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Define modulation. Write any two types o...

Define modulation. Write any two types of modulation of carrier wave.

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In an amplitude modulation with modulation index 0.5 the ratio of the carrier wave to that of side band in the modulated wave is

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Knowledge Check

  • The concepts of communication are ( a ) mode of communication ( b ) need for modulation ( c ) types of modulation ( d ) detection of modulated wave

    A
    `a`, `b`, `c` are true
    B
    `b`, `c`, `d` are true
    C
    `c`, `d`, `a` are true
    D
    `a`, `b`, `c` & `d`are true

  • Assertion: Amplitude modulation shows more interference than frequency modulation with noise. Reason: Interference is function of amplitude of modulation wave with carrier wave.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is the currect explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • A: The bandwidth of a modulated signal is 2f_(m) in amplitude modulation, where f_(m) is the frequency of the modulating signal. R: In case of amplitude modulation the frequency of a modulated signal is equal to the frequency of the carrier wave.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

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    In frequency modulation, the frequency of the modulated wave varies as

    If a number of sine waves with modulation indices n,n,n ........ modulate a carrier wave, then total modulation index ( n ) of the wave is

    If a number of sine waves with modulation indices n_(1),n_(2),n_(3) … modulate a carrier wave, then total modulation index (n) of the wave is

    Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. A radio frequency carrier wave can be modulated using a-

    A sinusoidal carrier voltage of 120 V is amplitude modulated by a sinusoidal voltage of frequency 10KHz. What is the modulation index if the maximum modulated carrier amplitude is 150 V ?

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