SSC JE Electrical Engineering 22 Jan 2018 Evening Paper

Question : 138 of 200

Marks: +1, -0

The reading of wattmeter and ammeter is 1 kW and 10 A respectively in the three phase circuit given below. What is the value of power factor of the circuit, if the circuit is balanced?

0.5
0.65
0.74
0.86

Validate

Solution:

If circuit is balanced, then

P=V_L×I_L\cosϕ

∴\cosϕ=P/{V_L×I_L}

={1.732×1000}/{200×10}

= 0.866

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