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In practice, all heat engines have efficiency less than that of a Carnot engine because

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Carnot engine is irreversible

A reversible process can never be attained in a real world

Irreversible engine has higher efficiency than reversible engine

Efficiency of Carnot engine is always one

answer is B.

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Detailed Solution

As per second law of thermodynamics no process is possible where there is complete conversion of heat to work. Hence, a reversible process is impossible.

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