Satellite Communication problems
- 1. 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 Discuss
Correct Answer: At present 4/6 GHz geostationary satellites are being parked in geosynchronous, orbits at least 10° apart
- 2. 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
Correct Answer: Sun, satellite and Earth station
- 3. 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
Correct Answer: The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
- 4. 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
Correct Answer: 25
- 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
Correct Answer: Olympus-I
- 6. 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
Correct Answer: Is less flexible so that channels of widely different capacities cannot used and intermixed
- 7. 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
Correct Answer: avoid interference between its powerful transmitted signal and weak in coming signal
- 8. 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
Correct Answer: battery power provision
- 9. 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
Correct Answer: 4 GHz is the down-link and 6 GHz is the up-link frequency
- 10. 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
Correct Answer: direct the spot beam to a particular region of space on Earth
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