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A lift drive regenerates when

  • A.the car is travelling at constant speed in either direction
  • B.a full car descends or an empty car ascends
  • C.a full car ascends or an empty car descends
  • D.the car is stationary at a floor

Answer: B

Those are the cases in which the load overhauls the counterweight, so the machine restrains rather than drives it. Recovering that energy rather than dumping it in a resistor is now common in tall buildings with many lifts.

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