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A conveyor carrying material up an incline presents

  • A.a purely passive load from friction alone
  • B.a load whose torque falls with the square of the speed
  • C.no load at all once the belt is moving
  • D.an active load component from gravity

Answer: D

Correct answer: an active load component from gravity

Gravity acts on the material whether or not the belt is moving, and it acts in one direction only - downhill. That makes it an active load, capable of driving the belt as well as opposing it, which is why an inclined conveyor needs a holdback and why a downhill one needs regenerative capability.

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