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Electrical Engineering Objective Questions { Harmonics }



1. Non-sinusoidal waveforms are made of
A. different sinusoidal waveforms
B. fundamental and even harmonics
C. fundamental and odd harmonics
D. even and odd harmonics only

2. The positive and negative halves of a complex wave are symmetrical when
A. it contains even harmonics
B. phase difference between even harmonics and fundamentals is 0 or it
C. it contains odd harmonics
D. phase difference between even harmonics and fundamental is either n/2 or 3n/2

3. The rms value of the complex voltage given by v = 161i sin cot + 12 Ari sin Rot is
A. 20 Ari
B.20
C.28
D.192

4. In a 3-phase system,the harmonic has negative phase sequence of RBY.
A.9
B.13
C.5
D.15

5. Two complex waves will have the same wave-shape if
A. they contain the same harmonics
B. ratio of corresponding harmonics to their respective fundamentals is the same
C. harmonics are similarly spaced with respect to their fundamental
D. they have all of the above

6. The trigonometric Fourier series for a complex wave will contain positive cosine terms only when
A. it contains even harmonics
B. its two half-cycles are symmetrical
C. its value is zero at 0= n/2, 3n/2 etc.
D. its value is zero at 0= n, 2n etc.

7. Tansient disturbance is produced in a circuit whenever
A. it is suddenly connected or discon nected from the supply
B. it is shorted
C. its applied voltage is changed suddenly
D. all of the above

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