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A winder at the dry end of a paper machine is a load of

  • A.negligible torque at every reel diameter
  • B.constant power, with torque rising as the reel grows
  • C.constant torque at every reel diameter
  • D.torque proportional to the square of the speed

Answer: B

Constant surface speed and constant tension together mean the torque rises and the angular speed falls in inverse proportion, so the power is nearly constant. Field weakening or the constant-power region of a converter drive suits it exactly.

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