Digital and Analog Communication Review Questions
Course Introduction
This course provides an in-depth exploration of both digital and analog communication systems, focusing on the fundamental principles and technologies underlying the transmission and reception of information. Topics include modulation and demodulation techniques, signal analysis, bandwidth considerations, noise effects, error detection and correction, and the architecture of contemporary communication systems. Students will gain an understanding of the advantages, limitations, and real-world applications of digital and analog communication methods, preparing them to analyze, design, and optimize modern telecommunications networks.
Recommended Textbook
Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley
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16 Chapters
396 Verified Questions
396 Flashcards
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Page 2
Chapter 1: Fundamental Communications Concept
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Sample Questions
Q1) When troubleshooting,why would you perform voltage and resistance checks?
A)To check for signals
B)To eliminate induced failures
C)To observe frequency spectra
D)To isolate defective components
Answer: D
Q2) Which of the following pieces of equipment would be considered advanced test equipment?
A)Digital multimeter (DMM)
B)Broadband oscilloscope
C)Spectrum analyzer
D)RF generator
Answer: C
Q3) The terms Johnson,thermal,and _____ noise may be used interchangeably.
A)white
B)space
C)internal
D)external
Answer: A
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Page 3
Chapter 2: Amplitude Modulation
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Sample Questions
Q1) Why are SSB receivers more difficult to tune than conventional AM receivers?
A)Need for carrier reinsertion
B)Bandwidth required by SSB cut in half
C)Complete signal cancellation may result
D)Overcrowded high-frequency spectrum
Answer: A
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
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Chapter 3: Angle Modulation
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Sample Questions
Q1) Which of the following is used primarily for two-way voice communication rather than entertainment?
A)Wideband FM
B)Guard bands
C)Narrowband FM (NBFM) systems
D)Specialized mobile radios (SMRs)
Answer: D
Q2) What type of tables show the number of significant side frequencies and the relative amplitudes in each set of side frequencies as well as in the carrier?
A)FM spectrum
B)Bessel
C)Carson
D)Zero-carrier
Answer: B
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Page 5
Chapter 4: Communications Circuits
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Sample Questions
Q1) 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.
Q2) To what does any modern,"frequency-agile" communication system owe its existence?
A)Crystal oscillators
B)Amplifiers
C)Parallel LC tank circuits
D)Phase-locked loops
Q3) Resonance is the condition where inductive and capacitive reactances are ___________.
A)equal
B)reduced
C)increased
D)rejected
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6
Chapter 5: Transmitters
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Sample Questions
Q1) The modulation process is accomplished in a(n)________________.
A)nonlinear device
B)linear devices
C)transmitter
D)amplifier
Q2) The ___________ of SSB generation relies on the fact that the upper and lower sidebands of an AM signal differ in the sign of their phase angles.
A)frequency deviation
B)phase shift
C)phase method
D)modulator stage
Q3) What term is used to denote the circuitry that generates the modulated signal?
A)Detector
B)Exciter
C)Pump chain
D)Discriminator
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Chapter 6: Receivers
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Sample Questions
Q1) Demodulation of the SSB signal requires a beat-frequency oscillator and a(n)_____________.
A)intelligence signal
B)mixer stage
C)diode detector
D)sideband receiver
Q2) What is the factor most directly limiting sensitivity?
A)Bandwidth
B)Carrier frequency
C)Sufficient amplification
D)Noise
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
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Chapter 7: Digital Communications Techniques
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Sample Questions
Q1) What does error detection and correction techniques rely heavily on?
A)Digital signal processing
B)Baseband transmission
C)Pulse modulation
D)Capacitance
Q2) Which of the following did Harry Nyquist in 1928 first demonstrate mathematically?
A)An analog signal can be reconstructed from periodic samples.
B)Pulses can be time-division multiplexed over a single communication channel.
C)The sample rate must be at least twice the highest frequency of the intelligence or information signal to be sampled.
D)Analog signals are quantized to the closest binary value provided in the digitizing system.
Q3) _________ is assigning one of a fixed number of numerical values to each pulse.
A)Coding
B)Sampling
C)Quantizing
D)Decoding
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Chapter 8: Digital Modulation and Demodulation
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Sample Questions
Q1) A sine or cosine wave can be thought of as consisting of both positive and negative
A)frequencies
B)signals
C)ranges
D)carriers
Q2) What is one advantage provided by a phase-shift keying (PSK)system?
A)Improved noise performance
B)Better ionospheric fading characteristics
C)Low probability of error
D)Transmitter frequency is constantly changing
Q3) Each form of digital modulation has implications in terms of spectral efficiency,power distribution,and _________.
A)amplitude
B)bandwidth
C)performance
D)distortion
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Chapter 9: Telephone Networks
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Sample Questions
Q1) Regardless of whether signals are modulated or not,what must first happen to data?
A)It must be sequenced.
B)It must be controlled.
C)It must be coded.
D)It must be framed.
Q2) The world's public switched telephone networks,both wireline and mobile,communicate with each other by means of a signaling protocol known as
A)private branch exchange (PBX)
B)Signaling System 7
C)public switched telephone network (PSTN)
D)public data network (PDN)
Q3) Which of the following is the standard carrier system in North America?
A)MUX
B)T carrier
C)E carrier
D)TDMA
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Chapter 10: Wireless Communications Systems
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Sample Questions
Q1) What are assigned around licensed channels to minimize the possibility of interference?
A)Guard bands
B)Guarantees
C)Bug fixes
D)Basebands
Q2) __________ uses a frequency-hopping spread-spectrum format.
A)Bluetooth
B)Broadband wireless access
C)Unlicensed national information infrastructure
D)Multiple-input multiple-output
Q3) Both analog and digital land-mobile systems depend on __________ to provide wide-area coverage.
A)software-based signal-processing
B)repeaters
C)ADC converters
D)local oscillators
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Chapter 11: Computer Communication and the Internet
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Sample Questions
Q1) What term is used to indicate a computer,computer terminal,or personal computer?
A)Data communications equipment (DCE)
B)Data set ready (DSR)
C)Data carrier detect (DCD)
D)Data terminal equipment (DTE)
Q2) Which of the following is the common serial data connection for computer modems and the mouse interface?
A)RS-232
B)RS-422
C)RS-449
D)RS-485
Q3) Which of the following has become a nearly universal high-speed serial communications interface?
A)IP telephony
B)xDSL
C)USB port
D)ASCII
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Chapter 12: Transmission Lines
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Sample Questions
Q1) What substance is commonly used as the dielectric in transmission lines?
A)Teflon
B)Pyrex
C)Rubber
D)Copper
Q2) 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
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
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Chapter 13: Wave Propagation
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Sample Questions
Q1) A satellite communication system consists of an uplink,a downlink,and a(n)_______________.
A)apogee
B)electromagnetic field
C)perigee
D)orbiting satellite
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) Where would tropospheric scatter provide reliable long-distance communication links?
A)Deserts
B)Small cities
C)Suburban areas
D)Metropolitan centers
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Chapter 14: Antennas
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Sample Questions
Q1) The monopole antenna is used primarily with frequencies below __________.
A)2 MHz
B)100 MHz
C)50 MHz
D)55 MHz
Q2) 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
Q3) 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.
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Chapter 15: Waveguides and Radar
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Q1) The series tee is often used for _____________.
A)a single antenna to be used for both transmission and reception
B)adjusting signal levels
C)physically reversing a directional coupler
D)impedance matching
Q2) What is the most popular shape of a waveguide?
A)Octagonal
B)Circular
C)Rectangular
D)Square
Q3) Doppler radar is a continuous-wave form of radar. Which of the following is it used to determine?
A)Speed of moving objects
B)Velocity of energy propagation
C)Peak power of a radar pulse
D)Transmission of microwave energy
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Chapter 16: Fiber Optics
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Sample Questions
Q1) What is optical fiber made of?
A)Ultrapure glass
B)Plastic
C)Copper
D)Polymers
Q2) The eye can't see fiber-optic communications wavelengths,so there is no pain or awareness of exposure,but what part of the eye can still be exposed and damaged?
A)Iris
B)Retina
C)Lens
D)Cornea
Q3) Visible light striking a prism causes refraction at both air/glass interfaces and separates the light into its various frequencies,which appear as__________.
A)fibers
B)beamwidths
C)colors
D)pulses
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Page 18