Discussion
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- Question
Which statement out of the following statement is wrong?
Options- A. Attenuation of satellite signals by rain and fog varies almost inversely with the angle of elevation
- B. At 12/4, GHz link frequencies, signal power loss due to rain and fog is much greater than at 4/6 GHz frequencies
- C. The distance between satellite and Earth station varies slightly with angle of elevation
- D. At present 4/6 GHz geostationary satellites are being parked in geosynchronous, orbits at least 10° apart
- Correct Answer
- At present 4/6 GHz geostationary satellites are being parked in geosynchronous, orbits at least 10° apart
- 1. Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.
Options- A. 28000
- B. 15000
- C. 36000
- D. 11100 Discuss
- 2. A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.
Options- A. 92000
- B. 920
- C. 23000
- D. 230 Discuss
- 3. Geosynchronous satellites are always launched in the equatorial plane because it is the only plane which provides
Options- A. 24-hour orbit
- B. stationary satellite
- C. global communication
- D. zero-gravity environs Discuss
- 4. A typical error rate on satellite circuits is one bit error in
Options- A. 107
- B. 103
- C. 102
- D. 1010 Discuss
- 5. The lowest frequency used in satellite communications is __________ GHz.
Options- A. 0.8
- B. 3
- C. 18
- D. 30 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Satellite Communication problems
Search Results
Correct Answer: 11100
Correct Answer: 92000
Correct Answer: global communication
Correct Answer: 107
Correct Answer: 0.8
Correct Answer: Sun, satellite and Earth station
Correct Answer: The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
Correct Answer: 25
Correct Answer: Olympus-I
Correct Answer: Is less flexible so that channels of widely different capacities cannot used and intermixed
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