Satellite Communication C. Digital Analog Master Antenna C. its effective isotropic radiated power (EIRP) must
be increased
1. The first geostationary satellite launched in 1965 D. Dynamically-Assigned Multiple Access
was called D. its footprint must be increased
7. The angle subtended by earth at geostationary
A. ANIK communication satellite is 12. India's first domestic geostationary satellite
1NSAT-IA was launched on 10th April 1982 from
B. EARLY BIRD (Intelsat-I) A. 17.34° B. 51.4°
A. USSR B. USA
C. WESTAR C. 120° D. 60°
C. UK D. UP
D. MOLNIYA 8. The INTELSAT-IV satellite launched in 1974 had
two earth coverage antenna and two narrower- 13. Satellite launch sites are invariably located on
2. Rotation of a geosynchronous satellite means its angle antennas subtending 4.5°. The signal from Eastern seaboards to ensure that
A. drift from stationary position narrow-angle antenna was stronger than that from
A. launch takes place eastward
earth- coverage antenna by a factor of
B. wobbling B. expenditure of propulsion fuel is reduced during
A. 17.34/4.5 B. 17.34 x 4.5
C. three-axis stabilization plane changing
C. (17.34/4.5)^2 D. (17.34/4.5)^4
C. the satellite achieves circular orbit quickly
D. three-dimensional stabilization
9. A transponder is a satellite equipment which
3. The present total cost per watt of power D. spent rocket motor and other launcher debris
A. receives a signal from Earth station and amplifies falls into the sea
generation in geosynchronous orbit is nearly Rs.
A. 20 B. 50 C. 100 D. 5 B. changes the frequency of the received signal 14. The owner of a communication satellite is
usually required to keep the spacecraft on station at
C. retransmits the received signal
4. Noise temperature of Sun is more than its assigned place in the geosynchronous orbit with
__________ °K. D. does all of the above-mentioned functions an accuracy of __________ degree.
A. 1000 B. 5000 10. A geosynchronous satellite A. 0.1 B. 1.0 C. 2.0 D. 0.5
C. 100000 D. 500 A. has the same period a that of the Earth 15. The number of days when Earth's shadow falls
on a geosynchronous satellite is
5. A 20 m antenna gives a certain uplink gain at B. has a circular orbit
frequencies of 4/6 GHz. For getting same gain in the A. 88 B. 277 C. 5 D. 10
20/30 GHz band, antenna size required is metre. C. rotates in the equatorial plane
16. Of the four INSAT-I satellites planned by India
A. 100 B. 4 C. 1 D. 10 D. has all of the above so for, only __________ has proved to be
11. To make antenna more directional, either its successful.
6. The discussing sharing of a communication
satellite by many geographically dispersed Earth size must be increased or A. INSAT-IA B. INSAT-IB
station, DAMA means A. the number of its feed horns must be increased C. INSAT-IC D. INSAT-ID
A. Demand-Assigned Multiple Access B. the frequency of its transmission must be
B. Decibel Attenuated Microwave Access increased
, 17. Radio broadcasting is a familiar example of D. Weaker signals, traverse more quantum steps 26. In a stop-and-wait ARQ system, the
than they would do otherwise and so quantizing transmitting terminal
A. space multiplexing
error is reduced.
A. waits for positive or negative acknowled-gement
B. time multiplexing
21. The quality of a space-link is measured in terms from the receiving terminal after sending a block
C. frequency multiplexing of the __________ ratio.
B. sends another block if positive acknowledge is
D. none of the above A. C/N B. S/N received through ACK character
18. As compared to 17.34° antenna, the total C. G/T D. EIRP C. resends the previous block if negative
increase in the signal relayed by 4.5° antenna of acknowledgement is received through a NAK
22. The useful operational life of INSAT-IB
INTELSAT-IV is character
(launched in 1983) is expected to end by
A. 14.85 B. 220 D. does not wait for acknowledgement after
A. 1992-93 B. 1991-92
sending a block
C. 78 D. 3.85
C. 1989-90 D. 1993-94
27. A geostationary satellite is one which
19. Which one of the following statements
23. At present, the radio-frequency band mainly
regarding DSI is wrong? A. hangs motionless in space about 36000 km about
used by most satellites is
Earth
A. It is a digital form of TASI
A. EHF B. UHF
B. travels around the Earth in 24 hours
B. Though it is more efficient than TASI, it is much
C. VHF D. SHF
slower C. remains stationary above the Earth
24. Orbital disturbances of a geosynchronous
C. A speaker has to wait (it at all) for only a few D. appears stationary to everybody on Earth
satellite are caused by the
milliseconds for reallocation of channel
28. The geostationary communication satellite
A. moon B. sun
D. It has increased the capacity of satellite channels APPLE is parked in the equatorial orbit at
by a factor of 2.2 or more without degrading speech C. earth D. all of the above
A. 102° E longitude over Sumatra
quality
25. Which one of the following statement is
B. 90° E longitude over Bangladesh
20. Which one of the following statements correct?
regarding compandor is FALSE? C. 74° E longitude over India
A. Satellite spacing is not affected by the bandwidth
A. It compresses the higher-amplitude parts of a of the transmitting earth station D. 67° E longitude over Pakistan
signal before modulation and expands them back to
B. Beamwidth is independent of antenna size and 29. Power received from Sun per m2 surface area
normal again after demodulation.
frequency band used of a geosynchronous satellite in nearly __________
B. It gives preferential treatment to the weaker watt.
C. The width of a beam in space is inversely
parts of the signal
proportional to the width of the transmitting A. 100 B. 500 C. 2000 D. 1000
C. For weaker signals it gives a poor ratio of signal antenna
strength to quantizing error
D. Use of high-frequency bands permits less
number of satellites to share the orbit
be increased
1. The first geostationary satellite launched in 1965 D. Dynamically-Assigned Multiple Access
was called D. its footprint must be increased
7. The angle subtended by earth at geostationary
A. ANIK communication satellite is 12. India's first domestic geostationary satellite
1NSAT-IA was launched on 10th April 1982 from
B. EARLY BIRD (Intelsat-I) A. 17.34° B. 51.4°
A. USSR B. USA
C. WESTAR C. 120° D. 60°
C. UK D. UP
D. MOLNIYA 8. The INTELSAT-IV satellite launched in 1974 had
two earth coverage antenna and two narrower- 13. Satellite launch sites are invariably located on
2. Rotation of a geosynchronous satellite means its angle antennas subtending 4.5°. The signal from Eastern seaboards to ensure that
A. drift from stationary position narrow-angle antenna was stronger than that from
A. launch takes place eastward
earth- coverage antenna by a factor of
B. wobbling B. expenditure of propulsion fuel is reduced during
A. 17.34/4.5 B. 17.34 x 4.5
C. three-axis stabilization plane changing
C. (17.34/4.5)^2 D. (17.34/4.5)^4
C. the satellite achieves circular orbit quickly
D. three-dimensional stabilization
9. A transponder is a satellite equipment which
3. The present total cost per watt of power D. spent rocket motor and other launcher debris
A. receives a signal from Earth station and amplifies falls into the sea
generation in geosynchronous orbit is nearly Rs.
A. 20 B. 50 C. 100 D. 5 B. changes the frequency of the received signal 14. The owner of a communication satellite is
usually required to keep the spacecraft on station at
C. retransmits the received signal
4. Noise temperature of Sun is more than its assigned place in the geosynchronous orbit with
__________ °K. D. does all of the above-mentioned functions an accuracy of __________ degree.
A. 1000 B. 5000 10. A geosynchronous satellite A. 0.1 B. 1.0 C. 2.0 D. 0.5
C. 100000 D. 500 A. has the same period a that of the Earth 15. The number of days when Earth's shadow falls
on a geosynchronous satellite is
5. A 20 m antenna gives a certain uplink gain at B. has a circular orbit
frequencies of 4/6 GHz. For getting same gain in the A. 88 B. 277 C. 5 D. 10
20/30 GHz band, antenna size required is metre. C. rotates in the equatorial plane
16. Of the four INSAT-I satellites planned by India
A. 100 B. 4 C. 1 D. 10 D. has all of the above so for, only __________ has proved to be
11. To make antenna more directional, either its successful.
6. The discussing sharing of a communication
satellite by many geographically dispersed Earth size must be increased or A. INSAT-IA B. INSAT-IB
station, DAMA means A. the number of its feed horns must be increased C. INSAT-IC D. INSAT-ID
A. Demand-Assigned Multiple Access B. the frequency of its transmission must be
B. Decibel Attenuated Microwave Access increased
, 17. Radio broadcasting is a familiar example of D. Weaker signals, traverse more quantum steps 26. In a stop-and-wait ARQ system, the
than they would do otherwise and so quantizing transmitting terminal
A. space multiplexing
error is reduced.
A. waits for positive or negative acknowled-gement
B. time multiplexing
21. The quality of a space-link is measured in terms from the receiving terminal after sending a block
C. frequency multiplexing of the __________ ratio.
B. sends another block if positive acknowledge is
D. none of the above A. C/N B. S/N received through ACK character
18. As compared to 17.34° antenna, the total C. G/T D. EIRP C. resends the previous block if negative
increase in the signal relayed by 4.5° antenna of acknowledgement is received through a NAK
22. The useful operational life of INSAT-IB
INTELSAT-IV is character
(launched in 1983) is expected to end by
A. 14.85 B. 220 D. does not wait for acknowledgement after
A. 1992-93 B. 1991-92
sending a block
C. 78 D. 3.85
C. 1989-90 D. 1993-94
27. A geostationary satellite is one which
19. Which one of the following statements
23. At present, the radio-frequency band mainly
regarding DSI is wrong? A. hangs motionless in space about 36000 km about
used by most satellites is
Earth
A. It is a digital form of TASI
A. EHF B. UHF
B. travels around the Earth in 24 hours
B. Though it is more efficient than TASI, it is much
C. VHF D. SHF
slower C. remains stationary above the Earth
24. Orbital disturbances of a geosynchronous
C. A speaker has to wait (it at all) for only a few D. appears stationary to everybody on Earth
satellite are caused by the
milliseconds for reallocation of channel
28. The geostationary communication satellite
A. moon B. sun
D. It has increased the capacity of satellite channels APPLE is parked in the equatorial orbit at
by a factor of 2.2 or more without degrading speech C. earth D. all of the above
A. 102° E longitude over Sumatra
quality
25. Which one of the following statement is
B. 90° E longitude over Bangladesh
20. Which one of the following statements correct?
regarding compandor is FALSE? C. 74° E longitude over India
A. Satellite spacing is not affected by the bandwidth
A. It compresses the higher-amplitude parts of a of the transmitting earth station D. 67° E longitude over Pakistan
signal before modulation and expands them back to
B. Beamwidth is independent of antenna size and 29. Power received from Sun per m2 surface area
normal again after demodulation.
frequency band used of a geosynchronous satellite in nearly __________
B. It gives preferential treatment to the weaker watt.
C. The width of a beam in space is inversely
parts of the signal
proportional to the width of the transmitting A. 100 B. 500 C. 2000 D. 1000
C. For weaker signals it gives a poor ratio of signal antenna
strength to quantizing error
D. Use of high-frequency bands permits less
number of satellites to share the orbit
