GATE EE 2014 Set 2 — Question 30
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Electric Circuits → AC Power & Three-Phase → Two-Wattmeter Method
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Question
While measuring power of a three-phase balanced load by the two-wattmeter method, the readings are 100 W and 250 W. The power factor of the load is _________.
Correct answer
0.78 to 0.82
Solution
In the two-wattmeter method for measuring three-phase power, the readings are W and W. The phase angle is calculated using the formula:Substituting the given values:The power factor is :This value falls within the range of 0.78 to 0.82.
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