Which of the following processes cannot be made reversible even under ideal condition of operation ?
Correct answer: A. Free expansion of a gas
- A. Free expansion of a gas
- B. Compression of air in a compressor
- C. Expansion of steam in a turbine
- D. All (A), B. & (C)
Explanation
Free expansion occurs against no opposing pressure and produces entropy, so it cannot be reversed without leaving changes in the system or surroundings. Compressor compression and turbine expansion can be idealised as reversible through quasistatic, frictionless operation.
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