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The nozzle guide vanes of the first turbine stage usually run choked, which means

  • A.The gas stops flowing
  • B.The pressure ratio is unity
  • C.The flow reaches sonic conditions in the throat
  • D.The vanes are blocked with deposits

Answer: C

Once choked, the corrected mass flow through the turbine is fixed by the throat area regardless of what happens downstream. That fixed capacity is what makes the first vane row the effective flow control of the whole engine.

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