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WorksheetsCS-Module 2 Satellite Communication
Total questions: 60
Worksheet time: 30mins
For long distance communication beyond 20MHz,the communication preferred is
Microwave Communication
Sky wave
Space wave
Satellite Communication
A device which changes the frequency band of the transmitted signal from the received one is
Satellite
Transponder
Both Satellite and transponder
None
The signal transmission frequency from first earth station to satellite is
Uplink frequency
Downlink frequency
Skip frequency
Free space frequency
The signal transmission frequency from satellite to second earth station
Uplink frequency
Downlink frequency
Skip frequency
Free space frequency
The stages in a satellite communication system is
Uplink--Transponder--Downlink
Downlink--Transponder--Uplink
Transponder--Uplink--Downlink
Transponder--Downlink--Uplink
In ______, each station is allocated a band to send its data. In other words, each band is reserved for a specific station, and it belongs to the station all the time.
TDMA
FDMA
CDMA
OFDMA
TDMA is a multiple access technique that has
Different users in different time slots
Each user is assigned unique frequency slot
Each user is assigned a unique code sequence
Each signal is modulated with frequency modulation technique
TDMA allows the user to have
Use of same frequency channel for same time slot
Use of same frequency channel for different time slot
Use of different time slot for different frequency channels
Use of different time slot for different frequency channels
GSM is an example of
CDMA cellular systems
TDMA cellular systems
FDMA cellular systems
SDMA cellular systems
Because of _______ transmissions in TDMA, the handoff process in __________
Continuous, complex
Continuous, simple
Discontinuous, complex
Discontinuous, simple
_________ synchronization overhead is required in TDMA due to _______ transmission.
High, burst
High, continuous
Low, burst
No, burst
A TDMA system uses 25 MHz for the forward link, which is broken into radio channels of 200 kHz. If 8 speech channels are supported on a single radio channel, how many simultaneous users can be accommodated?
25
200
1000
8
Cable television is an example of
CDMA
TDMA
FDMA
SDMA
Guard band is_________
The small unused bandwidth between the frequency channels to avoid interference
The bandwidth allotted to the signal
The channel spectrum
The spectrum acquired by the noise between the signal
Guard band is used in
CDMA and TDMA
FDMA and TDMA
FDMA and CDMA
None
FDMA is the division of _____________
Time
Phase
Spectrum
Amplitude
In FDMA,
1. Each user is assigned unique frequency slots
2. Demand assignment is possible
3. Fixed assignment is possible
4. It is vulnerable to timing problems
1 and 2 are correct
2 and 4 are correct
1,2 and 3 are correct
1,2,3,4 are correct
The image represents:
FDMA
CDMA
TDMA
OFDMA
The image represents:
FDMA
CDMA
TDMA
OFDMA
The image represents:
FDMA
CDMA
TDMA
OFDMA
A multiple access technique in which several transmitters can send information simultaneously over a single communication channel and allows users to share a band of frequencies
FDMA
CDMA
TDMA
None
Which of the following is a spread-spectrum multiple-access technique?
CDMA
FDMA
TDMA
All
Codeword is required in
TDMA
FDMA
CDMA
All
Which of the multiple access techniques have near-far problem?
TDMA
FDMA
CDMA
None
The gravitationally curved repeating trajectory of an satellite is called as
Directrix
Orbit
Apogee
Perigee
Among the given options which is the possible distance from earth to Low Earth Orbit (LEO) satellites?
500-1500km
5000-12500km
35800km
greater than 35800km
Which of the following types of satellite covers more area of earth surface?
LEO
MEO
GEO
All
NASA’s Earth Observing System fleet is in
LEO
MEO
GEO
HEO
The orbit preferred for navigation and specialty satellites is
LEO
MEO
GEO
HEO
Satellites in -------- orbit travel at a very high speed than other orbits
LEO
MEO
GEO
HEO
LEO satellites circle the Earth in
12 hrs
24hrs
6hrs
1.5hrs
Number of LEO satellites to cover the entire earth is
6
12
20
3
Among the given options which is the possible distance from earth to Medium Earth Orbit (MEO) satellites?
500-1500km
2000-35000km
35800km
greater than 35800km
MEO satellites circle the Earth in
12 hrs
24hrs
6hrs
1.5hrs
GEO satellites circle the Earth in
12 hrs
24hrs
6hrs
1.5hrs
Among the given options which is the possible distance from earth to GEO satellites?
500-1500km
2000-35000km
35800km
greater than 35800km
The term Geosynchronous satellite is so called because
The satellite travels in the same direction as the Earth rotates
The satellite travels in the same speed as the Earth rotates
The satellite travels in the same direction and in same speed as the Earth rotates
The satellite travels in the same direction ,but in different speed as the Earth rotates
Number of GEO satellites to cover the entire earth is
6
12
20
3
Which of the following are the subsystems of an earth station?
1. Transmitter
2. Receiver
3. Antenna
4. Tracking
1
1 and 2
1,2 and 3
1,2,3 and 4
The .............. subsystem of earth station radiates or receives electromagnetic waves
Transmitter
Receiver
Antenna
Tracking
The .............. subsystem of earth station keeps in touch with the satellite and make sure that the beam comes towards it in order to establish the communication
Transmitter
Receiver
Antenna
Tracking
The feed antenna in dish is usually a
Yagi-uda
Horn
Microstrip
Parabolic
95% of total power radiated by a dish antenna is in
Side lobes
Back lobe
Main lobe
None
An element in the outdoor unit of DTH system is:
RF amplifier
Low Noise Amplifier
Mixer
IF amplifier
An element in the indoor unit of DTH system is:
RF amplifier
Parabolic antenna
Low noise amplifier
Converter
Which of the following elements are required for DBS subscriber installation?
1.a dish antenna
2.a conventional TV set
3.a signal converter placed next to the TV set
4.a length of coaxial cable between the dish and the converter.
1
1 and 2
1,2 and 3
1,2,3 and 4
GIS stands for
Geographic Information System
Generic Information System
Geological Information System
Geographic Information Sharing
Use of GIS is necessary since it
1.Saves Times
2.Handle large datasets
3.Maps can be created and edited faster
1 and 2 are correct
1 and 3 are correct
2 and 3 are correct
1,2 and 3 are correct
Which of the following is not a use of a GIS?
Mapping
Store Prices
Network Services
Urban Planning
GPS is used for
Mapping
Resource Distribution
Navigation
Energy Tracking
What geographic tool uses at least four satellites to provide locations on the Earth?
globe
map
GMT
GPS
An example for GIS
Playstore
Google maps
Gmail
Cloud computing
GPS stand for
Global Points System
Going Positional Sensor
Global Positioning Sensor
Global Positioning System
Number of satellites in MEO required for a complete operational GPS space segment is
4
6
24
12
Number of satellites in a single GPS constellation is
4
6
24
12
The entity in GPS responsible for overall management of the remote monitoring and transmission sites is
Monitor Stations
User segment
Master Control System
Ground antennas
The entity in GPS responsible for reposition satellites to maintain an optimal constellation is
Monitor Stations
User segment
Master Control System
Ground antennas
The entity in GPS that checks the exact altitude, position, speed, and overall health of the orbiting satellites is
Monitor Stations
User segment
Master Control System
Ground antennas
At a time ................. number of satellites can be tracked by a monitoring station
4
6
12
11
The segment in GPS having one-way transmission is
Space segment
Control segment
User segment
None
