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Exam Questions Papers - Engineering

Q1:

The amplitude modulated wave is given by __________ e = 25(1 + 0.7 cos 5000t - 0.3 cos 1000t) x sin 5 x 106t The amplitude of carrier and sideband frequencies in magnitudes are

A 25, 0.7, 0.3

B 25, 0.7, - 0.3

C 24, 17.5, 7.5

D 25, 8.75, 3.75

ANS:D - 25, 8.75, 3.75

Modulation index is 0.7 and 0.3 so that amplitude of signal is 0.7 x 25 = 17.5 and 0.3 x 25 = 7.5 On modulation the sideband amplitude is . Hence 8.75 and 3.75