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:

- PF = P/S
- PF = S/P
- PF = P + S
- PF = P – S

Correct answer: 1

**Power factor is a ratio of real power to apparent power**

2. The power factor of an inductive circuit has:

- Leading
- Lagging
- Unity
- Any of above

Correct answer: 2

**A purely inductive circuit has Lagging power factor**

3. The power factor of purely resistive circuit is:

- Leading
- Lagging
- Unity
- Any of above

Correct answer: 3

**The power factor of a purely resistive circuit is unity**

4. The power factor of a capacitive load is:

- Leading
- Lagging
- Unity
- Any of above

Correct answer: 1

**A purely capacitive load has leading power factor**

5. A load having poor power factor draws current:

- Negligible
- Not negligible but small
- Normal
- High

Correct answer: 4

6. Practical loads are usually:

- Resistive
- Capacitive
- Inductive
- Resistive + Inductive

Correct answer: 4. Resistive + Inductive

7. Usually, the engineers achieve PF correction using:

- Capacitors
- Inductors
- Resistors
- All of above

Correct answer: 1. Capacitors

8. Power factor can be numerically measured as:

- A number
- Percentage
- Both of these
- None of these

Correct answer: 3. Both of these

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

- Power factor is unity
- Power factor is only 1%
- Power factor is too poor
- None of above

Correct answer: 1

10. In purely resistive circuit:

- Current and Power are in phase
- Current and Power are out of phase
- Current leads by 30 degree
- Current lags by 55 degress

Correct answer: 1.