EASY
Earn 100
A TV transmission antenna is tall. How much service area it can cover if the receiving antenna is at the ground level?
(radius of the Earth )
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Important Questions on Semiconductor Devices and Communication Systems
MEDIUM
In a communication system operating at wavelength only one percent of source frequency is available as signal bandwidth. The number of channels accommodated for transmitting signals of band width are (Take velocity of light )
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High frequency waves follow:
MEDIUM
Explain ground wave propagation.
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A TV transmission tower has a height of and the height of the receiving antenna is What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: radius of earth
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The waves suitable for transmission of radio signals are
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To double the covering range of a TV transmitting tower, its height should be multiplied by:
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Establish a relation between maximum distance of broadcast and height of antenna in space wave propagation.
MEDIUM
The maximum line-of-sight distance undefined
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Which type of communication is employed in mobile phones?
MEDIUM
Choose the incorrect statement(s):
(i) Skywave communication takes place at frequency above approximately .
(ii) Amplitude modulated (AM) radio communication is mostly done by ground wave propagation.
(iii) layer of ionosphere is mostly responsible for skywave propagation.
(iv) Bandwidth required for transmission of video signal is generally more than audio signal.
EASY
Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:
MEDIUM
A transmitting antenna at the top of a tower has a height and the height of the receiving antenna is . What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?
MEDIUM
In a line of sight radio communication, a distance of about is kept between the transmitting and receiving antennas. If the height of the receiving antenna is then the minimum height of the transmitting antenna should be: (Radius of the Earth )
MEDIUM
Which mode of propagation uses ionosphere to reflect the transmitted signals from the Earth ? State other two modes of propagation.
EASY
The physical sizes of the transmitter and receiver antenna in a communication system are:
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The frequency suitable for beyond-the-horizon communication using sky waves is
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For television broadcasting the frequency employed is normally in range,
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Which of the following frequencies will be suitable for beyond the horizon communication using sky waves?
MEDIUM
A plane electromagnetic wave is propagating along the direction with its polarization along the direction The correct form of the magnetic field of the wave would be (here is an appropriate constant):
EASY
A plane electromagnetic wave of wavelength has an intensity . It is propagating along the positive direction. The allowed expressions for the electric and magnetic fields are given by:
