Manitoba Refrigeration Mechanic Certification
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. Absorb heat from the evaporator
B. Reject heat to the atmosphere
C. Increase refrigerant pressure and circulate refrigerant
D. Meter refrigerant into the evaporator
Answer: C
Rationale: The compressor raises the pressure and temperature of
the refrigerant and moves it through the system.
2. Which component removes moisture and contaminants from the
refrigerant?
A. Accumulator
B. Receiver
C. Filter-drier
D. Oil separator
Answer: C
Rationale: Filter-driers are designed to remove moisture, acids,
and debris.
3. What condition is indicated by frost forming on a compressor
suction line?
, A. High superheat
B. Floodback or low superheat
C. High head pressure
D. Restricted condenser airflow
Answer: B
Rationale: Frost on the suction line suggests refrigerant returning
as liquid.
4. Which refrigerant is classified as an HFC?
A. R-22
B. R-134a
C. R-717
D. R-744
Answer: B
Rationale: R-134a is a hydrofluorocarbon refrigerant.
5. The evaporator’s main purpose is to:
A. Condense refrigerant vapor
B. Store excess refrigerant
C. Absorb heat from the cooled space
D. Reduce compressor discharge pressure
Answer: C
Rationale: Heat absorption occurs in the evaporator.
6. What safety control prevents excessive discharge pressure?
A. Low-pressure control
B. Oil safety switch
C. High-pressure control
D. Thermostat
Answer: C
, Rationale: High-pressure controls shut down the system to prevent
damage.
7. Which tool is used to measure superheat?
A. Manifold gauge only
B. Thermometer only
C. Manifold gauge and thermometer
D. Vacuum pump
Answer: C
Rationale: Superheat requires pressure and temperature
measurements.
8. What happens to refrigerant pressure as temperature increases in
a sealed system?
A. Pressure decreases
B. Pressure remains constant
C. Pressure increases
D. Pressure becomes negative
Answer: C
Rationale: Pressure and temperature are directly related.
9. Which valve type maintains constant superheat?
A. Capillary tube
B. Hand expansion valve
C. Thermostatic expansion valve
D. Solenoid valve
Answer: C
Rationale: TXVs regulate refrigerant flow based on superheat.
10. What is the normal function of a receiver?
A. Separate oil from refrigerant
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. Absorb heat from the evaporator
B. Reject heat to the atmosphere
C. Increase refrigerant pressure and circulate refrigerant
D. Meter refrigerant into the evaporator
Answer: C
Rationale: The compressor raises the pressure and temperature of
the refrigerant and moves it through the system.
2. Which component removes moisture and contaminants from the
refrigerant?
A. Accumulator
B. Receiver
C. Filter-drier
D. Oil separator
Answer: C
Rationale: Filter-driers are designed to remove moisture, acids,
and debris.
3. What condition is indicated by frost forming on a compressor
suction line?
, A. High superheat
B. Floodback or low superheat
C. High head pressure
D. Restricted condenser airflow
Answer: B
Rationale: Frost on the suction line suggests refrigerant returning
as liquid.
4. Which refrigerant is classified as an HFC?
A. R-22
B. R-134a
C. R-717
D. R-744
Answer: B
Rationale: R-134a is a hydrofluorocarbon refrigerant.
5. The evaporator’s main purpose is to:
A. Condense refrigerant vapor
B. Store excess refrigerant
C. Absorb heat from the cooled space
D. Reduce compressor discharge pressure
Answer: C
Rationale: Heat absorption occurs in the evaporator.
6. What safety control prevents excessive discharge pressure?
A. Low-pressure control
B. Oil safety switch
C. High-pressure control
D. Thermostat
Answer: C
, Rationale: High-pressure controls shut down the system to prevent
damage.
7. Which tool is used to measure superheat?
A. Manifold gauge only
B. Thermometer only
C. Manifold gauge and thermometer
D. Vacuum pump
Answer: C
Rationale: Superheat requires pressure and temperature
measurements.
8. What happens to refrigerant pressure as temperature increases in
a sealed system?
A. Pressure decreases
B. Pressure remains constant
C. Pressure increases
D. Pressure becomes negative
Answer: C
Rationale: Pressure and temperature are directly related.
9. Which valve type maintains constant superheat?
A. Capillary tube
B. Hand expansion valve
C. Thermostatic expansion valve
D. Solenoid valve
Answer: C
Rationale: TXVs regulate refrigerant flow based on superheat.
10. What is the normal function of a receiver?
A. Separate oil from refrigerant
