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The speed profile of a mine winder is shaped so that

  • A.the cage accelerates continuously to the surface
  • B.no acceleration is applied at any point in the journey
  • C.acceleration, full speed and retardation fit the shaft depth
  • D.the cage runs at full speed for the whole journey

Answer: C

The profile is designed for the depth, the payload and the comfort of the people carried, with the stopping distance verified against the headgear clearance. Automatic winders follow it under control rather than leaving it to the driver.

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