Satellite Communication problems
- 1. In satellite communication, frequency modulation is used because satellite channel has
Options- A. small bandwidth and negligible noise
- B. large bandwidth and severe noise
- C. maximum bandwidth and minimum noise
- D. high modulation index Discuss
Correct Answer: large bandwidth and severe noise
- 2. While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of
Options- A. 2
- B. 4
- C. 8
- D. 16 Discuss
Correct Answer: 4
- 3. The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about
Options- A. 10 minutes on 5 consecutive days
- B. 5 minutes on 10 consecutive days
- C. 30 minutes for 5 consecutive days
- D. one hour for 5 consecutive days Discuss
Correct Answer: 10 minutes on 5 consecutive days
- 4. The first geostationary satellite launched in 1965 was called
Options- A. ANIK
- B. EARLY BIRD (Intelsat-I)
- C. WESTAR
- D. MOLNIYA Discuss
Correct Answer: EARLY BIRD (Intelsat-I)
- 5. Which one of the following statements regarding compandor is FALSE?
Options- A. It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
- B. It gives preferential treatment to the weaker parts of the signal
- C. For weaker signals it gives a poor ratio of signal strength to quantizing error
- D. Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced. Discuss
Correct Answer: For weaker signals it gives a poor ratio of signal strength to quantizing error
- 6. Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.
Options- A. INSAT-IA
- B. INSAT-IB
- C. INSAT-IC
- D. INSAT-ID Discuss
Correct Answer: INSAT-IB
- 7. Rotation of a geosynchronous satellite means its
Options- A. drift from stationary position
- B. wobbling
- C. three-axis stabilization
- D. three-dimensional stabilization Discuss
Correct Answer: wobbling
- 8. A geostationary satellite is one which
Options- A. hangs motionless in space about 36000 km about Earth
- B. travels around the Earth in 24 hours
- C. remains stationary above the Earth
- D. appears stationary to everybody on Earth Discuss
Correct Answer: appears stationary to everybody on Earth
- 9. India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
Options- A. USSR
- B. USA
- C. UK
- D. UP Discuss
Correct Answer: USA
- 10. Radio broadcasting is a familiar example of
Options- A. space multiplexing
- B. time multiplexing
- C. frequency multiplexing
- D. none of the above Discuss
Correct Answer: frequency multiplexing
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