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प्रश्न
Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?
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उत्तर
No, signals of frequency greater than 30 MHz will not be reflected by the ionosphere but will penetrate through the ionosphere.
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संबंधित प्रश्न
Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves?
(a) 10 kHz
(b) 10 MHz
(c) 1 GHz
(d) 1000 GHz
Digital signals
(i) Do not provide a continuous set of values,
(ii) Represent values as discrete steps,
(iii) Can utilize binary system, and
(iv) Can utilize decimal as well as binary systems.
Which of the above statements are true?
(a) (i) and (ii) only
(b) (ii) and (iii) only
(c) (i), (ii) and (iii) but not (iv)
(d) All of (i), (ii), (iii) and (iv).
Answer the following question :
Define 'bandwidth' and describe briefly its importance in communicating signals ?
Block diagram of a receiver is shown in the figure:
(a) Identify ‘X’ and ‘Y’.
(b) Write their functions.
Distinguish between ‘Analog and Digital signals’.
Write any two factors which justify the need for modulating a signal ?
Write briefly any two factors which demonstrate the need for modulating a signal. Draw a suitable diagram to show amplitude modulation using a sinusoidal signal as the modulating signal.
What do you mean by bandwidth of a signal? Give its importance.
Differentiate between Analog and Digital communication.
A TV tower has a height of 100 meter. If the coverage range is to be made three times then the height of the tower should be increased by.
The area of the region covered by the TV broadcast by a TV tower of 100 m height is (Radius of the earth = 6.4 × 106 m):
Long distance short-wave radio broadcasting uses
Broadcasting antennas are generally
The sound produced by a funning fark is a sort of:-
The audio frequency range is
Broadcast band in which FM lies is ______.
