Question:
In the measurement of power consumed by a three-phase balanced inductive load using two-wattmeter method, one of the wattmeters \( W_2 \) shows zero reading. The load power factor is
In the measurement of power consumed by a three-phase balanced inductive load using two-wattmeter method, one of the wattmeters \( W_2 \) shows zero reading. The load power factor is
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If one of the wattmeters in the two-wattmeter method shows zero reading, the power factor is unity, indicating a purely resistive load.
Updated On: Feb 3, 2026
- zero lagging
- unity
- 0.5 leading
- 0.5 lagging
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The Correct Option is B
Solution and Explanation
Step 1: Analyze the condition of two-wattmeter method.
In the two-wattmeter method for a balanced three-phase load, if one wattmeter reads zero, the power factor is unity. This happens when the load is purely resistive.
Step 2: Conclusion.
Thus, when one wattmeter reads zero, the power factor is unity, corresponding to option (B).
In the two-wattmeter method for a balanced three-phase load, if one wattmeter reads zero, the power factor is unity. This happens when the load is purely resistive.
Step 2: Conclusion.
Thus, when one wattmeter reads zero, the power factor is unity, corresponding to option (B).
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