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MRAC Set-1
Direct Expansion Air Conditioning
27

Direct Expansion Air Conditioning MCQ with Answers

27) Which parameters in log sheet indicate the air blocking in ducts?

All grille temperatures

Liquid line temperature

Inlet and outlet temperature of chillier

Temperatures in chilled water system

Answer is:

All grille temperatures

Direct Expansion Air Conditioning MCQ with Answers

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Related Direct Expansion Air Conditioning MCQ with Answers

28) What is the effect on system performance if the AC system is at undercharged condition?

Poor cooling

Excess cooling

Compressor over loading

Compressor trips by HP cut out

Answer is:

Poor cooling

29) What is the cause of oil foaming in compressor crankcase at the time of starting?

Poor condensation

Damaged oil separator

Excess oil in crankcase

Defective oil heater/circuit

Answer is:

Defective oil heater/circuit

30) Why the LP cut out control is bypassed electrically before pump down operation?

Avoid oil foaming

Prevent liquid entry to compressor

Increase current of the compressor motor

To lower the suction pressure close to 0.5 kg/cm²

Answer is:

To lower the suction pressure close to 0.5 kg/cm²

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