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The armature of a dc motor is fed from a converter while the field is fed from

  • A.no supply at all
  • B.a separate and usually simpler supply
  • C.the same converter
  • D.the mechanical shaft of the machine through a small generator

Answer: B

The field needs only a fraction of the power and rarely needs fast control, so a small single-phase bridge or a fixed supply suffices. Independent control of the two is what gives the dc drive its characteristic two regions.

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