NATE Certified HVAC Professional
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. What is the primary purpose of a capacitor in an HVAC system?
A. Increase voltage
B. Store and release electrical energy
C. Reduce current flow
D. Control refrigerant flow
Answer: B
Rationale: Capacitors store electrical energy and release it to help start
and run motors efficiently.
2. Which refrigerant is commonly used as a replacement for R-22?
A. R-12
B. R-134a
C. R-410A
D. R-717
Answer: C
Rationale: R-410A is widely used as an environmentally safer alternative
to R-22.
,3. What does SEER stand for?
A. Seasonal Energy Efficiency Ratio
B. System Energy Efficiency Rating
C. Seasonal Energy Efficiency Rating
D. System Efficiency Energy Ratio
Answer: A
Rationale: SEER measures cooling efficiency over a typical cooling season.
4. Which component compresses refrigerant vapor?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Answer: C
Rationale: The compressor increases pressure and temperature of
refrigerant vapor.
5. What is superheat?
A. Heat removed from air
B. Heat added beyond boiling point
C. Heat below freezing
D. Heat lost in condenser
Answer: B
Rationale: Superheat is the temperature increase of vapor above its
saturation point.
6. Which tool measures refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Hygrometer
D. Anemometer
Answer: B
Rationale: A manifold gauge set is used to measure system pressures.
, 7. What is the function of an evaporator coil?
A. Release heat
B. Absorb heat
C. Compress refrigerant
D. Store refrigerant
Answer: B
Rationale: The evaporator absorbs heat from indoor air.
8. Which electrical device protects against overcurrent?
A. Capacitor
B. Transformer
C. Fuse
D. Relay
Answer: C
Rationale: Fuses interrupt circuits when excessive current flows.
9. What is airflow measured in?
A. PSI
B. BTU
C. CFM
D. Ohms
Answer: C
Rationale: Airflow is measured in cubic feet per minute.
10.What is the purpose of a thermostat?
A. Control humidity
B. Control temperature
C. Control airflow
D. Control voltage
Answer: B
Rationale: Thermostats regulate temperature by controlling system
operation.
11.Which law relates voltage, current, and resistance?
A. Boyle’s Law
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. What is the primary purpose of a capacitor in an HVAC system?
A. Increase voltage
B. Store and release electrical energy
C. Reduce current flow
D. Control refrigerant flow
Answer: B
Rationale: Capacitors store electrical energy and release it to help start
and run motors efficiently.
2. Which refrigerant is commonly used as a replacement for R-22?
A. R-12
B. R-134a
C. R-410A
D. R-717
Answer: C
Rationale: R-410A is widely used as an environmentally safer alternative
to R-22.
,3. What does SEER stand for?
A. Seasonal Energy Efficiency Ratio
B. System Energy Efficiency Rating
C. Seasonal Energy Efficiency Rating
D. System Efficiency Energy Ratio
Answer: A
Rationale: SEER measures cooling efficiency over a typical cooling season.
4. Which component compresses refrigerant vapor?
A. Evaporator
B. Condenser
C. Compressor
D. Expansion valve
Answer: C
Rationale: The compressor increases pressure and temperature of
refrigerant vapor.
5. What is superheat?
A. Heat removed from air
B. Heat added beyond boiling point
C. Heat below freezing
D. Heat lost in condenser
Answer: B
Rationale: Superheat is the temperature increase of vapor above its
saturation point.
6. Which tool measures refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Hygrometer
D. Anemometer
Answer: B
Rationale: A manifold gauge set is used to measure system pressures.
, 7. What is the function of an evaporator coil?
A. Release heat
B. Absorb heat
C. Compress refrigerant
D. Store refrigerant
Answer: B
Rationale: The evaporator absorbs heat from indoor air.
8. Which electrical device protects against overcurrent?
A. Capacitor
B. Transformer
C. Fuse
D. Relay
Answer: C
Rationale: Fuses interrupt circuits when excessive current flows.
9. What is airflow measured in?
A. PSI
B. BTU
C. CFM
D. Ohms
Answer: C
Rationale: Airflow is measured in cubic feet per minute.
10.What is the purpose of a thermostat?
A. Control humidity
B. Control temperature
C. Control airflow
D. Control voltage
Answer: B
Rationale: Thermostats regulate temperature by controlling system
operation.
11.Which law relates voltage, current, and resistance?
A. Boyle’s Law
