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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 1000 kHz carrier is simultaneously modulated by 300 Hz and 2 kHz audio sine wave. Which of the following frequencies will not be present in the output?

    2. A.
    998 kHz
    B.
    999.7 kHz
    C.
    1000.3 kHz
    D.
    700 kHz

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  2. SWR for a transmission line is infinity when the load is

    1. Short circuit
    2. Complex impedance
    3. Open circuit
    4. Pure reactance
    Of the above statements:

    3. A.
    1, 3, 4 are correct
    B.
    1 and 3 are correct
    C.
    2, 3, 4 are correct
    D.
    1, 2, 4 are correct

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  3. The discone antenna is

    4. A.
    used in UHF range
    B.
    circularly polarized
    C.
    used in radar
    D.
    used as a direction finding antenna

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  4. The direction of pick up in a CD is

    5. A.
    linear from centre towards edge
    B.
    linear from edge to centre
    C.
    nonlinear from centre to edge
    D.
    nonlinear from edge to center

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  5. A (75 - j 50) Ω load is connected to a coaxial line of Z0 = 75 Ω at 10 GHz. The best method of matching consists of using

    6. A.
    a capacitance at some specific distance from load
    B.
    a short circuited stub at some specific distance from load
    C.
    an inductance at load
    D.
    a short circuited stub at load

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  6. In PCM the amplitude levels are transmitted in a 7 unit code. Sampling frequency is 10 kHz. The bandwidth should be

    7. A.
    5 kHz
    B.
    35 kHz
    C.
    70 kHz
    D.
    5 MHz

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  7. In colour television V and U signals are

    8. A.
    same as I and Q signal
    B.
    same as R - Y and B - Y
    C.
    modified I and Q signal
    D.
    modified R - Y and B - Y

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  8. Which of the following has highest power gain?

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

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  9. Two messages m1, and m2 have a probability of 0.5 each. The entropy is

    10. A.
    0.25
    B.
    0.5
    C.
    0.75
    D.
    1

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  10. A TV receiver is 40 cm wide and 30 cm high. The EHT supply required is about

    11. A.
    2kV
    B.
    20 kV
    C.
    53 kV
    D.
    10 W

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