Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Using reagents
Halide torch which on detection produces greenish flame lighting
Sulphur sticks which on detection gives white smoke
Smelling

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

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
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

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