CALIFORNIA HVAC CONTRACTOR EXAM PRACTICE TEST EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
CORE DOMAINS
* HVAC Systems Theory and Thermodynamics
* Refrigeration Cycle and Component Operation
* Electrical Systems, Controls, and Motors
* Piping, Tubing, and Ductwork Installation
* Building Codes and Safety Standards (OSHA/Title 24)
* Estimating, Bidding, and Project Management
* Business Ethics and Legal Requirements
* Equipment Maintenance and Troubleshooting
INTRODUCTION
*The purpose of this examination is to evaluate the technical competency and professional readine
SECTION ONE: QUESTIONS 1–100
Which device is primarily responsible for preventing liquid refrigerant from entering the compressor?
A. Thermal expansion valve
B. Filter drier
C. Suction line accumulator
D. Crankcase heater
🟢C
,🔴 RATIONALE: The suction line accumulator captures any liquid refrigerant that boils off too
slowly, protecting the compressor from liquid slugging, which can cause severe mechanical
damage.
According to California Title 24, what is the mandatory requirement for duct sealing in a residential
retrofit?
A. All ducts must be sealed with duct tape only
B. All accessible duct joints and seams must be sealed with mastic or approved tape
C. Duct sealing is optional if the system is less than 5 tons
D. Sealing is only required for the supply side
🟢B
🔴 RATIONALE: Title 24 energy standards mandate that all accessible duct joints and seams be
sealed using code-approved mastic or pressure-sensitive tape to reduce energy loss and improve
indoor air quality.
A technician measures high superheat and high subcooling. What is the most likely cause?
A. Overcharged system
B. Restricted liquid line filter drier
C. Low airflow over the evaporator
D. Non-condensables in the system
🟢B
🔴 RATIONALE: A restriction in the liquid line acts as a metering device, causing a pressure drop.
This leads to low evaporator pressure (high superheat) and high pressure trapped in the condenser
(high subcooling).
Which ethical action should a contractor take if they discover a competitor performed an installation
that violates a life-safety code?
A. Ignore the issue to avoid legal liability
,B. Contact the homeowner, explain the hazard, and document the findings
C. Attempt to repair it secretly without telling the client
D. Report the competitor to the Better Business Bureau only
🟢B
🔴 RATIONALE: HVAC contractors have a professional and ethical obligation to inform clients of
life-safety hazards, ensuring the client is aware of the danger and the necessary corrective actions.
What is the primary purpose of a hard-start kit on a single-phase compressor?
A. To increase the running amperage
B. To reduce the starting current
C. To provide extra starting torque
D. To regulate the compressor voltage
🟢C
🔴 RATIONALE: A hard-start kit, which includes a start capacitor and a potential relay, provides an
additional boost of torque to help a compressor motor overcome inertia during startup.
Under OSHA regulations, what is the minimum fall protection required for a worker on a roof higher
than 6 feet?
A. A warning line system
B. Personal fall arrest system or guardrails
C. A safety monitor only
D. Hard hat and safety glasses
🟢B
🔴 RATIONALE: OSHA standards require that employees working on surfaces with unprotected
sides or edges 6 feet or more above a lower level be protected by guardrail systems, safety net
systems, or personal fall arrest systems.
, What does the term "enthalpy" refer to in HVAC systems?
A. The measure of sensible heat only
B. The total heat content of air, including sensible and latent heat
C. The moisture content of the air
D. The speed at which air travels through a duct
🟢B
🔴 RATIONALE: Enthalpy represents the total energy content of the air, which is the sum of
sensible heat (temperature) and latent heat (moisture content).
If a gas furnace flame is yellow instead of blue, what is the most likely issue?
A. Excessive primary air
B. Insufficient combustion air
C. Proper gas pressure
D. Correct orifice size
🟢B
🔴 RATIONALE: A yellow flame indicates incomplete combustion, which is typically caused by a
lack of oxygen (combustion air) or an obstructed burner/heat exchanger.
Which component in a refrigeration system is responsible for the phase change from liquid to
vapor?
A. Condenser
B. Compressor
C. Evaporator
D. Receiver
🟢C
🔴 RATIONALE: In the evaporator, the low-pressure liquid refrigerant absorbs heat from the
surrounding air, causing it to boil and change phase into a low-pressure vapor.
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
CORE DOMAINS
* HVAC Systems Theory and Thermodynamics
* Refrigeration Cycle and Component Operation
* Electrical Systems, Controls, and Motors
* Piping, Tubing, and Ductwork Installation
* Building Codes and Safety Standards (OSHA/Title 24)
* Estimating, Bidding, and Project Management
* Business Ethics and Legal Requirements
* Equipment Maintenance and Troubleshooting
INTRODUCTION
*The purpose of this examination is to evaluate the technical competency and professional readine
SECTION ONE: QUESTIONS 1–100
Which device is primarily responsible for preventing liquid refrigerant from entering the compressor?
A. Thermal expansion valve
B. Filter drier
C. Suction line accumulator
D. Crankcase heater
🟢C
,🔴 RATIONALE: The suction line accumulator captures any liquid refrigerant that boils off too
slowly, protecting the compressor from liquid slugging, which can cause severe mechanical
damage.
According to California Title 24, what is the mandatory requirement for duct sealing in a residential
retrofit?
A. All ducts must be sealed with duct tape only
B. All accessible duct joints and seams must be sealed with mastic or approved tape
C. Duct sealing is optional if the system is less than 5 tons
D. Sealing is only required for the supply side
🟢B
🔴 RATIONALE: Title 24 energy standards mandate that all accessible duct joints and seams be
sealed using code-approved mastic or pressure-sensitive tape to reduce energy loss and improve
indoor air quality.
A technician measures high superheat and high subcooling. What is the most likely cause?
A. Overcharged system
B. Restricted liquid line filter drier
C. Low airflow over the evaporator
D. Non-condensables in the system
🟢B
🔴 RATIONALE: A restriction in the liquid line acts as a metering device, causing a pressure drop.
This leads to low evaporator pressure (high superheat) and high pressure trapped in the condenser
(high subcooling).
Which ethical action should a contractor take if they discover a competitor performed an installation
that violates a life-safety code?
A. Ignore the issue to avoid legal liability
,B. Contact the homeowner, explain the hazard, and document the findings
C. Attempt to repair it secretly without telling the client
D. Report the competitor to the Better Business Bureau only
🟢B
🔴 RATIONALE: HVAC contractors have a professional and ethical obligation to inform clients of
life-safety hazards, ensuring the client is aware of the danger and the necessary corrective actions.
What is the primary purpose of a hard-start kit on a single-phase compressor?
A. To increase the running amperage
B. To reduce the starting current
C. To provide extra starting torque
D. To regulate the compressor voltage
🟢C
🔴 RATIONALE: A hard-start kit, which includes a start capacitor and a potential relay, provides an
additional boost of torque to help a compressor motor overcome inertia during startup.
Under OSHA regulations, what is the minimum fall protection required for a worker on a roof higher
than 6 feet?
A. A warning line system
B. Personal fall arrest system or guardrails
C. A safety monitor only
D. Hard hat and safety glasses
🟢B
🔴 RATIONALE: OSHA standards require that employees working on surfaces with unprotected
sides or edges 6 feet or more above a lower level be protected by guardrail systems, safety net
systems, or personal fall arrest systems.
, What does the term "enthalpy" refer to in HVAC systems?
A. The measure of sensible heat only
B. The total heat content of air, including sensible and latent heat
C. The moisture content of the air
D. The speed at which air travels through a duct
🟢B
🔴 RATIONALE: Enthalpy represents the total energy content of the air, which is the sum of
sensible heat (temperature) and latent heat (moisture content).
If a gas furnace flame is yellow instead of blue, what is the most likely issue?
A. Excessive primary air
B. Insufficient combustion air
C. Proper gas pressure
D. Correct orifice size
🟢B
🔴 RATIONALE: A yellow flame indicates incomplete combustion, which is typically caused by a
lack of oxygen (combustion air) or an obstructed burner/heat exchanger.
Which component in a refrigeration system is responsible for the phase change from liquid to
vapor?
A. Condenser
B. Compressor
C. Evaporator
D. Receiver
🟢C
🔴 RATIONALE: In the evaporator, the low-pressure liquid refrigerant absorbs heat from the
surrounding air, causing it to boil and change phase into a low-pressure vapor.
