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Low power factor adjustment involves _________

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Low power factor adjustment involves _________

(a) adjusting the power factor at lower loads

(b) applying rated voltage to pressure coil and a p.f. of 0.5 for current coil

(c) only applying rated voltage to pressure coil

(d) only a p.f. of 0.5 for the current coil

The question was posed to me during an internship interview.

My doubt stems from Electronic Energy Meter, Adjustments in Single Phase Energy meters in portion Measurement of Power and Related Parameters of Electrical Measurements

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Best answer
The correct choice is (b) applying rated voltage to pressure coil and a p.f. of 0.5 for current coil

Best explanation: Rated voltage is applied to the pressure coil. The current coil is provided with a current at 0.5 p.f. lagging. Till the disc rotates at correct speed, lag device is adjusted.

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