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'Need for modulation'' arises due to whi...

'Need for modulation'' arises due to which of the following reasons?

A

Power radiated by an antenna `prop (1/lambda)^2`

B

It allows multiple user-friendly communication

C

Height of antenna required `prop (lambda/4)`

D

All of these

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION B Objective (Only one answer)
  1. Which of the following is an advantage of FM over AM?

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  2. The process of changing some characteristic of a carrier wave in accor...

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  3. Modulation is done in

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  4. 'Need for modulation'' arises due to which of the following reasons?

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  5. The area of the region covered by the TV., broadcast by a T.V. tower o...

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  6. A ground receiver station is receiving a signal at 500 MHz transmitted...

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  7. AN information signal of 150MHz is to be sent across a distance of 40k...

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  8. In an AM wave for audio frequency of 3400 cycle/s, the appropriate car...

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  9. For VHF television broadcasting, the frequency employed is generally

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  10. On a particular day the maximum frequency reflected from the lonospher...

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  11. Line of sight (LOS) communication is also known as

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  12. If a carrier wave of 1000 kHz is used to carry the signal, the length ...

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  13. Modem is a device used for

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  14. In frequency modulation

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  15. The communication satellites are parked at a height of (from surface o...

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  16. 3-30 MHz frequency range is known as

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  17. Long distance short-wave radio broadcasting uses

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  18. A photodetector is made from a compound semiconductor with band gap 0....

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  19. What is the range of frequencies used in state satellite communication...

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  20. Digital signals

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