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A mine winder drive must operate

  • A.with no braking system of any kind
  • B.in all four quadrants with high reliability
  • C.in one quadrant only, hoisting the load upwards
  • D.at a single fixed speed for the whole journey

Answer: B

Hoisting and lowering, loaded and empty, cover the whole plane, and a fault in a system carrying people is unacceptable. Redundant brakes, overwind protection and rigorous periodic testing are all statutory rather than optional.

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