Official PYQ · 2006Set 1 · Q81Analog CommunicationsMCQ1 mark

GATE EC 2006 Set 1 Q81 — Analog Communications

Statement for Linked Answer Questions 80 and 81
Consider the following Amplitude Modulated (AM) signal, where $f_{m}<\mathrm{B}$
$x_{\mathrm{AM}}(t)=10\left(1+0.5 \sin 2 \pi f_{m} t\right) \cos 2 \pi f_{c} t$

The $\text{AM}$ signal gets added to a noise with Power Spectral Density $S_{n}(f)$ given in the figure below. The ratio of average side-band power to mean noise power would be

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Answer: B

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Published 10 Oct 2026

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