SSC JE Electrical Engineering 2012 Paper

Question : 162 of 200

Marks: +1, -0

In the measurement of power in a balanced 3-phase circuit by two-wattmeter method if the two wattmeters show equal readings then the power factor of the circuit is

Zero
Unity
0.8 Lagging
0.8 Leading

Validate

Solution:

ϕ=\tan^{-1}({√3(W_1-W_2)}/(W_1+W_2))

W_1=W_2

ϕ=\tan^{-1}0=0°

Power factor cos 0º = 1

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