List of top Physics Questions on communication systems asked in AP EAPCET

If the wavelength of the signal to be transmitted by an antenna is increased by \(2\) times, then the effective power radiated by the antenna
A TV transmitting antenna is 81 m tall. Service area covered, if the receiving antenna is at the ground level, will be about:
A TV tower has a height of 100m. To double the coverage distance of the tower, the height of the tower must be increased by:
If in an amplitude modulated wave, the maximum amplitude is 14 V and the modulation index is 0.4, then the amplitude of the carrier wave is
If the ratio of the maximum and minimum amplitudes of an amplitude modulated wave is 7:3, then the modulation index is
If the maximum amplitude of a modulated wave is three times its minimum amplitude, then the modulation index of the wave is
The heights of the transmitting and receiving antennas are respectively $\frac{1}{2000}$ and $\frac{1}{5000}$ times the radius of the Earth. The maximum distance between these two antennas for satisfactory communication in line of sight is}
(Radius of the Earth = 6.4 $\times 10^6$ m)
The minimum length of an antenna to transmit a signal of frequency \( 3 \text{ kHz} \) is
A message signal of frequency \(20~\text{kHz}\) and peak voltage \(20~\text{V}\) is used to modulate a carrier of peak voltage \(100~\text{V}\). The modulation index is
An oscillator is an amplifier with
The process of retrieval of information from the carrier wave
In a signal transmission, if the amplitude of the carrier wave is 10 V and the modulation index is 0.6, then the amplitude of the side bands is:
A message signal of frequency \(8\ \text{kHz}\) and peak voltage \(12\ \text{V}\) is used to modulate a carrier of frequency \(1.2\ \text{MHz}\) and peak voltage \(20\ \text{V}\). The modulation index is
The frequency suitable for beyond the horizon communication using sky wave is
The frequency band for downlink satellite communication is in the range:
A TV transmitting antenna is 70 m tall. If the receiving antenna is at ground level, then the area it can cover is: (Radius of Earth = 6400 km)
A radio antenna receiver works at \((10.5 \pm 4.5)\,MHz\) with an effective bandwidth of \(9\,MHz\). The corresponding wavelength bandwidth is:
For an amplitude modulated (AM) wave, the minimum amplitude is 4.0 V and the modulation index is 0.4. The maximum amplitude is:
A carrier wave of peak voltage \(60\,\text{V}\) is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modulation index of \(90\%\) is
Frequencies in the UHF range normally propagate by means of:
The frequency suitable beyond the horizon communication using sky wave is:
The maximum number of TV signals that can be transmitted along a co-axial cable is:
Carrier wave and modulating wave voltages increase by 1% and 3%. Find change in modulation index.
The average number of photons emitted per second by a laser of power \(6.6 \times 10^{-3}\) W producing a light of wavelength 600 nm is (Planck’s constant, \(h = 6.6 \times 10^{-34}\) J·s)