Question: A Carnot engine receiving heat at 400 K has an efficiency of 25% . The COP of a Carnot refrigerator working between the same temperature

A Carnot engine receiving heat at 400 K has an efficiency of 25% . The COP of a Carnot refrigerator working between the same temperature limits is

(a) 1

(b) 2

(c) 3

(d) 4

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