AP EAMCET · PHYSICS · Communication System
A carrier wave of peak voltage \(60 \mathrm{~V}\) is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modulation index of \(90 \%\) is
- A \(30 \mathrm{~V}\)
- B \(54 \mathrm{~V}\)
- C \(45 \mathrm{~V}\)
- D \(60 \mathrm{~V}\)
Answer & Solution
Correct Answer
(B) \(54 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Modulation index, \(\mu=\frac{\text { Amplitude of message } A_M}{\text { Amplitude of carrier } A_C}\) here, \(\quad \mu=90 \%=\frac{9}{10}\) and \(A_C=60 \mathrm{~V}\) \(\therefore \quad \frac{9}{10}=\frac{A_M}{60}\)…
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