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A distribution transformer is designed with a low iron loss because

  • A.its core flux varies widely with the load it carries
  • B.it is switched off whenever it is not carrying load
  • C.it is energised for the whole day but loaded for only part of it
  • D.its copper loss is negligible at every level of load

Answer: C

Iron loss is present the moment the transformer is connected, so on a lightly loaded feeder it dominates the day's energy loss. Power transformers, loaded nearer their rating for most of the time, are optimised differently.

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