ASE Practice Test (A7: Heating & Air Conditioning)

Question 1

Power and ground at the clutch coil are good, but the compressor clutch will not engage. Which of the following is the MOST LIKELY reason for the problem?

Accepted Answer

Incorrect air gap

Answer

Bad pressure cycling switch

Answer

Low refrigerant

Answer

Locked-up compressor

Question 2

An unknown refrigerant is discovered prior to recovery. The technician should be able to:

Accepted Answer

recover it and treat it as contaminated

Answer

recover it and recycle it as R-12

Answer

recover it and recycle it as R-134a

Answer

discharge it into the atmosphere

Question 3

The following statements about air conditioning performance test are true, EXCEPT:

Accepted Answer

To avoid evaporator odor, you want to operate the AC in RECIRC instead of FRESH

Answer

Obstructions of the cabin filter might create insufficient air circulation

Answer

Road debris might clog the condenser fins which lead to a decrease in performance

Answer

If the passenger side floor is wet, it could be a clogged evaporator drain line.

Question 4

At low speeds and stop lights, a vehicle's air conditioning performance is reduced, but it cools at highway speeds. Which of the following is the MOST LIKELY cause of this condition?

Accepted Answer

A missing fan shroud.

Answer

A normal condition.

Answer

A low refriderant charge.

Answer

A faulty compressore clutch relay.

Question 5

If the condenser fan wasn't working, what high- and low-side pressure gauge values would a technician find?

Accepted Answer

Both high-side high and low-side are high

Answer

High-side low and low-side high

Answer

High-side high and low-side low

Answer

Both high-side high and low-side are low

Question 6

The compressor clutch isn't going to engage. The technician discovers 14.2V and a good ground at the clutch coil connector during testing. Which of these possibly be the source of the problem?

Accepted Answer

An incorrect air gap

Answer

A bad pressure cycling switch

Answer

A seized compressor

Answer

A low refrigerant level

Question 7

Technician X states that when the condenser airflow is restricted, the pressure is high in both the high and low lines. Technician Y states that when both high and low sides show low pressure, it’s often an indication of low refrigerant. Who is correct?

Accepted Answer

Both technicians

Answer

Neither technician

Answer

Technician X

Answer

Technician Y

Question 8

A frozen spot is noticed in the center of the condenser. Technician X says a frozen spot on a component or connection indicates a restriction in the system. Technician Y says this is caused Too much freon. Who is correct?

Accepted Answer

Technician X

Answer

Both technicians

Answer

Neither technician

Answer

Technician Y

Question 9

Which of the following factors is most likely to cause a car to overheat?

Accepted Answer

Clogged radiator

Answer

Electric cooling fan runs all the time

Answer

Restricted heater core

Answer

Thermostat stuck open

Question 10

Technician X says that evacuating an A/C system will remove air and moisture from the system. Technician Y says that evacuating an A/C system will remove dirt particles from the system. Who is right?

Accepted Answer

X only

Answer

Both X and Y

Answer

Neither X nor Y

Answer

Y only