California HVAC Contractor License Examination –
Practice Exam Newest 2025 – 2026 Questions From
Actual Exams Complete 100 Questions And Correct
Detailed Answers (Verified Answers) |Already Graded
A+||Brand New!!
Content Covered (Most Frequently Tested Topics):
HVAC system components and operation, load calculation basics, duct
design and airflow, refrigeration cycle, electrical controls and safety,
combustion and gas systems, installation standards, maintenance and
troubleshooting, California codes and regulations, jobsite safety and
EPA refrigerant handling.
1. What is the primary function of a compressor in a refrigeration system?
A. Convert refrigerant vapor into liquid
B. Increase refrigerant pressure and temperature
C. Reduce airflow through the evaporator
D. Remove moisture from refrigerant
Correct Answer: B. Increase refrigerant pressure and temperature
Explanation: The compressor raises the pressure and temperature of refrigerant
vapor so it can release heat in the condenser.
2. Which HVAC component absorbs heat from indoor air?
A. Condenser coil
B. Expansion valve
C. Evaporator coil
D. Compressor
Correct Answer: C. Evaporator coil
Explanation: The evaporator coil absorbs heat from indoor air as refrigerant
evaporates and changes from liquid to vapor.
, 3. The device that meters refrigerant flow into the evaporator is called:
A. Thermostat
B. Expansion valve
C. Contactor
D. Accumulator
Correct Answer: B. Expansion valve
Explanation: The expansion valve regulates refrigerant flow and lowers its
pressure before entering the evaporator.
4. Which electrical device starts and stops the compressor based on
temperature?
A. Transformer
B. Capacitor
C. Thermostat
D. Relay
Correct Answer: C. Thermostat
Explanation: A thermostat senses temperature and signals the HVAC system to
start or stop operation.
5. What is the main purpose of a condenser coil?
A. Absorb indoor heat
B. Release heat to the outside air
C. Increase airflow
D. Store refrigerant
Correct Answer: B. Release heat to the outside air
Explanation: The condenser coil releases heat absorbed indoors and condenses
refrigerant from vapor to liquid.
6. Which refrigerant property allows it to absorb heat efficiently?
A. Low boiling point
B. High density
C. High color index
D. High electrical resistance
, Correct Answer: A. Low boiling point
Explanation: Refrigerants have low boiling points so they can easily evaporate
and absorb heat at low temperatures.
7. Airflow in duct systems is commonly measured in:
A. PSI
B. CFM
C. BTU
D. RPM
Correct Answer: B. CFM
Explanation: CFM (cubic feet per minute) measures the volume of air moving
through the system.
8. Which tool is used to measure electrical voltage in HVAC systems?
A. Thermometer
B. Manometer
C. Voltmeter
D. Hygrometer
Correct Answer: C. Voltmeter
Explanation: A voltmeter measures electrical potential difference in circuits.
9. What does BTU stand for in HVAC terminology?
A. Basic Thermal Unit
B. British Thermal Unit
C. Balanced Temperature Utility
D. Building Temperature Unit
Correct Answer: B. British Thermal Unit
Explanation: A BTU is the amount of heat required to raise one pound of water
by one degree Fahrenheit.
10.Which safety device shuts down a furnace if overheating occurs?
A. Limit switch
B. Transformer
Practice Exam Newest 2025 – 2026 Questions From
Actual Exams Complete 100 Questions And Correct
Detailed Answers (Verified Answers) |Already Graded
A+||Brand New!!
Content Covered (Most Frequently Tested Topics):
HVAC system components and operation, load calculation basics, duct
design and airflow, refrigeration cycle, electrical controls and safety,
combustion and gas systems, installation standards, maintenance and
troubleshooting, California codes and regulations, jobsite safety and
EPA refrigerant handling.
1. What is the primary function of a compressor in a refrigeration system?
A. Convert refrigerant vapor into liquid
B. Increase refrigerant pressure and temperature
C. Reduce airflow through the evaporator
D. Remove moisture from refrigerant
Correct Answer: B. Increase refrigerant pressure and temperature
Explanation: The compressor raises the pressure and temperature of refrigerant
vapor so it can release heat in the condenser.
2. Which HVAC component absorbs heat from indoor air?
A. Condenser coil
B. Expansion valve
C. Evaporator coil
D. Compressor
Correct Answer: C. Evaporator coil
Explanation: The evaporator coil absorbs heat from indoor air as refrigerant
evaporates and changes from liquid to vapor.
, 3. The device that meters refrigerant flow into the evaporator is called:
A. Thermostat
B. Expansion valve
C. Contactor
D. Accumulator
Correct Answer: B. Expansion valve
Explanation: The expansion valve regulates refrigerant flow and lowers its
pressure before entering the evaporator.
4. Which electrical device starts and stops the compressor based on
temperature?
A. Transformer
B. Capacitor
C. Thermostat
D. Relay
Correct Answer: C. Thermostat
Explanation: A thermostat senses temperature and signals the HVAC system to
start or stop operation.
5. What is the main purpose of a condenser coil?
A. Absorb indoor heat
B. Release heat to the outside air
C. Increase airflow
D. Store refrigerant
Correct Answer: B. Release heat to the outside air
Explanation: The condenser coil releases heat absorbed indoors and condenses
refrigerant from vapor to liquid.
6. Which refrigerant property allows it to absorb heat efficiently?
A. Low boiling point
B. High density
C. High color index
D. High electrical resistance
, Correct Answer: A. Low boiling point
Explanation: Refrigerants have low boiling points so they can easily evaporate
and absorb heat at low temperatures.
7. Airflow in duct systems is commonly measured in:
A. PSI
B. CFM
C. BTU
D. RPM
Correct Answer: B. CFM
Explanation: CFM (cubic feet per minute) measures the volume of air moving
through the system.
8. Which tool is used to measure electrical voltage in HVAC systems?
A. Thermometer
B. Manometer
C. Voltmeter
D. Hygrometer
Correct Answer: C. Voltmeter
Explanation: A voltmeter measures electrical potential difference in circuits.
9. What does BTU stand for in HVAC terminology?
A. Basic Thermal Unit
B. British Thermal Unit
C. Balanced Temperature Utility
D. Building Temperature Unit
Correct Answer: B. British Thermal Unit
Explanation: A BTU is the amount of heat required to raise one pound of water
by one degree Fahrenheit.
10.Which safety device shuts down a furnace if overheating occurs?
A. Limit switch
B. Transformer
