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A ball mill drive is dominated by

  • A.a very large breakaway torque
  • B.a torque that falls with the square of the speed
  • C.the need for a very wide speed range
  • D.the need for rapid reversal of direction

Answer: A

A drum full of ore and grinding media has to be broken away from rest, and the requirement can be twice the running torque or more. Low-speed synchronous machines on cycloconverters, or geared induction drives with soft starting, are used.

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