Georgia Conditioned Air Contractor Class I
Examination Questions and Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. Which component in a vapor-compression refrigeration system is
responsible for rejecting heat absorbed from the conditioned
space?
A. Evaporator
B. Expansion valve
C. Condenser
D. Receiver
Rationale: The condenser rejects heat absorbed by the refrigerant in
the evaporator, along with the heat of compression added by the
compressor. As the refrigerant releases heat to the outdoor air or
cooling medium, it condenses from a high-pressure vapor into a high-
pressure liquid before flowing to the metering device.
2. What is the primary function of the compressor in an air
conditioning system?
,A. Remove moisture from indoor air
B. Increase refrigerant pressure and circulate refrigerant
C. Reduce refrigerant temperature
D. Store liquid refrigerant
Rationale: The compressor raises the pressure and temperature of the
refrigerant vapor while maintaining refrigerant circulation throughout
the refrigeration cycle. Without adequate compression, heat transfer
cannot occur effectively.
3. Superheat is measured at which location?
A. Condenser outlet
B. Liquid line
C. Evaporator outlet or suction line
D. Receiver outlet
Rationale: Superheat is the temperature of refrigerant vapor above its
saturation temperature after leaving the evaporator. Measuring it at
the suction line ensures the evaporator is properly fed and prevents
liquid refrigerant from entering the compressor.
4. Which instrument measures electrical current?
A. Voltmeter
B. Ohmmeter
,C. Megohmmeter
D. Ammeter
Rationale: An ammeter measures electrical current in amperes. It is
commonly used to verify motor loading, troubleshoot electrical
systems, and compare operating current to manufacturer
specifications.
5. According to the refrigeration cycle, the expansion valve primarily
causes a:
A. Pressure increase
B. Temperature increase
C. Pressure reduction
D. Heat rejection
Rationale: The expansion valve meters refrigerant into the evaporator
while reducing its pressure. This pressure drop lowers the refrigerant's
saturation temperature, allowing it to absorb heat efficiently.
6. Which refrigerant line normally carries low-pressure vapor?
A. Liquid line
B. Discharge line
C. Hot gas bypass line
D. Suction line
, Rationale: The suction line transports low-pressure refrigerant vapor
from the evaporator to the compressor. Proper insulation minimizes
heat gain and improves system efficiency.
7. The purpose of a filter-drier is to:
A. Increase refrigerant pressure
B. Remove moisture and contaminants
C. Raise refrigerant temperature
D. Control airflow
Rationale: Filter-driers remove moisture, acids, and particulate
contaminants that could damage compressors, clog metering devices,
or lead to corrosion inside the refrigeration system.
8. Which psychrometric property represents the amount of moisture
in the air?
A. Dry-bulb temperature
B. Wet-bulb depression
C. Humidity ratio
D. Sensible heat
Rationale: Humidity ratio expresses the mass of water vapor
contained in a unit mass of dry air. It is an important property when
calculating latent heat loads.
Examination Questions and Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which component in a vapor-compression refrigeration system is
responsible for rejecting heat absorbed from the conditioned
space?
A. Evaporator
B. Expansion valve
C. Condenser
D. Receiver
Rationale: The condenser rejects heat absorbed by the refrigerant in
the evaporator, along with the heat of compression added by the
compressor. As the refrigerant releases heat to the outdoor air or
cooling medium, it condenses from a high-pressure vapor into a high-
pressure liquid before flowing to the metering device.
2. What is the primary function of the compressor in an air
conditioning system?
,A. Remove moisture from indoor air
B. Increase refrigerant pressure and circulate refrigerant
C. Reduce refrigerant temperature
D. Store liquid refrigerant
Rationale: The compressor raises the pressure and temperature of the
refrigerant vapor while maintaining refrigerant circulation throughout
the refrigeration cycle. Without adequate compression, heat transfer
cannot occur effectively.
3. Superheat is measured at which location?
A. Condenser outlet
B. Liquid line
C. Evaporator outlet or suction line
D. Receiver outlet
Rationale: Superheat is the temperature of refrigerant vapor above its
saturation temperature after leaving the evaporator. Measuring it at
the suction line ensures the evaporator is properly fed and prevents
liquid refrigerant from entering the compressor.
4. Which instrument measures electrical current?
A. Voltmeter
B. Ohmmeter
,C. Megohmmeter
D. Ammeter
Rationale: An ammeter measures electrical current in amperes. It is
commonly used to verify motor loading, troubleshoot electrical
systems, and compare operating current to manufacturer
specifications.
5. According to the refrigeration cycle, the expansion valve primarily
causes a:
A. Pressure increase
B. Temperature increase
C. Pressure reduction
D. Heat rejection
Rationale: The expansion valve meters refrigerant into the evaporator
while reducing its pressure. This pressure drop lowers the refrigerant's
saturation temperature, allowing it to absorb heat efficiently.
6. Which refrigerant line normally carries low-pressure vapor?
A. Liquid line
B. Discharge line
C. Hot gas bypass line
D. Suction line
, Rationale: The suction line transports low-pressure refrigerant vapor
from the evaporator to the compressor. Proper insulation minimizes
heat gain and improves system efficiency.
7. The purpose of a filter-drier is to:
A. Increase refrigerant pressure
B. Remove moisture and contaminants
C. Raise refrigerant temperature
D. Control airflow
Rationale: Filter-driers remove moisture, acids, and particulate
contaminants that could damage compressors, clog metering devices,
or lead to corrosion inside the refrigeration system.
8. Which psychrometric property represents the amount of moisture
in the air?
A. Dry-bulb temperature
B. Wet-bulb depression
C. Humidity ratio
D. Sensible heat
Rationale: Humidity ratio expresses the mass of water vapor
contained in a unit mass of dry air. It is an important property when
calculating latent heat loads.
