Discussion
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- Question
The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of
Options- A. 17.34/4.5
- B. 17.34 x 4.5
- C. (17.34/4.5)2
- D. (17.34/4.5)4
- Correct Answer
- (17.34/4.5)2
- 1. As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is
Options- A. 14.85
- B. 220
- C. 78
- D. 3.85 Discuss
- 2. 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
- 3. Noise temperature of Sun is more than __________ °K.
Options- A. 1000
- B. 5000
- C. 100000
- D. 500 Discuss
- 4. The number of days when Earth's shadow falls on a geosynchronous satellite is
Options- A. 88
- B. 277
- C. 5
- D. 10 Discuss
- 5. The most effective anti jamming technique is
Options- A. frequency hopping
- B. spread-spectrum modulation
- C. key leverage
- D. once-only key Discuss
- 6. Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt.
Options- A. 100
- B. 500
- C. 2000
- D. 1000 Discuss
- 7. At present, the radio-frequency band mainly used by most satellites is
Options- A. EHF
- B. UHF
- C. VHF
- D. SHF Discuss
- 8. A transponder is a satellite equipment which
Options- A. receives a signal from Earth station and amplifies
- B. changes the frequency of the received signal
- C. retransmits the received signal
- D. does all of the above-mentioned functions Discuss
- 9. Which one of the following statement is correct?
Options- A. Satellite spacing is not affected by the bandwidth of the transmitting earth station
- B. Beamwidth is independent of antenna size and frequency band used
- C. The width of a beam in space is inversely proportional to the width of the transmitting antenna
- D. Use of high-frequency bands permits less number of satellites to share the orbit Discuss
- 10. In communication satellites, the up-link normally operates at a higher frequency than the down-link because it
Options- A. gives a narrow beam shining into space
- B. results in lesser signal attenuation
- C. gives better beam-shaping
- D. is easier to polarize a high frequency beam Discuss
Satellite Communication problems
Search Results
Correct Answer: 220
Correct Answer: 52 and 88
Correct Answer: 100000
Correct Answer: 88
Correct Answer: spread-spectrum modulation
Correct Answer: 1000
Correct Answer: SHF
Correct Answer: does all of the above-mentioned functions
Correct Answer: The width of a beam in space is inversely proportional to the width of the transmitting antenna
Correct Answer: gives a narrow beam shining into space
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