Question

what is the efficiency of Carnot engine when temperature of source and sink are equal.​

Answer 1

For a Carnot engine when temperature of source and sink are equal.

➡️The thermal efficiency will be Zero ( 0 ).

➡️ If temperature of both the source and sink are same then there is no heat engine. It will not work. A cyclic process will not be achieved.

➡️Further in a reversible cycle (Carnot engine) net change in entropy is zero.

Know More :

In any practical heat engine which are used in vehicles (with two reservoirs) cycle is irreversible hence net entropy change is always non zero.

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Answer 2

The efficiency of a Carnot's engine at a particular source and sink temperature is 12 . When the sink temperature is reduced by 100∘C, the engine efficiency, becomes 23.

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