VE
Beasley/Electronic Communications
R
IF
Chapter 1: Fundamental Communications Concept
IE
D
Multiple Choice Questions
BR
1. What agency in the United States has been given the authority to establish and enforce
AI
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
N
A. Transport and Communications Ministry
BO
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
O
ST
2. What three ratios do decibels represent?
A. Powers, voltages, currents
ER
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and _________.
A. Radio frequencies
B. Audio frequencies
C. Current flows
D. Electric charges
4. The carrier is often a(n) _____________.
A. sine wave
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of __________.
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
1
VERIFIEDBRAINBOOSTER
, VE
6. What two factors limit all communication systems?
R
IF
A. Bandwidth and noise
B. Bandwidth and frequency
IE
C. Noise and decibels
D. Noise and currents
D
BR
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?
AI
A. Faulty
N
B. Complete
C. Induced
BO
D. Poor system performance
O
8. Which of the following is an essential attribute for being an effective troubleshooter?
ST
A. To know the latest trends in noise analysis
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
ER
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
C. Space
D. Thermal
10. White noise is directly proportional to both temperature and _____________.
A. bandwidth
B. AC voltage
C. power transfer
D. frequency
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
A. Angular
B. Square
C. Bathtub
D. Uneven
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
2
VERIFIEDBRAINBOOSTER
, VE
A. A means to break down any periodic waveform into a series of sine and/or cosine
R
waves at multiples of the fundamental frequency.
IF
B. He created thermal interactions between free electrons and vibrating ions in a
conductor.
IE
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.
D
BR
13. Which of the following pieces of equipment would be considered advanced test
equipment?
AI
A. Digital multimeter (DMM)
B. Broadband oscilloscope
N
C. Spectrum analyzer
D. RF generator
BO
14. When troubleshooting, why would you perform voltage and resistance checks?
O
A. To check for signals
ST
B. To eliminate induced failures
C. To observe frequency spectra
D. To isolate defective components
ER
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.
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
number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
A. Signals in the frequency domain
B. Time-domain representation
C. Amplitude of each frequency component
D. Amplitude characteristics
17. ____________ consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
A. Decibel units
B. Frequency
C. Bandwidth
D. Noise
3
VERIFIEDBRAINBOOSTER
, VE
R
IF
18. What do modulated signals convey?
IE
A. Information
B. Voltage
D
C. Noise
BR
D. Power
19. Which of the following could cause a complete failure in a piece of equipment?
AI
A. Sporadic circuit operation
N
B. Open power resistors
C. Poor soldering
BO
D. Poor alignment
O
20. If you were troubleshooting a piece of equipment and you heard a frying noise, what
would this indicate?
ST
A. A wire is loose
B. The power is weakening
ER
C. A component is about to fail
D. The equipment has been abused
21. What does the noise figure (NF) specify?
A. Exactly how noisy a device is
B. The noise content at a specific point
C. The paths in which the charge carriers move
A. The ultimate noise performance
22. The terms Johnson, thermal, and _____ noise may be used interchangeably.
A. white
B. space
C. internal
D. external
23. Which of the following defines frequency domain?
A. Square waves are made up of the fundamental and its odd -numbered harmonics
B. Amplitude is viewed as a function of frequency rather than of time
C. Amplitude of each harmonic decreases as the frequency increases
D. Any or all of the sine or cosine terms may be zero, and there are no restrictions on
their amplitudes
4
VERIFIEDBRAINBOOSTER
Beasley/Electronic Communications
R
IF
Chapter 1: Fundamental Communications Concept
IE
D
Multiple Choice Questions
BR
1. What agency in the United States has been given the authority to establish and enforce
AI
regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
N
A. Transport and Communications Ministry
BO
B. Federal Communications Commission (FCC)
C. International Telecommunication Union (ITU)
D. Bell Laboratories
O
ST
2. What three ratios do decibels represent?
A. Powers, voltages, currents
ER
B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and _________.
A. Radio frequencies
B. Audio frequencies
C. Current flows
D. Electric charges
4. The carrier is often a(n) _____________.
A. sine wave
B. vector
C. angular frequency
D. amplitude modulation
5. Electronics as a discipline within the field of physical science emerged from the
discovery of __________.
A. microwaves
B. gamma rays
C. cosmic rays
D. radio waves
1
VERIFIEDBRAINBOOSTER
, VE
6. What two factors limit all communication systems?
R
IF
A. Bandwidth and noise
B. Bandwidth and frequency
IE
C. Noise and decibels
D. Noise and currents
D
BR
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?
AI
A. Faulty
N
B. Complete
C. Induced
BO
D. Poor system performance
O
8. Which of the following is an essential attribute for being an effective troubleshooter?
ST
A. To know the latest trends in noise analysis
B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
ER
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
C. Space
D. Thermal
10. White noise is directly proportional to both temperature and _____________.
A. bandwidth
B. AC voltage
C. power transfer
D. frequency
11. The overall noise-intensity versus frequency curves for semiconductor devices would
have what type of shape?
A. Angular
B. Square
C. Bathtub
D. Uneven
12. Which of the following did French mathematician Jean Baptiste Joseph Fourier develop?
2
VERIFIEDBRAINBOOSTER
, VE
A. A means to break down any periodic waveform into a series of sine and/or cosine
R
waves at multiples of the fundamental frequency.
IF
B. He created thermal interactions between free electrons and vibrating ions in a
conductor.
IE
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.
D
BR
13. Which of the following pieces of equipment would be considered advanced test
equipment?
AI
A. Digital multimeter (DMM)
B. Broadband oscilloscope
N
C. Spectrum analyzer
D. RF generator
BO
14. When troubleshooting, why would you perform voltage and resistance checks?
O
A. To check for signals
ST
B. To eliminate induced failures
C. To observe frequency spectra
D. To isolate defective components
ER
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.
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
number of sinusoids.
16. What does the graphical display produced by an oscilloscope represent?
A. Signals in the frequency domain
B. Time-domain representation
C. Amplitude of each frequency component
D. Amplitude characteristics
17. ____________ consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
A. Decibel units
B. Frequency
C. Bandwidth
D. Noise
3
VERIFIEDBRAINBOOSTER
, VE
R
IF
18. What do modulated signals convey?
IE
A. Information
B. Voltage
D
C. Noise
BR
D. Power
19. Which of the following could cause a complete failure in a piece of equipment?
AI
A. Sporadic circuit operation
N
B. Open power resistors
C. Poor soldering
BO
D. Poor alignment
O
20. If you were troubleshooting a piece of equipment and you heard a frying noise, what
would this indicate?
ST
A. A wire is loose
B. The power is weakening
ER
C. A component is about to fail
D. The equipment has been abused
21. What does the noise figure (NF) specify?
A. Exactly how noisy a device is
B. The noise content at a specific point
C. The paths in which the charge carriers move
A. The ultimate noise performance
22. The terms Johnson, thermal, and _____ noise may be used interchangeably.
A. white
B. space
C. internal
D. external
23. Which of the following defines frequency domain?
A. Square waves are made up of the fundamental and its odd -numbered harmonics
B. Amplitude is viewed as a function of frequency rather than of time
C. Amplitude of each harmonic decreases as the frequency increases
D. Any or all of the sine or cosine terms may be zero, and there are no restrictions on
their amplitudes
4
VERIFIEDBRAINBOOSTER
