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Discussion

Raising the pressure ratio beyond the optimum for maximum specific work

  • A.Has no effect on either
  • B.Reduces the net work per unit mass although efficiency still rises
  • C.Reduces both work and efficiency
  • D.Increases both work and efficiency indefinitely

Answer: B

Compressor work grows faster than turbine work once the pressure ratio is high, so the net work per kilogram falls. Ideal efficiency keeps rising, which is why the two criteria give different optimum pressure ratios and a designer must choose between them.

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