TS EAMCET · Physics · Communication System
The modulation index used in amplitude modulation of a message signal of peak voltage \(10 \mathrm{~V}\) is 0.5 . By how much the peak voltage of the carrier signal be changed, so as to obtain the modulation index of 0.8 , keeping the peak voltage of the message signal same as before?
- A Increased by \(7.5 \mathrm{~V}\)
- B Reduced by \(7.5 \mathrm{~V}\)
- C Increased by \(12.5 \mathrm{~V}\)
- D Reduced by \(12.5 \mathrm{~V}\)
Answer & Solution
Correct Answer
(B) Reduced by \(7.5 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Initially modulation index, \(\mu=0.5\) and message amplitude, \(A_m=10 \mathrm{~V}\) As, \(\mu=\frac{A_m}{A_c} \Rightarrow A_{c_1}=\frac{A_m}{\mu}=\frac{10}{0.5}=20 \mathrm{~V}\) When \(\mu=0.8\) and \(A_m=10 \mathrm{~V}\),…
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