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A reversing rolling mill drive requires

  • A.four-quadrant operation with rapid reversal
  • B.one-quadrant operation at constant speed
  • C.two-quadrant operation with no reversal at all
  • D.no speed control

Answer: A

The slab passes back and forth through the stand, so the drive must motor and brake in both directions and change over in a fraction of a second. Very large low-speed machines with cycloconverter or load commutated inverter supplies are the usual arrangement.

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