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Question

Which of the following is NOT a feature of Carnot engine?

A.

It has the maximum efficiency among all the engines.

B.

The efficiency of Carnot engine is dependent on temperatures.

C.

It works with only one heat reservoir.

D.

For all Carnot engines, working under same temperature range has same efficiency.

Answer ( Option C)

It works with only one heat reservoir.

Solution

The Kelvin-Planck’s statement of the second law tells that it is impossible to construct a PMMSK, which receives energy as heat from a single thermal reservoir and delivers as equivalent amount of work.

Hence, the correct option is (C).

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