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An ideal heat engine exhausting heat at ...

An ideal heat engine exhausting heat at `77^(@)` is to have a 30% efficiency. It must take heat at

A

`127^(@)C`

B

`227^(@)C`

C

`327^(@)C`

D

`673^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
B
`0.3=1-(350)/(T_(1))`
`(350)/(T_(1))=0.7`
`therefore T_(1)=(350)/(0.7)=500K` or `227^(@)C`.
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