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Specific thrust is defined as

  • A.Thrust per unit engine weight
  • B.Thrust per unit frontal area
  • C.Thrust per unit mass flow of air
  • D.Thrust per unit fuel flow

Answer: C

It measures how hard the engine works each kilogram of air it takes in. A turbojet has high specific thrust and a high bypass turbofan a low one, which is why the latter needs a much larger engine to produce the same total thrust.

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