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A convergent-divergent nozzle is said to be choked when:

A convergent-divergent nozzle is said to be choked when: Correct Answer Mass flow rate though the nozzle reaches a maximum value

Explanation:

  • When a flowing fluid at a given pressure and temperature passes through a restriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid velocity increases. 
  • Mass flow continues to increase with decreasing the exit pressure.
  • Choked flow is a limiting condition where the mass flow will not increase with a further decrease in the downstream pressure environment.
  • A nozzle is said to be chocked when flow rate through it is maximum and at throat of nozzle M = 1

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