Discussion
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- Question
The degradation of satellite solar cells with time is mainly due to
Options- A. their bombardment by electrons
- B. collection of meteoric dust
- C. increase in resistivity of silicon
- D. gradual leakage of charge carriers from the semiconductor material
- Correct Answer
- their bombardment by electrons
- 1. A typical signal strength received from a geosynchronous communication satellite is of the order of a few
Options- A. milliwatts
- B. kilowatts
- C. picowatts
- D. watts Discuss
- 2. The distance of a synchronous satellite from Earth's surface is __________ km.
Options- A. 300
- B. 10000
- C. 35900
- D. 5 Discuss
- 3. The echo heard by a telephone user on a satellite channel can be removed by using
Options- A. a vocoder
- B. a multiplexer
- C. echo suppressor
- D. digital techniques Discuss
- 4. Which of the following statement regarding link loss for a satellite is wrong?
Options- A. For fixed antenna, it is inversely proportional to f2
- B. For fixed frequency, it is inversely proportional to the product of the antenna aperture areas
- C. For a given satellite operating at a given frequency, it is inversely proportional to
- D. Loss in down-link is negligible as compared to that in uplink Discuss
- 5. In envelope detection of an AM waveform
Options- A. One side band and full-ampiitude carrier are needed
- B. Both side bands and full-amplitude carrier are needed
- C. Only two side bands are needed
- D. Upper side band and part of carrier are needed Discuss
- 6. The life time of a geosynchronous communication
Options- A. 5
- B. 10
- C. 20
- D. 50 Discuss
- 7. Shannon's Law relates
Options- A. antenna gain to frequency
- B. noise power to bandwidth
- C. information-carrying capacity to S/N ratio
- D. transmission losses to noise Discuss
- 8. In selecting a satellite system, the First determining factor is its
Options- A. EIRP
- B. antenna size
- C. coverage a sea
- D. antenna gain Discuss
- 9. The average noise temperature of Earth, as viewed from space, is __________ °K.
Options- A. 254
- B. 303
- C. 100
- D. 500 Discuss
- 10. The noise temperature of sky is about __________ °K.
Options- A. 100
- B. 273
- C. 0
- D. 30 Discuss
Satellite Communication problems
Search Results
Correct Answer: picowatts
Correct Answer: 35900
Correct Answer: echo suppressor
Correct Answer: Loss in down-link is negligible as compared to that in uplink
Correct Answer: Both side bands and full-amplitude carrier are needed
Correct Answer: 10
Correct Answer: noise power to bandwidth
Correct Answer: coverage a sea
Correct Answer: 254
Correct Answer: 30
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