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Energy recovered during the regenerative braking of a traction drive is normally

  • A.stored in the inertia of the rotating parts until the next acceleration
  • B.converted into mechanical work by the load being braked
  • C.returned to the supply or to another train
  • D.dissipated in the machine windings as heat during the braking period

Answer: C

Metro systems recover a substantial fraction of their traction energy this way, provided another train is accelerating nearby or the substation can accept the power. Where it cannot, a resistor bank takes the surplus instead.

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