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A universal motor's field circuit is laminated because

  • A.the commutator would otherwise spark excessively
  • B.the machine must run at very high speeds
  • C.the flux alternates when it is run on an ac supply
  • D.the armature current is larger than in a dc machine

Answer: C

A solid field circuit would suffer heavy eddy current loss under alternating flux, so the whole magnetic circuit is built of laminations unlike an ordinary dc series machine. That is the principal constructional difference between the two.

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