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

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

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

The positive work in isentropic expansion of liquid is very small
It leads to significant cost reduction
It improves the C.O.P., as the condenser is small
It considerably reduces mass of the system

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