Short notes
Objective questions (Answers are given below)
- Non-sinusoidal waveforms are made up of
(a) different sinusoidal waveforms
(b) fundamental and even harmonics
(c) fundamental and odd harmonics
(d) even and odd harmonics only. - The positive and negative halves of a
complex wave are symmetrical when
(a) it contains even harmonics
(b) phase difference between even harmonics
and fundamental is 0 or π
(c) it contains odd harmonics
(d) phase difference between even harmonics
and fundamental is either π / 2 or 3π / 2. - The r.m.s. value of the complex voltage
given by v = 16 2 sinωt + 12 2 sin3ωt is
nbsp;nbsp;nbsp;(a) 20 2 (b) 20
nbsp;nbsp;nbsp;(c) 28 2 (d) 192
- In a 3-phase system, ___th harmonic has
negative phase sequence of RBY.
(a) 9 (b) 13
(c) 5 (d) 15 - A complex current wave is given by the
equation i = 14 sin ωt + 2sin5ωt. The r.m.s.
value of the current is _ ampere.
(a) 16 (b) 12
(c) 10 (d) 8 - When a pure inductive coil is fed by a
complex voltage wave, its current wave
(a) has larger harmonic content
(b) is more distorted
(c) is identical with voltage wave
(d) shows less distortion. - A complex voltage wave is applied across a
pure capacitor. As compared to the
fundamental voltage, the reactance offered
by the capacitor to the third harmonic
voltage would be
(a) nine time (b) three times
(b) one-third (d) one-ninth - Which of the following harmonic voltage
components in a 3-phase system would be in
phase with each other ?
(a) 3rd, 9th, 15th etc.
(b) 7th, 13th, 19th etc.
(c) 5th, 11th, 17th etc.
(d) 2nd, 4th, 6th etc.
1.(a) 2. (c) 3. (b) 4. (c) 5. (c) 6. (d) 7. (c) 8. (d)