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Which of the following is not true of a scramjet?

  • A.It suits sustained hypersonic flight
  • B.It slows the flow to subsonic first
  • C.Combustion takes place in supersonic flow
  • D.It has no compressor or turbine

Answer: B

Decelerating hypersonic flow to subsonic speed would raise the temperature beyond any material's limit, which is precisely the difficulty the design avoids. The flow stays supersonic through the combustor, leaving milliseconds for mixing and burning.

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