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Severe over-expansion is preferable to under-expansion in a fixed nozzle. True or false?

  • A.True, provided the pressure ratio is high
  • B.False, because the two are equivalent
  • C.False, over-expansion can separate the flow and lose more
  • D.True, over-expansion recovers more energy

Answer: C

Under-expansion leaves some energy unconverted but keeps the flow attached and steady. Severe over-expansion produces shocks and possible separation inside the nozzle, costing more thrust and imposing unsteady side loads.

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