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Q#1
Electro-mechanical Instruments
GATE EE 2023
MCQ
+2 marks
-0.66 marks
A 3-phase, star-connected, balanced load is supplied from a 3-phase, 
(rms), balanced voltage source with phase sequence R-Y-B, as shown in the figure. If the wattmeter reading is 
and the line current is 
(rms), then the power factor of the load per phase is
Unity
0.5 leading
0.866 leading
0.707 lagging
Explanation:
Wattmeter is connected such that current coil lies in one phase & potential coil is connected across other 2 phases.
Reading of wattmeter = VLIL sinφ
-400 = 400 × 2 × sinφ
φ = -30°
Since φ < 0, pf is leading
pf = cos 30° = 0.866 leading
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