Introduction to Electronic Communications Final Exam Questions
Course Introduction
This course offers a comprehensive overview of the fundamental principles and techniques of electronic communications. Students will explore the basics of signal transmission, modulation and demodulation, bandwidth, noise, and the essential components of communication systems. The course covers both analog and digital communication methods, introduces wireless and wired transmission technologies, and examines real-world applications such as radio, television, telephony, and the internet. Emphasis is placed on understanding how information is encoded, transmitted, and received, as well as the challenges involved in maintaining signal integrity. Suitable for those seeking a strong foundation in modern communication systems, this course combines theoretical concepts with practical applications.
Recommended Textbook
Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley
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Page 2
Chapter 1: Fundamental Communications Concept
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Q1) 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 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.
Answer: A
Q2) You are troubleshooting a piece of equipment and you find that unauthorized modifications may have been performed on the equipment.What type of failure does this situation represent?
A)Faulty
B)Complete
C)Induced
D)Poor system performance
Answer: C
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Chapter 2: Amplitude Modulation
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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) All information contained at the output of the AM modulator is contained within the
A)balanced modulators
B)bandwidth
C)transmitter
D)sidebands
Answer: D
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Page 4
Chapter 3: Angle Modulation
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Q1) What factor determines the amount of carrier frequency deviation?
A)Intelligence frequency
B)Changing frequency
C)Frequency components
D)Intelligence amplitude
Answer: D
Q2) All communications systems are constrained by_____________.
A)bandwidth availability
B)reference frequency
C)sound waves
D)absence of modulation
Answer: A
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Chapter 4: Communications Circuits
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Q1) What does the application of two different input frequencies produce?
A)Cross products
B)Power series
C)Mechanical vibrations
D)Frequency sensitivity
Q2) A__________ is where the currents in the diodes and the currents in the transistors are the same.
A)current mirror
B)push-pull
C)cutoff
D)conduction angle
Q3) Which of the following would be an application where a SAW filter would be used?
A)Miniaturized equipment
B)Radar systems
C)IF transformers
D)Single-sideband systems
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Chapter 5: Transmitters
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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) The ___________ amplifier provides a high-impedance load for the oscillator to minimize drift or undesired frequency shift as a result of circuit-loading effects.
A)final
B)intelligence
C)buffer
D)modulated
Q3) 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
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Chapter 6: Receivers
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Q1) What is one of the great advantages of the diode (envelope)detector?
A)75% efficiency obtainable
B)Distortion increases as amplitude decreases
C)Can handle low power signals
D)Simplicity
Q2) _______________ is the process of stepping down the RF signal to a first,relatively high IF frequency and then mixing down again to a second,lower,final IF frequency.
A)Deemphasising
B)Double conversion
C)Up-conversion
D)Suppression
Q3) ___________ are used in the vast majority of AM detection schemes where the carrier and sidebands are present.
A)Foster-Seeley discriminators
B)Ratio detectors
C)Diode detectors
D)FM discriminators
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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) The undesired byproduct of mixing is known as a(n)___________.
A)sine-wave
B)alias
C)pulse train
D)Nyquist rate
Q3) What is the chief disadvantage of analog communication?
A)Simplicity
B)Bandwidth requirements
C)Susceptibility to noise
D)Cost
Q4) What is the primary advantage of the flash ADC?
A)It uses little power.
B)It's simplicity.
C)It is inexpensive.
D)It is very fast.
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Chapter 8: Digital Modulation and Demodulation
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Q1) Where is minimum-shift keying (MSK)widely used?
A)Radios
B)Cordless phones
C)Military applications
D)Garage-door openers
Q2) The advantage of a differential phase-shift keying (DPSK)system is that_____________ is (are)not required.
A)carrier synchronizer
B)voltage-controlled oscillators
C)upper and lower sidebands
D)carrier recovery circuitry
Q3) 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
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Chapter 9: Telephone Networks
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Sample Questions
Q1) What type of effect does noise have on a signal?
A)Harmonic
B)Distorted
C)Additive
D)Amplified
Q2) What is the purpose of framing?
A)To maintain synchronization of the receiving equipment
B)To allow one computer to "speak" with another
C)To meet the increasing demands of data transmission
D)To separate two-wire subscriber loops into two-wire pairs for transmitting and receiving
Q3) Who provides the switch for the frame relay network?
A)Subscribers
B)FCC
C)Computer services
D)Commercial carriers
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11
Chapter 10: Wireless Communications Systems
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Q1) What causes Rayleigh fading,particularly in urban areas?
A)Receiver picks up transmitted signal from multiple paths
B)Issue of limited read distance
C)Equipment failure or unfavorable path conditions
D)Maximum range achievable varies inversely with frequency and data rate
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) A(n)______ radio system to make maximal use of scarce radio spectrum.
A)software-defined
B)trunked
C)available
D)compliant
Q4) What signaling format does WiMAX use?
A)MIMO
B)OFDM
C)DSP
D)IEEE
Page 12
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Chapter 11: Computer Communication and the Internet
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Q1) 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
Q2) Who originally developed the IEEE 1394 connection,which is a high-speed serial connection available for computers and peripherals?
A)Microsoft
B)FCC
C)Apple
D)IBM
Q3) 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
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Chapter 12: Transmission Lines
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Q1) A ___________ is created as the result of the instantaneous vector addition of the incident-wave amplitude with that of the reflected wave created as the result of impedance mismatch between the transmission line and the load.
A)flat line
B)wavelength
C)traveling wave
D)standing wave
Q2) 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
Q3) When current travels in a wire,what is created?
A)High frequencies
B)Electromagnetic field
C)Crosstalk
D)Increase in signal-transmission performance
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Chapter 13: Wave Propagation
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Q1) Where would tropospheric scatter provide reliable long-distance communication links?
A)Deserts
B)Small cities
C)Suburban areas
D)Metropolitan centers
Q2) Which of the following is used to provide a performance measure for different satellite Earth stations?
A)Uplink budget
B)Downlink budget
C)Satellite link budget
D)Figure of merit
Q3) What is the area called between the point where the ground wave is completely dissipated and the point where the first sky wave returns,no signal will be heard?
A)Skip zone
B)Skip distance
C)Critical angle
D)Ionosphere
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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 antenna is typically built right into the wings of aircraft?
A)Folded dipole
B)Slot
C)Phased array
D)Ferrite loop
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) In what form does energy propagate down a waveguide?
A)Radio signal
B)Magnetic field
C)Radar pulse
D)Doppler radar
Q2) 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
Q3) Transmission lines,antennas,and fiber optics are the commonly known means of
A)information-carrying capacity
B)high-frequency transmission
C)low-frequency transmission
D)electromagnetic waves
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Chapter 16: Fiber Optics
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Q1) What was developed in an effort to overcome pulse dispersion?
A)Step-index fibers
B)Commercial grade fibers
C)Graded-index fibers
D)Single-mode fibers
Q2) Which of the following advantages of optical communications is represented when the light in one glass fiber does not interfere with,nor is it susceptible to,the light in an adjacent fiber?
A)Elimination of crosstalk
B)Lower costs
C)Immunity to electrostatic interference
D)Lower signal attenuation
Q3) What type of network is currently the standard for the long-haul optical transport of telecommunications data?
A)Synchronous transport
B)Conventional
C)Coaxial cable
D)Synchronous optical
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