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A high specific thrust always indicates a more efficient engine. Is this correct?

  • A.Yes, provided the pressure ratio is fixed
  • B.No, because specific thrust is unrelated to thrust
  • C.No, it indicates how hard each kilogram of air is worked
  • D.Yes, higher specific thrust means lower fuel burn

Answer: C

A turbojet has high specific thrust and poor subsonic fuel consumption, while a high bypass turbofan has the reverse. The figure describes engine size for a given thrust rather than the economy with which that thrust is produced.

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