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The temperature -entropy diagram of a re...

The temperature -entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

A

`1/3`

B

`2/3`

C

`1/2`

D

`1/4`

Text Solution

Verified by Experts

The correct Answer is:
A
`Q_(1) =T_(o)S_(o) +1/2 T_(o)S_(o) =3/2 T_(o) S_(o)`

`Q_(2) =T_(o) (2S_(o) -S_(o))=T_(o) S_(o)`
`Q_(3) =0`
`therefore n =(W)/(Q_(1)) =(Q_(1)-Q_(2))/( Q_(1))`
`=1 -(Q_(2))/(Q_(1))=1- 2/3 =1/3 `
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