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

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:

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