Nova Scotia Refrigeration Mechanic
Journeyperson Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary function of a compressor in a refrigeration
system?
A. To remove moisture from the refrigerant
B. To circulate air through the evaporator
C. To increase the pressure and temperature of the refrigerant
D. To absorb heat from the surroundings
The compressor raises the pressure and temperature of the refrigerant
so it can release heat in the condenser.
2. Which refrigerant is commonly used in low-temperature
commercial refrigeration systems?
A. R-410A
B. R-134a
C. R-404A
D. R-22
R-404A is widely used in low-temperature applications due to its
thermodynamic properties.
3. What does the term “superheat” refer to in a refrigeration cycle?
A. Heat added to refrigerant after condensation
B. Temperature increase of refrigerant vapor above its saturation point
,C. Heat absorbed by the condenser
D. Heat removed from the evaporator
Superheat is the additional heat added to refrigerant vapor beyond its
boiling point at a given pressure.
4. Which device controls the flow of refrigerant into the evaporator?
A. Compressor
B. Condenser
C. Receiver
D. Expansion valve
The expansion valve meters the refrigerant entering the evaporator,
controlling its pressure and flow.
5. In a refrigeration system, what is the purpose of an accumulator?
A. Increase refrigerant pressure
B. Reduce energy consumption
C. Prevent liquid refrigerant from entering the compressor
D. Cool the condenser
The accumulator ensures only vapor reaches the compressor to prevent
damage from liquid slugging.
6. Which pressure is measured on the high side of a refrigeration
system?
A. Suction pressure
B. Discharge pressure
C. Atmospheric pressure
D. Evaporator pressure
The discharge pressure is the high-side pressure in a refrigeration
system after the compressor.
, 7. What type of heat exchanger is used to subcool liquid refrigerant
before entering the expansion device?
A. Evaporator
B. Condenser
C. Liquid line heat exchanger
D. Receiver
Subcooling improves system efficiency and prevents flash gas formation.
8. Which of the following is a primary safety concern when working
with ammonia refrigeration systems?
A. High cost
B. Low efficiency
C. Toxicity and flammability
D. Corrosion
Ammonia is toxic and flammable, so proper safety procedures are
critical.
9. What is the main purpose of an oil separator in a refrigeration
system?
A. Reduce refrigerant flow
B. Heat the refrigerant
C. Remove oil from the refrigerant vapor returning to the compressor
D. Cool the condenser
Oil separators protect compressors by returning oil to the crankcase
instead of allowing it to circulate.
10. Which tool is used to measure the superheat and subcooling in a
refrigeration system?
A. Thermometer
Journeyperson Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary function of a compressor in a refrigeration
system?
A. To remove moisture from the refrigerant
B. To circulate air through the evaporator
C. To increase the pressure and temperature of the refrigerant
D. To absorb heat from the surroundings
The compressor raises the pressure and temperature of the refrigerant
so it can release heat in the condenser.
2. Which refrigerant is commonly used in low-temperature
commercial refrigeration systems?
A. R-410A
B. R-134a
C. R-404A
D. R-22
R-404A is widely used in low-temperature applications due to its
thermodynamic properties.
3. What does the term “superheat” refer to in a refrigeration cycle?
A. Heat added to refrigerant after condensation
B. Temperature increase of refrigerant vapor above its saturation point
,C. Heat absorbed by the condenser
D. Heat removed from the evaporator
Superheat is the additional heat added to refrigerant vapor beyond its
boiling point at a given pressure.
4. Which device controls the flow of refrigerant into the evaporator?
A. Compressor
B. Condenser
C. Receiver
D. Expansion valve
The expansion valve meters the refrigerant entering the evaporator,
controlling its pressure and flow.
5. In a refrigeration system, what is the purpose of an accumulator?
A. Increase refrigerant pressure
B. Reduce energy consumption
C. Prevent liquid refrigerant from entering the compressor
D. Cool the condenser
The accumulator ensures only vapor reaches the compressor to prevent
damage from liquid slugging.
6. Which pressure is measured on the high side of a refrigeration
system?
A. Suction pressure
B. Discharge pressure
C. Atmospheric pressure
D. Evaporator pressure
The discharge pressure is the high-side pressure in a refrigeration
system after the compressor.
, 7. What type of heat exchanger is used to subcool liquid refrigerant
before entering the expansion device?
A. Evaporator
B. Condenser
C. Liquid line heat exchanger
D. Receiver
Subcooling improves system efficiency and prevents flash gas formation.
8. Which of the following is a primary safety concern when working
with ammonia refrigeration systems?
A. High cost
B. Low efficiency
C. Toxicity and flammability
D. Corrosion
Ammonia is toxic and flammable, so proper safety procedures are
critical.
9. What is the main purpose of an oil separator in a refrigeration
system?
A. Reduce refrigerant flow
B. Heat the refrigerant
C. Remove oil from the refrigerant vapor returning to the compressor
D. Cool the condenser
Oil separators protect compressors by returning oil to the crankcase
instead of allowing it to circulate.
10. Which tool is used to measure the superheat and subcooling in a
refrigeration system?
A. Thermometer
