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A carnot engine whose sink is at 300K has an efficiency of 40%. By how much should the temperature of the source be increased, so as to increase the efficiency by 50% of original efficiency?

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

detailed solution

Correct option is C

1−300T1=0.4⇒T1=500KNow  1−300T11=1.5×0.4=0.6⇒T11=750K∴  T11−T1=250K

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