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A synchronous motor driving a load at 0.8 power factor leading is

  • A.over-excited for that load
  • B.under-excited for that load
  • C.at exactly normal excitation for that load
  • D.running with no excitation at all

Answer: A

Correct answer: over-excited for that load

A leading power factor means the machine is supplying reactive power, which happens when its excitation exceeds the value giving unity power factor at that load. Under-excited it would draw a lagging current instead, and at normal excitation the power factor would be unity.

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