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The torque a winder drive must deliver at constant tension

  • A.falls to zero once the reel is full
  • B.rises as the reel diameter grows
  • C.falls as the reel diameter grows
  • D.stays constant throughout the run

Answer: B

Torque is tension times radius, so it grows in proportion to the diameter while the speed falls in inverse proportion. The product, and therefore the power, stays roughly constant, which is why winders are classic constant-power loads.

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