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Iron loss in the armature of a dc machine consists of

  • A.stray load loss arising from flux distortion under load
  • B.hysteresis loss and eddy current loss
  • C.copper loss and brush contact loss taken together
  • D.friction loss in the bearings and windage in the air gap

Answer: B

Hysteresis follows roughly the 1.6 power of flux density and the first power of frequency, while eddy current loss follows the squares of both. Thin laminations of silicon steel reduce the second and a good grade reduces the first.

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