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Questions  

A Carnot engine whose sink is at a temperature of 300 K has an efficiency of 40%, By how much should the temperature of the source be increased so as to increase the efficiency to 60%

a
380 K
b
325 K
c
250 K
d
275 K

detailed solution

Correct option is C

40100=1−300T1  or  T1=500KFor 60% efficiency60100=1−300T1  or  T1=750KSo the temperature should be increased by750 - 500 = 250 K

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