Which statement is incorrect? (a) all reversible cycles have same efficiency (b) reversible cycle has more efficiency than an irreversible one (c) Carnot cycle is a reversible one (d) Carnot cycle has the maximum efficiency in all cycles.

Answer: (a). (a) Incorrect: reversible cycles have equal efficiency only when they work between the same two temperatures. (b), (c), (d) are correct statements (Carnot's theorem). So the incorrect statement is (a).

Which statement is incorrect? | JEE Main 2002 (AIEEE)

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Heat Engines, Refrigerators & Second Law

Which statement is incorrect?

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Answer: (a)

(a) Incorrect: reversible cycles have equal efficiency only when they work between the same two temperatures.
(b), (c), (d) are correct statements (Carnot's theorem).
So the incorrect statement is (a).

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