Q.

A carrier wave of peak voltage 12V is used to transmit a message signal. The peak voltage of modulating signal in order to have a modulation index as 0.75 is :

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a

12V

b

9V

c

6V

d

3V

answer is B.

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Detailed Solution

GivenPeak voltage of carrier wave Ec=12 VPeak voltage of modulating signal  Em=?Modulation index Ma=0.75We know modulation index  Ma=EmEc⇒Em=MaEm⇒Em=0.75×12⇒Em=9V
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