Power Quality and Management (2180911) MCQs

MCQs of Harmonics

Showing 11 to 20 out of 29 Questions
11.
8th harmonic is negative sequence harmonic.
(a) True
(b) False
Answer:

Option (a)

12.
12th harmonic is _________
(a) Positive sequence harmonic
(b) zero sequence harmonic
(c) subharmonics
(d) negative sequence harmonic
Answer:

Option (b)

13.
Does the magnitude of phase shift angle change the phase sequence order of the harmonic?
(a) Yes
(b) No
(c) Can't say
Answer:

Option (b)

14.
The RMS value of the third harmonic current in a nonlinear load is 20 A, the RMS value of the fifth harmonic current is 15 A, and the RMS value of the fundamental is 60 A. Then, the individual third harmonic distortion is
(a) 25 %
(b) 100 %
(c) 33.3 %
(d) 66 %
Answer:

Option (c)

15.
What is total harmonic distortion of a voltage waveform with the Fundamental harmonic frequency voltage =114 V, third harmonic frequency voltage = 4 V, fifth harmonic frequency voltage = 2 V, seventh harmonic frequency voltage = 1.5 V and ninth harmonic frequency voltage = 1 V ?
(a) 4.23 %
(b) 4.32 %
(c) 3.42 %
(d) 2.43 %
Answer:

Option (a)

16.
The __________________ indicates the contribution of each harmonic frequency to the distorted waveform, and the ___________________ describes the net deviation due to all the harmonics
(a) total harmonic distortion, individual harmonic distortion
(b) individual harmonic distortion, total harmonic distortion
Answer:

Option (b)

17.
Which harmonics are easy to eliminate from the system?
(a) Odd
(b) even
(c) lower
(d) higher
Answer:

Option (d)

18.
Determine the k rating of a transformer required to carry a load consisting of 500 A of fundamental, 200 A of third harmonics, 120 A of fifth harmonics, and 90 A of seventh harmonics
(a) 4.378
(b) 3.487
(c) 7.348
(d) 8.347
Answer:

Option (a)

19.
In theory, the neutral current can be as high as ______% of the phase currents
(a) 113
(b) 123
(c) 183
(d) 173
Answer:

Option (d)

20.
Two of the more prominent harmonics found in a typical power system are
(a) 3rd and 5th
(b) 5th and 7th
(c) 7th and 9th
(d) 3rd and 7th
Answer:

Option (b)

Showing 11 to 20 out of 29 Questions