1.

Two heat engines A and B have their sources at 327^(@)C and 227^(@)C and sinks at 127^(@)C and 27^(@)C the ratio of their efficiencies is

Answer»

`6//5`
`5//6`
`2//5`
`5//2`

Solution :`(eta_(A))/(eta_(B))=(T_(1)-T_(2))/(T_(1))xx(T_(1))/(T_(1)'-T_(2)')`
`=(600-400)/(600)xx(500)/(500-300)=(2)/(6)xx(5)/(2)=(5)/(6)`.


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