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Armature reaction at unity power factor is

  • A.wholly demagnetising, reducing the main field flux directly
  • B.wholly magnetising, adding to the main field flux directly
  • C.absent entirely, no armature current flowing at all
  • D.cross-magnetising, distorting rather than opposing the field

Answer: D

The armature field sits across the main one and shifts the resultant without much changing its magnitude, though saturation makes the net effect slightly demagnetising. Lagging and leading loads add the axial components to that.

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