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Question

A carrier is simultaneously modulated by two sine waves with modulation indices of 0.4 and 0.3. The resultant modulation index will be

A

1

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B

0.7

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C

0.5

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D

0.35

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Solution

The correct option is C 0.5
m = $\sqrt{{m_{1}}^{2} + {m_{2}}^{2}} = \sqrt{(0.16) + (0.09)}$ = 0.5

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