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Why is modulation necessary at all ?...

Why is modulation necessary at all ?

A

To select suitable size of antenna

B

To increase effective power radiated by antenna

C

To avoid mixing up of signals from different transmitters

D

All of these

Text Solution

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The correct Answer is:
D
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AAKASH INSTITUTE-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION A Objective (Only one answer)
  1. Range of frequencies allotted for commercial FM radio broadcast is

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  2. If lambda is wavelength of radio signals to be transmitted, then the l...

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  3. Why is modulation necessary at all ?

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  4. A device that connects one computer to another across ordinary telepho...

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  5. Three waves A,B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respe...

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  6. The velocity of electromagnetic waves in a dielectric medium (in(r)=4)...

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  7. A speech signal of 3 kHz is used to modulate a carrier signal of frequ...

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  8. An 'antenna' is:

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  9. A message signal of freuency omega(m) is superposed on a carrier wave ...

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  10. A male voice after modulation-transmission sounds like that of a femal...

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  11. A basic communication system consists of (A) transmitter (B) informat...

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  12. Identify the mathematical expression for amplitude modulated wave:

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  13. The distance between consecutive maxima and minima is given by-

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  14. Long distance short-wave radio broadcasting uses

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  15. Broadcasting antennas are generally

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  16. For television broadcasting, the frequency employed is normally

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  17. The sound waves after being converted into electrical waves are not tr...

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  18. The process of superimposing signal frequency (i.e. audio wave) on the...

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  19. In an amplitude modulated wave for audio frequency of 500 "cycle"//sec...

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  20. If three wave no atmosphere, the average temperature on the surface of...

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