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A rocket-like convergent-divergent nozzle is fitted to an engine whose pressure ratio at low power falls below the critical value.

What happens in the divergent section at that condition?

  • A.It chokes the throat prematurely
  • B.It has no effect at all
  • C.It acts as a diffuser and slows the flow
  • D.It accelerates the flow to supersonic speed

Answer: C

A diverging passage accelerates supersonic flow but decelerates subsonic flow, and below the critical ratio the flow never reaches sonic conditions. The geometry must therefore suit the pressure ratio, which is why variable nozzles exist.

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