ASE A7 Heating & Air Conditioning Practice
Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a vehicle’s air conditioning
system?
A. To reduce engine temperature
B. To increase fuel efficiency
C. To remove heat and humidity from the passenger
compartment
D. To improve exhaust gas recirculation
The A/C system is designed to provide a comfortable environment
inside the vehicle by removing heat and humidity from the cabin air.
2. Which refrigerant is most commonly used in modern vehicles?
A. R-12
B. R-134a
, C. R-22
D. R-410A
R-134a replaced R-12 due to environmental regulations. It is widely
used in automotive systems for its efficiency and lower ozone
depletion potential.
3. What is the function of the compressor in an A/C system?
A. To expand the refrigerant
B. To compress and circulate refrigerant through the system
C. To condense the refrigerant
D. To absorb heat from the passenger compartment
The compressor pressurizes the refrigerant, moving it through the
system to facilitate heat exchange.
4. A vehicle’s A/C system is not cooling properly, and the compressor
does not engage. What should be checked first?
A. Condenser fan
B. Expansion valve
C. Refrigerant level
D. Evaporator temperature
,Low refrigerant prevents proper system pressure, which can prevent
the compressor from engaging due to safety switches.
5. Which component removes heat from the high-pressure
refrigerant gas?
A. Evaporator
B. Receiver-drier
C. Condenser
D. Compressor
The condenser dissipates heat from the compressed, high-pressure
refrigerant gas, turning it into a high-pressure liquid.
6. What is the purpose of the expansion valve in an A/C system?
A. To compress refrigerant
B. To heat the refrigerant
C. To reduce refrigerant pressure and control flow to the
evaporator
D. To remove moisture from refrigerant
The expansion valve meters refrigerant into the evaporator at low
pressure, allowing efficient heat absorption.
, 7. What tool is required to check the pressure in an automotive A/C
system?
A. Torque wrench
B. Multimeter
C. Manifold gauge set
D. Vacuum pump
Manifold gauges measure high- and low-side pressures in the A/C
system, essential for diagnosis and service.
8. Which of the following could cause ice to form on the evaporator?
A. Low refrigerant
B. High cabin humidity
C. Restricted airflow across the evaporator
D. Overcharged system
Restricted airflow prevents proper heat transfer, causing refrigerant to
drop below freezing and ice to form on the evaporator.
9. What is the purpose of the receiver-drier or accumulator in an A/C
system?
Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a vehicle’s air conditioning
system?
A. To reduce engine temperature
B. To increase fuel efficiency
C. To remove heat and humidity from the passenger
compartment
D. To improve exhaust gas recirculation
The A/C system is designed to provide a comfortable environment
inside the vehicle by removing heat and humidity from the cabin air.
2. Which refrigerant is most commonly used in modern vehicles?
A. R-12
B. R-134a
, C. R-22
D. R-410A
R-134a replaced R-12 due to environmental regulations. It is widely
used in automotive systems for its efficiency and lower ozone
depletion potential.
3. What is the function of the compressor in an A/C system?
A. To expand the refrigerant
B. To compress and circulate refrigerant through the system
C. To condense the refrigerant
D. To absorb heat from the passenger compartment
The compressor pressurizes the refrigerant, moving it through the
system to facilitate heat exchange.
4. A vehicle’s A/C system is not cooling properly, and the compressor
does not engage. What should be checked first?
A. Condenser fan
B. Expansion valve
C. Refrigerant level
D. Evaporator temperature
,Low refrigerant prevents proper system pressure, which can prevent
the compressor from engaging due to safety switches.
5. Which component removes heat from the high-pressure
refrigerant gas?
A. Evaporator
B. Receiver-drier
C. Condenser
D. Compressor
The condenser dissipates heat from the compressed, high-pressure
refrigerant gas, turning it into a high-pressure liquid.
6. What is the purpose of the expansion valve in an A/C system?
A. To compress refrigerant
B. To heat the refrigerant
C. To reduce refrigerant pressure and control flow to the
evaporator
D. To remove moisture from refrigerant
The expansion valve meters refrigerant into the evaporator at low
pressure, allowing efficient heat absorption.
, 7. What tool is required to check the pressure in an automotive A/C
system?
A. Torque wrench
B. Multimeter
C. Manifold gauge set
D. Vacuum pump
Manifold gauges measure high- and low-side pressures in the A/C
system, essential for diagnosis and service.
8. Which of the following could cause ice to form on the evaporator?
A. Low refrigerant
B. High cabin humidity
C. Restricted airflow across the evaporator
D. Overcharged system
Restricted airflow prevents proper heat transfer, causing refrigerant to
drop below freezing and ice to form on the evaporator.
9. What is the purpose of the receiver-drier or accumulator in an A/C
system?
