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M
TEST BANK
PR
For
ES
Electronic Communications: A
Systems Approach 1st Edition
SI
by Jeffrey Beasley
VE
G
All Chapters Included (1-16)
R
AD
ES
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Beasley/Electronic Communications
M
Chapter 1: Fundamental Communications Concept
PR
Multiple Choice Questions
1. What agency in the United States has been given the authority to establish and enforce
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
ES
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
SI
2. What three ratios do decibels represent?
A. Powers, voltages, currents
B. Powers, voltages, frequencies
VE
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
A. Radio frequencies
G
B. Audio frequencies
C. Current flows
D. Electric charges
R
4. The carrier is often a(n) .
A. sine wave
AD
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
ES
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
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All Chapters Included
6. What two factors limit all communication systems?
A. Bandwidth and noise All Answers Included
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B. Bandwidth and frequency
C. Noise and decibels
D. Noise and currents
PR
7. You are troubleshooting a piece of equipment and you find that unauthorized
modifications may have been performed on the equipment. What type of failure does this
situation represent?
A. Faulty
B. Complete
ES
C. Induced
D. Poor system performance
8. Which of the following is an essential attribute for being an effective troubleshooter?
A. To know the latest trends in noise analysis
SI
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
D. To be able to isolate faulty components quickly and repair the defective circuit
9. Which of the following is the most troublesome form of external noise?
VE
A. Atmospheric
B. Human-made
C. Space
D. Thermal
G
10. White noise is directly proportional to both temperature and .
A. bandwidth
R
B. AC voltage
C. power transfer
D. frequency
AD
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
A. Angular
B. Square
C. Bathtub
ES
D. Uneven
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
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A. A means to break down any periodic waveform into a series of sine and/or cosine
waves at multiples of the fundamental frequency.
B. He created thermal interactions between free electrons and vibrating ions in a
M
conductor.
C. The formula for calculating shot noise contributed for a complete transistor.
D. The relative measure of the desired signal power to the noise power.
PR
13. Which of the following pieces of equipment would be considered advanced test
equipment?
A. Digital multimeter (DMM)
B. Broadband oscilloscope
C. Spectrum analyzer
ES
D. RF generator
14. When troubleshooting, why would you perform voltage and resistance checks?
A. To check for signals
B. To eliminate induced failures
SI
C. To observe frequency spectra
D. To isolate defective components
15. Why would you use Friiss’s formula?
VE
A. To provide the overall noise effect of a multistage system.
B. To break down any periodic waveform into a series of sine and/or cosine waves at
multiples of the fundamental frequency.
C. To establish that different users can share bands of frequencies provided that each
user was assigned exclusive use of a frequency range within that band.
D. To show how the construction of a square wave can be seen to be made up of a
G
number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
R
A. Signals in the frequency domain
B. Time-domain representation
C. Amplitude of each frequency component
AD
D. Amplitude characteristics
17. consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
A. Decibel units
ES
B. Frequency
C. Bandwidth
D. Noise
hgtrfed
M
TEST BANK
PR
For
ES
Electronic Communications: A
Systems Approach 1st Edition
SI
by Jeffrey Beasley
VE
G
All Chapters Included (1-16)
R
AD
ES
hgtrfed
, hgfds
Beasley/Electronic Communications
M
Chapter 1: Fundamental Communications Concept
PR
Multiple Choice Questions
1. What agency in the United States has been given the authority to establish and enforce
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
ES
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
SI
2. What three ratios do decibels represent?
A. Powers, voltages, currents
B. Powers, voltages, frequencies
VE
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
A. Radio frequencies
G
B. Audio frequencies
C. Current flows
D. Electric charges
R
4. The carrier is often a(n) .
A. sine wave
AD
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
ES
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
hgtrfed
, hgfds
All Chapters Included
6. What two factors limit all communication systems?
A. Bandwidth and noise All Answers Included
M
B. Bandwidth and frequency
C. Noise and decibels
D. Noise and currents
PR
7. You are troubleshooting a piece of equipment and you find that unauthorized
modifications may have been performed on the equipment. What type of failure does this
situation represent?
A. Faulty
B. Complete
ES
C. Induced
D. Poor system performance
8. Which of the following is an essential attribute for being an effective troubleshooter?
A. To know the latest trends in noise analysis
SI
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
D. To be able to isolate faulty components quickly and repair the defective circuit
9. Which of the following is the most troublesome form of external noise?
VE
A. Atmospheric
B. Human-made
C. Space
D. Thermal
G
10. White noise is directly proportional to both temperature and .
A. bandwidth
R
B. AC voltage
C. power transfer
D. frequency
AD
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
A. Angular
B. Square
C. Bathtub
ES
D. Uneven
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
hgtrfed
, hgfds
A. A means to break down any periodic waveform into a series of sine and/or cosine
waves at multiples of the fundamental frequency.
B. He created thermal interactions between free electrons and vibrating ions in a
M
conductor.
C. The formula for calculating shot noise contributed for a complete transistor.
D. The relative measure of the desired signal power to the noise power.
PR
13. Which of the following pieces of equipment would be considered advanced test
equipment?
A. Digital multimeter (DMM)
B. Broadband oscilloscope
C. Spectrum analyzer
ES
D. RF generator
14. When troubleshooting, why would you perform voltage and resistance checks?
A. To check for signals
B. To eliminate induced failures
SI
C. To observe frequency spectra
D. To isolate defective components
15. Why would you use Friiss’s formula?
VE
A. To provide the overall noise effect of a multistage system.
B. To break down any periodic waveform into a series of sine and/or cosine waves at
multiples of the fundamental frequency.
C. To establish that different users can share bands of frequencies provided that each
user was assigned exclusive use of a frequency range within that band.
D. To show how the construction of a square wave can be seen to be made up of a
G
number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
R
A. Signals in the frequency domain
B. Time-domain representation
C. Amplitude of each frequency component
AD
D. Amplitude characteristics
17. consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
A. Decibel units
ES
B. Frequency
C. Bandwidth
D. Noise
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