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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. A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is

    2. A.
    2
    B.
    4
    C.
    3
    D.
    5

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  2. When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power

    3. A.
    remains the same
    B.
    increases by 25%
    C.
    increases by 33.3%
    D.
    increases by 50%

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  3. Quantizing error occurs in

    4. A.
    TDM
    B.
    FDM
    C.
    PCM
    D.
    PWD

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  4. In audio cassettes the width of each recording track is

    5. A.
    5 mm
    B.
    2.5 mm
    C.
    1.5 mm
    D.
    1 mm

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  5. The most commonly used transistor amplifier circuit is

    6. A.
    CB
    B.
    CC
    C.
    CE
    D.
    CE or CC

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  6. When energy is fed into open wire transmission line the energy may get dissipated due to

    7. A.
    radiation
    B.
    conductor heating
    C.
    dielectric heating
    D.
    all of the above

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  7. Fourier series expansion of a real periodic signal with fundamental frequency is given by It is given that c3 = 3 + j5. then c-3 is

    8. A.
    5 + j3
    B.
    -3 - j5
    C.
    -5 + j3
    D.
    3 - j5

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  8. Loudness control gives

    9. A.
    high boost to bass and little boost to treble
    B.
    equal boost to bass and treble
    C.
    less boost to bass and more boost to treble
    D.
    less boost to both bass and treble

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  9. A mobile telephone has a range of about

    10. A.
    50 km
    B.
    10 km
    C.
    1 km
    D.
    0.1 km

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  10. If transmitted power is 75 kW, the field strength at 30 km distance will be about

    11. A.
    10 V/m
    B.
    1 V/m
    C.
    50 mV/m
    D.
    2 mV/m

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