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Overall efficiency of a propulsion system is

  • A.Thermal efficiency alone
  • B.Propulsive efficiency alone
  • C.The product of thermal and propulsive efficiency
  • D.The sum of thermal and propulsive efficiency

Answer: C

A high thermal efficiency wasted on a poorly matched jet velocity gives a disappointing result, and so does the reverse. The turbofan succeeded precisely because it improved propulsive efficiency without sacrificing the thermal efficiency of the core.

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