Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance) ?
Correct answer: C. Air cycle
- A. Ordinary vapour compression cycle
- B. Carnot cycle
- C. Air cycle
- D. Vapour compression with a reversible expansion engine
Explanation
The Carnot refrigerator has the maximum possible COP, while reversible expansion improves vapour-cycle performance. Air refrigeration cycles generally have the lowest COP because the gas undergoes large compression and expansion work with relatively small refrigeration effect.
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