerant flow into the evaporator
c) Pressure in the compressor
d) Condenser efficiency
Expansion devices regulate refrigerant flow to maintain evaporator
pressure and temperature.
, 6. What is the typical pressure in the high side of a refrigeration system?
a) Vacuum
b) Below atmospheric
c) Low pressure
d) Above atmospheric
The condenser side (high side) operates at pressures higher than
atmospheric.
7. Which refrigerant is commonly used in low-temperature applications?
a) R-22
b) R-134a
c) R-404A
d) R-123
R-404A is widely used in commercial freezers and low-temperature
refrigeration systems.
8. The saturation temperature is:
a) The lowest temperature of refrigerant
b) The compressor discharge temperature
c) The temperature at which liquid and vapor coexist
d) The evaporator superheat
At saturation temperature, refrigerant changes phase between liquid
and vapor.
9. What does subcooling refer to?
a) Cooling vapor below saturation
