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- Question
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
- Correct Answer
- does not wait for acknowledgement after sending a block
- 1. 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
- 2. 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
- 3. 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
- 4. At present, the radio-frequency band mainly used by most satellites is
Options- A. EHF
- B. UHF
- C. VHF
- D. SHF Discuss
- 5. 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
- 6. The angle subtended by earth at geostationary communication satellite is
Options- A. 17.34°
- B. 51.4°
- C. 120°
- D. 60° Discuss
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. 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
Satellite Communication problems
Search Results
Correct Answer: gives a narrow beam shining into space
Correct Answer: The width of a beam in space is inversely proportional to the width of the transmitting antenna
Correct Answer: does all of the above-mentioned functions
Correct Answer: SHF
Correct Answer: 1000
Correct Answer: 17.34°
Correct Answer: 102° E longitude over Sumatra
Correct Answer: ARABSAT
Correct Answer: large bandwidth and severe noise
Correct Answer: 4
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