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ECE :: Communication Systems

Communication Systems - Section 1
Communication Systems - Section 2
Communication Systems - Section 3
Communication Systems - Section 4
Communication Systems - Section 5
Communication Systems - Section 6
Communication Systems - Section 7
Communication Systems - Section 8
Communication Systems - Section 9
Communication Systems - Section 10
Communication Systems - Section 11
Communication Systems - Section 12
Communication Systems - Section 13
Communication Systems - Section 14
Communication Systems - Section 15
Communication Systems - Section 16
Communication Systems - Section 17
Communication Systems - Section 18
Communication Systems - Section 19
Communication Systems - Section 20
Communication Systems - Section 21
Communication Systems - Section 22
Communication Systems - Section 23
Communication Systems - Section 24
Communication Systems - Section 25
Communication Systems - section-26
Communication Systems - Section-27

  1. Which of the following is not advantage of FM over AM?

    2. A.
    Noise immunity
    B.
    Capture effect
    C.
    Fidelity
    D.
    Spluttering effect

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  2. In single tone FM discriminator (S0/N0) is

    3. A.
    proportional to deviation
    B.
    proportional to cube of deviation
    C.
    proportional to square of deviation
    D.
    none of the above

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  3. In a PCM the amplitude levels are transmitted in a 7 unit code. The no. of levels is

    4. A.
    18
    B.
    14
    C.
    128
    D.
    64

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  4. In high power AM transmission modulation is done at

    5. A.
    IF stage
    B.
    RF power
    C.
    buffer stage
    D.
    oscillator stage

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  5. Which one of the following gives maximum probability of error?

    6. A.
    ASK
    B.
    DPSK
    C.
    FSK
    D.
    PSK

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  6. FM has poor efficiency than

    7. A.
    AM
    B.
    AM-SC
    C.
    PAM
    D.
    PCM

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  7. The number of spectral component when two sine wave of same frequency multiplied is

    8. A.
    2
    B.
    3
    C.
    ∞
    D.
    4

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  8. Public address systems generally use electret microphones.

    9. A.
    True
    B.
    False

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  9. The noise at the input to an ideal frequency detector is white. The detector is operating above threshold. The power spectral density of the noise at the output is

    10. A.
    raised-cosine
    B.
    flat
    C.
    parabolic
    D.
    Gaussian

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  10. As regards BCH code, Hamming code and Reed-Solomon code

    11. A.
    BCH and Hamming code are special cases of Reed-Solomon code
    B.
    Reed-Solomon and Hamming code are special cases of BCH code
    C.
    BCH and Reed-Solomon code are special case of Hamming code
    D.
    none of the above

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