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Propulsive efficiency describes

  • A.Jet energy becoming thrust power
  • B.The fraction of fuel energy released in combustion
  • C.The efficiency of the compressor alone
  • D.The ratio of thrust to engine weight

Answer: A

It rises as the jet velocity approaches the flight velocity, and would reach unity if they were equal, at which point the thrust would be zero. That tension between efficiency and thrust is what sets the optimum jet velocity for a given flight speed.

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