Wisconsin HVAC Qualifier Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which organization publishes the International Mechanical Code
(IMC)?
A. ASHRAE
B. NFPA
C. International Code Council (ICC)
D. ACCA
Answer: C. International Code Council (ICC)
Rationale: The International Code Council develops and publishes the
International Mechanical Code, which serves as the basis for mechanical
regulations in many jurisdictions.
2. What is the primary purpose of a Manual J calculation?
A. Size ductwork
, B. Determine refrigerant charge
C. Calculate residential heating and cooling loads
D. Balance air distribution
Answer: C. Calculate residential heating and cooling loads
Rationale: ACCA Manual J determines building heating and cooling loads
to properly size HVAC equipment.
3. Which refrigerant has zero ozone depletion potential?
A. R-22
B. R-12
C. R-410A
D. R-11
Answer: C. R-410A
Rationale: R-410A does not contain chlorine and therefore has zero ozone
depletion potential, although it has a relatively high global warming
potential.
4. What device controls refrigerant flow into an evaporator based on
superheat?
A. Check valve
B. Solenoid valve
, C. Thermostatic Expansion Valve (TXV)
D. Pressure switch
Answer: C. Thermostatic Expansion Valve (TXV)
Rationale: A TXV regulates refrigerant flow to maintain proper evaporator
superheat.
5. Which electrical instrument measures current without disconnecting
conductors?
A. Voltmeter
B. Ohmmeter
C. Clamp meter
D. Megohmmeter
Answer: C. Clamp meter
Rationale: A clamp meter measures current by sensing the magnetic field
surrounding a conductor.
6. What is latent heat primarily associated with?
A. Temperature change
B. Pressure increase
C. Phase change
D. Air velocity
Answer: C. Phase change
, Rationale: Latent heat is absorbed or released during a change of state
without changing temperature.
7. Which component compresses low-pressure refrigerant vapor?
A. Evaporator
B. Condenser
C. Receiver
D. Compressor
Answer: D. Compressor
Rationale: The compressor raises refrigerant pressure and temperature
before it enters the condenser.
8. A dirty evaporator coil most commonly causes:
A. Higher airflow
B. Lower humidity
C. Reduced system efficiency
D. Increased refrigerant pressure
Answer: C. Reduced system efficiency
Rationale: Dirt restricts heat transfer and airflow, reducing cooling
performance and efficiency.
9. Which gas is commonly used for pressure testing refrigeration piping?
A. Oxygen
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which organization publishes the International Mechanical Code
(IMC)?
A. ASHRAE
B. NFPA
C. International Code Council (ICC)
D. ACCA
Answer: C. International Code Council (ICC)
Rationale: The International Code Council develops and publishes the
International Mechanical Code, which serves as the basis for mechanical
regulations in many jurisdictions.
2. What is the primary purpose of a Manual J calculation?
A. Size ductwork
, B. Determine refrigerant charge
C. Calculate residential heating and cooling loads
D. Balance air distribution
Answer: C. Calculate residential heating and cooling loads
Rationale: ACCA Manual J determines building heating and cooling loads
to properly size HVAC equipment.
3. Which refrigerant has zero ozone depletion potential?
A. R-22
B. R-12
C. R-410A
D. R-11
Answer: C. R-410A
Rationale: R-410A does not contain chlorine and therefore has zero ozone
depletion potential, although it has a relatively high global warming
potential.
4. What device controls refrigerant flow into an evaporator based on
superheat?
A. Check valve
B. Solenoid valve
, C. Thermostatic Expansion Valve (TXV)
D. Pressure switch
Answer: C. Thermostatic Expansion Valve (TXV)
Rationale: A TXV regulates refrigerant flow to maintain proper evaporator
superheat.
5. Which electrical instrument measures current without disconnecting
conductors?
A. Voltmeter
B. Ohmmeter
C. Clamp meter
D. Megohmmeter
Answer: C. Clamp meter
Rationale: A clamp meter measures current by sensing the magnetic field
surrounding a conductor.
6. What is latent heat primarily associated with?
A. Temperature change
B. Pressure increase
C. Phase change
D. Air velocity
Answer: C. Phase change
, Rationale: Latent heat is absorbed or released during a change of state
without changing temperature.
7. Which component compresses low-pressure refrigerant vapor?
A. Evaporator
B. Condenser
C. Receiver
D. Compressor
Answer: D. Compressor
Rationale: The compressor raises refrigerant pressure and temperature
before it enters the condenser.
8. A dirty evaporator coil most commonly causes:
A. Higher airflow
B. Lower humidity
C. Reduced system efficiency
D. Increased refrigerant pressure
Answer: C. Reduced system efficiency
Rationale: Dirt restricts heat transfer and airflow, reducing cooling
performance and efficiency.
9. Which gas is commonly used for pressure testing refrigeration piping?
A. Oxygen
