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Refrigeration and Air Conditioning

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

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

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Refrigeration and Air Conditioning
A refrigerant compressor is used to

Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
Raise the pressure of the refrigerant
All of these

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Sub-cooled liquid
Liquid
Saturated liquid
Wet vapour

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at higher speeds
Raising the higher temperature
Operating the machine at lower speeds
Lowering the higher temperature

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Evaporator tubes
Condenser tubes
Capillary tubes
Refrigerant cooling tubes

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-77.7°C
-56.6°C
-75.2°C
-135.8°C

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MORE MCQ ON Refrigeration and Air Conditioning

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