Discussion
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- Question
Noise temperature of Sun is more than __________ °K.
Options- A. 1000
- B. 5000
- C. 100000
- D. 500
- Correct Answer
- 100000
- 1. The number of days when Earth's shadow falls on a geosynchronous satellite is
Options- A. 88
- B. 277
- C. 5
- D. 10 Discuss
- 2. The most effective anti jamming technique is
Options- A. frequency hopping
- B. spread-spectrum modulation
- C. key leverage
- D. once-only key Discuss
- 3. 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
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. At present, the radio-frequency band mainly used by most satellites is
Options- A. EHF
- B. UHF
- C. VHF
- D. SHF Discuss
Satellite Communication problems
Search Results
Correct Answer: 88
Correct Answer: spread-spectrum modulation
Correct Answer: 0.1
Correct Answer: 4
Correct Answer: 27.5 to 30
Correct Answer: 52 and 88
Correct Answer: 220
Correct Answer: (17.34/4.5)2
Correct Answer: 1000
Correct Answer: SHF
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