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Georgia Refrigeration Contractor
Examination Advanced Practice Exam
2026 | 100 Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. A refrigeration system has a high condensing pressure while suction
pressure remains near normal. Which condition is most likely?
A. Low evaporator load
B. Overcharge or restricted condenser airflow
C. Underfeeding TXV
D. Low refrigerant charge
Answer: Overcharge or restricted condenser airflow
Rationale: Elevated condensing pressure with relatively normal suction pressure
commonly indicates excessive refrigerant charge, inadequate condenser airflow,
or poor heat rejection.
2. What is the primary purpose of a liquid receiver in a refrigeration system?
A. Increase compressor displacement
B. Store liquid refrigerant during varying operating conditions
,C. Remove moisture from refrigerant
D. Increase suction pressure
Answer: Store liquid refrigerant during varying operating conditions
Rationale: A receiver provides liquid storage so the system can accommodate
changing refrigerant volume and maintain a solid liquid supply to the metering
device.
3. A TXV system has excessive superheat and a starved evaporator. Which
condition should be investigated first?
A. Excessive condenser subcooling
B. Restricted liquid line or insufficient refrigerant feed
C. Oversized compressor
D. High evaporator pressure
Answer: Restricted liquid line or insufficient refrigerant feed
Rationale: Excessive superheat combined with a starved evaporator indicates
inadequate refrigerant entering the evaporator.
4. What does evaporator superheat primarily indicate?
A. Condenser capacity
B. Amount of liquid refrigerant remaining at the evaporator outlet
C. Degree to which refrigerant vapor has been heated above saturation
temperature
D. Compressor oil temperature
Answer: Degree to which refrigerant vapor has been heated above saturation
temperature
Rationale: Superheat is the difference between actual vapor temperature and
saturation temperature at the measured pressure.
5. A compressor operates with abnormally high discharge temperature. Which
combination is most likely to cause this condition?
,A. Low compression ratio and flooded evaporator
B. High compression ratio and low suction gas density
C. High suction pressure and low condensing pressure
D. Excessive evaporator airflow
Answer: High compression ratio and low suction gas density
Rationale: High compression ratios and insufficient suction-gas cooling can
significantly increase compressor discharge temperature.
6. What is the principal function of a liquid-line filter-drier?
A. Increase compressor efficiency
B. Remove moisture, acids, and contaminants from the refrigerant circuit
C. Increase refrigerant pressure
D. Meter liquid refrigerant
Answer: Remove moisture, acids, and contaminants from the refrigerant circuit
Rationale: Filter-driers protect the system by capturing contaminants and
absorbing moisture that can damage components or cause freezing and
corrosion.
7. Why should a refrigeration system be evacuated with a properly sized
vacuum pump rather than relying on refrigerant pressure?
A. Refrigerant pressure removes moisture faster
B. Vacuum removes air and lowers the boiling point of trapped moisture
C. Refrigerant pressure eliminates noncondensables
D. Pressure testing removes acid
Answer: Vacuum removes air and lowers the boiling point of trapped moisture
Rationale: Deep evacuation reduces system pressure enough for moisture to boil
and be removed by the vacuum pump.
8. A system repeatedly develops ice at the evaporator inlet while the
remainder of the coil remains relatively dry. What is a likely cause?
, A. Excessive condenser airflow
B. Restricted refrigerant flow through the metering device
C. Excessive compressor capacity
D. High subcooling caused by a receiver
Answer: Restricted refrigerant flow through the metering device
Rationale: A restriction can cause refrigerant to flash prematurely and produce
an improperly fed evaporator with localized icing.
9. What is the primary purpose of subcooling liquid refrigerant leaving the
condenser?
A. Prevent liquid from reaching the condenser
B. Ensure a solid column of liquid reaches the metering device
C. Increase suction pressure
D. Prevent compressor oil return
Answer: Ensure a solid column of liquid reaches the metering device
Rationale: Adequate liquid subcooling helps prevent premature flashing in the
liquid line and provides reliable metering-device operation.
10.A refrigeration compressor is short-cycling on its low-pressure control.
Which condition could cause this problem?
A. Excessively high evaporator load
B. Low refrigerant charge or evaporator starvation
C. Excessive condenser capacity
D. Oversized receiver only
Answer: Low refrigerant charge or evaporator starvation
Rationale: Insufficient refrigerant can cause suction pressure to fall rapidly,
causing the low-pressure control to cycle the compressor off.
11.What is the purpose of a crankcase heater?
Georgia Refrigeration Contractor
Examination Advanced Practice Exam
2026 | 100 Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. A refrigeration system has a high condensing pressure while suction
pressure remains near normal. Which condition is most likely?
A. Low evaporator load
B. Overcharge or restricted condenser airflow
C. Underfeeding TXV
D. Low refrigerant charge
Answer: Overcharge or restricted condenser airflow
Rationale: Elevated condensing pressure with relatively normal suction pressure
commonly indicates excessive refrigerant charge, inadequate condenser airflow,
or poor heat rejection.
2. What is the primary purpose of a liquid receiver in a refrigeration system?
A. Increase compressor displacement
B. Store liquid refrigerant during varying operating conditions
,C. Remove moisture from refrigerant
D. Increase suction pressure
Answer: Store liquid refrigerant during varying operating conditions
Rationale: A receiver provides liquid storage so the system can accommodate
changing refrigerant volume and maintain a solid liquid supply to the metering
device.
3. A TXV system has excessive superheat and a starved evaporator. Which
condition should be investigated first?
A. Excessive condenser subcooling
B. Restricted liquid line or insufficient refrigerant feed
C. Oversized compressor
D. High evaporator pressure
Answer: Restricted liquid line or insufficient refrigerant feed
Rationale: Excessive superheat combined with a starved evaporator indicates
inadequate refrigerant entering the evaporator.
4. What does evaporator superheat primarily indicate?
A. Condenser capacity
B. Amount of liquid refrigerant remaining at the evaporator outlet
C. Degree to which refrigerant vapor has been heated above saturation
temperature
D. Compressor oil temperature
Answer: Degree to which refrigerant vapor has been heated above saturation
temperature
Rationale: Superheat is the difference between actual vapor temperature and
saturation temperature at the measured pressure.
5. A compressor operates with abnormally high discharge temperature. Which
combination is most likely to cause this condition?
,A. Low compression ratio and flooded evaporator
B. High compression ratio and low suction gas density
C. High suction pressure and low condensing pressure
D. Excessive evaporator airflow
Answer: High compression ratio and low suction gas density
Rationale: High compression ratios and insufficient suction-gas cooling can
significantly increase compressor discharge temperature.
6. What is the principal function of a liquid-line filter-drier?
A. Increase compressor efficiency
B. Remove moisture, acids, and contaminants from the refrigerant circuit
C. Increase refrigerant pressure
D. Meter liquid refrigerant
Answer: Remove moisture, acids, and contaminants from the refrigerant circuit
Rationale: Filter-driers protect the system by capturing contaminants and
absorbing moisture that can damage components or cause freezing and
corrosion.
7. Why should a refrigeration system be evacuated with a properly sized
vacuum pump rather than relying on refrigerant pressure?
A. Refrigerant pressure removes moisture faster
B. Vacuum removes air and lowers the boiling point of trapped moisture
C. Refrigerant pressure eliminates noncondensables
D. Pressure testing removes acid
Answer: Vacuum removes air and lowers the boiling point of trapped moisture
Rationale: Deep evacuation reduces system pressure enough for moisture to boil
and be removed by the vacuum pump.
8. A system repeatedly develops ice at the evaporator inlet while the
remainder of the coil remains relatively dry. What is a likely cause?
, A. Excessive condenser airflow
B. Restricted refrigerant flow through the metering device
C. Excessive compressor capacity
D. High subcooling caused by a receiver
Answer: Restricted refrigerant flow through the metering device
Rationale: A restriction can cause refrigerant to flash prematurely and produce
an improperly fed evaporator with localized icing.
9. What is the primary purpose of subcooling liquid refrigerant leaving the
condenser?
A. Prevent liquid from reaching the condenser
B. Ensure a solid column of liquid reaches the metering device
C. Increase suction pressure
D. Prevent compressor oil return
Answer: Ensure a solid column of liquid reaches the metering device
Rationale: Adequate liquid subcooling helps prevent premature flashing in the
liquid line and provides reliable metering-device operation.
10.A refrigeration compressor is short-cycling on its low-pressure control.
Which condition could cause this problem?
A. Excessively high evaporator load
B. Low refrigerant charge or evaporator starvation
C. Excessive condenser capacity
D. Oversized receiver only
Answer: Low refrigerant charge or evaporator starvation
Rationale: Insufficient refrigerant can cause suction pressure to fall rapidly,
causing the low-pressure control to cycle the compressor off.
11.What is the purpose of a crankcase heater?
