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A nozzle is said to be choked when

  • A.The flow has separated from the diverging section
  • B.A shock wave stands at the nozzle exit
  • C.The exit pressure equals the ambient pressure
  • D.The throat has reached Mach one and the mass flow can rise no further

Answer: D

Choking occurs when the throat reaches sonic conditions. Below the throat no signal can travel upstream, so lowering the back pressure changes nothing upstream of it and the mass flow is fixed by the stagnation conditions and the throat area alone. Raising the stagnation pressure is then the only way to pass more mass.

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