ICE HVACR Technician Certification Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. Which type of refrigerant is most commonly used in modern residential air
conditioning systems?
A) R-22
B) R-410A
C) R-12
D) R-134a
Rationale: R-410A has replaced R-22 in most modern systems due to
environmental regulations and improved efficiency.
2. What is the purpose of a TXV (Thermostatic Expansion Valve)?
A) Increase refrigerant pressure
B) Regulate refrigerant flow into the evaporator
C) Compress refrigerant
D) Convert refrigerant from gas to liquid
Rationale: A TXV controls the amount of refrigerant entering the
evaporator to ensure efficient cooling and prevent flooding.
3. Which component in an HVACR system removes heat from indoor air?
A) Condenser
B) Compressor
C) Evaporator coil
, D) Expansion valve
Rationale: The evaporator coil absorbs heat from indoor air, cooling the
space.
4. What is the main function of a compressor in a refrigeration system?
A) Absorb heat from the environment
B) Increase the pressure of the refrigerant
C) Reduce airflow
D) Expand refrigerant
Rationale: The compressor raises the refrigerant pressure and
temperature, enabling heat rejection in the condenser.
5. A high superheat reading at the evaporator outlet typically indicates:
A) Low refrigerant charge
B) Insufficient refrigerant in the evaporator
C) Overcharged system
D) Dirty condenser
Rationale: High superheat usually means the evaporator is not getting
enough refrigerant to absorb the heat load.
6. Which tool is used to measure airflow in a duct system?
A) Multimeter
B) Anemometer
C) Manometer
D) Thermometer
Rationale: An anemometer measures the velocity of air, which can be used
to calculate airflow in CFM.
7. What is the primary reason for installing a liquid line filter-drier?
A) Increase refrigerant flow
B) Remove moisture and debris from the refrigerant
C) Lower system pressure
D) Measure refrigerant charge
Rationale: Filter-driers prevent contaminants and moisture from
damaging the system components.
, 8. Which safety device shuts down the compressor if the pressure is too high?
A) Low-pressure switch
B) High-pressure switch
C) Thermostat
D) Expansion valve
Rationale: High-pressure switches prevent system overpressure that could
damage components.
9. Which type of oil is typically used in a scroll compressor?
A) Mineral oil
B) Polyolester (POE) oil
C) Polypropylene glycol
D) Silicone oil
Rationale: POE oil is compatible with HFC refrigerants like R-410A,
commonly used in scroll compressors.
10.What does the term “subcooling” refer to?
A) Heat absorbed by the evaporator
B) Cooling of the refrigerant below its condensation temperature
C) Cooling of air by the condenser
D) Low suction pressure in the compressor
Rationale: Subcooling ensures the refrigerant is fully condensed before
entering the expansion device.
11.Which refrigerant is considered an ozone-depleting substance?
A) R-134a
B) R-22
C) R-410A
D) R-407C
Rationale: R-22 is an HCFC and contributes to ozone depletion.
12.What tool is used to check for refrigerant leaks using ultraviolet dye?
A) Multimeter
B) UV leak detector
C) Pressure gauge
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. Which type of refrigerant is most commonly used in modern residential air
conditioning systems?
A) R-22
B) R-410A
C) R-12
D) R-134a
Rationale: R-410A has replaced R-22 in most modern systems due to
environmental regulations and improved efficiency.
2. What is the purpose of a TXV (Thermostatic Expansion Valve)?
A) Increase refrigerant pressure
B) Regulate refrigerant flow into the evaporator
C) Compress refrigerant
D) Convert refrigerant from gas to liquid
Rationale: A TXV controls the amount of refrigerant entering the
evaporator to ensure efficient cooling and prevent flooding.
3. Which component in an HVACR system removes heat from indoor air?
A) Condenser
B) Compressor
C) Evaporator coil
, D) Expansion valve
Rationale: The evaporator coil absorbs heat from indoor air, cooling the
space.
4. What is the main function of a compressor in a refrigeration system?
A) Absorb heat from the environment
B) Increase the pressure of the refrigerant
C) Reduce airflow
D) Expand refrigerant
Rationale: The compressor raises the refrigerant pressure and
temperature, enabling heat rejection in the condenser.
5. A high superheat reading at the evaporator outlet typically indicates:
A) Low refrigerant charge
B) Insufficient refrigerant in the evaporator
C) Overcharged system
D) Dirty condenser
Rationale: High superheat usually means the evaporator is not getting
enough refrigerant to absorb the heat load.
6. Which tool is used to measure airflow in a duct system?
A) Multimeter
B) Anemometer
C) Manometer
D) Thermometer
Rationale: An anemometer measures the velocity of air, which can be used
to calculate airflow in CFM.
7. What is the primary reason for installing a liquid line filter-drier?
A) Increase refrigerant flow
B) Remove moisture and debris from the refrigerant
C) Lower system pressure
D) Measure refrigerant charge
Rationale: Filter-driers prevent contaminants and moisture from
damaging the system components.
, 8. Which safety device shuts down the compressor if the pressure is too high?
A) Low-pressure switch
B) High-pressure switch
C) Thermostat
D) Expansion valve
Rationale: High-pressure switches prevent system overpressure that could
damage components.
9. Which type of oil is typically used in a scroll compressor?
A) Mineral oil
B) Polyolester (POE) oil
C) Polypropylene glycol
D) Silicone oil
Rationale: POE oil is compatible with HFC refrigerants like R-410A,
commonly used in scroll compressors.
10.What does the term “subcooling” refer to?
A) Heat absorbed by the evaporator
B) Cooling of the refrigerant below its condensation temperature
C) Cooling of air by the condenser
D) Low suction pressure in the compressor
Rationale: Subcooling ensures the refrigerant is fully condensed before
entering the expansion device.
11.Which refrigerant is considered an ozone-depleting substance?
A) R-134a
B) R-22
C) R-410A
D) R-407C
Rationale: R-22 is an HCFC and contributes to ozone depletion.
12.What tool is used to check for refrigerant leaks using ultraviolet dye?
A) Multimeter
B) UV leak detector
C) Pressure gauge
