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At normal excitation a synchronous motor operates at

  • A.a leading power factor whatever the load may be
  • B.a lagging power factor whatever the load may be
  • C.zero power factor, drawing no real power at all
  • D.unity power factor for the load in question

Answer: D

Normal excitation is defined as the field current giving unity power factor at that particular load, so it is not a fixed value but changes as the load does. More excitation than that gives a leading power factor and less gives a lagging one.

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