Electrical load & Power factor correction

The power factor of purely resistive circuit is:

• leading

• lagging

• unity

• any of the above

The power factor of an inductive circuit has:

• leading

• lagging

• unity

• Any of the above

The power factor of a capacitive load is:

• leading

• lagging

• unity

• any of the above

Practical loads are usually:

• Resistive

• Capacitive

• Inductive

• Resistive + Inductive

Usually, the engineers achieve PF correction using:

• Capacitors

• Inductors

• Resistors

• All of above

Low power factor is usually not due to

• Discharge lamps

• Incandescent lamps

• Arc lamps

• Induction furnaces

Power factor can be improved by using

• static capacitor

• synchronous condenser

• capacitor bank

• all of the above

In a circuit low reactive power compared to true power indicates

• Low power factor

• high power factor

• low efficiency

• high efficiency

In order to improve the power factor of equipment operating at lagging power factor, a capacitor is connected

• In series with the equipment

• In parallel with the equipment

• In series-parallel with the equipment

• Either (a) or (b)

If power factor is less than unity then it will result in

• Large kVA rating of equipment

• Greater conductor size

• Large copper losses

• All of these