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Supersonic flow can only be decelerated to subsonic speed through

  • A.A gradual expansion
  • B.A constant area duct alone
  • C.Heat addition
  • D.One or more shock waves

Answer: D

A supersonic stream slows in a converging passage and accelerates in a diverging one, the reverse of subsonic behaviour, so smooth deceleration to subsonic speed is impossible. The shock provides the discontinuous transition, at the cost of a total pressure loss.

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