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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

2.33
3.33
4.33
1.33

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-77.7°C
-135.8°C
-75.2°C
-56.6°C

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Refrigeration and Air Conditioning
The value of C.O.P in vapour compression cycle is usually

Any one of the above
Equal to unity
Always more than unity
Always less than unity

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

P.F. - 1
1 + B.P.F.
1/ B.P.F.
1 - B.P.F.

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Refrigeration and Air Conditioning
The pressure at the outlet of a refrigerant compressor is called

Critical pressure
Back pressure
Discharge pressure
Suction pressure

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Refrigeration and Air Conditioning
The dehumidification process, on the psychrometric chart, is shown by

Vertical line
Horizontal line
Inclined line
Curved line

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MORE MCQ ON Refrigeration and Air Conditioning

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