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ECE :: Communication Systems

  1. Beam width of an antenna is expressed in

  2. A.
    metres
    B.
    degrees
    C.
    ratio of two powers
    D.
    ratio of two angles

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  3. In broadcast television, the number of lines per frame is chosen to be odd number to

  4. A.
    reduce the required bandwidth
    B.
    improve resolution
    C.
    reduce peak power requirement
    D.
    make interlacing easier

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  5. In a picture tube, the video signal is applied to

  6. A.
    cathode
    B.
    grid
    C.
    any anode
    D.
    either cathode or grid

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  7. If frames are repeated at 60 Hz and each frame has 525 lines, the time for scanning one horizontal line (for progressive scanning and no interlacing) is about

  8. A.
    320 μs
    B.
    32 μs
    C.
    3.2 μs
    D.
    0.32 μs

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  9. Full duplex operation

  10. A.
    requires modems at both ends of circuit
    B.
    requires two pairs of cables
    C.
    can transfer data in both directions simultaneously
    D.
    all of the above

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  11. In a tape recorder the erase head is

  12. A.
    engaged during playback but disengaged during recording
    B.
    engaged both during recording and playback
    C.
    disengaged both during recording and playback
    D.
    engaged during recording but disengaged during playback

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  13. Consider the following statements as regards advantages of CCD sensors as camera pick up tube

    1. High sensitivity
    2. Good spectral response
    3. Image lag absent
    Out of the above which are correct

  14. A.
    1, 2, 3
    B.
    1, and 2 only
    C.
    1 and 3 only
    D.
    2 and 3 only

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  15. Some desirable features of a computer communication network are

    1. It should accept an intended transmission without excessive delay
    2. The data arriving at a receiving point should be processed rapidly
    3. When a transmission calls for a response, the delay of response should be minimum.
    Which of the above are true?

  16. A.
    1 and 2 only
    B.
    1 and 3 only
    C.
    1, 2, 3
    D.
    2 and 3 only

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  17. Television transmission is by

  18. A.
    ground waves
    B.
    sky waves
    C.
    space waves
    D.
    all of the above

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  19. In the television system in India, the aspect ratio is

  20. A.
    4 : 3
    B.
    3 : 4
    C.
    5 : 4
    D.
    4 : 5

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