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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. Skip distance depends on time of day and angle of incidence.

    2. A.

     True
    B.

     False

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  2. It is found that a ship to ship communication suffers from fading. This can be avoided by using

    3. A.

     Space diversity
    B.

     Frequency diversity
    C.

     Broad band antenna
    D.

     Directional antenna

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  3. A buffer amplifier is

    4. A.

     A double-tuned amplifier
    B.

     A high gain D.C. amplifier
    C.

     A cathode follower stage
    D.

     None of the above

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  4. SSB can be generated by

    5. A.

     Filter method
    B.

     Phase cancellation method
    C.

     Good attenuation characteristics
    D.

     All of the above

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  5. What is the purpose of peak clipper circuits in radio transmitters?

    6. A.

     To prevent overmodulation
    B.

     To reduce bandwidth
    C.

     To increase bandwidth
    D.

     To regulate oscillator I/P voltage

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  6. The direction of rotation of a CD is

    7. A.

     Clockwise
    B.

     Anticlockwise
    C.

     Clockwise or anticlockwise depending on frequency of data stored
    D.

     Mostly anticlockwise but some times clockwise

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  7. A woofer should be fed from the input through a

    8. A.

     Low pass filter
    B.

     High pass filter
    C.

     Band pass filter
    D.

     Band stop filter

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  8. The characteristic impedance of a twin wire feeder used for TV signals is about

    9. A.

     1000 ohm
    B.

     500 ohm
    C.

     300 ohm
    D.

     100 ohm

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  9. In EM waves, polarization

    10. A.

     Is always vertical in an isotropic medium
    B.

     Is caused by reflection
    C.

     Is due to transverse nature of waves
    D.

     Results from longitudinal nature of waves

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  10. The frequency range of 300 kHz to 3000 kHz is known as

    11. A.

     Low frequency
    B.

     Medium frequency
    C.

     High frequency
    D.

     Very high frequency

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