Chapter 1: Introduction to Electronic Communication
Student: ______
True / False Questions
1.Communication is the process of exchanging information.
TrueFalse
2.All electronic communication systems have a transmitter, a communication channel or medium, and a receiver.
TrueFalse
3.A transmitter is a collection of electronic components and circuits that accepts the transmitted message from the channel and converts it to a form understandable to humans.
TrueFalse
4.Optical media communication channels are only used for video analog signals.
TrueFalse
5.Examples of transceivers include telephones, fax machines, cellular telephones, and computer modems.
TrueFalse
6.Simplex communication refers to a two-way transmission type system.
TrueFalse
7.An analog signal is a smoothly and continuously varying voltage or current.
TrueFalse
8.Multiplexing makes the information signal more compatible with the medium.
TrueFalse
9.Modulation is the process of having a baseband voice, video, or digital signal modify another, higher-frequency signal, the carrier.
TrueFalse
10.A modem can be used to translate data from digital to analog and back again.
TrueFalse
11.Multiplexing is the process of allowing two or more signals to share the same medium or channel.
TrueFalse
12.The range of electromagnetic signals encompassing all frequencies is referred to as the optical spectrum.
TrueFalse
13.Wavelength is the distance occupied by one cycle of a wave.
TrueFalse
14.The wavelength of a signal is calculated by dividing the frequency of the wave by the speed of light.
TrueFalse
15.Low frequencies are in the 3- to 30-MHz range.
TrueFalse
Multiple Choice Questions
16.Frequencies that encompass the 300- to 3000-MHz range are under which of the following segments?
A.high frequency
B.very high frequency
C.ultrahigh frequency
D.microwave
17.Wireless local-area networks occupy which of the following segments?
A.high frequency
B.very high frequency
C.UHF
D.microwave and SHF
18.Just above the infrared region is the spectrum referred to as
A.light
B.millimeter waves
C.ultraviolet
D.gamma rays
19.The difference between the upper and lower frequency limits of a signal or the equipment operation range is the
A.amplitude
B.spectrum
C.bandwidth
D.medium
20.Signals generated at frequencies above and below a carrier frequency by an amount equal to the modulating frequency are called
A.duplex signals
B.sidebands
C.analog signals
D.gamma rays
21.What agency is responsible for allocating bands of frequencies and for setting limitations on broadcast power for different types of radio and TV operations?
A.OSHA
B.IEEE
C.FCC
D.ANSI
22.Which of the following organizations does not maintain standards for communication systems?
A.IEEE
B.ANSI
C.IBEW
D.ITU
23.Which of the following is not a simplex communication system?
A.TV broadcasting
B.paging services
C.radar
D.facsimile
24.Which communication application best describes movies, sports events, and other programs that are distributed to subscribers by fiber-optic and coaxial cable?
A.telemetry
B.cable television
C.TV broadcasting
D.wide-area networks
25.Which of the following is not a duplex type communication system?
A.telephones
B.sonar
C.telemetry
D.Internet
Fill in the Blank Questions
26.In the electronics industry, the specialization which is the largest in terms of people employed and the dollar value of equipment purchased is the ______field.
______
27.The two major types of technical positions available in the communication field are engineer and ______.
______
28.The four major segments of the communication electronics industry are manufacturers, ______, service organizations, and end users.
______
29.In electronic communication systems, the message is referred to as ______.
______
30.The communication ______is the medium by which the electronic signal is sent from one place to another.
______
31.A(n) ______is a collection of electronic components and circuits that accepts the transmitted message from the channel and converts it back to a form understandable by humans.
______
32.The measure of noise is usually expressed in terms of the ______ratio.
______
33.______signals do not vary continuously, but change in steps or in discrete increments.
______
34.______is the number of times a particular phenomenon occurs in a given period of time.
______
35.The ______region is between the highest radio frequencies and the visible portion of the electromagnetic spectrum.
______
Chapter 1: Introduction to Electronic Communication Key
1.TRUE
2.TRUE
3.FALSE
4.FALSE
5.TRUE
6.FALSE
7.TRUE
8.FALSE
9.TRUE
10.TRUE
11.TRUE
12.FALSE
13.TRUE
14.FALSE
15.FALSE
16.C
17.D
18.A
19.C
20.B
21.C
22.C
23.C
24.B
25.C
26.communications
27.technician
28.resellers
29.information or intelligence
30.channel
31.receiver
32.signal-to-noise
33.Digital
34.Frequency
35.infrared