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Three waves A,B and C of frequencies 160...

Three waves A,B and C of frequencies 1600 KHz, 5MHz and 60 MHz, respectively are to be trasnmitted from one place to another which of the following is the most appropriate mode of communication?

A

A is transmitted via space wave while B and C are transmitted via sky wave

B

A is transmitted via ground wave, B via sky wave and C via space wave

C

B and C are transmitted via ground wave while A is transmitted via sky wave

D

B is transmitted via ground wave while A and C are transmitted via space wave

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION A Objective (Only one answer)
  1. Why is modulation necessary at all ?

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

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  3. Three waves A,B and C of frequencies 1600 KHz, 5MHz and 60 MHz, respec...

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

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  5. A speech signal of 3 KHz is used to modulate a carrier signal of frequ...

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  6. An 'antenna' is:

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  7. A message signal of frequency omega(m) is superposed on a carrier wave...

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

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  9. A basic communication system consists of A. transmitter. B. informati...

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  10. Identify the mathematical expression for amplitude modulated wave

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

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  12. Long distance short-wave radio broadcasting uses

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  13. Broadcasting antennas are generally

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  14. For television broadcasting, the frequency employed is normally

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

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  16. The process of superimposing signal frequency (i.e., audio wave) on th...

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  17. In an amplitude modulated wave for audio frequency of 500 cycles/secon...

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  18. If there were no atmosphere, the average temperature on the surface of...

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  19. A TV transmission tower has a height of 240m. Signals broadcast from t...

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  20. Radiowaves of constant amplitude can be generated with

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