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A convergent nozzle becomes choked when

  • A.The exit pressure equals ambient
  • B.The exit velocity falls to zero
  • C.The engine reaches maximum speed
  • D.The pressure ratio across it reaches the critical value

Answer: D

Beyond the critical pressure ratio the throat is sonic and the mass flow will not increase whatever happens downstream. Additional pressure ratio then appears as a pressure difference at the exit rather than as further acceleration.

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