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What sign (+ve or-ve) is given to the fo...

What sign (+ve or-ve) is given to the focal length of a concave mirror?

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What sign (+ve or-ve) is given to the focal length of a convex mirror?

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BINA LIBRARY-COMMUNICATION SYSTEM -EXERCISE
  1. What are the two basic modes of communicatiuons?

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  2. What is demodulation? Why is satellite communication necessary for TV ...

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  3. What sign (+ve or-ve) is given to the focal length of a concave mirror...

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  4. mention the function of shunt capacitor ?

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  5. Draw block diagram of a generalized communication system.

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  6. Compare AM with FM wave.

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  7. Draw a labelled block diagram of a radio transmitter.

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  8. What are the different transmission media for communication?

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  9. Define the term noise used in electronic communication

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  10. Disucss briefly the three modes of propagation of electromagnetic wave...

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  11. Why is modulation necessary?

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  12. What is amplitude modulation? Explain with diagram.

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  13. What sign (+ve or-ve) is given to the focal length of a convex mirror?

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  14. For long distance radio broadeast, we use short wave only. Why?

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  15. Why satellites are used for long distance TV transmission.

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  16. in what respects radio waves and gamma rays are different ?

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  17. Why sky wave are not used in television signals.

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  18. expalin why Tv transmission are usually made high .

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  19. why high frequency carrier waves are employed for transmission ?

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  20. why is short wave communication over long distance not possible by sur...

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