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A dry type transformer differs from an oil-filled one in using

  • A.water circulating through the windings
  • B.no insulation between the windings at all
  • C.a vacuum within a sealed tank
  • D.air or cast resin as its insulating medium

Answer: D

Cast resin or open ventilated construction avoids the fire risk and the maintenance of oil, which suits indoor and building installations. Ratings and voltages are more limited than for an oil-filled unit of the same size.

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