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Question: Answered & Verified by Expert
Which statement is incorrect?
PhysicsThermodynamicsJEE Main
Options:
  • 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
Solution:
2093 Upvotes Verified Answer
The correct answer is: All reversible cycles have same efficiency

The efficiency of all reversible cycles is determined by the temperature of the source and sink. Therefore, all reversible cycles do not have same efficiency.

An irreversible heat engine's efficiency is always lower than that of a reversible heat engine operating between the same two reservoirs.

The Carnot heat-engine cycle is described as a totally reversible cycle and has maximum efficiency in all cycles.

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