The maximum number of $TV$ signals that can be transmitted along a coaxial cable is

The process of superimposing a signal frequency (i.e.,audio wave) on a carrier wave is known as:

The amplitude of the upper and lower sidebands of an $A.M.$ wave,where a carrier signal with frequency $11.21 \, MHz$ and peak voltage $15 \, V$ is amplitude modulated by a $7.7 \, kHz$ sine wave of $5 \, V$ amplitude,are $\frac{a}{10} \, V$ and $\frac{b}{10} \, V$ respectively. Then the value of $\frac{a}{b}$ is $....$

Which of the following modulated signals has the best noise tolerance?

By what percentage will the transmission range of a $TV$ tower be affected when the height of the tower is increased by $21 \%$ (in $\%$)?

Which types of communication modes are used for the propagation of radio waves from one place to another?