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Q.19 Power consumed by a balanced 3-phase, 3-wire load is measured by the two wattmeter method. The first wattmeter reads twice that of the second. Then the load impedance angle in radians is

1. π/12
2. π/8
3. π/6
4. π/3

Correct answer: π/6

Solution

With W1=2W2, tan(phi)=sqrt(3)(2W2-W2)/(2W2+W2)=sqrt(3)/3=1/sqrt(3), so phi=30 deg = pi/6 radians.

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