TENNESSEE HVAC CONTRACTOR EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALES Q&A 2026 |IINSTANT
DOWNLOAD PDF
1. What is the primary function of an HVAC system?
A. Produce electricity
B. Control temperature, humidity, and air quality
C. Pump water through pipes
D. Provide lighting
Correct Answer: B
Rationale: HVAC stands for Heating, Ventilation, and Air
Conditioning. Its main role is maintaining comfortable indoor
environmental conditions.
2. What refrigerant property allows it to absorb heat during
evaporation?
A. High density
B. High boiling point
C. Latent heat of vaporization
D. Electrical resistance
Correct Answer: C
,Rationale: Refrigerants absorb heat when changing from liquid
to vapor due to their latent heat of vaporization.
3. Which HVAC component compresses refrigerant vapor in a
refrigeration cycle?
A. Condenser
B. Compressor
C. Evaporator
D. Expansion valve
Correct Answer: B
Rationale: The compressor increases refrigerant pressure and
temperature before it moves to the condenser.
4. What does HVAC stand for?
A. Heat Vent Air Control
B. Heat Ventilation Air Cooling
C. Heating Ventilation and Air Conditioning
D. Heating Ventilation Air Cycle
Correct Answer: C
Rationale: HVAC is the industry abbreviation for Heating,
Ventilation, and Air Conditioning.
5. Which device meters refrigerant into the evaporator?
A. Compressor
,B. Expansion valve
C. Blower
D. Condenser fan
Correct Answer: B
Rationale: The expansion valve or metering device controls
refrigerant flow into the evaporator.
6. What unit measures air flow in HVAC systems?
A. PSI
B. BTU
C. CFM
D. Ohms
Correct Answer: C
Rationale: Cubic Feet per Minute (CFM) measures air
movement through ducts.
7. Which HVAC component removes heat from indoor air?
A. Furnace
B. Evaporator coil
C. Thermostat
D. Filter
Correct Answer: B
Rationale: The evaporator coil absorbs heat from indoor air
during the cooling process.
, 8. What is the purpose of a thermostat?
A. Regulate refrigerant flow
B. Control system temperature settings
C. Pump refrigerant
D. Remove moisture
Correct Answer: B
Rationale: A thermostat monitors room temperature and
signals the HVAC system to start or stop.
9. Which electrical device protects HVAC circuits from
overload?
A. Capacitor
B. Fuse or circuit breaker
C. Relay
D. Contactor
Correct Answer: B
Rationale: Fuses and circuit breakers interrupt power during
excessive current conditions.
10. What unit measures heat energy used in HVAC
calculations?
A. Watts
B. Volts
AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALES Q&A 2026 |IINSTANT
DOWNLOAD PDF
1. What is the primary function of an HVAC system?
A. Produce electricity
B. Control temperature, humidity, and air quality
C. Pump water through pipes
D. Provide lighting
Correct Answer: B
Rationale: HVAC stands for Heating, Ventilation, and Air
Conditioning. Its main role is maintaining comfortable indoor
environmental conditions.
2. What refrigerant property allows it to absorb heat during
evaporation?
A. High density
B. High boiling point
C. Latent heat of vaporization
D. Electrical resistance
Correct Answer: C
,Rationale: Refrigerants absorb heat when changing from liquid
to vapor due to their latent heat of vaporization.
3. Which HVAC component compresses refrigerant vapor in a
refrigeration cycle?
A. Condenser
B. Compressor
C. Evaporator
D. Expansion valve
Correct Answer: B
Rationale: The compressor increases refrigerant pressure and
temperature before it moves to the condenser.
4. What does HVAC stand for?
A. Heat Vent Air Control
B. Heat Ventilation Air Cooling
C. Heating Ventilation and Air Conditioning
D. Heating Ventilation Air Cycle
Correct Answer: C
Rationale: HVAC is the industry abbreviation for Heating,
Ventilation, and Air Conditioning.
5. Which device meters refrigerant into the evaporator?
A. Compressor
,B. Expansion valve
C. Blower
D. Condenser fan
Correct Answer: B
Rationale: The expansion valve or metering device controls
refrigerant flow into the evaporator.
6. What unit measures air flow in HVAC systems?
A. PSI
B. BTU
C. CFM
D. Ohms
Correct Answer: C
Rationale: Cubic Feet per Minute (CFM) measures air
movement through ducts.
7. Which HVAC component removes heat from indoor air?
A. Furnace
B. Evaporator coil
C. Thermostat
D. Filter
Correct Answer: B
Rationale: The evaporator coil absorbs heat from indoor air
during the cooling process.
, 8. What is the purpose of a thermostat?
A. Regulate refrigerant flow
B. Control system temperature settings
C. Pump refrigerant
D. Remove moisture
Correct Answer: B
Rationale: A thermostat monitors room temperature and
signals the HVAC system to start or stop.
9. Which electrical device protects HVAC circuits from
overload?
A. Capacitor
B. Fuse or circuit breaker
C. Relay
D. Contactor
Correct Answer: B
Rationale: Fuses and circuit breakers interrupt power during
excessive current conditions.
10. What unit measures heat energy used in HVAC
calculations?
A. Watts
B. Volts
