A-7 Heating and Air Conditioning Certification Practice Test

1.   A technician installs a set of A/C gauges on a vehicle with poor A/C performance. The High side is Low and the Low side is High. This indicates a:

A Frozen evaporator

B Frozen expansion valve

C Restricted condenser

D Weak compressor

6.   Technician A says oil residue on an A/C hose may indicate a leak in the system. Technician B says its not necessary to replace the small amount of oil lost in the leak.  Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

2.   A vehicle blows warm air only when the heater is on high output. Technician A says this could be a restricted heater control valve. Technician B says this could be caused by a low coolant level. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

7.   Technician A says mineral oil is used to lubricate 134a A/C systems. Technician B says A/C oil mixes with the refrigerant to lubricate the compressor, seals, o-rings etc. in the A/C system. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

3.   Two technicians are discussing heat transfer in an automotive A/C system. Technician A says as refrigerant converts from a gas to a liquid it receives heat. Technician B says an expansion valve drops the pressure from the liquid line before it enters the evaporator.
Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

8.   A vehicle has a High - High Side pressure. All of these can cause this condition except:

A Restricted condenser

B No fan operation

C Overtightened A/C belt

D Overcharged system

4.   Technician A says a open A/C relay winding can prevent A/C clutch engagement. Technician B says a loose serpentine belt can prevent  clutch engagement. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

9.   Technician A says a frozen point on an A/C component or connection indicates a restriction in the system. Technician B says a frozen expansion valve will cause a Low - Low side pressure. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

5.   Technician A says evacuating an A/C system will remove moisture and humidity. Technician B says to evacuate the system any time it's been opened to the atmosphere. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

10.   Two technicians are discussing the cycling clutch system. Technician A says the temperature cycling clutch switch uses a bulb placed on the inlet port of the evaporator core. Technician B says a typical pressure cycling switch is located on the accumulator or the low side of a system. Who is Correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

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