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MRAC
MRAC Set-1
Direct Expansion Air Conditioning
8

Direct Expansion Air Conditioning MCQ with Answers

8) Which valve is used for gas charging and pressure checking in central AC plants?

Safety valve

Service valve

Solenoid valve

Non return valve

Answer is:

Service valve

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Related Direct Expansion Air Conditioning MCQ with Answers

9) What is the value of absolute vacuum in millimeters of mercury?

-76

-760

-14.7

-10.33

Answer is:

-760

10) Which compressor is used only in central AC systems?

Scroll

Screw

Rotary

Centrifugal

Answer is:

Centrifugal

11) What is the benefit of preventive maintenance in AC plant?

Reduce water flow

Increase running cost

Prevent plant s break down

Decrease refrigerant charge

Answer is:

Prevent plant s break down

12) What is the method of flushing the indoor coils?

Using nitrogen

Pressurised air

Chemical cleaning

Mechanical cleaning

Answer is:

Using nitrogen

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