MOBILE AIR CONDITIONING - Practice Mode

1) 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

Correct Answer: 1/2" - 16 ACME

2) 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

Correct Answer: Avoids cross contamination of refrigerants

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

Minimise air pollution Reduce global warming Increase water pollution Increase ozone depletion

Correct Answer: Reduce global warming

4) 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

Correct Answer: Selector switch and resistors

5) 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

Correct Answer: Circulate oil back to compressor

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