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A lift drive must give

  • A.the largest possible acceleration to minimise journey time
  • B.a single fixed speed with no acceleration control
  • C.no braking
  • D.accurate stopping with comfortable acceleration

Answer: D

Correct answer: accurate stopping with comfortable acceleration

Two requirements govern a lift and neither is speed. The car must stop level with the floor, or the doors cannot open safely, and the acceleration and jerk must stay within what passengers tolerate. Maximum acceleration would be neither comfortable nor, given the stopping accuracy required, faster overall.

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