Modulation

The diagram given below shows the block diagram of a detector for AM signals.


Label the unlabelled boxes in this block diagram indicated by (b) and (c).

A carrier wave of peak voltage $12 \mathrm{V}$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75\%$ is

Which of the following factors justify the need of modulating a signal:

Among following, the factor which justifies the need of modulating a signal is

How does the effective power radiated by an antenna (of length l) vary with wavelength?

The maximum frequency of an amplitude modulated wave is $850\mathrm{Hz}$ and its bandwidth is $50\mathrm{Hz}$. The carrier frequency of the wave is

It is desired to transmit an electronic signal in the Audio Frequency (AF) range. Which of the following statements on amplitude modulation of the signal by a carrier wave is NOT TRUE?

A modulating signal $m\left(t\right)$ has an amplitude of $10 \mathrm{V}$ and a frequency of $1 \mathrm{kHz}.$ The amplitude is modulated by a carrier signal with a frequency of $100 \mathrm{kHz}.$ If the modulation index is $0.2,$ the carrier signal $c\left(t\right)$ is given by

Find the modulation factor if maximum peak to peak voltage of an $AM$ wire is $24 \mathrm{mV}$ and the minimum peak to peak voltage is $8 \mathrm{mV}$.

What is the modulating index of an oscillator which is producing FM waves of frequency $2 \text{kHz}$ with a variation of $10 \mathrm{kHz}$?

Modem is a device used for

In an $\mathrm{AM}$ wave for audio frequency of $3400 \mathrm{cycle} {\mathrm{s}}^{-1}$, the appropriate carrier frequency will be

"Need for modulation" arises due to which of the following reasons?

The frequency of amplitude modulated wave is equal to

A device that connects one computer to another across ordinary telephone lines is called

Modulation is necessary

Which kind of modulation is almost resilient to noise.

Which of the following modes of transmission has the lowest noise immunity?

__________ type of transmission, one complete side-band of the signal and half of the remaining side-band is sent together. Enable GingerCannot connect to Ginger Check your internet connection
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Which of the following is a type of amplitude modulation?