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Q.

A carrier is modulated simultaneously by 3 sine waves of modulation indices 0.3, 0.4 and 0.45 respectively. The net modulation index is

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a

1.15

b

0.67

c

0.57

d

0.84

answer is B.

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Detailed Solution

m=m12+m22+m32=(0.3)2+(0.4)2+(0.45)2 = =0.09+0.16+0.2025 ==0.4525 = 0.67
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A carrier is modulated simultaneously by 3 sine waves of modulation indices 0.3, 0.4 and 0.45 respectively. The net modulation index is