Alabama Refrigeration Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which refrigerant property primarily determines the pressure at which
it evaporates at a given temperature?
A. Specific gravity
B. Color
C. Saturation pressure
D. Viscosity
Rationale: Saturation pressure is directly related to the refrigerant's boiling
(evaporation) temperature. Refrigeration technicians use pressure-
temperature relationships to determine system operating conditions.
2. What is the primary function of a compressor in a refrigeration
system?
,A. Remove moisture from refrigerant
B. Increase refrigerant temperature by electric heating
C. Raise refrigerant pressure and circulate refrigerant
D. Convert liquid refrigerant into vapor
Rationale: The compressor draws low-pressure vapor from the evaporator,
compresses it into high-pressure vapor, and circulates refrigerant
throughout the system.
3. Which component rejects heat from the refrigeration system?
A. Expansion valve
B. Evaporator
C. Condenser
D. Receiver
Rationale: The condenser transfers heat absorbed in the evaporator, along
with compressor heat, to the surrounding air or water.
4. In a vapor-compression refrigeration cycle, the refrigerant enters the
evaporator as:
A. High-pressure vapor
B. Low-pressure liquid-vapor mixture
C. High-pressure liquid
D. Superheated vapor
,Rationale: After passing through the expansion device, refrigerant
becomes a low-pressure mixture that absorbs heat while evaporating.
5. Excessive superheat at the evaporator outlet generally indicates:
A. Flooding of the evaporator
B. Starved evaporator
C. Overcharged system
D. Dirty condenser
Rationale: High superheat means insufficient refrigerant is feeding the
evaporator, resulting in a starved coil.
6. What instrument is commonly used to measure refrigerant pressures?
A. Clamp meter
B. Megohmmeter
C. Manifold gauge set
D. Micrometer
Rationale: A manifold gauge set measures suction and discharge pressures
during installation, servicing, and troubleshooting.
7. Which refrigerant line carries low-pressure vapor back to the
compressor?
, A. Liquid line
B. Hot gas bypass line
C. Suction line
D. Discharge line
Rationale: The suction line transports low-pressure refrigerant vapor from
the evaporator to the compressor.
8. The primary purpose of subcooling is to ensure:
A. Compressor cooling
B. Solid liquid refrigerant reaches the expansion device
C. Increased evaporator pressure
D. Reduced condenser airflow
Rationale: Proper subcooling prevents flash gas from forming in the liquid
line before the expansion device.
9. Which refrigerant safety classification indicates lower toxicity and no
flame propagation?
A. B3
B. A1
C. A2L
D. B2
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which refrigerant property primarily determines the pressure at which
it evaporates at a given temperature?
A. Specific gravity
B. Color
C. Saturation pressure
D. Viscosity
Rationale: Saturation pressure is directly related to the refrigerant's boiling
(evaporation) temperature. Refrigeration technicians use pressure-
temperature relationships to determine system operating conditions.
2. What is the primary function of a compressor in a refrigeration
system?
,A. Remove moisture from refrigerant
B. Increase refrigerant temperature by electric heating
C. Raise refrigerant pressure and circulate refrigerant
D. Convert liquid refrigerant into vapor
Rationale: The compressor draws low-pressure vapor from the evaporator,
compresses it into high-pressure vapor, and circulates refrigerant
throughout the system.
3. Which component rejects heat from the refrigeration system?
A. Expansion valve
B. Evaporator
C. Condenser
D. Receiver
Rationale: The condenser transfers heat absorbed in the evaporator, along
with compressor heat, to the surrounding air or water.
4. In a vapor-compression refrigeration cycle, the refrigerant enters the
evaporator as:
A. High-pressure vapor
B. Low-pressure liquid-vapor mixture
C. High-pressure liquid
D. Superheated vapor
,Rationale: After passing through the expansion device, refrigerant
becomes a low-pressure mixture that absorbs heat while evaporating.
5. Excessive superheat at the evaporator outlet generally indicates:
A. Flooding of the evaporator
B. Starved evaporator
C. Overcharged system
D. Dirty condenser
Rationale: High superheat means insufficient refrigerant is feeding the
evaporator, resulting in a starved coil.
6. What instrument is commonly used to measure refrigerant pressures?
A. Clamp meter
B. Megohmmeter
C. Manifold gauge set
D. Micrometer
Rationale: A manifold gauge set measures suction and discharge pressures
during installation, servicing, and troubleshooting.
7. Which refrigerant line carries low-pressure vapor back to the
compressor?
, A. Liquid line
B. Hot gas bypass line
C. Suction line
D. Discharge line
Rationale: The suction line transports low-pressure refrigerant vapor from
the evaporator to the compressor.
8. The primary purpose of subcooling is to ensure:
A. Compressor cooling
B. Solid liquid refrigerant reaches the expansion device
C. Increased evaporator pressure
D. Reduced condenser airflow
Rationale: Proper subcooling prevents flash gas from forming in the liquid
line before the expansion device.
9. Which refrigerant safety classification indicates lower toxicity and no
flame propagation?
A. B3
B. A1
C. A2L
D. B2
