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Home ‣ Electronics and Communication Engineering ‣ Satellite Communication Comments
  • Question

  • A satellite link uses different frequencies for receiving and transmitting in order to


  • Options
  • A. avoid interference from terrestrial microwave links
  • B. avoid interference between its powerful transmitted signal and weak in coming signal
  • C. minimise free-space losses
  • D. maximise antenna gain

  • Correct Answer
  • avoid interference between its powerful transmitted signal and weak in coming signal 

    • Satellite Communication problems

    Search Results

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

    • Options
    • 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
      • Discuss
    • 2. Presently, the worlds's largest and most advanced multi-purpose communication satellite is

    • Options
    • A. INSAT-2
    • B. Intelsat-V
    • C. INSAT-ID
    • D. Olympus-I
      • Discuss
    • 3. Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.

    • Options
    • A. 30.3
    • B. 42.4
    • C. 50
    • D. 25
      • Discuss
    • 4. Regarding TASI which one of the following statements is wrong?

    • Options
    • A. It snatches the channel in his speech and may allocate it to another speaker needing it.
    • B. The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
    • C. It increases the overall utilization of the transmission channel
    • D. Intercontinental callers sometimes confuse the effects of TASI with the effects of satellite delay.
      • Discuss
    • 5. A few minutes disturbance in space communications occurs twice a year during Sunblinding when __________ are in line.

    • Options
    • A. Sun and satellite
    • B. Sun and Earth station
    • C. Satellite and Earth station
    • D. Sun, satellite and Earth station
      • Discuss
    • 6. Most of the communication satellites are stationed to the West of their service areas in order to reduce their

    • Options
    • A. eclipse period
    • B. loss of power
    • C. battery power provision
    • D. mass of station-keeping fuel
      • Discuss
    • 7. The expression for satellite link frequencies such as 4/6 GHz denotes that

    • Options
    • 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
      • Discuss
    • 8. In satellite communication, highly directional antennas are used to

    • Options
    • A. direct the spot beam to a particular region of space on Earth
    • B. strengthen the beam to overcome the cosmic noise
    • C. make corrections in change of polarisation of the beam
    • D. select a particular channel in transmission and reception
      • Discuss
    • 9. India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.

    • Options
    • A. geostationary
    • B. equatorial
    • C. polar
    • D. sun-synchronous polar
      • Discuss
    • 10. Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h.

    • Options
    • A. 11200
    • B. 0
    • C. 36000
    • D. 22800
      • Discuss

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