LESSON 1
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct answer
for each item. When you complete the exercise, check your answers with the answer key that follows. If you
answer any item incorrectly, study that part of the lesson which contains the portion involved.
1.
An integrated communications system that covers a large area contains local lines, equipment loops, long-
distance trunks, and tributary lines. Communications systems using satellite links are normally used as-
A.
Local lines
B.
Equipment loops
C.
Tributary lines
D.
Long-distance trunks
2.
The antenna of a ground terminal in a communications satellite system must track the satellite in its
movement across the sky. Many of the technical problems associated with this operation can be largely
eliminated by using satellites in what kind of orbits?
A.
Random
B.
Equatorial
C.
Synchronous
D.
Extremely high-altitude
3.
Assume that the ground terminals of a satellite communications system are in contact through an orbiting
satellite. As the ground terminal antennas track the satellite in the direction of the sun, the operators
should notice-
A.
A signal fade due to increasing density of ionization
B.
An increase of thermal background
C.
An increase of satellite power output
D.
More interchannel interference
4.
Which reason indicates that FM is preferred to AM in satellite communications systems?
A.
FM uses a narrow bandwidth signal
B.
FM requires less output power than AM
C.
FM minimizes the effect of noise peaks
D.
FM operates at higher frequencies than AM
1-39
SS0031
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