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Define modulation...

Define modulation

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When the modulating frequency is doubled, the modulation index is halved and the modulating voltage constant the modulation system is

What is the modulation index of an over modulated wave

Assertion : Higher the modulation index the reception will be strong and clear. Reason : The degree, to which the carrier wave is modulated is called modulation index.

In amplitude modulation

In frequency modulation

CHETANA PUBLICATION-ELECTROMAGNETIC WAVES AND COMMUNICATON SYSTEM-EXERCISE
  1. How does the effective power radiated by an antenna vary with waveleng...

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  2. Why should broadcasting programs use different frequencies?

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  3. Define modulation

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  4. What is demodulation?

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  5. Explain why is modulation needed.

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  6. State the different types of modulation.

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  7. What type of modulation is required for television broadcast?

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  8. Why does amplitude modulation give noisy reception?

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  9. Why are high frequency carrier waves used for transmission of audio si...

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  10. The EM wave emitted by theSun and responsible for heating the Earth's ...

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  11. Choose the correct options. Earth's atmosphere is rechest in

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  12. How does the frequency of a beam of ultraviolet light change when it t...

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  13. The direction of EM wave is given by

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  14. The maximum distance upto which TV transmission from a TV tower of he...

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  15. The waves used by artificial satellites for communication purposes are

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  16. If a TV telecast isto cover a radius of 640 km, what should be the hei...

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  17. In a communication system, noise is most likely to affect the signal.

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  18. For television broadcasting , the frequency employed is normally

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  19. A device that converts one form of energy into another form is termed ...

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  20. The process of regaining the information from carrier wavesis called.....

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