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Modern railway traction uses

  • A.no electrical machine at all
  • B.inverter-fed induction or permanent magnet machines
  • C.dc series machines with resistance control in graded steps
  • D.synchronous machines connected directly to the overhead line

Answer: B

Cage or magnet machines with no commutator withstand the environment and need almost no maintenance, and the converter gives whatever characteristic is wanted. Resistance-controlled dc traction survives only on older stock.

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