RF and Microwave Engineering
Exam Materials
Course Introduction
RF and Microwave Engineering is a specialized course focusing on the theory, design, and application of radio frequency (RF) and microwave circuits and systems. The course covers fundamental concepts such as electromagnetic wave propagation, transmission lines, waveguides, and Smith charts, as well as the behavior of passive and active components at high frequencies. Students learn about the design and analysis of devices like antennas, filters, amplifiers, and oscillators within the RF and microwave spectrum. Emphasis is placed on practical aspects including impedance matching, network analysis, S-parameters, and measurement techniques, preparing students to tackle real-world challenges in wireless communications, radar, and related fields.
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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Chapter 1: Fundamental Communications Concept
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Sample Questions
Q1) Why are bandwidths valuable?
A)Waveforms are limited.
B)Analog signals are digitized.
C)Wireless channels are impractical.
D)Frequencies are scarce.
Answer: D
Q2) What does the graphical display produced by an oscilloscope represent?
A)Signals in the frequency domain
B)Time-domain representation
C)Amplitude of each frequency component
D)Amplitude characteristics
Answer: B
Q3) The overall noise-intensity versus frequency curves for semiconductor devices would have what type of shape?
A)Angular
B)Square
C)Bathtub
D)Uneven
Answer: C
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Page 3
Chapter 2: Amplitude Modulation
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Sample Questions
Q1) The rate of phasor rotation is called angular _____________.
A)velocity
B)sidebands
C)sine waves
D)frequencies
Answer: A
Q2) A transmitter modulator circuit combines carrier and intelligence signals that are widely separated in _____________.
A)frequency
B)amplitude
C)harmonics
D)voltage
Answer: A
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4
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 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
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Page 5
Chapter 4: Communications Circuits
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Sample Questions
Q1) Resonance is the condition where inductive and capacitive reactances are
A)equal
B)reduced
C)increased
D)rejected
Q2) What does the application of two different input frequencies produce?
A)Cross products
B)Power series
C)Mechanical vibrations
D)Frequency sensitivity
Q3) Which of the following criteria would help you to choose the oscillator type for use in electronic circuits?
A)Input frequency required
B)Frequency stability required
C)Range of frequency output
D)Allowable waveforms
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6
Chapter 5: Transmitters
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Sample Questions
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) Which of the following prevents damage to the output circuits that may occur under unloaded conditions?
A)Spectrum analyzer
B)Dummy antenna
C)Balanced modulator
D)Single-sideband transmitter
Q3) The modulation process is accomplished in a(n)________________.
A)nonlinear device
B)linear devices
C)transmitter
D)amplifier
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Chapter 6: Receivers
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Sample Questions
Q1) What is created in a receiver with reception of electromagnetic interference (EMI)?
A)Undesired amplitude modulation
B)Variable sensitivity
C)Diode resistance
D)Distorted, unintelligible output
Q2) An essential function within any receiver is some form of ____________.
A)system noise ratio
B)sensitivity
C)dynamic range
D)automatic gain control
Q3) 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
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Chapter 7: Digital Communications Techniques
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Sample Questions
Q1) 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
Q2) Analog signals are quantized to the closest _________ value provided in the digitizing system.
A)waveform
B)bit
C)binary
D)pulse
Q3) 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
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Chapter 8: Digital Modulation and Demodulation
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Q1) Excessive _______ means that a receiver cannot differentiate one symbol from another.
A)noise
B)ISI
C)modulation
D)frequencies
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) 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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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) Who provides the switch for the frame relay network?
A)Subscribers
B)FCC
C)Computer services
D)Commercial carriers
Q3) What type of effect does noise have on a signal?
A)Harmonic
B)Distorted
C)Additive
D)Amplified
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Chapter 10: Wireless Communications Systems
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Sample Questions
Q1) _________is the reflection of radio waves striking the RFID tag and reflecting stored unique identification information back to the transmitter source.
A)Piconet
B)Frequency reuse
C)Slotted aloha
D)Backscatter
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
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12
Chapter 11: Computer Communication and the Internet
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Sample Questions
Q1) Which of the following has become a nearly universal high-speed serial communications interface?
A)IP telephony
B)xDSL
C)USB port
D)ASCII
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) 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)
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Chapter 12: Transmission Lines
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Sample Questions
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) 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) What type of cable must not be stepped on,crimped,or bent in too small a radius?
A)Coaxial
B)Flexible
C)Electrical
D)Solid dielectric
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14
Chapter 13: Wave Propagation
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Sample Questions
Q1) 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
Q2) What type of orbit do geostationary orbits use?
A)Equatorial orbit
B)Polar orbit
C)Inclined orbit
D)Subsatellite orbit
Q3) What type of diversity reception is comprised of two or more receiving antennas separated by 50 wavelengths or more?
A)Angle
B)Polarization
C)Frequency
D)Space
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Chapter 14: Antennas
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Sample Questions
Q1) What type of antenna is typically built right into the wings of aircraft?
A)Folded dipole
B)Slot
C)Phased array
D)Ferrite loop
Q2) What is the name of the portion of field energy that does collapse back into the antenna and is limited to the zone immediately surrounding the antenna?
A)Radiation
B)Far
C)Near
D)Induction
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) Why is a waveguide often pressurized with nitrogen?
A)To prevent contamination
B)To change the plane of polarization of the wave
C)To attach or weld a metal plate at the end of the waveguide
D)To prevent reflections
Q2) 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
Q3) What is the most popular shape of a waveguide?
A)Octagonal
B)Circular
C)Rectangular
D)Square
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Chapter 16: Fiber Optics
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Q1) Which of the following is a major criteria that affects the choice of fiber type?
A)Ease of interconnection
B)Size of light wavelength
C)Signal strength
D)Beamwidth
Q2) In which of the following would you find plastic fibers?
A)Long-haul telecommunications
B)Robotics
C)Data networks
D)Military applications
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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