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Satellite Communication
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Most of the communication satellites are stationed to the West of their service areas in order to reduce their
mass of station-keeping fuel
eclipse period
battery power provision
loss of power
Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h
22800
36000
11200
Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful
INSAT-ID
INSAT-IC
INSAT-IA
INSAT-IB
While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced byhalf.
To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of
16
2
8
4
The number of days when Earth's shadow falls on a geosynchronous satellite is
88
10
277
5
A geosynchronous satellite
has all of the above
rotates in the equatorial plane
has a circular orbit
has the same period a that of the Earth
In the context of error detection in satellite transmission, ARQ stands for
Automatic Repeat Request
Automatic Relay Request
Accelerated Recovery Request
Automatic Radiation Quenching
The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means
Demand-Assigned Multiple Access
Digital Analog Master Antenna
Dynamically-Assigned Multiple Access
Decibel Attenuated Microwave Access
The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree
0.1
2.0
1.0
0.5
For satellite transmission, analog signals may be converted into digital form with the help of
Transponder
Codec
compandor
Modem
The most effective anti jamming technique is
once-only key
spread-spectrum modulation
frequency hopping
key leverage
A communication satellite is a repeater between
many transmitting station and many receiving station
None
a transmitting station and a receiving station
a transmitting station and many receiving station
Master control facility (MCF) for INSAT-2 series satellites is located at
Hassan
New Delhi
Madras
Leh
A 20 m antenna gives a certain uplink gain at frequencies of 4/6GHz.
For getting same gain in the 20/30 GHz band, antenna size required is metre
4
100
1
10
A typical error rate on satellite circuits is one bit error in
1010
103
107
102
Depending on the technique used, digitized television requires a bit rate between __________ millions
40 and 92.5
30 and 82.5
2
25 and 60
In a stop-and-wait ARQ system, the transmitting terminal
resends the previous block if negative acknowledgement is received through a NAK character
sends another block if positive acknowledge is received through ACK character
does not wait for acknowledgement after sending a block
waits for positive or negative acknowled-gement from the receiving terminal after sending a block
As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is
3.85
14.85
220
78
Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr
15000
11100
36000
28000
The expression for satellite link frequencies such as 4/6 GHz denotes that
the system operates at a mean frequency of 5 GHz
4 GHz is the up-link and 6 GHz is the down-link frequency
4 GHz is the down-link and 6 GHz is the up-link frequency
one frequency is used as a back up for the other
In envelope detection of an AM waveform
Only two side bands are needed
One side band and full-ampiitude carrier are needed
Both side bands and full-amplitude carrier are needed
Upper side band and part of carrier are needed
A typical signal strength received from a geosynchronous communication satellite is of the order of a few
picowatts
kilowatts
watts
milliwatts
A few minutes disturbance in space communications occurs twice a year during Sunblinding when __________ are in line
Sun, satellite and Earth station
Sun and Earth station
Sun and satellite
Satellite and Earth station
India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
USA
up
UK
USSR
Satellite launch sites are invariably located on Eastern seaboards to ensure that
the satellite achieves circular orbit quickly
launch takes place eastward
expenditure of propulsion fuel is reduced during plane changing
spent rocket motor and other launcher debris falls into the sea
The distance of a synchronous satellite from Earth's surface is __________ km
5
300
35900
10000
The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's
both (b) and (c)
domestic communications
meteorological capability
intelligence gathering capacity
The average noise temperature of Earth, as viewed from space, is __________ °K
100
254
303
500
When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K
170
243
123
273
A geostationary satellite is one which
hangs motionless in space about 36000 km about Earth
travels around the Earth in 24 hours
appears stationary to everybody on Earth
remains stationary above the Earth
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