AIIMS 2018 Physics Reversible Processes MCQ Question
Assertion: The efficiency of a reversible engine is maximum.
Reason: In such a device no dissipation of energy takes place.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Reversible engines achieve maximum efficiency because they operate without any entropy production, meaning there is no energy dissipation due to friction, turbulence, or other irreversible processes. This allows them to convert heat (Q) into work (W) with the highest possible efficiency, as described by the Carnot theorem, which states that the efficiency (η) of a reversible engine is determined by the temperatures of the heat reservoirs (T₁ and T₂) it operates between: η = 1 - (T₂/T₁). Other options are irrelevant as they do not accurately reflect the principles of thermodynamics governing reversible processes.
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