California HVAC Technician Certification Exam
Questions And Correct Answer with Rational
(100% verified answer) Q & A 2026 /
Instant download PDF
1. What is the primary purpose of a refrigerant in an HVAC system?
A. To generate electricity
B. To absorb and transfer heat
C. To lubricate motors
D. To increase humidity
Correct Answer: B. Refrigerants absorb heat from one area and release it in
another through phase changes, making cooling possible.
2. Which component compresses refrigerant vapor in an air conditioning
system?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Correct Answer: C. The compressor raises the pressure and temperature of
refrigerant vapor for circulation through the system.
3. What does HVAC stand for?
A. Heating, Ventilation, and Air Conditioning
B. Heat, Vacuum, and Air Cooling
C. Heating, Vapor, and Air Circulation
D. Heat Ventilation and Cooling
,Correct Answer: A. HVAC refers to Heating, Ventilation, and Air Conditioning
systems.
4. Which refrigerant is commonly used as a replacement for R-22?
A. R-12
B. R-134a
C. R-410A
D. Ammonia
Correct Answer: C. R-410A became a common replacement because R-22 damages
the ozone layer.
5. What tool measures refrigerant pressure?
A. Multimeter
B. Vacuum pump
C. Gauge manifold set
D. Pipe cutter
Correct Answer: C. A manifold gauge set measures low-side and high-side
refrigerant pressures.
6. What happens when condenser coils are dirty?
A. Cooling efficiency increases
B. System overheats
C. Refrigerant freezes
D. Thermostat stops working
Correct Answer: B. Dirty coils reduce heat transfer, causing overheating and
reduced efficiency.
7. Which electrical device protects motors from overload?
A. Capacitor
B. Relay
C. Fuse
D. Overload protector
, Correct Answer: D. Overload protectors shut down motors when excessive heat or
current occurs.
8. What is the normal airflow direction in a refrigeration cycle?
A. Condenser to compressor to evaporator
B. Compressor to condenser to expansion device to evaporator
C. Evaporator to expansion valve to compressor
D. Compressor to evaporator to condenser
Correct Answer: B. Refrigerant flows in that sequence during the refrigeration
cycle.
9. Which component removes moisture from refrigerant?
A. Receiver
B. Accumulator
C. Filter-drier
D. Condenser
Correct Answer: C. The filter-drier removes moisture and contaminants from
refrigerant.
10.What is superheat?
A. Liquid refrigerant temperature
B. Heat added after refrigerant vaporizes
C. Pressure inside condenser
D. Temperature below freezing
Correct Answer: B. Superheat is the temperature increase above the refrigerant’s
boiling point.
11.Which meter measures electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Hygrometer
Correct Answer: C. An ohmmeter measures resistance in electrical circuits.
Questions And Correct Answer with Rational
(100% verified answer) Q & A 2026 /
Instant download PDF
1. What is the primary purpose of a refrigerant in an HVAC system?
A. To generate electricity
B. To absorb and transfer heat
C. To lubricate motors
D. To increase humidity
Correct Answer: B. Refrigerants absorb heat from one area and release it in
another through phase changes, making cooling possible.
2. Which component compresses refrigerant vapor in an air conditioning
system?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Correct Answer: C. The compressor raises the pressure and temperature of
refrigerant vapor for circulation through the system.
3. What does HVAC stand for?
A. Heating, Ventilation, and Air Conditioning
B. Heat, Vacuum, and Air Cooling
C. Heating, Vapor, and Air Circulation
D. Heat Ventilation and Cooling
,Correct Answer: A. HVAC refers to Heating, Ventilation, and Air Conditioning
systems.
4. Which refrigerant is commonly used as a replacement for R-22?
A. R-12
B. R-134a
C. R-410A
D. Ammonia
Correct Answer: C. R-410A became a common replacement because R-22 damages
the ozone layer.
5. What tool measures refrigerant pressure?
A. Multimeter
B. Vacuum pump
C. Gauge manifold set
D. Pipe cutter
Correct Answer: C. A manifold gauge set measures low-side and high-side
refrigerant pressures.
6. What happens when condenser coils are dirty?
A. Cooling efficiency increases
B. System overheats
C. Refrigerant freezes
D. Thermostat stops working
Correct Answer: B. Dirty coils reduce heat transfer, causing overheating and
reduced efficiency.
7. Which electrical device protects motors from overload?
A. Capacitor
B. Relay
C. Fuse
D. Overload protector
, Correct Answer: D. Overload protectors shut down motors when excessive heat or
current occurs.
8. What is the normal airflow direction in a refrigeration cycle?
A. Condenser to compressor to evaporator
B. Compressor to condenser to expansion device to evaporator
C. Evaporator to expansion valve to compressor
D. Compressor to evaporator to condenser
Correct Answer: B. Refrigerant flows in that sequence during the refrigeration
cycle.
9. Which component removes moisture from refrigerant?
A. Receiver
B. Accumulator
C. Filter-drier
D. Condenser
Correct Answer: C. The filter-drier removes moisture and contaminants from
refrigerant.
10.What is superheat?
A. Liquid refrigerant temperature
B. Heat added after refrigerant vaporizes
C. Pressure inside condenser
D. Temperature below freezing
Correct Answer: B. Superheat is the temperature increase above the refrigerant’s
boiling point.
11.Which meter measures electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Hygrometer
Correct Answer: C. An ohmmeter measures resistance in electrical circuits.
