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1594 practice sets · Page 14 of 80
Define Polar-orbiting Satellites.
Polar orbiting Satellites orbit the earth in such a way as to cover the north & south Polar Regions.
Orbiting Satellites orbit the earth in such a way as to cover the east & west Polar Regions
Either (a) & (b)
None of the above
A communication satellite is a repeater between
one transmitting and one receiving station
one transmitting and many receiving station
many transmitting and one receiving station
many transmitting and many receiving station
Transmission bandwidth for satellite system least depends on
Modulation method
Overall costs
Available technology
Ionospheric characteristics
A certain sound has 1000 times more eneergy then another sound. The number of times it would sound stronger to a listener will be
1000
100
30
3
Satellite recieves signal from
Microwave repeater stations
TV relay station
Appropriate earth station
All of the above
In TV broadcast via satellite the TV signal from the main broadcast station is routed to the earth station via
Low power transmitters
Microwave links
TV relay stations
microwave repeater stations
The main advantage of satelliite comminication is
Low cost
Low distortion
High reliability
High band width
With reference to satellite communication, the anti-jamming technique preferred is
key leverage
Frequency hopping
Once-only key
Frequency-spectrum modulation
Define frame efficiency.
It is a measure of the fraction of frame time used for the transmission of Traffic
It is a measure of the fraction of information time used for the transmission of Traffic.
a&b
None of above
INTELSAT stands?
International Telecommunications Satellite
India Telecommunications Satellite
Inter Telecommunications Satellite
None of the above
Compander
Give a poor ratio of signal to duantizing error, for weaker signals
Give preferential treatment to stronger parts of the signal
Compresses the higher amplitude parts of a signal before modulation and expand them back to normal again after demodulation
None of the above
Which is the most commanly employed modulation technique in the commercial communication satellite system?
FM
Digital modulation
Analoge modulation
All of the above
The angle subtended by earth at a geostationary communication satellite is nearly
66.5
47.34
17.34
7.34
Which area is least effectively coverd by geostationary satellites?
Equatorial region
Polar region
A and C
None of the above
The carrier to noise ratio for a satellite depends upon
Effective Isotropic Radiated power
Bandwidth.
Free space path losses
All of them
DAMA stands for
Data accessibility master aerial
Digital attenuators microwave antenna
Dual accessibility mode antenna
Demand assigned multiple access
Satellite used for intercontinental communications are known as
COMAT
DOMSAT
INTELSAT
EARSAT
Geostationary satellite follow
Circular path
Elliptical path
Inclined path
Cycloidal path
Mention the different services of satellite systems.
Broadcasting satellite services
Signal transmission
Information transmission
None of the above
Shannons law relates
Frequency to antenna gain
Antenna gain to transmission losses
Information carring capacity to S/N ratio
Antenna gain to bandwidth
