UA STAR HVACR MASTERY
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. The primary purpose of refrigerant in an HVACR system is to:
A. Transfer heat
B. Provide structural support
C. Control air flow
D. Reduce electrical consumption
Refrigerant absorbs and releases heat during phase changes, enabling
heat transfer.
2. The most common refrigerant used in residential systems today is:
A. R-22
B. R-410A
C. R-134a
D. Ammonia
R-410A replaced R-22 due to environmental regulations.
3. HVACR stands for:
A. Heating, Ventilation, and Air Cooling
B. Heating, Ventilation, Air Conditioning, and Refrigeration
C. Heat, Vent, AC, Radiant
D. Heat, Vapor, Air, Refrigerant
Defines the complete industry scope.
4. The component that removes heat from indoor air is the:
A. Compressor
B. Evaporator coil
, C. Condenser coil
D. Expansion valve
Evaporator coil absorbs heat into the refrigerant.
5. In a refrigeration cycle, the compressor’s job is to:
A. Cool the refrigerant
B. Filter air
C. Raise refrigerant pressure
D. Expand refrigerant volume
Higher pressure allows heat rejection in condenser.
6. The condenser coil’s function is to:
A. Evaporate refrigerant
B. Release heat to the outdoors
C. Filter indoor air
D. Reduce pressure
Heat is expelled to surrounding air in the condenser.
7. A thermostatic expansion valve (TXV) primarily:
A. Filters refrigerant
B. Regulates refrigerant flow
C. Compresses refrigerant
D. Cleans coils
TXV controls refrigerant entering evaporator.
8. Superheat refers to:
A. Temperature below freezing
B. Heat added to vapor above its boiling point
C. Heat removed from liquid
D. Pressure at condenser
Superheat ensures no liquid refrigerant returns to compressor.
9. Subcooling is:
A. Cooling refrigerant above boiling point
B. Cooling liquid refrigerant below condensing temperature
C. Heating liquid refrigerant
D. Pressure drop across expansion device
Indicates refrigerant fully condensed and extra cooling.
, 10.A common method of leak detection for refrigerant is:
A. Infrared
B. Electronic leak detector
C. Thermometer
D. Pressure gauge only
Electronic detectors are sensitive to trace refrigerant.
11.HVACR system efficiency is measured in:
A. RPM
B. SEER/EER
C. PSI
D. Volts
SEER (Seasonal Energy Efficiency Ratio) and EER are standard metrics.
12.The blower motor in an air handler moves:
A. Refrigerant
B. Air through ducts
C. Fuel through burner
D. Coolant through radiator
Blower distributes conditioned air.
13.Duct static pressure affects:
A. Fuel consumption
B. Airflow performance
C. Refrigerant charge
D. Compressor speed
Static pressure impacts how easily air moves.
14.A split system has components:
A. All indoors
B. All outdoors
C. Both indoors and outdoors
D. Portable
Split systems have indoor coil and outdoor compressor/condenser.
15.The refrigerant line carrying low-pressure vapor is the:
A. Liquid line
B. Equalizer line
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. The primary purpose of refrigerant in an HVACR system is to:
A. Transfer heat
B. Provide structural support
C. Control air flow
D. Reduce electrical consumption
Refrigerant absorbs and releases heat during phase changes, enabling
heat transfer.
2. The most common refrigerant used in residential systems today is:
A. R-22
B. R-410A
C. R-134a
D. Ammonia
R-410A replaced R-22 due to environmental regulations.
3. HVACR stands for:
A. Heating, Ventilation, and Air Cooling
B. Heating, Ventilation, Air Conditioning, and Refrigeration
C. Heat, Vent, AC, Radiant
D. Heat, Vapor, Air, Refrigerant
Defines the complete industry scope.
4. The component that removes heat from indoor air is the:
A. Compressor
B. Evaporator coil
, C. Condenser coil
D. Expansion valve
Evaporator coil absorbs heat into the refrigerant.
5. In a refrigeration cycle, the compressor’s job is to:
A. Cool the refrigerant
B. Filter air
C. Raise refrigerant pressure
D. Expand refrigerant volume
Higher pressure allows heat rejection in condenser.
6. The condenser coil’s function is to:
A. Evaporate refrigerant
B. Release heat to the outdoors
C. Filter indoor air
D. Reduce pressure
Heat is expelled to surrounding air in the condenser.
7. A thermostatic expansion valve (TXV) primarily:
A. Filters refrigerant
B. Regulates refrigerant flow
C. Compresses refrigerant
D. Cleans coils
TXV controls refrigerant entering evaporator.
8. Superheat refers to:
A. Temperature below freezing
B. Heat added to vapor above its boiling point
C. Heat removed from liquid
D. Pressure at condenser
Superheat ensures no liquid refrigerant returns to compressor.
9. Subcooling is:
A. Cooling refrigerant above boiling point
B. Cooling liquid refrigerant below condensing temperature
C. Heating liquid refrigerant
D. Pressure drop across expansion device
Indicates refrigerant fully condensed and extra cooling.
, 10.A common method of leak detection for refrigerant is:
A. Infrared
B. Electronic leak detector
C. Thermometer
D. Pressure gauge only
Electronic detectors are sensitive to trace refrigerant.
11.HVACR system efficiency is measured in:
A. RPM
B. SEER/EER
C. PSI
D. Volts
SEER (Seasonal Energy Efficiency Ratio) and EER are standard metrics.
12.The blower motor in an air handler moves:
A. Refrigerant
B. Air through ducts
C. Fuel through burner
D. Coolant through radiator
Blower distributes conditioned air.
13.Duct static pressure affects:
A. Fuel consumption
B. Airflow performance
C. Refrigerant charge
D. Compressor speed
Static pressure impacts how easily air moves.
14.A split system has components:
A. All indoors
B. All outdoors
C. Both indoors and outdoors
D. Portable
Split systems have indoor coil and outdoor compressor/condenser.
15.The refrigerant line carrying low-pressure vapor is the:
A. Liquid line
B. Equalizer line
