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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
Atmospheric pressure
24 bars
56 bars

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

O.P/3.5
3.5/C.O.P.
3.5 × C.O.P.
None of these

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Carbon dioxide
Freon
Brine

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/hK
m²/hK
m/h

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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

4.33
2.33
3.33
1.33

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

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

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