Top 10 MCQs on Power Factor

The power factor is a ratio of real power and apparent power. Given below are top 10 MCQs on Power Factor.

1. Power factor can be mathematically expressed as:

1. PF = P/S
2. PF = S/P
3. PF = P + S
4. PF = P – S

Correct answer: 1

Power factor is a ratio of real power to apparent power

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2. The power factor of an inductive circuit has:

1. Leading
2. Lagging
3. Unity
4. Any of above

Correct answer: 2

A purely inductive circuit has Lagging power factor

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3. The power factor of purely resistive circuit is:

1. Leading
2. Lagging
3. Unity
4. Any of above

Correct answer: 3

The power factor of a purely resistive circuit is unity

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4. The power factor of a capacitive load is:

1. Leading
2. Lagging
3. Unity
4. Any of above

Correct answer: 1

A purely capacitive load has leading power factor

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5. A load having poor power factor draws current:

1. Negligible
2. Not negligible but small
3. Normal
4. High

Correct answer: 4

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6. Practical loads are usually:

1. Resistive
2. Capacitive
3. Inductive
4. Resistive + Inductive

Correct answer: 4. Resistive + Inductive

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7. Usually, the engineers achieve PF correction using:

1. Capacitors
2. Inductors
3. Resistors
4. All of above

Correct answer: 1. Capacitors

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8. Power factor can be numerically measured as:

1. A number
2. Percentage
3. Both of these
4. None of these

Correct answer: 3. Both of these

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9. If power factor is expressed as a number, the digit 1 indicates:

1. Power factor is unity
2. Power factor is only 1%
3. Power factor is too poor
4. None of above

Correct answer: 1

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10. In purely resistive circuit:

1. Current and Power are in phase
2. Current and Power are out of phase
3. Current leads by 30 degree
4. Current lags by 55 degress

Correct answer: 1.