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A railway traction drive requires

  • A.high torque at starting and constant power at speed
  • B.constant torque at every speed the vehicle can reach
  • C.constant power from standstill upwards without exception
  • D.no braking capability

Answer: A

Getting a heavy train moving needs torque, and cruising needs speed at whatever torque the resistance demands, which is the two-region envelope exactly. The dc series machine's characteristic suited it naturally and the converter now provides it deliberately.

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