Massachusetts Refrigeration Technician
Licensing 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 create cold air from nothing
B. To transfer heat from a lower-temperature space to a higher-
temperature location
C. To increase humidity inside the conditioned space
D. To convert electrical energy directly into cooling
Answer: B. To transfer heat from a lower-temperature space to a
higher-temperature location
Rationale: A refrigeration system does not create “cold.” It removes
heat from the refrigerated space and rejects that heat to another
location, usually the surrounding air or a water source. The
,refrigeration cycle accomplishes this through evaporation,
compression, condensation, and expansion.
2. Which component normally raises the pressure and temperature
of refrigerant vapor?
A. Evaporator
B. Condenser
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 pressure increase allows the refrigerant to
reject heat in the condenser.
3. What is the primary function of an evaporator?
A. Reject heat to outdoor air
B. Absorb heat from the refrigerated space or medium
C. Increase refrigerant pressure
D. Store liquid refrigerant permanently
Answer: B. Absorb heat from the refrigerated space or medium
,Rationale: Refrigerant enters the evaporator at a relatively low
pressure and temperature. As it evaporates, it absorbs heat from the
surrounding air, product, water, or other medium being cooled.
4. What is the principal function of the condenser?
A. Absorb heat from the refrigerated space
B. Reduce compressor discharge pressure
C. Reject heat from the refrigerant
D. Meter refrigerant into the evaporator
Answer: C. Reject heat from the refrigerant
Rationale: The condenser removes heat from the hot refrigerant vapor
leaving the compressor. As heat is rejected, the refrigerant condenses
from vapor to liquid.
5. Which device meters refrigerant entering the evaporator?
A. Compressor
B. Condenser fan
C. Expansion device
D. Receiver
Answer: C. Expansion device
Rationale: An expansion valve, capillary tube, or similar metering
device creates a pressure drop and regulates refrigerant flow into the
, evaporator. This allows the refrigerant to reach the pressure and
temperature needed for evaporation.
6. What happens to refrigerant pressure as it passes through a
typical expansion device?
A. It increases substantially
B. It decreases
C. It remains exactly constant
D. It becomes equal to atmospheric pressure in every system
Answer: B. It decreases
Rationale: The expansion device separates the high-pressure side from
the low-pressure side. The refrigerant experiences a significant
pressure reduction, causing a corresponding reduction in saturation
temperature.
7. Which condition describes refrigerant vapor that is above its
saturation temperature at a given pressure?
A. Subcooled liquid
B. Saturated liquid
C. Superheated vapor
D. Flash gas
Answer: C. Superheated vapor
Licensing 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 create cold air from nothing
B. To transfer heat from a lower-temperature space to a higher-
temperature location
C. To increase humidity inside the conditioned space
D. To convert electrical energy directly into cooling
Answer: B. To transfer heat from a lower-temperature space to a
higher-temperature location
Rationale: A refrigeration system does not create “cold.” It removes
heat from the refrigerated space and rejects that heat to another
location, usually the surrounding air or a water source. The
,refrigeration cycle accomplishes this through evaporation,
compression, condensation, and expansion.
2. Which component normally raises the pressure and temperature
of refrigerant vapor?
A. Evaporator
B. Condenser
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 pressure increase allows the refrigerant to
reject heat in the condenser.
3. What is the primary function of an evaporator?
A. Reject heat to outdoor air
B. Absorb heat from the refrigerated space or medium
C. Increase refrigerant pressure
D. Store liquid refrigerant permanently
Answer: B. Absorb heat from the refrigerated space or medium
,Rationale: Refrigerant enters the evaporator at a relatively low
pressure and temperature. As it evaporates, it absorbs heat from the
surrounding air, product, water, or other medium being cooled.
4. What is the principal function of the condenser?
A. Absorb heat from the refrigerated space
B. Reduce compressor discharge pressure
C. Reject heat from the refrigerant
D. Meter refrigerant into the evaporator
Answer: C. Reject heat from the refrigerant
Rationale: The condenser removes heat from the hot refrigerant vapor
leaving the compressor. As heat is rejected, the refrigerant condenses
from vapor to liquid.
5. Which device meters refrigerant entering the evaporator?
A. Compressor
B. Condenser fan
C. Expansion device
D. Receiver
Answer: C. Expansion device
Rationale: An expansion valve, capillary tube, or similar metering
device creates a pressure drop and regulates refrigerant flow into the
, evaporator. This allows the refrigerant to reach the pressure and
temperature needed for evaporation.
6. What happens to refrigerant pressure as it passes through a
typical expansion device?
A. It increases substantially
B. It decreases
C. It remains exactly constant
D. It becomes equal to atmospheric pressure in every system
Answer: B. It decreases
Rationale: The expansion device separates the high-pressure side from
the low-pressure side. The refrigerant experiences a significant
pressure reduction, causing a corresponding reduction in saturation
temperature.
7. Which condition describes refrigerant vapor that is above its
saturation temperature at a given pressure?
A. Subcooled liquid
B. Saturated liquid
C. Superheated vapor
D. Flash gas
Answer: C. Superheated vapor
