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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 circuits cannot be demodulate SSB?

    2. A.
    Product detector
    B.
    Balanced modulator
    C.
    Phase discriminator
    D.
    BFO

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  2. Figure shows the arrangement of

    3. A.
    FM
    B.
    PM
    C.
    AM-DSB
    D.
    AM-SSB

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  3. During day time ionosphere can be considered to be consisting of

    4. A.
    D, E, F1 and F2 layers
    B.
    D, E, F1 layers
    C.
    D, E, F2 layers
    D.
    D and E layers

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  4. Baudot code is a six bit code.

    5. A.
    True
    B.
    False

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  5. PWM can be generated

    6. A.
    by a free running multivibrator
    B.
    by integrating the signal
    C.
    by a monostable multivibrator
    D.
    by differentiating pulse position modulation

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  6. Which of the following microphones has highest output impedance?

    7. A.
    Carbon
    B.
    Ribbon
    C.
    Crystal
    D.
    Condenser

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  7. Consider the following statements about PCM

    1. PCM is not noise resistant
    2. PCM requires complex encoding and quantizing circuitry
    3. PCM requires large bandwidth
    Which of the above are correct?

    8. A.
    1 only
    B.
    1, 2, 3
    C.
    2, 3
    D.
    1 and 3

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  8. In a television transmitter, the output stage is most likely to be

    9. A.
    screen modulated class C amplifier
    B.
    plate modulated class C amplifier
    C.
    grid modulated class A amplifier
    D.
    grid modulated class C amplifier

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  9. The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is

    10. A.
    6.23
    B.
    18.69
    C.
    10.46
    D.
    24.92

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  10. The efficiency of a direct radiating cone type loudspeaker is about

    11. A.
    5%
    B.
    20%
    C.
    50%
    D.
    80%

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