21. According to the Fourier series, a periodic sine wave has (select one): (a)

Question

21. According to the Fourier series, a periodic sine wave has (select one): (a) The fundamental frequency only (b) Even Harmonic waveforms (c) Odd Harmonic Waveforms d) All of the above 22. Consider the previous problem again. What is the bandwidth associated with it? Answer 23. According to the Fourier series, a 10 kHz periodic square wave has an infinite number of harmonically related sinusoidal waveforms as follows (select one): (a) 1kHz, 10kHz, 20kHz, 30kHz, 40kHz, 50kHz, (b) kHz, 10kHz, 30kHz, 50 kHz, (c) 10kHz, 30kHz, 50 kHz, 70 kHz, (d) 10kHz, 20kHz, 40kHz, 60kHz,

Explanation / Answer

21) As sine wave exhibits odd symmetry, it has only odd harmonics. (c)

22) sine wave means single frequency. i.e, sin wot has the information only at wo rad/s or at fo  Hz. Therefore, its bandwith is very narrow almost zero ideally.

23)As said in 21, sine wave has odd harmonics viz; f, 3f, 5f, 7f, _ _ _ _ _

f= 10KHz ----> 10KHz, 30KHz, 50KHz, 70KHz_ _ _ _ (c)

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