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A load whose torque is independent of speed is exemplified by

  • A.a coiler winding strip at constant tension and constant linear speed
  • B.a paddle stirring a viscous liquid in an open tank at varying speed
  • C.a hoist lifting a fixed weight
  • D.a centrifugal fan delivering air against a fixed duct system at varying speed

Answer: C

Correct answer: a hoist lifting a fixed weight

The torque a hoist drum must supply is the weight times the drum radius, and neither changes with how fast the drum turns, so the load is constant-torque. A fan is a square-law load, a coiler at constant tension and linear speed is a constant-power load, and a stirrer in a viscous liquid is a viscous load with torque proportional to speed. Conveyors and positive displacement pumps join the hoist in the constant-torque class.

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