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If the temperatures of source and sink o...

If the temperatures of source and sink of a Carnot engine having efficiency `eta` are each decreased by 100 K, then the efficiency

A

remains constant

B

becomes 1

C

decreases

D

increases

Text Solution

Verified by Experts

The correct Answer is:
D
In starting the efficiency
`eta = 1 - (T_2)/(T_1) = (T_1 - T_2)/(T_1)`
On decreased by 100 K each the efficiency
`eta = 1 - (T_2 - 100)/(T_2 - 100) = (T_1 - T_2)/( T_1 - 100)`
In this case the efficiency will increases.
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