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An over-excited synchronous motor operates at

  • A.a leading power factor
  • B.a lagging power factor
  • C.unity power factor
  • D.a power factor that depends on the load rather than the excitation

Answer: A

With more excitation than the load requires, the machine supplies reactive power to the network and its current leads the voltage. That capability is what lets a synchronous machine correct the power factor of a whole installation.

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