Question

A modulated signal $\mathrm{C}_{\mathrm{m}}(\mathrm{t})$ has the form $\mathrm{C}_{\mathrm{m}}(\mathrm{t})=30 \sin 300 \pi \mathrm{t}+10(\cos 200 \pi \mathrm{t}-\cos 400 \pi \mathrm{t})$. The carrier frequency $\mathrm{f_c}$, the modulating frequency (message frequency) $\mathrm{f}_\omega$ and the modulation index $\mu$ are respectively given by:

Accepted Answer

$\mathrm{f}_{\mathrm{c}}=150 \mathrm{~Hz} ; \mathrm{f}_{\mathrm{w}}=50 \mathrm{~Hz} ; \mu=\frac{2}{3}$

Answer

$\mathrm{f}_{\mathrm{c}}=200 \mathrm{~Hz} ; \mathrm{f}_{\mathrm{w}}=50 \mathrm{~Hz} ; \mu=\frac{1}{2}$

Answer

$\mathrm{f}_{\mathrm{c}}=150 \mathrm{~Hz} ; \mathrm{f}_{\mathrm{w}}=30 \mathrm{~Hz} ; \mu=\frac{1}{3}$

Answer

$\mathrm{f}_{\mathrm{c}}=200 \mathrm{~Hz} ; \mathrm{f}_{\mathrm{w}}=30 \mathrm{~Hz} ; \mu=\frac{1}{2}$

NEET UG PHYSICS MCQ: COMMUNICATION SYSTEMS

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