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Which of the following four alternatives...

Which of the following four alternatives is not correct, We need modulation :-

A

to reduce the time lag between transmission and reception of the information signal

B

to reduce the size of antenna

C

to reduce the fractional band width, that is the ratio of the signal band width to the centre frequency

D

to increase the selectivity

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The correct Answer is:
A
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DISHA PUBLICATION-COMMUNICATION SYSTEM -EXERCISE-1 : Concept Builder ( Topicwise )
  1. Depth of modulation in terms of E(max) and E(min) is

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  2. A tuned amplifier circuit is used to generate a carrier frequency of 2...

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  3. For a single side band transmission a balanced modulator is used to

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  4. Audio in television signals are

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  5. Skip distance does not depend on

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  6. In PCM if the transmission path is very long

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  7. 100% modulation in FM means

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  8. Encoding of signal is required for

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  9. Picture signal of TV-signal is

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  10. A geosynchronous satellite is

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  11. Which one of the following statement is wrong

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  12. Identify the incorrect statement from the following.

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  13. If the heights of transmitting and the receiving antennas are each equ...

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  14. Which of the following modulated signal has the best noise tolerance?

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  15. The rms value of a carrier voltage is 100 volts. Compute its rms value...

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

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  17. The gap between the frequency of the side bands in an amplitude modula...

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  18. Which of the following four alternatives is not correct, We need modul...

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  19. An audio signal represented as 25 sin 2pi ( 2000 t) amplitude modulate...

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  20. If a carrier wave c(t)=A sin omega(c)t is amplitude modulated by a mod...

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