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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 oscillator is not in FM?

    2. A.
    Crystal oscillator
    B.
    Hartley oscillator
    C.
    Colpitts oscillator
    D.
    All of the above

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  2. Assertion (A): If a carrier is modulated by three sine waves and m1, m2, m3 are the modulation indices, the total modulation index mt is
    mt = (m12 + m22 + m32)0.5

    Reason (R): An AM, higher the level of modulation, lower is the audio power required to produce modulation.

    3. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

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  3. If M (jω) = £[m(t)] where £ denotes Fourier transform, then £[m(t) cos ωct] =

    4. A.
    M (jω + jωc)
    B.
    M (jω - jωc)
    C.
    M (jω + jωc) + M (jω - jωc)
    D.
    [M (jω + jωc) + M (jω - jωc)]

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  4. When a wave reaches the open circuited end of a line

    5. A.
    all the forward energy is reflected by the open circuit
    B.
    all the forward energy is absorbed by the open circuit
    C.
    a small portion of energy is radiated into atmosphere and the remaining energy is reflected
    D.
    either (a) or (b)

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  5. A signal having uniformly distributed amplitude in the interval (- V to + V) is to be encoded using PCM with uniform quantization. The signal to quantization noise ratio is determined by

    6. A.
    dynamic range of signal
    B.
    sampling rate
    C.
    number of quantizing levels
    D.
    power spectrum of signal

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  6. Bipolar signalling uses the following bits

    7. A.
    -1, +1
    B.
    -1, 0, +1
    C.
    0, 1
    D.
    -1, 0

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  7. The first geostationary satellite was named

    8. A.
    Intelsat I
    B.
    Intelsat II
    C.
    Intelsat III
    D.
    Early bird

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  8. Typical value of power consumption of TV transmitter is

    9. A.
    0.5 kVA
    B.
    2 kVA
    C.
    50 kVA
    D.
    1000 kVA

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  9. In a colour TV receiver, which of the following incorporates colour saturation control?

    10. A.
    Chroma detector
    B.
    Colour killer circuit
    C.
    SAW filter
    D.
    Chroma amplifier

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