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ECE :: Satellite Communication

  1. The first geostationary satellite launched in 1965 was called

  2. A.
    ANIK
    B.
    EARLY BIRD (Intelsat-I)
    C.
    WESTAR
    D.
    MOLNIYA

  3. Rotation of a geosynchronous satellite means its

  4. A.
    drift from stationary position
    B.
    wobbling
    C.
    three-axis stabilization
    D.
    three-dimensional stabilization

  5. The present total cost per watt of power generation in geosynchronous orbit is nearly Rs.

  6. A.
    20
    B.
    50
    C.
    100
    D.
    5

  7. Noise temperature of Sun is more than __________ °K.

  8. A.
    1000
    B.
    5000
    C.
    100000
    D.
    500

  9. A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.

  10. A.
    100
    B.
    4
    C.
    1
    D.
    10

  11. The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means

  12. A.
    Demand-Assigned Multiple Access
    B.
    Decibel Attenuated Microwave Access
    C.
    Digital Analog Master Antenna
    D.
    Dynamically-Assigned Multiple Access

  13. The angle subtended by earth at geostationary communication satellite is

  14. A.
    17.34°
    B.
    51.4°
    C.
    120°
    D.
    60°

  15. The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of

  16. A.
    17.34/4.5
    B.
    17.34 x 4.5
    C.
    (17.34/4.5)2
    D.
    (17.34/4.5)4

  17. A transponder is a satellite equipment which

  18. A.
    receives a signal from Earth station and amplifies
    B.
    changes the frequency of the received signal
    C.
    retransmits the received signal
    D.
    does all of the above-mentioned functions

  19. A geosynchronous satellite

  20. A.
    has the same period a that of the Earth
    B.
    has a circular orbit
    C.
    rotates in the equatorial plane
    D.
    has all of the above