HVAC Service Technician Practice Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control temperature, humidity, and air quality
C. Produce refrigerant
D. Measure airflow
Rationale: HVAC systems are designed to condition indoor air for
comfort and safety.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia
Rationale: R-410A is widely used due to its efficiency and lower
ozone impact.
3. What tool is used to measure electrical resistance?
A. Manifold gauge
B. Thermometer
C. Multimeter
, D. Psychrometer
Rationale: A multimeter measures resistance, voltage, and current.
4. What does BTU stand for?
A. Basic Thermal Unit
B. British Temperature Unit
C. British Thermal Unit
D. Balanced Thermal Utility
Rationale: BTU measures heat energy.
5. What is the function of a compressor?
A. Expand refrigerant
B. Increase refrigerant pressure and temperature
C. Cool air directly
D. Filter air
Rationale: The compressor circulates refrigerant through the
system.
6. What component removes moisture from air?
A. Evaporator
B. Compressor
C. Condenser
D. Dehumidifier coil (evaporator coil)
Rationale: The evaporator coil condenses moisture from air.
7. What does SEER stand for?
A. Seasonal Energy Efficiency Ratio
B. System Energy Exhaust Rating
C. Seasonal Energy Efficiency Ratio
D. Standard Electrical Efficiency Rate
Rationale: SEER measures cooling efficiency.
, 8. Which gas is most commonly used in combustion heating
systems?
A. Oxygen
B. Hydrogen
C. Natural gas
D. Helium
Rationale: Natural gas is the standard fuel for furnaces.
9. What is superheat?
A. Heat added to liquid refrigerant
B. Heat added to vapor refrigerant beyond boiling point
C. Heat removed from air
D. Heat in condenser coil
Rationale: Superheat ensures refrigerant is fully vaporized.
10. What tool measures airflow?
A. Voltmeter
B. Thermometer
C. Anemometer
D. Clamp meter
Rationale: Anemometers measure air velocity.
11. What is the purpose of a capacitor in an HVAC system?
A. Store refrigerant
B. Store and release electrical energy
C. Filter air
D. Heat air
Rationale: Capacitors help motors start and run efficiently.
12. What does a thermostat control?
A. Refrigerant flow
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control temperature, humidity, and air quality
C. Produce refrigerant
D. Measure airflow
Rationale: HVAC systems are designed to condition indoor air for
comfort and safety.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia
Rationale: R-410A is widely used due to its efficiency and lower
ozone impact.
3. What tool is used to measure electrical resistance?
A. Manifold gauge
B. Thermometer
C. Multimeter
, D. Psychrometer
Rationale: A multimeter measures resistance, voltage, and current.
4. What does BTU stand for?
A. Basic Thermal Unit
B. British Temperature Unit
C. British Thermal Unit
D. Balanced Thermal Utility
Rationale: BTU measures heat energy.
5. What is the function of a compressor?
A. Expand refrigerant
B. Increase refrigerant pressure and temperature
C. Cool air directly
D. Filter air
Rationale: The compressor circulates refrigerant through the
system.
6. What component removes moisture from air?
A. Evaporator
B. Compressor
C. Condenser
D. Dehumidifier coil (evaporator coil)
Rationale: The evaporator coil condenses moisture from air.
7. What does SEER stand for?
A. Seasonal Energy Efficiency Ratio
B. System Energy Exhaust Rating
C. Seasonal Energy Efficiency Ratio
D. Standard Electrical Efficiency Rate
Rationale: SEER measures cooling efficiency.
, 8. Which gas is most commonly used in combustion heating
systems?
A. Oxygen
B. Hydrogen
C. Natural gas
D. Helium
Rationale: Natural gas is the standard fuel for furnaces.
9. What is superheat?
A. Heat added to liquid refrigerant
B. Heat added to vapor refrigerant beyond boiling point
C. Heat removed from air
D. Heat in condenser coil
Rationale: Superheat ensures refrigerant is fully vaporized.
10. What tool measures airflow?
A. Voltmeter
B. Thermometer
C. Anemometer
D. Clamp meter
Rationale: Anemometers measure air velocity.
11. What is the purpose of a capacitor in an HVAC system?
A. Store refrigerant
B. Store and release electrical energy
C. Filter air
D. Heat air
Rationale: Capacitors help motors start and run efficiently.
12. What does a thermostat control?
A. Refrigerant flow
