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. 

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.

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

The r.m.s. value of the complex voltage given by v = + 16√2sinωt + 12√2 sin3ωt   is

(a) 20√2 

(b) 20 

(c) 28√2 

(d) 192

Non-sinusoidal wave forms are made up of 

(a) different sinusoidal wave forms 

(b) fundamental and even harmonics 

(c) fundamental and odd harmonics 

(d) even and odd harmonics only

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

Determine whether the following two waves are of the same shape 

e = 10sin ( ωt + 30º) – 50 sin(3ωt – 60º) + 25 sin (5ωt + 40º) 

i = 1.0 sin (ωt – 60º) + 5 sin (3ω t – 150º) + 2.5cos (5ω t – 140º)

A complex current wave is given by the equation i = 14sinωt  + 2sinωt. The r.m.s. value of the current is ___ ampere. 

(a) 16 

(b) 12 

(c) 10 

(d) 8

In a 3-phase system, ___th harmonic has negative phase sequence of RBY.

(a) 9 

(b) 13 

(c) 5 

(d) 15