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Drives on successive stands of a continuous rolling mill must

  • A.run entirely independently with no coordination
  • B.run at speeds set by hand at each stand
  • C.run at speeds matched to the changing strip thickness
  • D.run at exactly the same speed as one another

Answer: C

The strip lengthens as it thins, so each stand must run faster than the one before it in a ratio set by the reduction. Tension between stands is regulated by trimming those ratios, and a loss of coordination breaks the strip.

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