HVAC Study Guide Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
Which device controls airflow direction in a duct system?
A) Diffuser
✔✔B) Damper
C) Blower motor
D) Heat exchanger
What is the main purpose of a heat exchanger?
A) Store refrigerant
✔✔B) Transfer heat without mixing fluids
C) Control airflow
D) Measure temperature
Which HVAC system provides both heating and cooling using electricity?
A) Gas furnace
✔✔B) Heat pump
C) Boiler
D) Radiator
What is superheat in refrigeration?
1
,A) Liquid refrigerant temperature
✔✔B) Temperature of vapor above its boiling point
C) Condenser pressure
D) Heat loss in ducts
Which component meters refrigerant into the evaporator?
A) Compressor
✔✔B) Expansion valve
C) Condenser coil
D) Receiver
What type of motor is commonly used in HVAC blowers?
A) Stepper motor
✔✔B) Induction motor
C) Servo motor
D) DC generator
What does SEER measure?
A) Heating capacity
✔✔B) Cooling efficiency
C) Airflow rate
D) Electrical resistance
2
,Which gas is commonly used in modern high-efficiency furnaces?
A) Propane only
✔✔B) Natural gas
C) Carbon monoxide
D) Oxygen
What is the purpose of an air filter in HVAC systems?
A) Increase humidity
✔✔B) Remove airborne particles
C) Raise air temperature
D) Reduce refrigerant pressure
Which HVAC component rejects heat to the outside air?
A) Evaporator
✔✔B) Condenser
C) Expansion valve
D) Thermostat
What is the primary function of an HVAC system?
A) Produce electricity
✔✔B) Control indoor temperature, humidity, and air quality
C) Generate water pressure
D) Provide lighting
3
, Which component of an HVAC system removes heat from indoor air?
A) Condenser
✔✔B) Evaporator coil
C) Thermostat
D) Expansion valve
What refrigerant property allows heat transfer in HVAC systems?
A) Density
✔✔B) Ability to change state
C) Color
D) Odor
Which HVAC component compresses refrigerant vapor?
A) Evaporator
✔✔B) Compressor
C) Condenser fan
D) Filter drier
What does BTU stand for?
A) Basic Thermal Unit
✔✔B) British Thermal Unit
C) Balanced Temperature Unit
4
Answers | Latest Version | 2025/2026 |
Correct & Verified
Which device controls airflow direction in a duct system?
A) Diffuser
✔✔B) Damper
C) Blower motor
D) Heat exchanger
What is the main purpose of a heat exchanger?
A) Store refrigerant
✔✔B) Transfer heat without mixing fluids
C) Control airflow
D) Measure temperature
Which HVAC system provides both heating and cooling using electricity?
A) Gas furnace
✔✔B) Heat pump
C) Boiler
D) Radiator
What is superheat in refrigeration?
1
,A) Liquid refrigerant temperature
✔✔B) Temperature of vapor above its boiling point
C) Condenser pressure
D) Heat loss in ducts
Which component meters refrigerant into the evaporator?
A) Compressor
✔✔B) Expansion valve
C) Condenser coil
D) Receiver
What type of motor is commonly used in HVAC blowers?
A) Stepper motor
✔✔B) Induction motor
C) Servo motor
D) DC generator
What does SEER measure?
A) Heating capacity
✔✔B) Cooling efficiency
C) Airflow rate
D) Electrical resistance
2
,Which gas is commonly used in modern high-efficiency furnaces?
A) Propane only
✔✔B) Natural gas
C) Carbon monoxide
D) Oxygen
What is the purpose of an air filter in HVAC systems?
A) Increase humidity
✔✔B) Remove airborne particles
C) Raise air temperature
D) Reduce refrigerant pressure
Which HVAC component rejects heat to the outside air?
A) Evaporator
✔✔B) Condenser
C) Expansion valve
D) Thermostat
What is the primary function of an HVAC system?
A) Produce electricity
✔✔B) Control indoor temperature, humidity, and air quality
C) Generate water pressure
D) Provide lighting
3
, Which component of an HVAC system removes heat from indoor air?
A) Condenser
✔✔B) Evaporator coil
C) Thermostat
D) Expansion valve
What refrigerant property allows heat transfer in HVAC systems?
A) Density
✔✔B) Ability to change state
C) Color
D) Odor
Which HVAC component compresses refrigerant vapor?
A) Evaporator
✔✔B) Compressor
C) Condenser fan
D) Filter drier
What does BTU stand for?
A) Basic Thermal Unit
✔✔B) British Thermal Unit
C) Balanced Temperature Unit
4
