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An impulse turbine stage is one in which

  • A.The whole pressure drop occurs in the rotor
  • B.The pressure drop is shared equally
  • C.There is no pressure drop at all
  • D.The whole pressure drop occurs in the nozzle guide vanes

Answer: D

With no pressure change across the rotor, the relative velocity is unchanged in magnitude and the blades merely turn the flow. Zero degree of reaction gives the highest work per stage but at noticeably lower efficiency than a reaction design.

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