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Network TheoryAC Power

A load has complex power S=3+j4 kVA. Its power factor is?

  • A0.4 lagging
  • B0.6 lagging
  • C0.8 lagging
  • D1.0
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Correct Answer: B. 0.6 lagging
Explanation: |S|=5 kVA and power factor=P/|S|=3/5=0.6. Positive Q denotes an inductive, lagging load.
Reference: Standard network theory: complex power factor numerical
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