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Q.

Efficiency of an engine working on Carnot cycle is 60%. If the temperature of sink is decreased by 25% and that of the source in increased by 25%, then new efficiency of the engine will be

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a

56%

b

82%

c

76%

d

65%

answer is C.

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Detailed Solution

n=1−T2T1⇒0.6=1−T2T1⇒T2T1=0.4n1=1−T21T11=1−34T254T1=1−35.T2T1=(1−35×0.4)=76%
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