List of top Physics Questions on communication systems asked in VITEEE

In amplitude modulation, the amplitude of carrier wave is $A_c$ and that of the modulating signal is $A_m$. In practice, the ratio of to $A_m$ to $A_c$ is kept less than or equal to one, to avoid
Beyond which frequency, the ionosphere bands any incident electromagnetic radiation but do not reflect it back towards the earth?
The amplification factor of a triode is 50. If the grid potential is decreased by 0.20 V, what increase in plate potential will keep the plate current unchanged?
If a radio-receiver amplifies all the signal frequencies equally well, it is said to have high
If a triode value amplification factor is 20 and plate resistance is \( 10 \, \text{k}\Omega \), then its mutual conductance is
Sky wave propagation is used in:
The frequency of an FM transmitter without signal input is:
Sky wave propagation is used in
The frequency of an $FM$ transmitter without signal input is called
An AM wave has \(1800\,W\) of total power content. For \(100%\) modulation the carrier should have power content equal to
Radio waves of certain double wavelength can pass through night waves do not. The reason is that radio waves
Sinusoidal carrier voltage of frequency \(1.5\,MHz\) and amplitude \(50\,V\) is amplitude modulated by a sinusoidal voltage of frequency \(10\,kHz\) producing \(50%\) modulation. Frequencies in lower and upper side-band are
The attenuation of a calf fibre is mainly due to
Sinusoidal carrier voltage of frequency $1.5\, MHz$ and amplitude $50\, V$ is amplitude modulated by sinusoidal voltage of frequency $10\, kHz$ producing $50 \%$ modulation. The lower and upper side-band frequencies in $kHz$ are
The attenuation in optical fibre is mainly due to
In Colpitt oscillator the feedback network consists of
A radio station has two channels. One is AM at 1020 kHz and the other is FM at 89.5 MHz. For good results you will use
Radar waves are sent towards a moving airplane and the reflected waves are received. When the airplane is moving towards the radar, the wavelength of the wave
The transmission of high frequencies in a coaxial cable is determined by
The output stage of a television transmitter is most likely to be a
The antenna current of an AM transmitter is 8A when only the carrier is sent, but it increases to 8.93A when the carrier is modulated by a single sine wave. Find the percentage modulation.
The output stage of a television transmitter is most likely to be a
An amplifier with proper negative feedback network circuits:
Which of the following gates can perform perfect binary addition?
An FM transmitter without signal input is called: