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Regenerative braking of a drive is possible only when

  • A.the supply connections to the machine are reversed while it is running
  • B.the load torque falls to zero at the speed the drive has reached
  • C.the machine can return power to the supply
  • D.the machine is disconnected from the supply and connected to a resistance

Answer: C

Both the machine and the converter feeding it must be able to pass power in the reverse direction, and the supply must be able to absorb it. Where it is available it is the most efficient braking method, since the energy is recovered.

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