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The power in a 3 phase circuit is measured with the help of 2 watt meters. The reading of one of watt meters is positive and that of the others is negative. The magnitude of readings is different. It can be concluded that the power factor of the circuit is
  • a)
    Unity
  • b)
    2 (lagging)
  • c)
    0.5 (lagging)
  • d)
    Less than 0.5 (lagging)
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The power in a 3 phase circuit is measured with the help of 2 watt met...
We know that, power factor is given by
Given that,
W1 = +ve value
W2 = -ve value
Here power factor angle varies from 60 degrees to 90 degrees.
Hence power factor varies from zero to 0.5 lagging
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Most Upvoted Answer
The power in a 3 phase circuit is measured with the help of 2 watt met...
Explanation:
When measuring power in a 3 phase circuit, two watt meters are required to measure the power. The watt meters are connected in the circuit as shown below.

The power factor of the circuit can be determined based on the readings of the two watt meters. If the reading of one watt meter is positive and the reading of the other watt meter is negative, then the power factor of the circuit is lagging. The magnitude of the readings of the two watt meters will be different.

In this scenario, the power factor of the circuit is less than 0.5 (lagging). This is because the reading of one watt meter is positive and the reading of the other watt meter is negative, indicating a phase angle between the voltage and current. The magnitude of the readings of the two watt meters is different, which further confirms that the power factor is less than 0.5.

Therefore, the correct answer is option D, less than 0.5 (lagging).
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The power in a 3 phase circuit is measured with the help of 2 watt meters. The reading of one of watt meters is positive and that of the others is negative. The magnitude of readings is different. It can be concluded that the power factor of the circuit isa)Unityb)2 (lagging)c)0.5 (lagging)d)Less than 0.5 (lagging)Correct answer is option 'D'. Can you explain this answer?
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