Efficiency of the Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of coefficient of performance of reversed Carnot cycle refrigerator?

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SSC JE ME Previous Paper 16 ( Held on: 1 March 2017 Evening)
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  1. 1.25
  2. 0.8
  3. 0.5
  4. 0.25

Answer (Detailed Solution Below)

Option 4 : 0.25
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Detailed Solution

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Concept:

Carnot Cycle:

Reversed Carnot Cycle:

By reversing the Carnot cycle we can have either heat pump or refrigerator.

COP of Reversed Carnot cycle (H.P):

COP of Refrigerator:

Calculation:

Given: η = 0.8

Using the relation 

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