Power System - I (3140914) MCQs

MCQs of Power Factor and Power Factor Improvement of Load

Showing 1 to 10 out of 20 Questions
1 2
1.
Improving power factor
(a) Reduces current for given output
(b) Increases loss in line
(c) Increases the cost of equipment
(d) All of above
Answer:

Option (a)

2.
Installation of capacitors at suitable locations and of optimum size in a distribution system results in
1. improved voltage regulation
2. reduction in distribution power losses
3. reduction of kVA rating of distribution transformers
Select the correct answer from the codes given below
(a) 1
(b) 1 and 2
(c) 1, 2 and 3
(d) 3 alone
Answer:

Option (c)

3.
Low power factor is usually not due to
(a) Discharge lamps
(b) Incandescent lamps
(c) Arc lamps
(d) Induction furnaces
Answer:

Option (b)

4.
The primary reason for low power factor is owing to installation of
(a) Synchronous motor
(b) DC motor
(c) Induction motor
(d) Commutator motor
Answer:

Option (c)

5.
Medium size induction motor will operate at maximum power factor while operating at
(a) Full load
(b) 50% of full load
(c) 25% of full load
(d) Any load
Answer:

Option (a)

6.
Low power factor has a drawback of
(a) Increased transmission and distribution losses
(b) Poor voltage regulation
(c) High cost of equipment for given load
(d) All of above
Answer:

Option (d)

7.
The low power factor of an industrial plant is uneconomical for
(a) Electric supply utility only
(b) Owner of the plant only
(c) Both (a) and (b)
(d) Neither (a) or (b)
Answer:

Option (c)

8.
For a consumer the most economical power factor is usually
(a) 0.25 to 0.5 lagging
(b) 0.25 to 0.5 leading
(c) 0.85 to 0.95 lagging
(d) 0.85 to 0.95 leading
Answer:

Option (c)

9.
Power factor can be improved by using
(a) Static capacitors
(b) Synchronous condenser
(c) Phase advancer
(d) All of above
Answer:

Option (d)

10.
Static capacitors are rated in terms of
(a) KVAR
(b) kW
(c) kVA
(d) kWh
Answer:

Option (a)

Showing 1 to 10 out of 20 Questions
1 2