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A scramjet differs from a ramjet in that

  • A.Combustion takes place in supersonic flow
  • B.It uses a compressor
  • C.It carries its own oxidiser
  • D.It works at rest

Answer: A

Decelerating hypersonic flow to subsonic speed would raise the temperature beyond what any material could survive, so the flow stays supersonic through the combustor. Mixing and burning fuel in milliseconds at those speeds is the central difficulty of the concept.

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