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MRAC Set-1
Mobile Air Conditioning
16

Mobile Air Conditioning MCQ with Answers

16) Which size service port is used in automobile air conditioners for HFC-134a refrigerant?

1/4" - 13 ACME

1/2" - 16 ACME

3/8" - 15 ACME

5/16" - 14 ACME

Answer is:

1/2" - 16 ACME

Mobile Air Conditioning MCQ with Answers

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Related Mobile Air Conditioning MCQ with Answers

17) Why the service port fitting size differs in HFC-134a from CFC-12 car AC system?

Increases quantity of refrigerant charge

Decreases quantity of refrigerant charge

Avoids cross contamination of refrigerants

Improves performance of car air conditioners

Answer is:

Avoids cross contamination of refrigerants

18) What is the advantage of recycling R 134a refrigerant?

Minimise air pollution

Reduce global warming

Increase water pollution

Increase ozone depletion

Answer is:

Reduce global warming

19) Which controls the speed of blower fan motor to vary air cooling or heating in car AC?

Selector switch and resistors

Thermostat and return-air sensor

Ambient and cabinet temperature

Increase or decrease refrigerant flow

Answer is:

Selector switch and resistors

20) Why the miscibility of refrigerant and oil is preferred in car AC?

Lubricate the clutch assembly

Lubricate the heat exchangers

Circulate oil back to compressor

Lubricate the moving parts of TEV

Answer is:

Circulate oil back to compressor

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