D. C. Pandey Solutions for Chapter: Basics of Communications, Exercise 22: Objective Problems [Level 1]

The TV transmission tower in Delhi has a height of $240 \mathrm{m}$. The distance up to which the broadcast can be received (taking the radius of the earth to be $6.4\times {10}^6 \mathrm{m}$) is

In an amplitude modulated wave for audio frequency of $500 \mathrm{cycle} {\mathrm{s}}^{-1}$, the appropriate carrier frequency will be?

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

The characteristic impedance of a coaxial cable is of the order of

If ${\mu }_1$ and ${\mu }_2$ are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimised by having

The maximum distance upto which TV transmission from a TV tower of height $h$ can be received is proportional to

What type of modulation is employed in India for radio transmission?

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is