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Thrust from a turbojet falls with altitude principally because

  • A.The fuel burns more slowly
  • B.Ram drag increases
  • C.Air density falls, reducing the mass flow through the engine
  • D.The nozzle expands less efficiently

Answer: C

Thrust follows mass flow almost directly and mass flow follows density. Falling ambient temperature partly offsets this by improving the cycle, so the real lapse is somewhat gentler than density scaling alone would predict.

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