California HVAC Contractor Exam With
Actual Questions & Verified
Answers,Plus Rationales/Expert
Verified For Guaranteed Pass Graded
A+/2026 /Latest Update/Instant
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1. Which refrigerant is most commonly used in residential air conditioning
systems today?
A. R-12
B. R-410A
C. R-22
D. R-134a
Rationale: R-410A replaced R-22 due to EPA phase-out regulations and is
widely used in modern residential systems.
2. What is the primary purpose of an expansion valve in a refrigeration
cycle?
A. To compress refrigerant vapor
B. To reduce refrigerant pressure and temperature
C. To circulate air in the system
D. To remove moisture
Rationale: The expansion valve lowers the pressure and temperature of
the refrigerant before entering the evaporator.
3. The superheat reading is measured at which point in an HVAC system?
A. Compressor inlet
B. Evaporator outlet
C. Condenser inlet
, D. Metering device
Rationale: Superheat is the temperature of the vapor refrigerant above
its boiling point measured at the evaporator outlet.
4. What does SEER stand for in HVAC terminology?
A. Seasonal Electrical Energy Ratio
B. Seasonal Energy Efficiency Ratio
C. Standard Energy Efficiency Rating
D. Seasonal Efficiency Energy Rating
Rationale: SEER represents the cooling output during a season divided by
the total electrical energy input.
5. Which type of duct material provides the least air resistance?
A. Flexible duct
B. Sheet metal duct
C. Fiberboard duct
D. Plastic duct
Rationale: Sheet metal ducts have smooth interiors that reduce air
friction losses.
6. What is the minimum working clearance required in front of an electrical
panel per NEC?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
Rationale: NEC requires a 36-inch clearance in front of panels for safety
and maintenance access.
7. The purpose of a TXV (Thermostatic Expansion Valve) is to:
A. Measure refrigerant charge
B. Control refrigerant flow based on evaporator superheat
C. Compress refrigerant vapor
D. Maintain system pressure
Rationale: TXVs regulate refrigerant flow into the evaporator by
responding to superheat conditions.
, 8. What is the function of a condenser coil?
A. To absorb heat
B. To reject heat from the refrigerant
C. To increase refrigerant pressure
D. To circulate refrigerant
Rationale: The condenser coil releases absorbed heat to the outside air
during the cooling process.
9. What does MERV stand for in filter ratings?
A. Minimum Evaporative Rating Value
B. Maximum Energy Recovery Value
C. Minimum Efficiency Reporting Value
D. Maximum Efficiency Rating Value
Rationale: MERV rates the effectiveness of air filters in trapping particles.
10.Which of the following best describes latent heat?
A. Heat that changes temperature
B. Heat that changes state without changing temperature
C. Heat loss due to friction
D. Heat absorbed by the condenser
Rationale: Latent heat refers to energy required for a phase change, such
as evaporation, without a temperature change.
11.What does the accumulator in a heat pump system prevent?
A. Overheating of refrigerant
B. Liquid refrigerant from entering the compressor
C. Air infiltration
D. Refrigerant leaks
Rationale: The accumulator traps liquid refrigerant to prevent
compressor damage.
12.In a duct system, static pressure is measured in:
A. PSI
B. Inches of water column
C. Pascals
D. BTUs
Actual Questions & Verified
Answers,Plus Rationales/Expert
Verified For Guaranteed Pass Graded
A+/2026 /Latest Update/Instant
Download Pdf
1. Which refrigerant is most commonly used in residential air conditioning
systems today?
A. R-12
B. R-410A
C. R-22
D. R-134a
Rationale: R-410A replaced R-22 due to EPA phase-out regulations and is
widely used in modern residential systems.
2. What is the primary purpose of an expansion valve in a refrigeration
cycle?
A. To compress refrigerant vapor
B. To reduce refrigerant pressure and temperature
C. To circulate air in the system
D. To remove moisture
Rationale: The expansion valve lowers the pressure and temperature of
the refrigerant before entering the evaporator.
3. The superheat reading is measured at which point in an HVAC system?
A. Compressor inlet
B. Evaporator outlet
C. Condenser inlet
, D. Metering device
Rationale: Superheat is the temperature of the vapor refrigerant above
its boiling point measured at the evaporator outlet.
4. What does SEER stand for in HVAC terminology?
A. Seasonal Electrical Energy Ratio
B. Seasonal Energy Efficiency Ratio
C. Standard Energy Efficiency Rating
D. Seasonal Efficiency Energy Rating
Rationale: SEER represents the cooling output during a season divided by
the total electrical energy input.
5. Which type of duct material provides the least air resistance?
A. Flexible duct
B. Sheet metal duct
C. Fiberboard duct
D. Plastic duct
Rationale: Sheet metal ducts have smooth interiors that reduce air
friction losses.
6. What is the minimum working clearance required in front of an electrical
panel per NEC?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
Rationale: NEC requires a 36-inch clearance in front of panels for safety
and maintenance access.
7. The purpose of a TXV (Thermostatic Expansion Valve) is to:
A. Measure refrigerant charge
B. Control refrigerant flow based on evaporator superheat
C. Compress refrigerant vapor
D. Maintain system pressure
Rationale: TXVs regulate refrigerant flow into the evaporator by
responding to superheat conditions.
, 8. What is the function of a condenser coil?
A. To absorb heat
B. To reject heat from the refrigerant
C. To increase refrigerant pressure
D. To circulate refrigerant
Rationale: The condenser coil releases absorbed heat to the outside air
during the cooling process.
9. What does MERV stand for in filter ratings?
A. Minimum Evaporative Rating Value
B. Maximum Energy Recovery Value
C. Minimum Efficiency Reporting Value
D. Maximum Efficiency Rating Value
Rationale: MERV rates the effectiveness of air filters in trapping particles.
10.Which of the following best describes latent heat?
A. Heat that changes temperature
B. Heat that changes state without changing temperature
C. Heat loss due to friction
D. Heat absorbed by the condenser
Rationale: Latent heat refers to energy required for a phase change, such
as evaporation, without a temperature change.
11.What does the accumulator in a heat pump system prevent?
A. Overheating of refrigerant
B. Liquid refrigerant from entering the compressor
C. Air infiltration
D. Refrigerant leaks
Rationale: The accumulator traps liquid refrigerant to prevent
compressor damage.
12.In a duct system, static pressure is measured in:
A. PSI
B. Inches of water column
C. Pascals
D. BTUs
