1.

A Carnot engine takes 3 xx 10^(6) cals of heat from a reservoir at 627^(@)C and gives it to a sink at 27^(@)C. The work done by the engine is:

Answer»

`4 cdot 2xx10^(6)J`
`16 cdot 8xx10^(6)J`
`8 cdot 4XX10^(6)J`
`3xx10^(6)J`

Solution :`eta =1-(T_(2))/(T_(1))=1-(300)/(900)=(2)/(3)`
Work `=N cdot Q_(1)=(2)/(3) xx 3xx 10^(6)=2xx10^(6)` cal.
`=8 cdot 4xx10^(6)` J
`therefore` Correct choice is (c ).


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