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An engine operating between 127^@C and 4...

An engine operating between `127^@C` and `47^@C` takes some specified amount of heat from a high temperature reservoir. Assuming that there are no frictional losses, calculate the percentage efficiency of an engine.

Text Solution

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Given : `T_1=127^@C`=127+273=400 K
`T_2=47^@C` =47+273=320 K
% efficiency `eta`= ?
`eta=[(T_1-T_2)/T_1]xx100`
`eta=[(400-320)/400]xx100`
`eta=[80/400]xx100`
`eta=20%`
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