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Two wattmeter method is employed to measure power in a 3-phawe balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will be
1. Zero lagging
2. Zero leading
3. 0.5 lagging
4. 0.5 leading

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Correct Answer - Option 3 : 0.5 lagging

Two wattmeter method is employed to measure power in a 3-phawe balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero. I.e. one of the wattmeter reading is zero. Hence power factor will be 0.5 lagging.

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