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A ball mill drive is a load whose torque is

  • A.high and nearly constant, with a very high breakaway value
  • B.proportional to the square of the speed of rotation
  • C.inversely proportional to the speed of rotation
  • D.negligible at every speed within its range

Answer: A

A drum full of ore and grinding media has an enormous breakaway requirement and then a steady one, which is why such drives are rated on the start rather than the run. Low-speed synchronous machines on cycloconverters are the usual arrangement.

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