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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Air conditioning
Domestic refrigerators
Gas liquefaction
Commercial refrigerators

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

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

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Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Less than
None of the listed here
Greater than
Equal to

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

Condenser tubes
Capillary tubes
Evaporator tubes
Refrigerant cooling tubes

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Refrigeration and Air Conditioning
For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

Anything
High
Equal
Small

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Equal to critical temperature
Reduced to a value below its critical temperature
None of these
Increased to a value above its critical temperature

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