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Question

When the temperature difference between the source and the sink increases, the efficiency of the heat engine will

A
increase
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B
decrease
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C
is not affected
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D
may increase or decrease depending upon the nature of the working substance
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Solution

The correct option is A increase
The efficiency of the cycle is given as η=1T2T1. Here T1 is the temperature of the source and T2 is the temperature of the sink.

If the difference between temperature of the source and the sink is increased (i.e. temperature of source increase or temperature of sink decreases),
the T2T1 value decreases and thus efficiency increases.

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