TEST BANK
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Test Bank for Electronic Communications- A Systems
Approach
1st Edition
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TB
A N
KS
O
LU
TI
O
N
S
, Jeffrey Beasley: Electronic Communications-A Systems Approach
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(All Answers are in Bold)
Chapter 1: Fundamental Communications Concept
Multiple Choice Questions
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1. What agency in the United States has been given the authority to establish and enforce
TB
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
A
C. International Telecommunication Union (ITU)
D. Bell Laboratories
N
2. What three ratios do decibels represent?
A. Powers, voltages, currents
KS
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
O
A. Radio frequencies
B. Audio frequencies
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C. Current flows
D. Electric charges
4. The carrier is often a(n) .
A. sine wave
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B. vector
C. angular frequency
D. amplitude modulation
O
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
N
A. microwaves
B. gamma rays
C. cosmic rays
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D. radio waves
, 6. What two factors limit all communication systems?
A. Bandwidth and noise
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B. Bandwidth and frequency
C. Noise and decibels
D. Noise and currents
7. You are troubleshooting a piece of equipment and you find that unauthorized
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modifications may have been performed on the equipment. What type of failure does this
situation represent?
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A. Faulty
B. Complete
C. Induced
D. Poor system performance
A
8. Which of the following is an essential attribute for being an effective troubleshooter?
A. To know the latest trends in noise analysis
N
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
KS
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?
A. Atmospheric
B. Human-made
O
C. Space
D. Thermal
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10. White noise is directly proportional to both temperature and .
A. bandwidth
B. AC voltage
C. power transfer
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D. frequency
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
O
A. Angular
B. Square
N
C. Bathtub
D. Uneven
S
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
, 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
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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.
13. Which of the following pieces of equipment would be considered advanced test
S
equipment?
A. Digital multimeter (DMM)
TB
B. Broadband oscilloscope
C. Spectrum analyzer
D. RF generator
14. When troubleshooting, why would you perform voltage and resistance checks?
A
A. To check for signals
B. To eliminate induced failures
N
C. To observe frequency spectra
D. To isolate defective components
KS
15. Why would you use Friiss’s formula?
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.
O
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
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number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
A. Signals in the frequency domain
TI
B. Time-domain representation
C. Amplitude of each frequency component
D. Amplitude characteristics
O
17. consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
N
A. Decibel units
B. Frequency
C. Bandwidth
S
D. Noise
TE
Test Bank for Electronic Communications- A Systems
Approach
1st Edition
S
TB
A N
KS
O
LU
TI
O
N
S
, Jeffrey Beasley: Electronic Communications-A Systems Approach
TE
(All Answers are in Bold)
Chapter 1: Fundamental Communications Concept
Multiple Choice Questions
S
1. What agency in the United States has been given the authority to establish and enforce
TB
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
A
C. International Telecommunication Union (ITU)
D. Bell Laboratories
N
2. What three ratios do decibels represent?
A. Powers, voltages, currents
KS
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
O
A. Radio frequencies
B. Audio frequencies
LU
C. Current flows
D. Electric charges
4. The carrier is often a(n) .
A. sine wave
TI
B. vector
C. angular frequency
D. amplitude modulation
O
5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
N
A. microwaves
B. gamma rays
C. cosmic rays
S
D. radio waves
, 6. What two factors limit all communication systems?
A. Bandwidth and noise
TE
B. Bandwidth and frequency
C. Noise and decibels
D. Noise and currents
7. You are troubleshooting a piece of equipment and you find that unauthorized
S
modifications may have been performed on the equipment. What type of failure does this
situation represent?
TB
A. Faulty
B. Complete
C. Induced
D. Poor system performance
A
8. Which of the following is an essential attribute for being an effective troubleshooter?
A. To know the latest trends in noise analysis
N
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
KS
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?
A. Atmospheric
B. Human-made
O
C. Space
D. Thermal
LU
10. White noise is directly proportional to both temperature and .
A. bandwidth
B. AC voltage
C. power transfer
TI
D. frequency
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
O
A. Angular
B. Square
N
C. Bathtub
D. Uneven
S
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
, 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
TE
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.
13. Which of the following pieces of equipment would be considered advanced test
S
equipment?
A. Digital multimeter (DMM)
TB
B. Broadband oscilloscope
C. Spectrum analyzer
D. RF generator
14. When troubleshooting, why would you perform voltage and resistance checks?
A
A. To check for signals
B. To eliminate induced failures
N
C. To observe frequency spectra
D. To isolate defective components
KS
15. Why would you use Friiss’s formula?
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.
O
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
LU
number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
A. Signals in the frequency domain
TI
B. Time-domain representation
C. Amplitude of each frequency component
D. Amplitude characteristics
O
17. consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
N
A. Decibel units
B. Frequency
C. Bandwidth
S
D. Noise
