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A boundary layer diverter is fitted between the fuselage and the intake to

  • A.Reduce the intake weight
  • B.Provide cooling air for the nozzle
  • C.Keep boundary layer air out
  • D.Increase the captured mass flow

Answer: C

Boundary layer air is low in total pressure and highly distorted, and ingesting it degrades both recovery and compressor stability. The diverter costs drag and weight, which is the price paid for keeping that air out of the engine.

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