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Attenuation causes loss in signal strength.

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Important Questions on Communication System

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Physics>Electronics>Communication System>Elements of a Communication System
The height of transmitting antenna if TV programs have to cover the population in area of radius 64 km is
[Use Radius of earth =6.4×106 m]
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Physics>Electronics>Communication System>Elements of a Communication System
A transmitting antenna at top of a tower has a height of 50 m, and the height of receiving antenna is, 80 m. What is the range of communication for the line of sight (LOS) mode?
[use radius of the earth=6400 km]
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Physics>Electronics>Communication System>Elements of a Communication System
An antenna is mounted on a 400 m tall building. What will be the wavelength of signal that can be radiated effectively by the transmission tower upto a range of 44 km ?
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Physics>Electronics>Communication System>Elements of a Communication System
Draw a neat and labelled block diagram of a receiver.
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Physics>Electronics>Communication System>Elements of a Communication System
A TV tower is 120 m high. How much more height is to be added to it, if its coverage range is to become double?
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Physics>Electronics>Communication System>Elements of a Communication System
Explain the term attenuation in communication system.
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Physics>Electronics>Communication System>Elements of a Communication System
A transmitting antenna has a height of 320 m and that of receiving antenna is 2000 m. The maximum distance between them for satisfactory communication in line of sight mode is d. The value of  d is ________ km.
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Physics>Electronics>Communication System>Elements of a Communication System

An antenna is placed in a dielectric medium of dielectric constant 6.25. If the maximum size of that antenna is 5.0 mm, it can radiate a signal of minimum frequency of _____ GHz.

 (Given μr=1 for dielectric medium)

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Physics>Electronics>Communication System>Elements of a Communication System
A signal of 0.1 kW is transmitted in a cable. The attenuation of cable is -5 dB per km and cable length is 20 km. The power received at the receiver is 10-x W. The value of x is _________. [Gain in dB=10 log10POPi]
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Physics>Electronics>Communication System>Elements of a Communication System
For VHF signal broadcasting, _______ km2 of maximum service area will be covered by an antenna tower of height 30 m, if the receiving antenna is placed at ground. Let radius of the earth be 6400 km. (Round off to the Nearest Integer) (Take π as 3.14)
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Physics>Electronics>Communication System>Elements of a Communication System
What is attenuation in communication system?
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Physics>Electronics>Communication System>Elements of a Communication System
A TV transmitter has a range of 50 km. The height of the TV transmitter is _______ (Radius of the earth Re=6.4×106 m
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Physics>Electronics>Communication System>Elements of a Communication System
A radio transmitting tower is 50 meters high and the receiving antenna is also of similar height. The maximum distance up to which a "line of sight" mode communication between the two would be possible is approximately (take the radius of the Earth to be 6400 km )
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Physics>Electronics>Communication System>Elements of a Communication System
The increase in the height of the tower of height 200 m to get its range tripled is ________
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Physics>Electronics>Communication System>Elements of a Communication System
The TV transmission tower at a particular station has a height of 125 m. For doubling the coverage of its range, the height of the tower should be increased by
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Physics>Electronics>Communication System>Elements of a Communication System
At a particular station, the TV transmission tower has a height of 100 m. To triple its coverage range, height of the tower should be increased to
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Physics>Electronics>Communication System>Elements of a Communication System
The required height of a TV tower which can cover the population of 6.03 lakh is h. If the average population density is 100 per square km and the radius of earth is 6400 km, then the value of h will be _____ m.
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Physics>Electronics>Communication System>Elements of a Communication System
Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight ? (Assume radius of earth is 6400 km)
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Physics>Electronics>Communication System>Elements of a Communication System
The increase in the height of the tower of height 200 m to get its coverage range tripled is
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Physics>Electronics>Communication System>Elements of a Communication System
The transmitting antenna placed at the top of a tower has a height of 45 m from the ground. The distance between receiving and transmitting antennas is 40 km and the radius of earth is 6400 km. The minimum height (in m at which the receiving antenna is to be placed for satisfactory communication in LOS mode, is