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The load on a roughing mill stand as the slab enters is

  • A.constant throughout the pass at rated torque
  • B.a sudden impact demanding large torque
  • C.a gradually rising demand over several seconds
  • D.negligible until the slab has fully entered the rolls

Answer: B

The bite is effectively an impact, and the drive's speed dips sharply until the control recovers it. Overload capability of two or three times rated torque, and a fast current loop, are what make the recovery acceptable.

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