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An autotransformer differs from a two-winding transformer in that

  • A.it cannot change the voltage between its circuits
  • B.it requires no insulation on either of its windings
  • C.part of its winding is common to both circuits
  • D.it has no magnetic core linking its windings

Answer: C

Only part of the power is transformed magnetically and the rest is conducted directly through the common winding, which saves copper and reduces the losses. The two circuits are no longer electrically isolated, which is its chief drawback.

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