NCERT Solutions for Chapter: Communication Systems, Exercise 2: VSA

Would sky waves be suitable for transmission of TV signals of $60 \mathrm{MHz}$ frequency?

Two waves $\mathrm{A}$ and $\mathrm{B}$ of frequencies $2 \mathrm{MHz}$ and $3 \mathrm{MHz}$, respectively are beamed in the same direction for communication via sky wave.Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?

The maximum amplitude of an $\mathrm{A}.\mathrm{M}.$ wave is found to be $15 \mathrm{V}$ while its minimum amplitude is found to be $3 \mathrm{V}$. What is the modulation index?

Compute the $\mathrm{LC}$ product of a tuned amplifier circuit required to generate a carrier wave of $1 \mathrm{MHz}$ for amplitude modulation.

Why is a $\mathrm{AM}$ signal likely to be more noisy than a $\mathrm{FM}$ signal upon transmission through a channel?

Figure shows a communication system. What is the output power when input signal is of $1.01\mathrm{mW}$? 

A TV transmission tower antenna is at a height of $20 \mathrm{m}$. How much service area can it cover if the receiving antenna is $\left(\mathrm{i}\right)$ at ground level, $\left(\mathrm{ii}\right)$ at a height of $25 \mathrm{m}$? Calculate the percentage increase in area covered in case $\left(\mathrm{ii}\right)$ relative to case $\left(\mathrm{i}\right)$.

If the whole earth is to be connected by $\mathrm{LOS}$ communication using space waves (no restriction of antenna size or tower height), what is the minimum number of antennas required? Calculate the tower height of these antennas in terms of the earth's radius?