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प्रश्न
Ionosphere mainly consists of _______.
पर्याय
positive ions and electrons
water vapour and smoke
ozone layer
dust particles
उत्तर
positive ions and electrons
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संबंधित प्रश्न
Draw a block diagram of generalized communication system.
Draw a neat, labelled block diagram for a generalised communication system.
Explain briefly two commonly used applications of the ‘Internet’.
What are the three basic units in communication systems ? Write briefly the function of each of these.
Write any three applications of the Internet used in communication systems.
The figure given below shows the block diagram of a generalized communication system. Identify the element labelled 'X' and write its function.
Write two basic modes of communication
Any device that converts one form of energy into another is termed as ______.
(A) amplifier
(B) transducer
(C) receiver
(D) demodulator
Draw the block diagram of a receiver in communication system
Explain the terms : Receiver in communication system
Which basic mode of communication is used in satellite communication?
Distinguish between a transducer and a repeater.
What type of wave propagation is used in the basic mode of communication?
Write, giving a reason, the frequency range used in this mode of communication of propagation.
Explain the basic concept of mobile telephoning.
Answer the following question :
Write the functions of transducer and repeater ?
Explain, with the help of a suitable diagram, the space wave mode of propagation. Give two examples in communication systems where this mode is used. What is the frequency range of these waves? Give reason for using this range of frequency.
Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies?
A transmitting antenna at the tope of a tower has a height of 20 m and the height of the receiving antenna is 45 m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth = 6.4 × 106 m)
Explain the function of a repeater in a communication system.
Explain the terms (a) Transducer and (b) Attenuation in communication system.
A transmitting antenna of height h and the receiving antenna of height 45 m are separated by a distance of 40 km for satisfactory communication in line of sight mode. Then the value of h is (given radius of the earth is 6400 km):
Which of the following is the communication channel in case of radio communication?
