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A turbojet produces its thrust

  • A.Mostly from a shaft driving a rotor
  • B.From a chemical reaction in the airframe
  • C.Entirely from the exhaust jet leaving the nozzle
  • D.Entirely from a propeller

Answer: C

All of the energy extracted from the gas appears as jet momentum rather than as shaft work. That gives a high exhaust velocity and suits high speed flight, but it is inefficient at low speed where the difference between jet and flight speed is largest.

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