Font size
WorksheetsSatellite Communications
Total questions: 25
Worksheet time: 14mins
The transmitter-receiver combination in the satellite is known as a _______
Duplexer
Transponder
Repeater
Relay
The downlink frequency is lower than the uplink frequency.
True
False
Satellite signals are refracted by the ionosphere.
True
False
Which of the following is not a satellite subsystem?
Ground station
Power system
Telemetry tracking
Communication subsystem
Which of the following is not a part of the propulsion subsystem of a satellite?
Gyroscope
Jet thruster
AKM
Fuel control system
What is the number of transponders if the satellite uses 12 channels of frequency and frequency reuse is implemented?
12
24
Telemetry, command, and control (TC&C) subsystem allow a ground station to monitor and control conditions in the satellite.
True
False
Which technique uses two different antennas to reduce traffic on the same frequency?
Spatial isolation
Frequency reuse
Multiplexing
If the earth station downlink signal received is at fs = 4.08 GHz, what first stage local-oscillator frequency fLO is needed to achieve IF of 770 MHz?
3310 MHz
4080 MHz
1203 MHz
3250 MHz
The multiple access technique suitable only for digital transmission is
TDMA
FDMA
A synchronous satellite orbits the earth once in
24 hours
12 hours
6 hours
1 hour
Geostationary satellites are located at a height of -
(a)
The earth segment of a satellite communications system consists of the following
Transmit stations only
Receive stations only
Both transmit and receive earth stations
None of the other mentioned options
CDMA is an technique in which
Each signal is associated with a particular code used to spread the signal in frequency alone
Each signal is associated with a particular code used to spread the signal in time alone
Each signal is associated with a particular code used to spread the signal both frequency and time
The importance of guard time is to
Position the bursts within each frame.
Both prevent the bursts from overlapping and position them within each frame
Prevent the bursts from overlapping
GPS satellites belong to the following category
GEO
MEO
LEO
none of the above
The direction of orbit in the same direction of earth rotation is called ______
Retrograde
Prograde
Satellites closer to the earth travel at lower speeds than satellites that are far away from earth.
True
False
What is the angle of inclination for a satellite following an equatorial orbit?
(a)
The angle between the line from the earth station’s antenna to the satellite and the line between the earth station’s antenna and the earth’s horizon is called as ___________
Angle of inclination
Angle of elevation
Apogee angle
LOS angle
What is the point on the surface of the earth that is directly below the satellite called?
Satellite point
Subsatellite point
Supersatellite point
Overhead point
Why is there a huge spectrum space between the transmitted and received signal in satellite communication?
Reduce interference
Maximum efficiency
Less attenuation
To reduce space occupied by filters
What type of satellite TV service uses compressed data transmission to beam signals directly to every home?
Fixed satellite service
Broadcasting satellite service
Direct broadcast satellite
Mobile satellite service
What is the number of satellites present in the Iridium system?
72
51
66
32
The basic requirement of a satellite navigation system like GPS is that there must be ------satellites
(a)
