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In the Two wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is ___________(a) 0(b) 0.5(c) 0.866(d) 1.0This question was addressed to me during an interview.My doubt stems from Problems Involving Coupling Coefficient in division Resonance & Magnetically Coupled Circuit of Network Theory

Answer» CORRECT choice is (b) 0.5

To EXPLAIN I would say: The load power factor is = 0.5. Since at this power factor one wattmeter SHOWS zero and the other shows a POSITIVE MAXIMUM value of power.


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