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The engine type suited to sustained hypersonic flight is the

  • A.Turboprop
  • B.Reciprocating engine
  • C.Scramjet
  • D.Turbofan

Answer: C

It is the only air breathing type that avoids decelerating the flow to subsonic speeds, which would produce temperatures no material could survive. Every other air breathing type has an upper speed limit far below the hypersonic regime.

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