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A convergent-divergent nozzle is needed when

  • A.The exhaust gas is cool
  • B.The pressure ratio is well above critical
  • C.The pressure ratio is below critical
  • D.The engine is at rest

Answer: B

Only a diverging section can accelerate an already sonic flow to supersonic speed. Below the critical ratio the divergent portion would act as a diffuser and slow the flow, which is why the geometry must suit the pressure ratio available.

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