Home / ECE / Satellite Communication :: Section 1

ECE :: Satellite Communication

  1. To make antenna more directional, either its size must be increased or

  2. A.
    the number of its feed horns must be increased
    B.
    the frequency of its transmission must be increased
    C.
    its effective isotropic radiated power (EIRP) must be increased
    D.
    its footprint must be increased

  3. India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from

  4. A.
    USSR
    B.
    USA
    C.
    UK
    D.
    UP

  5. Satellite launch sites are invariably located on Eastern seaboards to ensure that

  6. A.
    launch takes place eastward
    B.
    expenditure of propulsion fuel is reduced during plane changing
    C.
    the satellite achieves circular orbit quickly
    D.
    spent rocket motor and other launcher debris falls into the sea

  7. The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.

  8. A.
    0.1
    B.
    1.0
    C.
    2.0
    D.
    0.5

  9. The number of days when Earth's shadow falls on a geosynchronous satellite is

  10. A.
    88
    B.
    277
    C.
    5
    D.
    10

  11. Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.

  12. A.
    INSAT-IA
    B.
    INSAT-IB
    C.
    INSAT-IC
    D.
    INSAT-ID

  13. Radio broadcasting is a familiar example of

  14. A.
    space multiplexing
    B.
    time multiplexing
    C.
    frequency multiplexing
    D.
    none of the above

  15. As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is

  16. A.
    14.85
    B.
    220
    C.
    78
    D.
    3.85

  17. Which one of the following statements regarding DSI is wrong?

  18. A.
    It is a digital form of TASI
    B.
    Though it is more efficient than TASI, it is much slower
    C.
    A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel
    D.
    It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality

  19. Which one of the following statements regarding compandor is FALSE?

  20. A.
    It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
    B.
    It gives preferential treatment to the weaker parts of the signal
    C.
    For weaker signals it gives a poor ratio of signal strength to quantizing error
    D.
    Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced.