NEET Physics Communication System MCQs

A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a distance of 200 km. Considering the surface wave propagation, what is the approximate height of the transmitting antenna required for efficient communication if the earth's radius is 6400 km?

A signal with bandwidth 20 kHz is being transmitted using amplitude modulation. To prevent overlapping of sidebands and allow for efficient filtering at the receiver, what is the minimum required carrier frequency?

In a frequency modulated wave, the instantaneous frequency varies between 100.01 MHz and 99.99 MHz. If the audio signal frequency is 1 kHz, what is the frequency deviation?

A satellite communication link operates at a frequency of 6 GHz. The transmitting and receiving antennas have gains of 40 dB and 30 dB, respectively. The distance between the satellite and the receiver is 40,000 km. If the transmitter power is 1 kW, calculate the received power, assuming free space propagation. (Take the speed of light as $3 imes 10^8$ m/s)

Which of the following is NOT a characteristic of a geostationary satellite?

A message signal of frequency 10 kHz and peak voltage 10 V is used to modulate a carrier wave of frequency 1 MHz and peak voltage 20 V. If the modulation index is 0.5, what is the peak voltage of the upper sideband?

Which of the following is NOT a basic element of a communication system?

The process of converting a message signal into a form suitable for transmission is called:

In amplitude modulation, the message signal is encoded in the ______ of the carrier wave.

The process of retrieving the message signal from the modulated carrier wave is known as: