FPSC Assistant Executive Engineer (Electrical) Test

Power factor and its improvement (MCQs taken from www.careerride.com)

1. Active power and apparent power are respectively represented by?
a. kW and kVAR
b. kVAR and kVA
c. kVA and kVAR
d. kW and kVA ✓

2. For a consumer what is the most economical power factor?

a. 0.25 – 0.5 lagging
b. 0.25 – 0.5 leading.
c. 0.85 – 0.95 lagging. ✓
d. 0.85 – 0.95 leading.

3. The primary reason for the low power factor is due to the installation of

a. Induction motors ✓
b. DC motors
c. Synchronous motors.
d. Commutator motors.

4. The most suitable location for the power factor improvement device is

a. Near the electrical appliance which is responsible for the poor power factor.
b. At the sending end.
c. At the receiving end in case of transmission lines.
d. Both (a) and (c). ✓

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

a. In series with the equipment
b. In parallel with the equipment ✓
c. In series-parallel with the equipment
d. Either (a) or (b)