Q.

An ideal heat engine exhausting heat at 27°C is to have 25% efficiency. It must take heat at:

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a

127°c

b

227°c

c

327°C

d

673°C

answer is A.

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Detailed Solution

η=1-T2T1⇒0.25=1-300T1⇒T1=400 K=127oC
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An ideal heat engine exhausting heat at 27°C is to have 25% efficiency. It must take heat at: