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MCQ Practice Question
Network TheoryThree-Phase Circuits

In the two-wattmeter method, if the balanced load has unity power factor, the two wattmeters ideally read?

  • AEqual positive values
  • BEqual and opposite values
  • COne zero and one positive value
  • DBoth zero
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Correct Answer: A. Equal positive values
Explanation: At unity power factor phi=0, the readings are proportional to cos(30°-phi) and cos(30°+phi), so they are equal and positive.
Reference: Standard network theory: two-wattmeter unity power factor
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