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TEST BANK FOR Electronic Communications: A Systems Approach 1st Edition by Jeffrey Beasley, Jonathan Hymer & Gary Miller , ISBN: 9780132988636 || Complete Guide A+$17.48
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TEST BANK FOR Electronic Communications: A Systems Approach 1st Edition by Jeffrey Beasley, Jonathan Hymer & Gary Miller , ISBN: 9780132988636 || Complete Guide A+
TEST BANK FOR Electronic Communications: A Systems Approach 1st Edition by Jeffrey Beasley, Jonathan Hymer & Gary Miller , ISBN: 9780132988636 || Complete Guide A+
TEST BANK
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Test Bank for Electronic Communications- A Systems
Approach
1st Edition
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, 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
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regulations regarding the use of radio transmitters and other generators of radio-
frequency energy?
A. Transport and Communications Ministry
B. Federal Communications Commission (FCC)
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C. International Telecommunication Union (ITU)
D. Bell Laboratories
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2. What three ratios do decibels represent?
A. Powers, voltages, currents
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B. Powers, voltages, frequencies
C. Voltages, frequencies, impedances
D. Logarithms, voltages, currents
3. Electric and magnetic fields both result from voltage potentials and .
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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
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5. Electronics as a discipline within the field of physical science emerged from the
discovery of .
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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
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8. Which of the following is an essential attribute for being an effective troubleshooter?
A. To know the latest trends in noise analysis
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B. To be able to limit the frequency response
C. To know the conversion from the time to the frequency domain
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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
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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?
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A. Angular
B. Square
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C. Bathtub
D. Uneven
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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
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equipment?
A. Digital multimeter (DMM)
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B. Broadband oscilloscope
C. Spectrum analyzer
D. RF generator
14. When troubleshooting, why would you perform voltage and resistance checks?
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A. To check for signals
B. To eliminate induced failures
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C. To observe frequency spectra
D. To isolate defective components
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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.
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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
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B. Time-domain representation
C. Amplitude of each frequency component
D. Amplitude characteristics
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17. consists of a mixture of signals at all frequencies and at randomly
occurring amplitudes.
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A. Decibel units
B. Frequency
C. Bandwidth
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D. Noise
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