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MRAC Set-1
HVAC Plant
38

HVAC Plant MCQ with Answers

38) Why the crankcase heater is energised for compressor during the shut down period of AC plant?

Increase viscosity of crankcase oil

Decrease viscosity of crankcase oil

Increase miscibility of oil with refrigerant

Prevent oil foaming on restarting compressor

Answer is:

Prevent oil foaming on restarting compressor

HVAC Plant MCQ with Answers

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Related HVAC Plant MCQ with Answers

39) What is the equivalent of 1 mm of Hg in terms of microns?

500

1000

1500

2000

Answer is:

1000

40) Which tool is used for service valve operations in package AC?

Cutting pliers

Screw spanner

Ratchet key/wrench

Double end spanner

Answer is:

Ratchet key/wrench

41) Which is the minimum vaccum level preferred in microns before gas charging a system?

2000

1750

750

500

Answer is:

500

42) Which safety device is attached to nitrogen cylinder?

Fuse plug

Compound gauge

Two stage pressure regulator

Automatic pressure bypass valve

Answer is:

Two stage pressure regulator

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