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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 telephone channel requires a bandwidth of about

    2. A.
    1 kHz
    B.
    3 kHz
    C.
    10 kHz
    D.
    50 kHz

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  2. As per Shannon-Hartley theorem, a noise less Gaussian channel has

    3. A.
    zero capacity
    B.
    infinite capacity
    C.
    small capacity
    D.
    none of the above

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  3. DVD uses

    4. A.
    Laser beam for both recording and playback
    B.
    Laser beam for recording and video head for playback
    C.
    Video head for recording and laser beam for playback
    D.
    None of the above

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  4. Fourier analysis indicate that a square wave can be represented as

    5. A.
    a fundamental sine wave and odd harmonics
    B.
    a fundamental sine wave and even harmonics
    C.
    a fundamental sine wave and harmonics
    D.
    fundamental and subharmonic sine waves

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  5. FM transmitting and receiving equipment as compared to AM equipment is

    6. A.
    costly
    B.
    cheaper
    C.
    almost equally costly
    D.
    none of the above

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  6. An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

    7. A.
    200 and 1.01
    B.
    200 and 10.01
    C.
    200 and 100.1
    D.
    200 and 200

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  7. If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

    8. A.
    5
    B.
    4.9
    C.
    995
    D.
    10

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  8. Which one of the following is analog?

    9. A.
    PCM
    B.
    PWM
    C.
    Delta modulation
    D.
    Differential PCM

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  9. The disadvantage of FM over AM is that

    10. A.
    high output power is needed
    B.
    high modulating power is needed
    C.
    noise is very high for high frequency
    D.
    large bandwidth is required

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  10. Which of the following is a digital modulation technique?

    11. A.
    PCM
    B.
    PSK
    C.
    DM
    D.
    All

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