Power Factor Correction MCQs

Practice Power Factor Correction MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Network TheoryPower Factor Correction

A 1 kW load operates at 0.8 lagging power factor. The reactive power is approximately 0.75 kVAR. To correct the power factor ideally to unity, the shunt capacitor bank should supply approximately?

A0.25 kVAR leading
B0.5 kVAR leading
C0.75 kVAR leading
D1.25 kVAR leading

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Correct Answer: C. 0.75 kVAR leading

Explanation: Unity power factor requires cancellation of the load's lagging reactive power, so the capacitor should provide about 0.75 kVAR leading.

Reference: Standard network theory: reactive compensation

Question 2

Network TheoryPower Factor Correction

Improving a lagging load power factor by connecting a shunt capacitor primarily reduces the source?

AReactive current component
BReal power demanded by the load to zero
CSupply frequency
DLoad resistance to zero

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Correct Answer: A. Reactive current component

Explanation: The capacitor supplies leading reactive current locally, reducing the lagging reactive current drawn from the source while the load real-power requirement is essentially unchanged.

Reference: Standard network theory: power factor correction