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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. If ω is the frequency of modulating voltage in FM, the modulation index is proportional to

    2. A.
    ω
    B.
    1/ω
    C.
    ω
    D.
    1/ω

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  2. Which camera tube has gamma of almost unity?

    3. A.
    Vidicon
    B.
    Plumbicon
    C.
    New vicon
    D.
    Saticon

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  3. The baud rate is

    4. A.
    not equal to signalling rate
    B.
    always equal to bit transfer rate
    C.
    equal to twice the bandwidth of an ideal channel
    D.
    equal to half the bandwidth of ideal channel

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  4. In a tape recorder

    5. A.
    the width of air gaps of record and erase heads is almost equal
    B.
    the air gap of record head is wider than the air gap of erase head
    C.
    the air gap of erase head is wider than the air gap of record head
    D.
    any of the two air gaps can be wider than the other

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  5. When satellite radio beam is aimed towards earth, it illuminates on the earth for an oval shaped area called

    6. A.
    foot print
    B.
    beam area
    C.
    satellite service area
    D.
    radiated area

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  6. Which of the following is invariably found in SSB?

    7. A.
    Tuned modulator
    B.
    Class B, RF amplifier
    C.
    Class C, audio amplifier
    D.
    All of the above

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  7. In the spectrum of a frequency modulated wave

    8. A.
    carrier frequency cannot disappear
    B.
    carrier frequency vanishes when modulation index is large
    C.
    the number of significant sidebands depends upon modulation index
    D.
    none of the above

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  8. Which of the following pulse communication system is inherently immune to noise?

    9. A.
    PPM
    B.
    PCM
    C.
    PWM
    D.
    PAM

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  9. In a PCM system, if we increase the quantization levels from 2 to 8, how do the relative bandwidth requirements vary?

    10. A.
    Get doubled
    B.
    Get tripled
    C.
    Remains same
    D.
    Become eight times

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  10. If the target area is small compared to wavelength of radar the situation is called

    11. A.
    resonance region
    B.
    Rayleigh region
    C.
    optical region
    D.
    binomial region

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