Satellite Communication problems
- 1. 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
Correct Answer: (17.34/4.5)2
- 2. 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
Correct Answer: 1000
- 3. At present, the radio-frequency band mainly used by most satellites is
Options- A. EHF
- B. UHF
- C. VHF
- D. SHF Discuss
Correct Answer: SHF
- 4. 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
Correct Answer: does all of the above-mentioned functions
- 5. 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
Correct Answer: The width of a beam in space is inversely proportional to the width of the transmitting antenna
- 6. 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
Correct Answer: gives a narrow beam shining into space
- 7. 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
Correct Answer: does not wait for acknowledgement after sending a block
- 8. The angle subtended by earth at geostationary communication satellite is
Options- A. 17.34°
- B. 51.4°
- C. 120°
- D. 60° Discuss
Correct Answer: 17.34°
- 9. 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
Correct Answer: 102° E longitude over Sumatra
- 10. 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
Correct Answer: ARABSAT
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