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A turbofan differs from a turbojet in that

  • A.It has no compressor
  • B.It carries its own oxidiser
  • C.It produces thrust only from the core
  • D.A fan accelerates a bypass flow

Answer: D

Moving more air more slowly gives the same thrust at higher propulsive efficiency than a small fast jet does. That single change is why the turbofan displaced the turbojet on essentially every transport aircraft built since the nineteen sixties.

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