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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. PAL stands for

    2. A.
    Phase Attenuation by Line
    B.
    Phase Alternation by Line
    C.
    Parabolic Alternation by Line
    D.
    Picture Alternation by Line

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  2. In free space, line of sight propagation case, the transmission losses between transmitter and receiver increase with frequency (f) as

    3. A.
    f
    B.
    f2
    C.
    f4
    D.
    f1/2

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  3. A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be

    4. A.
    1015 kHz and 985 kHz
    B.
    1030 kHz and 970 kHz
    C.
    13 kHz and 17 kHz
    D.
    14 kHz and 16 kHz

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  4. PCM : Quantising Noise :: Transistor :

    5. A.
    Partition noise
    B.
    Shot noise
    C.
    Whirl
    D.
    No noise

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  5. The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly

    6. A.
    90%
    B.
    80%
    C.
    75%
    D.
    70%

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  6. In digital TV digital imaging standard comprises

    7. A.
    six profiles and four levels
    B.
    four levels and six profiles
    C.
    six profiles and six levels
    D.
    four profiles and four levels

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  7. The 2 out of 5 code has

    8. A.
    two 0s and three 0s in each code group
    B.
    one 1s and four 0s in each code group
    C.
    four 1s and one 0s in each code group
    D.
    three 1s and two 0s in each code group

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  8. Consider the following statements as regards BPSK and QPSK:

    1. In BPSK we deal individually with each bit of duration Tb
    2. In QPSK we lump two bits to form a symbol
    3. In both BPSK and QPSK signal changes occur at bit rate
    4. In QPSK the symbol can have any one of four possible values
    Which of the above statements are correct?

    9. A.
    1, 2, 3, 4
    B.
    1, 2, 3
    C.
    1, 2, 4
    D.
    2, 3, 4

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  9. In equally tampered musical scale, an octave is divided into

    10. A.
    12 intervals
    B.
    10 intervals
    C.
    7 intervals
    D.
    5 intervals

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  10. Entropy gives

    11. A.
    measure of Uncertainty
    B.
    rate of Information
    C.
    average information
    D.
    probability of Information

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