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Which of the following does not extract work from the gas?

  • A.A free power turbine
  • B.The nozzle guide vanes
  • C.The high pressure turbine rotor
  • D.The low pressure turbine rotor

Answer: B

Correct answer: The nozzle guide vanes

Work is force times velocity at the surface doing it, and the vanes do not move, so they can extract nothing. Their function is to accelerate the gas and turn it into the plane of rotation. The high pressure, low pressure and free power turbine rotors all extract work, each driving a different shaft.

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