Wireless Communication Exam Questions
Course Introduction
Wireless Communication explores the fundamental principles, technologies, and applications involved in transmitting information without the use of physical connections. This course covers core topics such as signal propagation, modulation techniques, multiple access schemes, wireless network protocols, and system design considerations. Students learn about key wireless standards, cellular networks, Wi-Fi, Bluetooth, and emerging wireless technologies, as well as the challenges related to interference, bandwidth allocation, and security. By the end of the course, students gain a comprehensive understanding of how wireless systems operate and integrate into modern communication infrastructures.
Recommended Textbook
Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley
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16 Chapters
396 Verified Questions
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Page 2
Chapter 1: Fundamental Communications Concept
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Q1) If you were troubleshooting a piece of equipment and you heard a frying noise,what would this indicate?
A)A wire is loose
B)The power is weakening
C)A component is about to fail
D)The equipment has been abused
Answer: C
Q2) 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
Answer: B
Q3) Which of the following is the most troublesome form of external noise?
A)Atmospheric
B)Human-made
C)Space
D)Thermal Answer: B
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Chapter 2: Amplitude Modulation
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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) A phasor rotating at a constant rate will generate a(n)____________.
A)sine wave
B)angular velocity
C)waveform
D)amplitude
Answer: A
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4
Chapter 3: Angle Modulation
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Q1) Why would a lightning strike be a concern for AM radios?
A)Frequency and phase modulation are interrelated.
B)Bandwidth is twice the highest intelligence frequency.
C)AM receiver susceptible to external electrical noise.
D)Modulation increases the total transmitted power.
Answer: C
Q2) _____________and phase modulation are interrelated.
A)Frequency
B)Bandwidth
C)Voltage
D)Intelligence
Answer: A
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Chapter 4: Communications Circuits
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Q1) The rate of attenuation is the steepness of the filter's response curve. What term is used to describe this rate?
A)Tank circuit
B)Dissipation
C)Roll-off
D)Band-reject
Q2) Which of the following is an advantage of mechanical filters?
A)New technology
B)Extreme flexibility
C)Excellent rejection characteristics
D)Compatible with larger equipment
Q3) Frequency multiplication introduces ___________.
A)noise
B)high reference frequencies
C)drift problems
D)output waveform
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Chapter 5: Transmitters
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Q1) _____________ is the simultaneous transmission of two or more signals on one carrier.
A)Phase-detector output
B)Operating frequency
C)Electronic circuitry
D)Multiplex operation
Q2) What term describes amplifiers intended to produce intermediate levels of power amplification?
A)Transformer
B)Capacitor
C)Driver
D)Carrier
Q3) FM transmitters are composed of oscillators,amplifiers,modulating stages,and
A)filters
B)sidebands
C)circuits
D)analyzers
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Chapter 6: Receivers
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Q1) What is the key to the superior selectivity of the superheterodyne receiver?
A)Constant bandwidth
B)Low frequencies
C)Image frequency
D)Intelligence detection
Q2) What does it mean if two signals are said to be in quadrature?
A)At a 90° angle
B)Output is zero with no modulation
C)One-half that for the Foster-Seeley circuit
D)Phase-shift detection arises quite often
Q3) What type of detector is a circuit designed to respond only to frequency changes of the input signal?
A)Slope
B)Ratio
C)Quadrature
D)Synchronous
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Chapter 7: Digital Communications Techniques
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Q1) The process of ____________ is one of reproducing the original analog signal.
A)coding
B)modulation
C)demodulation
D)aliasing
Q2) Techniques that allow correction at the receiver are called forward error-correcting codes.Which of the following is an example of an FEC?
A)Nyquist
B)Hamming
C)Schmitt
D)Fourier
Q3) Which of the following allows complex,periodic waveforms to be broken down into a series of sine and cosine terms?
A)Flat-top sampling
B)Quantization
C)Reconstruction
D)Fourier analysis
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Chapter 8: Digital Modulation and Demodulation
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Q1) Which of the following is the basis for cellular systems employing the code-division multiple access (CDMA)standard?
A)COFDM
B)QPSK
C)OFDM
D)DSSS
Q2) What type of receiver detects the phase shift in the received signal?
A)Binary phase-shift keying
B)Quadrature phase-shift keying
C)Differential phase-shift keying
D)Frequency-shift keying
Q3) Why are signals that are in quadrature said to be orthogonal?
A)They do not interfere with each other.
B)They split into two paths.
C)They can shift to one of two predetermined phase states.
D)The amount of data that can be transmitted over time.
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Chapter 9: Telephone Networks
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Q1) Which of the following is a set of rules designed to force the devices sharing a channel to observe orderly communications procedures?
A)Framing
B)Public data network
C)Handshaking
D)Protocol
Q2) ____________ occurs when calls are unable to reach their destination as a result of excess demand for system capacity.
A)Delay distortion
B)Switching
C)Congestion
D)Attenuation distortion
Q3) Transmission of information in a communications link is defined by three protocol techniques: half duplex,full duplex,and __________.
A)asynchronous
B)framing
C)simplex
D)synchronous
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11
Chapter 10: Wireless Communications Systems
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Q1) What type of radio provides the promise that licensed and unlicensed services can coexist in the same spectrum?
A)Cognitive
B)Two-way
C)Adaptable
D)Portable
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) Which of the following professions would most likely use a specialized land-mobile radio (SMR)?
A)Computer programmer
B)Emergency response personnel
C)Cyber security personnel
D)Radio broadcaster
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12
Chapter 11: Computer Communication and the Internet
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Q1) Which of the following capitalizes on a high-bandwidth network to deliver high-speed,two-way data?
A)Integrated services digital networks
B)Voice frequency channels
C)Computer networks
D)Cable modems
Q2) What was the system originally called that was developed in the early 1970s to link academic institutions and their researchers involved with military defense activities?
A)FireWire
B)Internet
C)ARPANET
D)Hypertext
Q3) Two or more LANs linked together within a limited geographical area is called a(n)_____________.
A)wide area network (WAN)
B)open systems interconnection (OSI)
C)metropolitan area networks (MAN)
D)asymmetric DSL (ADSL)
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Chapter 12: Transmission Lines
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Q1) What is the ratio of reflected voltage to incident voltages called?
A)Voltage standing-wave ratio
B)Reflection coefficient
C)Return loss
D)Standing wave
Q2) The resistance of any conductor is never zero _________.
A)ohms
B)voltage
C)current
D)impedance
Q3) What are circuits called that convert between balanced and unbalanced operation?
A)Power-sum
B)Coaxial
C)Baluns
D)Dielectric
Q4) What is one the most useful properties of the Smith chart?
A)Its ability to solve impedance-matching problems.
B)It is an easy measure indication of the severity of mismatch.
C)It exhibits properties of inductance and capacitance.
D)It can determine the effects on impedance of changes to component values.
Page 14
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Chapter 13: Wave Propagation
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Q1) What is it called when the azimuth and elevation angles for the Earth station antenna must be calculated so that the correct satellite can be seen?
A)GPS
B)Look angle
C)Footprint
D)Frequency-division multiple access
Q2) The highest frequency that is returned to Earth when transmitted vertically under given ionospheric conditions is called the ____________.
A)critical angle
B)maximum usable frequency
C)critical frequency
D)optimum working frequency
Q3) Which of the following is (are)the result of the interaction of changing electric and magnetic fields?
A)Satellite communication
B)GPS satellites
C)Wave propagation
D)Radio waves
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15
Chapter 14: Antennas
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Q1) The monopole antenna is used primarily with frequencies below __________.
A)2 MHz
B)100 MHz
C)50 MHz
D)55 MHz
Q2) What type of antenna is found in repeater installations for two-way radio applications?
A)Phased array
B)Yagi-Uda
C)Broadside array
D)Collinear
Q3) Which of the following consists of a structure made of wire erected a short distance above the ground and insulated from the ground?
A)Loading coil
B)Counterpoise
C)Feed line
D)Transducer
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Chapter 15: Waveguides and Radar
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Q1) Which of the following is one of the original and still most widely used applications for waveguide?
A)FM broadcasting
B)Radar installations
C)Transmission lines
D)AM broadcasting
Q2) In what form does energy propagate down a waveguide?
A)Radio signal
B)Magnetic field
C)Radar pulse
D)Doppler radar
Q3) 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
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Page 17
Chapter 16: Fiber Optics
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Q1) What portion of the fiber strand carries the transmitted light?
A)Cladding
B)Core
C)Protective jacket
D)Couplings
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) Why is plastic fiber only used in short lengths in industrial applications?
A)Signal losses
B)Abrupt changes in the refractive index
C)High attenuation
D)Variable path lengths
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