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Which of these loads has the least need for accurate speed control?

  • A.A machine tool spindle cutting a thread
  • B.A passenger lift approaching a floor
  • C.A ventilation fan
  • D.A paper machine drying section

Answer: C

Nobody notices a few per cent of speed error in a fan, whereas the other three would produce a torn web, a spoiled thread or an uncomfortable stop. Matching the accuracy specified to the accuracy needed is where a good deal of money is saved or wasted.

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