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All-day or energy efficiency of a distribution transformer is the ratio of

  • A.iron loss to copper loss over a day of operation
  • B.output energy to input energy over twenty-four hours
  • C.output power to input power at rated load
  • D.rated output to the largest output it can briefly deliver

Answer: B

Because a distribution transformer is energised continuously but loaded for only part of the day, its iron loss runs for twenty-four hours while its copper loss runs for a few. Designing for a low iron loss is what raises the figure.

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