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A transformer's no-load loss is

  • A.zero when the secondary is open circuited
  • B.substantially constant whatever the load
  • C.proportional to the load current
  • D.proportional to the square of the load current

Answer: B

The core is magnetised whenever the transformer is energised, so the hysteresis and eddy current loss continues through the night and the weekend. On a lightly loaded transformer it is the dominant loss and the reason for switching one off.

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