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- Question
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
- Correct Answer
- direct the spot beam to a particular region of space on Earth
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Satellite Communication problems
Search Results
Correct Answer: 4 GHz is the down-link and 6 GHz is the up-link frequency
Correct Answer: battery power provision
Correct Answer: avoid interference between its powerful transmitted signal and weak in coming signal
Correct Answer: Is less flexible so that channels of widely different capacities cannot used and intermixed
Correct Answer: Olympus-I
Correct Answer: sun-synchronous polar
Correct Answer: 11200
Correct Answer: it is resistant to the effects of noise
Correct Answer: 123
Correct Answer: Building launching rocket Ariane for putting APPLE in orbit
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