Electronic Communications Final Exam Questions
Course Introduction
This course explores the fundamental principles and practical applications of electronic communications, encompassing both analog and digital transmission techniques. Students will learn about modulation and demodulation methods, transmission lines, antennas, and noise analysis, as well as the architecture of modern communication systems such as radio, television, satellite, and cellular networks. Emphasis is placed on signal propagation, bandwidth considerations, and the integration of hardware and software for data transmission. Through a combination of lectures and hands-on lab work, students gain essential skills required for designing and troubleshooting electronic communication circuits and systems.
Recommended Textbook
Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley
Available Study Resources on Quizplus
16 Chapters
396 Verified Questions
396 Flashcards
Source URL: https://quizplus.com/study-set/2901 Page 2
Chapter 1: Fundamental Communications Concept
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57802
Sample Questions
Q1) ____________ consists of a mixture of signals at all frequencies and at randomly occurring amplitudes.
A)Decibel units
B)Frequency
C)Bandwidth
D)Noise
Answer: D
Q2) 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
Answer: D
Q3) The terms Johnson,thermal,and _____ noise may be used interchangeably.
A)white
B)space
C)internal
D)external
Answer: A
To view all questions and flashcards with answers, click on the resource link above. Page 3
Chapter 2: Amplitude Modulation
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57794
Sample Questions
Q1) What law is represented when current flow through a device increases in direct proportion to voltage?
A)Hartley's law
B)Plank's law
C)Ohm's law
D)Henry's law
Answer: C
Q2) Which of the following is the term that defines when two signals at different frequencies are combined in a nonlinear device?
A)Aliasing
B)Mixing
C)Foldover distortion
D)Fluctuating
Answer: B
To view all questions and flashcards with answers, click on the resource link above.
Page 4
Chapter 3: Angle Modulation
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57793
Sample Questions
Q1) All communications systems are constrained by_____________.
A)bandwidth availability
B)reference frequency
C)sound waves
D)absence of modulation
Answer: A
Q2) What mathematical tool is used to solve for the frequency components of the frequency-modulated signal?
A)Bessel function
B)Modulation index
C)Deviation ratio
D)Percentage of modulation
Answer: A
To view all questions and flashcards with answers, click on the resource link above.
Chapter 4: Communications Circuits
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57792
Sample Questions
Q1) Which of the following configurations of an LC or RC filter is defined as a sharper transition from passband to stopband than other configurations,but with ripple on both?
A)Chebyshev
B)Cauer
C)Bessel
D)Butterworth
Q2) Why are virtually all oscillators used in communications applications the feedback type?
A)They are capable of producing highly pure sine waves.
B)The currents in the diodes and the currents in the transistors are the same.
C)They use RC timing circuits to generate nonsinusoidal waveforms.
D)They allow waveform distortion.
Q3) What is the purpose of a balanced modulator?
A)To produce an output frequency that varies in response to changes in a control voltage.
B)To change frequency in response to a DC control voltage applied to it.
C)To allow a range of frequencies to be generated from a stable, single-frequency reference.
D)To suppress the carrier, leaving only the two sidebands.
To view all questions and flashcards with answers, click on the resource link above.
Page 6
Chapter 5: Transmitters
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57791
Sample Questions
Q1) A direct FM system is one in which the frequency of the carrier oscillator is directly varied by the ___________.
A)unwanted sideband suppression
B)phase-shifted data
C)modulating signal
D)capacitance
Q2) FM transmitters are composed of oscillators,amplifiers,modulating stages,and ____________.
A)filters
B)sidebands
C)circuits
D)analyzers
Q3) Which of the following is when signals are multiplexed together by having them coexist in two different frequency ranges?
A)Frequency multipliers
B)Frequency-division multiplexing
C)Frequency-modulation
D)Preemphasis
To view all questions and flashcards with answers, click on the resource link above.
7
Chapter 6: Receivers
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57790
Sample Questions
Q1) Which of the following is responsible for the image frequency rejection characteristics of the receiver?
A)Auxiliary AGC diode
B)Automatic frequency control (AFC)
C)Preselector
D)Discriminator
Q2) Which of the following quantifies how the received signal is impaired by both noise voltages and distortion components?
A)SINAD
B)Noise floor
C)Dynamic range
D)Squelch
Q3) What is the name for the additional signal used to transmit music programming that is usually commercial-free but paid for by subscription?
A)PLL FM demodulator
B)Subsidiary communication authorization
C)Quadrature detector
D)Foster-Seeley discriminator
To view all questions and flashcards with answers, click on the resource link above.
8
Chapter 7: Digital Communications Techniques
Available Study Resources on Quizplus for this Chatper
24 Verified Questions
24 Flashcards
Source URL: https://quizplus.com/quiz/57789
Sample Questions
Q1) What is the most common method of error detection?
A)Block check character
B)CRC dividing circuit
C)Parity
D)Cyclic redundancy check
Q2) What does error detection and correction techniques rely heavily on?
A)Digital signal processing
B)Baseband transmission
C)Pulse modulation
D)Capacitance
Q3) What technique do Reed-Solomon (RS)codes employ to enable the system to correct multiple data-bit errors?
A)Aliasing
B)Amplitude companding
C)Natural sampling
D)Interleaving
To view all questions and flashcards with answers, click on the resource link above.
9
Chapter 8: Digital Modulation and Demodulation
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57788
Sample Questions
Q1) Which of the following achieves high spectral efficiencies because the spacing of each carrier is as close as theoretically possible?
A)Direct-sequence spread spectrum (DSSS)
B)Quadrature amplitude modulation (QAM)
C)Orthogonal frequency-division multiplexing (OFDM)
D)Code-division multiple access (CDMA)
Q2) Where is minimum-shift keying (MSK)widely used?
A)Radios
B)Cordless phones
C)Military applications
D)Garage-door openers
Q3) What law allows us to predict the minimum bandwidth required for information transfer in a given time interval?
A)Ohm's
B)Gaussian's
C)Fourier's
D)Hartley's
To view all questions and flashcards with answers, click on the resource link above. Page 10
Chapter 9: Telephone Networks
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57787
Sample Questions
Q1) Who provides the switch for the frame relay network?
A)Subscribers
B)FCC
C)Computer services
D)Commercial carriers
Q2) The CSU/DSU has three alarm modes for advising the user about problems on the link. What does a blue alarm indicate?
A)Failure in the link has been detected
B)Incoming signal has been corrupted
C)Total loss of incoming signal
D)Incoming signal has been detected
Q3) What type of effect does noise have on a signal?
A)Harmonic
B)Distorted
C)Additive
D)Amplified
To view all questions and flashcards with answers, click on the resource link above.
11
Chapter 10: Wireless Communications Systems
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57801
Sample Questions
Q1) Which of the following is composed of bands of frequencies set aside by the Federal Communications Commission (FCC)to support short-range,high-speed,wireless data communications?
A)Unlicensed national information infrastructure (U-NII)
B)Wireless local-area networks (WLANs)
C)Wireless application protocol (WAP)
D)Radio frequency identification (RFID)
Q2) What standards were developed to address key delivery problems with wireless data networks?
A)Broadband wireless access (BWA)
B)Data encryption standard (DES)
C)Global System for Mobile Communications (GSM)
D)Wireless application protocol (WAP)
Q3) What are assigned around licensed channels to minimize the possibility of interference?
A)Guard bands
B)Guarantees
C)Bug fixes
D)Basebands
To view all questions and flashcards with answers, click on the resource link above.
Page 12
Chapter 11: Computer Communication and the Internet
Available Study Resources on Quizplus for this Chatper
23 Verified Questions
23 Flashcards
Source URL: https://quizplus.com/quiz/57800
Sample Questions
Q1) What is the most common maintenance situation for larger LAN installations?
A)Ethernet protocol
B)Handshaking protocol
C)LAN interconnection
D)Help desk
Q2) What protocol is the most widely used for local-area networks (LANs)?
A)Networking
B)Ethernet
C)Internet
D)Handshaking
Q3) What type of topology is the most common in today's LANs?
A)Token-ring
B)Broadcast
C)Bus
D)Star
Q4) What does the DSL technology use for carrying the data?
A)Data link layers
B)Existing copper telephone lines
C)Computer links
D)Cable modems
To view all questions and flashcards with answers, click on the resource link above. Page 13
Chapter 12: Transmission Lines
Available Study Resources on Quizplus for this Chatper
24 Verified Questions
24 Flashcards
Source URL: https://quizplus.com/quiz/57799
Sample Questions
Q1) What does power-sum testing measure?
A)Total crosstalk of all cable pairs
B)Diameter of copper, cable handling, and dielectric differences
C)Signal reflection results from impedance changes
D)Any noise or unwanted signal picked up by the balanced line
Q2) A ______________ terminated in an open has a reflected voltage wave that is always of the same polarity and amplitude as the incident voltage wave.
A)transmission line
B)magnetic field
C)wavelength
D)circuit
Q3) The problem of radiation loss is of consequence for only what type of transmission lines?
A)Unshielded twisted-pair
B)Twisted pair
C)Parallel-wire
D)Shielded pair
To view all questions and flashcards with answers, click on the resource link above.
14
Chapter 13: Wave Propagation
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57798
Sample Questions
Q1) Frequency blackouts are closely related to certain types of ____________.
A)sunspot activity
B)turbulence
C)fading
D)energy
Q2) What type of system allows multiple inexpensive stations to be linked to a large,central installation?
A)Sirius
B)Earth station
C)Very small aperture terminal (VSAT)
D)Ultrasmall aperture terminal mobile satellite (MSAT)
Q3) A satellite communication system consists of an uplink,a downlink,and a(n)_______________.
A)apogee
B)electromagnetic field
C)perigee
D)orbiting satellite
To view all questions and flashcards with answers, click on the resource link above.
Page 15
Chapter 14: Antennas
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57797
Sample Questions
Q1) What does the height of the antenna above ground affect?
A)Radiation resistance
B)Radiation pattern
C)Radiation loss
D)Radiation fields
Q2) What is one advantage of connecting a resonant transmission line to an antenna?
A)It decreases power losses.
B)Its electrical length corresponds closely to its physical length.
C)It is an effective resistance related to the power radiated by the antenna.
D)It makes impedance matching unnecessary.
Q3) Which of the following terms defines the orientation of the electric field,which is the same as the antenna's physical configuration?
A)Reciprocity
B)Beamwidth
C)Resonance
D)Polarization
To view all questions and flashcards with answers, click on the resource link above. Page 16
Chapter 15: Waveguides and Radar
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57796
Sample Questions
Q1) Which of the following would be a use of a variable attenuator at microwave frequencies?
A)To prevent reflections
B)To change the physical direction of propagation
C)To measure signal levels
D)To change the plane of polarization of the wave
Q2) There are three methods of coupling energy into or out of a waveguide: probe,loop,and __________.
A)aperture
B)transverse electric
C)dominant mode
D)flexible
Q3) In a radar system,which of the following are frequently detected when there is a large target close by?
A)Double range echoes
B)Second return echoes
C)Multiple-time around echoes
D)Duty cycles
To view all questions and flashcards with answers, click on the resource link above.
17
Chapter 16: Fiber Optics
Available Study Resources on Quizplus for this Chatper
25 Verified Questions
25 Flashcards
Source URL: https://quizplus.com/quiz/57795
Sample Questions
Q1) ___________ is the loss of power introduced by the fiber.
A)Polarization
B)Fusion splicing
C)Cladding
D)Attenuation
Q2) The ____________ specifies the maximum losses that can be tolerated in the fiber system.
A)power budget
B)bit error rate
C)spectral width test
D)optical power meter
Q3) __________ is a long-term method in which two fibers are fused or welded together.
A)Mechanical splicing
B)Index matching
C)Fusion splicing
D)Connectorization
To view all questions and flashcards with answers, click on the resource link above. Page 18