HVAC Contractor Exam (C-20) Actual
Exam and Practice Tests Newest with
Complete Questions and Correct
Detailed Answers| Brand New Version!
1. What does HVAC stand for?
A. Heating, Ventilation, and Air Conditioning
B. Heating, Vacuum, and Air Cooling
C. Heat, Venting, and Air Circulation
D. Heating, Ventilation, and Appliance Control
Answer: A
Rationale: HVAC is the standard abbreviation for Heating, Ventilation, and Air
Conditioning.
2. What is the primary purpose of an HVAC system?
A. Produce electricity
B. Control indoor temperature, humidity, and air quality
C. Supply water
D. Generate fuel
Answer: B
Rationale: HVAC systems maintain comfortable and healthy indoor environments.
3. Which component is known as the heart of a refrigeration system?
A. Evaporator
B. Compressor
C. Condenser
D. Expansion valve
Answer: B
Rationale: The compressor circulates refrigerant throughout the system.
4. What is the primary function of the evaporator coil?
A. Reject heat
,B. Absorb heat from indoor air
C. Compress refrigerant
D. Store refrigerant
Answer: B
Rationale: The evaporator absorbs heat, cooling the indoor air.
5. What is the function of the condenser coil?
A. Absorb indoor heat
B. Reject heat to the outside environment
C. Filter air
D. Store refrigerant
Answer: B
Rationale: The condenser releases heat removed from the conditioned space.
6. Which refrigerant line carries low-pressure vapor back to the compressor?
A. Liquid line
B. Suction line
C. Drain line
D. Vent line
Answer: B
Rationale: The suction line returns refrigerant vapor to the compressor.
7. What device meters refrigerant into the evaporator?
A. Compressor
B. Thermostat
C. Expansion valve
D. Condenser
Answer: C
Rationale: The expansion valve controls refrigerant flow into the evaporator.
8. What is superheat?
A. Temperature above refrigerant saturation temperature
B. Temperature below freezing
C. Condenser pressure
D. Liquid refrigerant temperature only
, Answer: A
Rationale: Superheat measures heat added after refrigerant becomes vapor.
9. What is subcooling?
A. Cooling below room temperature
B. Cooling liquid refrigerant below its saturation temperature
C. Freezing refrigerant
D. Evaporator temperature
Answer: B
Rationale: Subcooling indicates liquid refrigerant has been cooled below
saturation.
10. What instrument measures electrical voltage?
A. Ammeter
B. Manometer
C. Voltmeter
D. Thermometer
Answer: C
Rationale: A voltmeter measures electrical potential difference.
11. What unit measures electrical resistance?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: B
Rationale: Resistance is measured in ohms.
12. What unit measures electrical current?
A. Ampere
B. Volt
C. Watt
D. Ohm
Answer: A
Rationale: Current flow is measured in amperes.
Exam and Practice Tests Newest with
Complete Questions and Correct
Detailed Answers| Brand New Version!
1. What does HVAC stand for?
A. Heating, Ventilation, and Air Conditioning
B. Heating, Vacuum, and Air Cooling
C. Heat, Venting, and Air Circulation
D. Heating, Ventilation, and Appliance Control
Answer: A
Rationale: HVAC is the standard abbreviation for Heating, Ventilation, and Air
Conditioning.
2. What is the primary purpose of an HVAC system?
A. Produce electricity
B. Control indoor temperature, humidity, and air quality
C. Supply water
D. Generate fuel
Answer: B
Rationale: HVAC systems maintain comfortable and healthy indoor environments.
3. Which component is known as the heart of a refrigeration system?
A. Evaporator
B. Compressor
C. Condenser
D. Expansion valve
Answer: B
Rationale: The compressor circulates refrigerant throughout the system.
4. What is the primary function of the evaporator coil?
A. Reject heat
,B. Absorb heat from indoor air
C. Compress refrigerant
D. Store refrigerant
Answer: B
Rationale: The evaporator absorbs heat, cooling the indoor air.
5. What is the function of the condenser coil?
A. Absorb indoor heat
B. Reject heat to the outside environment
C. Filter air
D. Store refrigerant
Answer: B
Rationale: The condenser releases heat removed from the conditioned space.
6. Which refrigerant line carries low-pressure vapor back to the compressor?
A. Liquid line
B. Suction line
C. Drain line
D. Vent line
Answer: B
Rationale: The suction line returns refrigerant vapor to the compressor.
7. What device meters refrigerant into the evaporator?
A. Compressor
B. Thermostat
C. Expansion valve
D. Condenser
Answer: C
Rationale: The expansion valve controls refrigerant flow into the evaporator.
8. What is superheat?
A. Temperature above refrigerant saturation temperature
B. Temperature below freezing
C. Condenser pressure
D. Liquid refrigerant temperature only
, Answer: A
Rationale: Superheat measures heat added after refrigerant becomes vapor.
9. What is subcooling?
A. Cooling below room temperature
B. Cooling liquid refrigerant below its saturation temperature
C. Freezing refrigerant
D. Evaporator temperature
Answer: B
Rationale: Subcooling indicates liquid refrigerant has been cooled below
saturation.
10. What instrument measures electrical voltage?
A. Ammeter
B. Manometer
C. Voltmeter
D. Thermometer
Answer: C
Rationale: A voltmeter measures electrical potential difference.
11. What unit measures electrical resistance?
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: B
Rationale: Resistance is measured in ohms.
12. What unit measures electrical current?
A. Ampere
B. Volt
C. Watt
D. Ohm
Answer: A
Rationale: Current flow is measured in amperes.
