Q.

A 360 W carrier wave is simultaneously modulated by two audio waves with modulation percentages of 55 and 65 respectively. Then total side band power is

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a

90 W

b

130 W

c

60 W

d

115 W

answer is B.

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Detailed Solution

Psideband=? PCW=360W m1=55100 , m2=65100 PSB=PCW2m12+m22         =3602551002+651002           =18011202+13202          =184029 = 18×2940=130.5  W
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A 360 W carrier wave is simultaneously modulated by two audio waves with modulation percentages of 55 and 65 respectively. Then total side band power is