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Questions  

Efficiency of a carnot engine operating between a source at temperature T1 and a sink at temperature T2 is 60%. If a carnot refrigerator operates between the same temperature limits, its coefficient of performance will be

a
2.450
b
1.252
c
0.823
d
0.666

detailed solution

Correct option is D

For the engine, η=1−T2T1⇒T2T1=1−ηFor the refrigerator, COP=T2T1−T2∴ COP=T2/T11−T2T1=1−η1−1−η=1η−1=10.6−1=0.666

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Coefficients of Performance of refrigerator and efficiency if it is working as a Carnot engine are αR and η and according to given figure then correct option.


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