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ECE :: Satellite Communication

  1. In synchronous detection of an AM signal

  2. A.
    Carrier is completely suppressed
    B.
    Both side hands are suppressed
    C.
    Only one side band and part of carrier is suppressed
    D.
    One side band and full carrier is suppressed

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  3. A typical signal strength received from a geosynchronous communication satellite is of the order of a few

  4. A.
    milliwatts
    B.
    kilowatts
    C.
    picowatts
    D.
    watts

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  5. The expression for satellite link frequencies such as 4/6 GHz denotes that

  6. A.
    4 GHz is the up-link and 6 GHz is the down-link frequency
    B.
    4 GHz is the down-link and 6 GHz is the up-link frequency
    C.
    the system operates at a mean frequency of 5 GHz
    D.
    one frequency is used as a back up for the other

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  7. Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.

  8. A.
    30.3
    B.
    42.4
    C.
    50
    D.
    25

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  9. Mark out the WRONG statement.
    As compared to FDMA, the demand assignment system TDMA

  10. A.
    Needs very high-speed burst modems
    B.
    Faces no problems caused by intermodulation of carriers so that transponder can be used at its full power
    C.
    Needs high-speed manipulation of bit streams
    D.
    Is less flexible so that channels of widely different capacities cannot used and intermixed

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  11. APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from

  12. A.
    Cape Canaveral in Florida
    B.
    Kourou in French Guyana
    C.
    Canarvon in Western Australia
    D.
    Bangalore in South India

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  13. A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.

  14. A.
    100
    B.
    270
    C.
    470
    D.
    540

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  15. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it

  16. A.
    offers a much wider available bandwidth
    B.
    does not suffer from atmospheric at tenuation
    C.
    permits the use of smaller antenna
    D.
    does not suffer from rain attenuation

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  17. Which of the following statement regarding link loss for a satellite is wrong?

  18. A.
    For fixed antenna, it is inversely proportional to f2
    B.
    For fixed frequency, it is inversely proportional to the product of the antenna aperture areas
    C.
    For a given satellite operating at a given frequency, it is inversely proportional to
    D.
    Loss in down-link is negligible as compared to that in uplink

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  19. Depending on the technique used, digitized television requires a bit rate between __________ millions.

  20. A.
    40 and 92.5
    B.
    25 and 60
    C.
    30 and 82.5
    D.
    2

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