Discussion
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- Question
Low-orbit satellites are not used for communications because they
Options- A. produce sonic booms
- B. do not provide 24 hour/ day contact to the users on Earth
- C. heat up and melt
- D. none
- Correct Answer
- heat up and melt
- 1. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
Options- A. facilitate tracking
- B. allow permit adequate frequency coverage without switching
- C. facilitate image frequency rejection
- D. all of the above Discuss
- 2. The purpose of incorporating a pre-selector stage in a receiver is to
Options- A. provide higher selectivity
- B. provide higher fidelity
- C. improve linearity
- D. larger passband Discuss
- 3. In a FM waveform, the side bands are spaced at intervals equal to
Options- A. four times the modulating frequency
- B. twice the modulating frequency
- C. half the modulating frequency
- D. modulating frequency Discuss
- 4. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of
Options- A. Mf
- B. Mf/2
- C. 2Mf
- D. UMf Discuss
- 5. Power spectral density of white noise
Options- A. is constant with frequency
- B. increases with frequency
- C. decreases with frequency
- D. none Discuss
- 6. In synchronous detection of an AM signal
Options- A. Carrier is completely suppressed
- B. Both side hands are suppressed
- C. Only one side band and part of carrier is suppressed
- D. One side band and full carrier is suppressed Discuss
- 7. The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.
Options- A. 12
- B. 20
- C. 5
- D. 36 Discuss
- 8. India's first three-axis stabilised geostationary communication satellite is
Options- A. Rohini
- B. Aryabhatta
- C. Apple
- D. Bhaskara Discuss
- 9. After the death of INSAT-IB, the mainstay of the entire Indian satellite network for some time to come would be
Options- A. INSTELSAT-V
- B. INSAT-ID
- C. INSAT-2
- D. ARABSAT Discuss
- 10. The traffic-handling capacity of an Earth station on the uplink depends on
Options- A. its EIRP
- B. satellite antenna gain
- C. noise associated with the satellite
- D. all of the above Discuss
Satellite Communication problems
Search Results
Correct Answer: allow permit adequate frequency coverage without switching
Correct Answer: provide higher selectivity
Correct Answer: half the modulating frequency
Correct Answer: 2Mf
Correct Answer: is constant with frequency
Correct Answer: Only one side band and part of carrier is suppressed
Correct Answer: 5
Correct Answer: Apple
Correct Answer: ARABSAT
Correct Answer: all of the above
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