Direct Expansion Air Conditioning MCQ with Answers

Direct Expansion Air Conditioning MCQ with Answers

26) What is the reason for short cycling of LP control switch in AC plant?

Answer is:

Shortage of refrigerant

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

Answer is:

All grille temperatures

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

Answer is:

Poor cooling

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

Answer is:

Defective oil heater/circuit

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

Answer is:

To lower the suction pressure close to 0.5 kg/cm²