Network Analysis and Communications Exam Preparation Guide
Course Introduction
Network Analysis and Communications explores the foundational principles and modern methodologies used to understand, design, and manage communication networks. The course covers topics such as network topologies, protocols, data transmission techniques, and network architectures, with an emphasis on both wired and wireless systems. Students will learn about the analysis of network performance, reliability, and security, as well as emerging communication technologies and their applications. Through theoretical instruction and practical exercises, this course equips learners with the skills to evaluate and optimize communication networks in various real-world contexts.
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) ____________ 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) 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
D)The ultimate noise performance
Answer: A
Q3) 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
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Chapter 2: Amplitude Modulation
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Sample Questions
Q1) Undesired frequencies in close proximity to desired ones,such as a difference frequency appearing within the baseband,are difficult if not impossible to identify and remove after they have been created.What does this occurrence represent?
A)Modulation envelope
B)Pure sine-wave intelligence
C)Foldover distortion
D)Modulating signal frequency
Answer: C
Q2) Transmission of a modulated signal with both the carrier and one sideband removed produces what type of signal?
A)SSB
B)AM
C)FM
D)HF
Answer: A
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Page 4
Chapter 3: Angle Modulation
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Q1) Which of the following is (are)always equal to twice the highest frequency of the modulating signal,regardless of its amplitude?
A)FM bandwidth
B)Frequency deviation
C)AM bandwidth
D)Frequency domains
Answer: C
Q2) _____________and phase modulation are interrelated.
A)Frequency
B)Bandwidth
C)Voltage
D)Intelligence
Answer: A
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5
Chapter 4: Communications Circuits
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Sample Questions
Q1) When are CMOS devices preferred?
A)When power consumption is a consideration.
B)When much smaller spacing between output frequencies is necessary.
C)When stability is directly governed by the stability of the reference input.
D)When synthesizer frequency range is determined by the range of frequencies over which the VCO can operate.
Q2) ___________ manifests itself as an opposition to current flow in ac circuits and is measured in ohms.
A)Resistance
B)Reactance
C)Impedance
D)Capacitance
Q3) What is commonly used in single-sideband systems to attenuate the unwanted sideband?
A)Passband
B)Stopband
C)Wire leads
D)Crystal filter
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6
Chapter 5: Transmitters
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Q1) What will a standard oscilloscope display of the transmitted AM signal indicate?
A)Modulating voltage
B)Gross deficiencies
C)Intelligence frequency rate
D)Available energy
Q2) What term is used to denote the circuitry that generates the modulated signal?
A)Detector
B)Exciter
C)Pump chain
D)Discriminator
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
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7
Chapter 6: Receivers
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Sample Questions
Q1) Why is amplification with an antenna?
A)Low noise
B)Small signal
C)Small bandwidth
D)Variable-selectivity problems
Q2) What is one advantage of the direct-conversion architecture?
A)Superior intermodulation performance
B)Simplicity
C)Superior cross-modulation
D)Fully implemented with discrete components
Q3) Which of the following silences the audio amplifier stages until a carrier is detected?
A)TRF
B)S meter
C)Conversion oscillator
D)Squelch circuits
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8
Chapter 7: Digital Communications Techniques
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Q1) PCM is a building block in many digital communication applications and consists of three steps: sampling,quantizing,and __________.
A)decoding
B)coding
C)error-detection
D)retransmission
Q2) What is the chief disadvantage of analog communication?
A)Simplicity
B)Bandwidth requirements
C)Susceptibility to noise
D)Cost
Q3) Which of the following forms the basis for class D power amplification?
A)PCM
B)PPM
C)PAM
D)PWM
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Chapter 8: Digital Modulation and Demodulation
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Q1) The ________ demodulator reverses the process of modulation,thereby recovering the original binary data signal.
A)QAM
B)ISM
C)FSK
D)BER
Q2) The power of DSSS systems is largely in the spreading and dispreading of the received signal because it gives rise to a phenomenon known as ______________.
A)channel coding
B)spectral regrowth
C)processing gain
D)frequency-hopping
Q3) Which of the following is a key characteristic of orthogonal frequency-division multiplexing?
A)Amplitude modulation
B)Noise performance
C)Digital modulation
D)Spectral efficiency
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Chapter 9: Telephone Networks
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Q1) Which of the following is the standard carrier system in North America?
A)MUX
B)T carrier
C)E carrier
D)TDMA
Q2) What is the busiest day of the week for telephone traffic?
A)Sunday
B)Monday
C)Saturday
D)Friday
Q3) A __________ is a packet switching network designed to carry data traffic over a public data network (PDN).
A)frame relay
B)trunk
C)local loop
D)loopback
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Page 11
Chapter 10: Wireless Communications Systems
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Q1) The use of cryptography means that the information being transmitted over the air is
A)classified
B)jammed
C)disrupted
D)encrypted
Q2) What is the basis of RFID tag classification?
A)How they obtain their operating power
B)Their overall power consumption
C)Their intended application
D)How they store information
Q3) 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)
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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 has become a nearly universal high-speed serial communications interface?
A)IP telephony
B)xDSL
C)USB port
D)ASCII
Q3) 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
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Chapter 12: Transmission Lines
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Q1) A _________ is a transmission line that is terminated with an impedance that is not equal to its characteristic impedance.
A)nonresonant line
B)line wavelength
C)terminated line
D)resonant line
Q2) 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
Q3) Which of the following is a disadvantage of not having a perfectly matched (flat line)system?
A)The existence of reflections increases the power surge.
B)"Ghost" signals can be destroyed.
C)The full generator power does not reach the load.
D)Noise problems are increased by matches.
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14
Chapter 13: Wave Propagation
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Sample Questions
Q1) What type of information does Global Positioning System (GPS)provide?
A)Pinpoint geographic locations
B)Multipath transmissions
C)Converts energy from one form to another
D)Sky-wave communication
Q2) When is the degree of ionization greater?
A)Winter and nighttime
B)Summer and daytime
C)Winter and daytime
D)Summer and nighttime
Q3) Skip distance is affected by the degree of _________________.
A)ionic recombination
B)radiation
C)ionization
D)solar disturbance
Q4) The greater the bandwidth,the greater the problem with ________________.
A)phase distortion
B)refraction
C)tropospheric scatter
D)fading
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Chapter 14: Antennas
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Q1) Antenna bandwidth is defined with respect to its design _____________.
A)frequency
B)components
C)complexity
D)directivity
Q2) What type of communication is generally of a point-to-point nature?
A)Terrestrial
B)Microwave
C)Satellite
D)Voice-grade
Q3) An antenna is a transducer that converts energy from electrical form to _____________ form and vice versa.
A)magnetic
B)electromagnetic
C)radiated
D)polarized
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Page 16
Chapter 15: Waveguides and Radar
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Q1) What is necessary for radar to provide an accurate directional picture?
A)Highly directive antenna
B)Cavity capacitance
C)Electromagnetic energy
D)Maximum usable range
Q2) What one unique advantage do ridged waveguides provide?
A)It consists of a main run with a rectangular waveguide and a circular rotating joint.
B)It is less expensive to manufacture than a standard rectangular waveguide.
C)It allows operation at lower frequencies for a given set of outside dimensions.
D)It has a value greater than the speed of light.
Q3) For a wave to exist in a waveguide,it must satisfy __________ equations throughout the waveguide.
A)Doppler's
B)Smith's
C)Maxwell's
D)Ohm's
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17
Chapter 16: Fiber Optics
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Sample Questions
Q1) ___________ causes a light wave to be bent.
A)Electromagnetic coupling
B)Reflection
C)Refraction
D)Radiation
Q2) Where does modal dispersion predominantly occur?
A)Multimode fiber
B)Single-mode fiber
C)Diode lasers
D)LEDs
Q3) What is the purpose of an isolator?
A)Allows optical power to flow in one direction only
B)Reduces the received signal level
C)Used in simplex systems where a single optical signal is divided and sent to several receivers
D)Combines or divides two or more optical signals
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