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Laminating the armature core of a dc machine reduces

  • A.copper loss in the armature winding
  • B.friction and windage loss at the bearings
  • C.eddy current loss
  • D.hysteresis loss in the iron of the core

Answer: C

Thin sheets separated by insulation break up the paths available to circulating currents, and the loss falls with the square of the thickness. Hysteresis loss depends on the grade of steel rather than on how it is divided.

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