engineering recuitment UPCL AE (E&M) 2021 Mock Test Refrigeration and Air Conditioning Refrigeration Cycles and Devices Heat Engine, Heat Pump and Refrigerator

Which one of the following expressions is correct?

1

COP_{Heat pump}= COP_Refrigerator - 2

2

COP_{Heat pump} = COP_Refrigerator + 2

3

COP_{Heat pump}= COPRefrigerator - 1

4

COP_{Heat pump}= COP_Refrigerator + 1

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