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An ideal heat engine exhausting heat at $77^{0} C$ is to have a 25% efficiency. It must take heat at

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1270C

2270C

3270C

1930C

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detailed solution

Correct option is D

η=1−T2T1 ⇒25100=1−(273+77)T1 T1=466k (or) 1930C

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An ideal heat engine exhausting heat at 770C is to have a 25% efficiency. It must take heat at

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An ideal heat engine exhausting heat at $77^{0} C$ is to have a 25% efficiency. It must take heat at