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The inlet of a scramjet must

  • A.Compress the flow while leaving it supersonic
  • B.Decelerate the flow to subsonic speed
  • C.Accelerate the flow further
  • D.Remove all shock waves

Answer: A

Partial compression through oblique shocks raises the pressure without the temperature penalty of full deceleration. Getting that shock system right across a range of Mach numbers is one of the principal design challenges of the engine.

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