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Which of the following four alternatives...

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

A

to increase the selectivity

B

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

C

to reduce the size of antenna

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
Modulation does not change time lag between transmission and reception.
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Knowledge Check

  • Which of following four alternatives is not correct? We need modulation:

    A
    to reduce the time lag between transmission andreception of the information signal
    B
    to reduce the size of antenna
    C
    to reduce the e fractional band width, that is the ratio of the signal band width to the centre frequency
    D
    to increase the selectivity.

  • In modulation we

    A
    separate the audio frequency signal from the carrier wave
    B
    superimpose the audio frequency signal over a carrier wave
    C
    separate the carrier wave from the modulated wave
    D
    none of the above

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    B
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    C
    They always stimulate immune system
    D
    Specific immuno-modulators stimulate the immuno response of immune system, whereas some other immuno-modulators inhibits it

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