Discussion
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- Question
A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.
Options- A. 100
- B. 4
- C. 1
- D. 10
- Correct Answer
- 4
- 1. For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.
Options- A. 27.5 to 30
- B. 10 to 15
- C. 30 to 50
- D. 5 to 10 Discuss
- 2. Orbital disturbances of a geosynchronous satellite are caused by the
Options- A. moon
- B. sun
- C. earth
- D. all of the above Discuss
- 3. The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means
Options- A. Demand-Assigned Multiple Access
- B. Decibel Attenuated Microwave Access
- C. Digital Analog Master Antenna
- D. Dynamically-Assigned Multiple Access Discuss
- 4. Which one of the following statements regarding DSI is wrong?
Options- A. It is a digital form of TASI
- B. Though it is more efficient than TASI, it is much slower
- C. A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel
- D. It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality Discuss
- 5. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?
Options- A. Pressure of solar radiations
- B. Gravitational changes due to Sun and Moon
- C. Oblateness of the Earth
- D. Weight of the satellite Discuss
- 6. The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.
Options- A. 0.1
- B. 1.0
- C. 2.0
- D. 0.5 Discuss
- 7. The most effective anti jamming technique is
Options- A. frequency hopping
- B. spread-spectrum modulation
- C. key leverage
- D. once-only key Discuss
- 8. The number of days when Earth's shadow falls on a geosynchronous satellite is
Options- A. 88
- B. 277
- C. 5
- D. 10 Discuss
- 9. Noise temperature of Sun is more than __________ °K.
Options- A. 1000
- B. 5000
- C. 100000
- D. 500 Discuss
- 10. In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.
Options- A. 34 and 106
- B. 52 and 88
- C. 106 and 142
- D. 34 and 142 Discuss
Satellite Communication problems
Search Results
Correct Answer: 27.5 to 30
Correct Answer: all of the above
Correct Answer: Demand-Assigned Multiple Access
Correct Answer: Though it is more efficient than TASI, it is much slower
Correct Answer: Weight of the satellite
Correct Answer: 0.1
Correct Answer: spread-spectrum modulation
Correct Answer: 88
Correct Answer: 100000
Correct Answer: 52 and 88
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