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A modem is a...

A modem is a

A

modulator-demodulator

B

multiplexer-demultiplexer

C

multivibrator-degenerator

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
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DISHA PUBLICATION-COMMUNICATION SYSTEM -EXERCISE-1 : Concept Builder ( Topicwise )
  1. During the process of transmission & reception the signal gets deterio...

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  2. Optical fibres transmit light along its axis, by the process of

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  3. A modem is a

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  4. Which of the following AM-scheme requires the minimum transmitted powe...

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  5. Buffer amplifier is used at the transmitting end to

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  6. A transducer used at the transmitting end, serves the purpose of conve...

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  7. The purpose of a detector at the receiving end is

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  8. The term channel is used to indicate

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  9. Optical fibre are used for long distance communication because

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  10. For transmission of speeches, talks, music, dramas etc. is used

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  11. E.m. wave of audible frequency cannot be directly propagated over a lo...

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  12. For transmission of e.m.wave of audible frequency, these waves are sup...

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  13. Wave obtained on superimposition of audible frequency e.m. wave is kno...

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  14. In an ionized medium, the phase velocity vp group velocity vg and th...

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  15. Sky wave propagation is not possible for waves of frequencygt 30 MHz ...

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  16. Long range transmission of TV-signal is done by

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  17. Communication on ground is through electromagnetic waves of wavelength

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  18. Earth's atmosphere is transparent for

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  19. Ground wave propagation is suitable for

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  20. During ground wave propagation the transmitted waves gets attenuated b...

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