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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. In practical commercial FM system, channel bandwidth is

    2. A.
    150 kHz
    B.
    100 kHz
    C.
    88 MHz
    D.
    108 MHz

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  2. In EM waves, polarization

    3. A.
    is always vertical in an isotropic medium
    B.
    is caused by reflection
    C.
    is due to transverse nature of waves
    D.
    results from longitudinal nature of waves

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  3. The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

    4. A.
    0.5 kW
    B.
    8 kW
    C.
    20 kW
    D.
    50 kW

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  4. PAM stands for

    5. A.
    Pulse Analogue Modulation
    B.
    Phase Analogue Modulation
    C.
    Pulse Amplitude Modulation
    D.
    Phase Amplitude Modulation

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  5. The characteristic impedance of a twin wire feeder used for TV signals is about

    6. A.
    1000 ohm
    B.
    500 ohm
    C.
    300 ohm
    D.
    100 ohm

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  6. In a FM receiver, amplitude limiter

    7. A.
    amplifiers low frequency signals
    B.
    reduces the amplitude of signals
    C.
    eliminates any change in amplitude of received FM signals
    D.
    none of the above

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  7. A buffer amplifier is

    8. A.
    a double-tuned amplifier
    B.
    a high gain D.C. amplifier
    C.
    a cathode follower stage
    D.
    none of the above

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  8. Leak type bias is used in plate modulated class C amplifier to

    9. A.
    increase the bandwidth
    B.
    prevent over modulation
    C.
    prevent excessive grid current
    D.
    prevent tuned circuit damping

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  9. The direction of rotation of a CD is

    10. A.
    clockwise
    B.
    anticlockwise
    C.
    clockwise or anticlockwise depending on frequency of data stored
    D.
    mostly anticlockwise but some times clockwise

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  10. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

    11. A.
    improved efficiency
    B.
    better linearity
    C.
    high power output per transistor
    D.
    the lower modulating power requirement

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