CHAPTER 5
TEST ITEMS
______________________________________________________________________
Multiple-Choice Questions
1. __________ will eventually replace most of the conventional copper telephone wires.
d. Microwaves
e. Quadruplex
2. One advantage of fiber-optic cable is that
d. telemetering devices convey transmissions far more rapidly than copper.
e. transponders amplify weak signals as they transverse optical fiber.
3. A cable television system assembles programs at the system’s __________ for delivery to
subscribers.
a. booster station
4. The pattern cable systems rely on to deliver programs to subscribers is called a(n) __________
pattern.
a. circle
5. Cable television is able to distribute a large number of channels to subscriber homes because it
d. multiplexes two and three signals on each channel.
e. propagates numerous waves over the air.
139
6. This technology is needed to receive PPV programming.
a. Microwave
b. DBS
7. In the future, this technology may be the focal point of a future home network connecting a wide
variety of digital and analog communication devices and services.
d. VBI
e. fiber-optic cable
8. Microwave relays are used in broadcasting for
a. signal amplification.
9. In a microwave relay, towers are spaced about __________ miles apart.
d. 60
e. 75
10. Which of the following statements is true?
a. Satellites can transmit signals to only 25 Earth stations at a time.
11. Satellites that appear to be suspended over the same spot on Earth are known as __________satellites.
a. national transmission
12. Which of the following statements about satellite transmissions is true?
d. A hemispheric satellite beam delivers the same quality as a global beam.
e. Geostationary satellites orbit anywhere from 15,000 to 18,000 miles above the earth’s surface.
140
13. Part of the satellite that both receives and transmits signals, amplifies them, and retransmits them
back to Earth is called the
a. uplink converter.
14. Signals on interactive media must be routed or __________ from source to intended receiver.
a. dropped
15. The Internet network resembles a
a. satellite distribution system.
16. This pioneering software program, introduced in 1993, used icons and point-and-click features and is
called
a. ARPANET.
True/False Questions
3. Cable systems avoid problems of signal interference and spectrum crowding by sending signals
4. Satellites link one specific location with only two others in sending and receiving points in the relay
5. Communication satellites need five essential groups of components: transponders, antennas, power
6. Each satellite needs two groups of frequencies, one for uplinking and the other for downlinking.
8. The Internet began in the late 1960s as a government-sponsored computing network called NSFnet.
141
9. Most American homes use a modem-equipped computer hooked to a conventional voice telephone
Essay Questions
1. Discuss advantages and disadvantages of microwave relays.
2. Explain how major international events such as the Olympic Games are relayed from game site to
home viewer via satellite.
142