Wisconsin HVAC Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a Manual J load calculation?
A. Size ductwork
B. Determine refrigerant charge
C. Determine the heating and cooling load of a building
D. Calculate combustion efficiency
Answer: C
Rationale: Manual J is the industry standard for determining residential
heating and cooling loads before selecting HVAC equipment.
2. Which refrigerant has the highest ozone depletion potential?
A. R-410A
B. R-134a
, C. R-22
D. R-32
Answer: C
Rationale: R-22 is an HCFC refrigerant with ozone depletion potential and
is being phased out.
3. The purpose of a condenser is to:
A. Evaporate refrigerant
B. Increase humidity
C. Reject heat from the refrigerant
D. Filter refrigerant
Answer: C
Rationale: The condenser transfers heat from the refrigerant to the
surrounding air or water.
4. Superheat refers to:
A. Refrigerant below saturation temperature
B. Liquid refrigerant pressure
C. Vapor heated above its saturation temperature
D. Condenser temperature
Answer: C
,Rationale: Superheat confirms that only vapor enters the compressor.
5. Subcooling is:
A. Vapor below saturation
B. Liquid cooled below its saturation temperature
C. Air below freezing
D. Refrigerant boiling
Answer: B
Rationale: Subcooling ensures solid liquid refrigerant reaches the metering
device.
6. Which instrument measures airflow in a duct?
A. Megohmmeter
B. Psychrometer
C. Anemometer
D. Manometer
Answer: C
Rationale: An anemometer measures air velocity and airflow.
7. The primary function of an expansion valve is to:
A. Compress refrigerant
B. Reduce refrigerant pressure entering the evaporator
, C. Increase compressor speed
D. Store refrigerant
Answer: B
Rationale: The expansion device meters refrigerant and lowers its
pressure.
8. Relative humidity is:
A. Water vapor weight only
B. Percentage of moisture compared to the maximum air can hold at
that temperature
C. Atmospheric pressure
D. Dew point
Answer: B
Rationale: Relative humidity compares actual moisture content to
saturation.
9. A dirty evaporator coil generally causes:
A. Lower pressures only
B. Reduced airflow and reduced system efficiency
C. Higher airflow
D. Increased cooling capacity
Answer: B
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a Manual J load calculation?
A. Size ductwork
B. Determine refrigerant charge
C. Determine the heating and cooling load of a building
D. Calculate combustion efficiency
Answer: C
Rationale: Manual J is the industry standard for determining residential
heating and cooling loads before selecting HVAC equipment.
2. Which refrigerant has the highest ozone depletion potential?
A. R-410A
B. R-134a
, C. R-22
D. R-32
Answer: C
Rationale: R-22 is an HCFC refrigerant with ozone depletion potential and
is being phased out.
3. The purpose of a condenser is to:
A. Evaporate refrigerant
B. Increase humidity
C. Reject heat from the refrigerant
D. Filter refrigerant
Answer: C
Rationale: The condenser transfers heat from the refrigerant to the
surrounding air or water.
4. Superheat refers to:
A. Refrigerant below saturation temperature
B. Liquid refrigerant pressure
C. Vapor heated above its saturation temperature
D. Condenser temperature
Answer: C
,Rationale: Superheat confirms that only vapor enters the compressor.
5. Subcooling is:
A. Vapor below saturation
B. Liquid cooled below its saturation temperature
C. Air below freezing
D. Refrigerant boiling
Answer: B
Rationale: Subcooling ensures solid liquid refrigerant reaches the metering
device.
6. Which instrument measures airflow in a duct?
A. Megohmmeter
B. Psychrometer
C. Anemometer
D. Manometer
Answer: C
Rationale: An anemometer measures air velocity and airflow.
7. The primary function of an expansion valve is to:
A. Compress refrigerant
B. Reduce refrigerant pressure entering the evaporator
, C. Increase compressor speed
D. Store refrigerant
Answer: B
Rationale: The expansion device meters refrigerant and lowers its
pressure.
8. Relative humidity is:
A. Water vapor weight only
B. Percentage of moisture compared to the maximum air can hold at
that temperature
C. Atmospheric pressure
D. Dew point
Answer: B
Rationale: Relative humidity compares actual moisture content to
saturation.
9. A dirty evaporator coil generally causes:
A. Lower pressures only
B. Reduced airflow and reduced system efficiency
C. Higher airflow
D. Increased cooling capacity
Answer: B
