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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. According to CCIR standards, the Vestigial Sideband (VSB)

    2. A.
    video frequencies upto 4 MHz are transmitted
    B.
    video frequencies upto 5 MHz are transmitted
    C.
    video frequencies upto 5.5 MHz are transmitted
    D.
    video frequencies upto 6 MHz are transmitted

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  2. Line of sight transmission is used in

    3. A.
    radio frequencies below 1 MHz
    B.
    VHF only
    C.
    audio signals only
    D.
    VHF and UHF

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  3. A typical value of insertion loss of SAW filter is

    4. A.
    15 dB
    B.
    2 dB
    C.
    40 dB
    D.
    60 dB

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  4. In phase modulation, the phase deviation is

    5. A.
    proportional to the amplitude of the signal and varies with frequency
    B.
    remains constant while amplitude and frequency of signal varies
    C.
    proportional to the amplitude of the signal and independent of the frequency
    D.
    none of the above

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  5. In the human eye, an image persists for a time of about

    6. A.
    1 second
    B.
    0.1 second
    C.
    0.05 second
    D.
    0.02 second

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  6. The different channels in a TDM receiver are separated by

    7. A.
    integration
    B.
    differentiation
    C.
    AND gate
    D.
    OR gate

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  7. In a pulsed RADAR typical value of pulse duration and pulse frequency respectively are

    8. A.
    1 μs and 50 Hz
    B.
    1 μs and 500 Hz
    C.
    4 μs and 50 Hz
    D.
    4 μs and 500 Hz

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  8. In a hi-fi system the nonlinear distortion should be less than

    9. A.
    10%
    B.
    5%
    C.
    2%
    D.
    1%

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  9. A pure tone at 1000 Hz has a dB level of 50 dB. If two such tones exist simultaneously the dB level is about

    10. A.
    50 dB
    B.
    53 dB
    C.
    100 dB
    D.
    200 dB

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  10. The HV and other voltage supplies for a TV receiver are obtained from IHVT. The full name for this device is

    11. A.
    Internal high voltage transformer
    B.
    Integrated high voltage transformer
    C.
    Instant high voltage transformer
    D.
    Interleaved high voltage transformer

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