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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. Each of the following equation expressing decibel gain is correct except

    2. A.
    B.
    C.
    D.
    db gain = 20 log10 V/R1/V/R2

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  2. The satellites used for intercontinental communication are called

    3. A.
    Comsat
    B.
    Domsat
    C.
    Marisat
    D.
    Intelsat

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  3. Armoured submarine cable is used

    4. A.
    to prevent insulation breakdown due to high voltage
    B.
    to protect cable at great depths.
    C.
    to prevent inadverent damage due to ploughing in
    D.
    for the shallow shore ends of cable.

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  4. The frequency deviation of a FM signal produced from PM is

    5. A.
    identical to that of FM signal produced by direct method
    B.
    larger than that of a FM signal produced by direct method
    C.
    directly proportional to the peak amplitude and the frequency of modulating signal
    D.
    directly proportional to the peak amplitude of the modulating signal

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  5. Good frequency stability can be available

    6. A.
    crystal oscillators
    B.
    Hartley oscillators
    C.
    colpitts oscillators
    D.
    none of the above

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  6. In a colour TV receiver, PAL Dematrix consists of

    7. A.
    chroma detector to separate the three primary colours
    B.
    delay line and PAL matrix to give U and V signals
    C.
    delay line and PAL matrix to give RGB colours
    D.
    none of the above

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  7. A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?

    8. A.
    6.66 kW
    B.
    5 kW
    C.
    4.9 kW
    D.
    4.23 kW

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  8. For a resistance of about 15 kΩ operating in a frequency range of a few MHz, the noise voltage is in the range of

    9. A.
    a few μV
    B.
    about 100 μV
    C.
    a few μV
    D.
    a few volts

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  9. In a 50 cm TV tube, a path difference of 2 km between direct wave and interfering wave would mean a displacement between main image and ghost image equal to

    10. A.
    0.3 cm
    B.
    3 cm
    C.
    6 cm
    D.
    9 cm

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  10. In a colour TV receiver, the sound intercarrier IF is generated in

    11. A.
    video detector
    B.
    video IF amplifier
    C.
    tuner mixer stage
    D.
    limiter stage

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