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Network TheoryThree-Phase Circuits

In the two-wattmeter method for a balanced load, one wattmeter reads zero when the power factor is?

  • A1
  • B0.866
  • C0.5
  • D0
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Correct Answer: C. 0.5
Explanation: One reading becomes zero at phi=60°, for which cos(phi)=0.5.
Reference: Standard network theory: two-wattmeter power factor
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