logo

CuriousTab

CuriousTab

Discussion

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

  • 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

  • Correct Answer
  • sun-synchronous polar 

    • Satellite Communication problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
      • Discuss
    • 5. 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
    • 6. 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
    • 7. Phase modulation is commonly-used for data transmission mainly because

    • Options
    • A. phase can be varied from + 180° to 180°
    • B. it is resistant to the effects of noise
    • C. demodulation is very easy
    • D. it gives highest data rates that can be transmitted over a given channel
      • Discuss
    • 8. When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.

    • Options
    • A. 273
    • B. 243
    • C. 170
    • D. 123
      • Discuss
    • 9. Point out the false statement.
      Launching of geostationary experimental communication satellite has helped India to gain experience in

    • Options
    • A. Building, for the time, a body-stabilized geosynchronous communication satellite with its own apogee propulsion and control systems
    • B. Attitude control and station management operations for a geostationary satellite
    • C. Building launching rocket Ariane for putting APPLE in orbit
    • D. Domestic communications on an experimental basis
      • Discuss
    • 10. APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from

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

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.