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

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

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Refrigeration and Air Conditioning
Which of the following statement is wrong?

None of the listed here
The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region
The value of C.O.P. is always greater than one
In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour

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