1. The compression ratio in each stage should be same
  2. The intercooling should be perfect
  3. The work-done in each stage should be same
  4. All of the above
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Answer: Option 4

For minimum work required to compress and deliver a quantity of air by multistage compression -The compression ratio in each stage should be same -The intercooling should be perfect - The work-done in each stage should be same

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