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Two transformers each lightly loaded should be considered for

  • A.consolidation onto one, the other being switched off
  • B.parallel operation so as to share the load equally between them
  • C.replacement by two larger units
  • D.connection in series to reduce the voltage

Answer: A

Each is paying its full iron loss for a fraction of its rating, and switching one off removes that loss entirely while the other moves closer to its efficient region. Reliability and the ability to carry the peak have to be checked before doing it.

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