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An antenna is a device...

An antenna is a device

A

That converts electromagnetic energy into radio frequency signal

B

That converts radio frequency signal into electromagnetic energy

C

That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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  2. When the modulating frequency is doubled, the modulation index is halv...

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  3. An antenna is a device

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  5. Indicate which one of the following system is digital

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

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  7. The waves used in telecommunication are

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  8. In an FM system a 7kHz signal modulates 108 MHz carrier so that freque...

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  9. Consider telecommunication through optical fibres. Which of the follow...

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  10. The phenomenon by which light travels in an optical fibres is

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  12. Advantage of optical fibre

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  13. In frequency modulation

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  14. Audio signal cannot be transmitted because

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  15. In which of the following remote sensing technique is not used?

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  16. For sky wave propagation of a 10 MHz signal, what should be the minimu...

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  17. What should be the maximum acceptance angle at the aircore interface o...

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  18. A sky wave with a frequency 55 MHz is incidnet on D-region of earth's ...

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  19. In a diode AM- detector, the output circuit consist of R=1 k Omega and...

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  20. Consider an optical communication system operating at lambda=800 nm. S...

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