Power Quality and Management (2180911) MCQs

MCQs of Power Factor

Showing 11 to 20 out of 29 Questions
1 2 3
11.
The power factor of ac circuit lies between
(a) 0 and 1
(b) -1 and 1
(c) 0 and -1
(d) None of the above
Answer:

Option (a)

12.
In an induction motor when the air gap field between rotor and stator increases power factor of the machine:
(a) Increases
(b) Decreases
(c) Does not have any effect
(d) None of the above
Answer:

Option (b)

13.
In an ac circuit I x sin (Φ) is called the _________ component of the current:
(a) Watless
(b) Reactive
(c) Quadrature
(d) All the above
Answer:

Option (b)

14.
The heat developed in an electric iron is attributed to _______ power
(a) Apparent
(b) Reactive
(c) True
(d) True and reactive
Answer:

Option (c)

15.
When the power factor in the transmission line is leading, which device is employed at substation to reduce the power factor:
(a) CVT
(b) Reactor
(c) Synchronous condenser
(d) None of these
Answer:

Option (b)

16.
In a circuit low reactive power compared to true power indicates
(a) Low power factor
(b) High power factor
(c) Low efficiency
(d) High efficiency
Answer:

Option (b)

17.
The power rating of given on the name plate of a transformer indicates the
(a) True power which it can supply
(b) Apparent power which it can supply
(c) Apparent power which it draws from the supply mains
(d) True power which it draws from the supply mains
Answer:

Option (b)

18.
Power factor of a pure capacitor is
(a) unity
(b) zero leading
(c) zero lagging
(d) between unity and zero lagging
Answer:

Option (b)

19.
Power factor of choke is
(a) unity
(b) zero lagging
(c) zero leading
(d) between unity and zero lagging
Answer:

Option (b)

20.
The primary reason for low power factor in the supply system is due to installation of
(a) induction motor
(b) synchronous motor
(c) d. c. motors
(d) single phase motor
Answer:

Option (a)

Showing 11 to 20 out of 29 Questions
1 2 3