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- Question
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
- Correct Answer
- large bandwidth and severe noise
- 1. The ending part of the popular teleserial Mahabharat will be beamed to the viewers
Options- A. WESTAT
- B. INSAT-IC
- C. ARABSAT
- D. INSAT-ID Discuss
- 2. The geostationary communication satellite APPLE is parked in the equatorial orbit at
Options- A. 102° E longitude over Sumatra
- B. 90° E longitude over Bangladesh
- C. 74° E longitude over India
- D. 67° E longitude over Pakistan Discuss
- 3. The angle subtended by earth at geostationary communication satellite is
Options- A. 17.34°
- B. 51.4°
- C. 120°
- D. 60° Discuss
- 4. In a stop-and-wait ARQ system, the transmitting terminal
Options- A. waits for positive or negative acknowled-gement from the receiving terminal after sending a block
- B. sends another block if positive acknowledge is received through ACK character
- C. resends the previous block if negative acknowledgement is received through a NAK character
- D. does not wait for acknowledgement after sending a block Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. The first geostationary satellite launched in 1965 was called
Options- A. ANIK
- B. EARLY BIRD (Intelsat-I)
- C. WESTAR
- D. MOLNIYA Discuss
- 9. 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
- 10. 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
Satellite Communication problems
Search Results
Correct Answer: ARABSAT
Correct Answer: 102° E longitude over Sumatra
Correct Answer: 17.34°
Correct Answer: does not wait for acknowledgement after sending a block
Correct Answer: gives a narrow beam shining into space
Correct Answer: 4
Correct Answer: 10 minutes on 5 consecutive days
Correct Answer: EARLY BIRD (Intelsat-I)
Correct Answer: For weaker signals it gives a poor ratio of signal strength to quantizing error
Correct Answer: INSAT-IB
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