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An ideal engine whose low-temperature re...

An ideal engine whose low-temperature reservoir is at `27^@C` has an efficiency of 40%. By how much should the temperature of the high-temperature reservoir be increased so as to increase the efficiency to 50% ?

A

`100^@C`

B

`600^@C`

C

`375K`

D

`600K`

Text Solution

Verified by Experts

The correct Answer is:
A
`eta = 1 - 300/(T_1)`
`1 - 40/100 implies T_(1) = 500 K`
Now `eta' = 1/2 = 1 - 300/T implies T = 600 K`
So, increase in high temperature = 100 K
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