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A transformer cannot operate on a direct supply because

  • A.the laminations would suffer no eddy current loss
  • B.a steady flux induces no emf in the secondary
  • C.the core would saturate at the very first instant
  • D.the windings have no resistance to limit the current

Answer: B

Induction requires a changing flux linkage, and direct current gives a steady flux once the transient has died away. The primary then behaves as a low resistance across the supply, which is why applying dc to a transformer destroys it.

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