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Microwave Engineering Multiple Choice Questions | MCQs | Quiz

Microwave Engineering Interview Questions and Answers
Practice Microwave Engineering questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Lumped Circuit Model
•   Lossless Lines
•   Transmission Line Analysis
•   Co-axial Field Analysis
•   Terminated Lossless - 1
•   Terminated Lossless - 2
•   Smith Chart
•   Quarter Wave Transformer
•   Generator & Load Mismatch
•   Lossy Transmission Lines
•   TE, TEM & TM Waves
•   Parallel Plate Waveguide
•   Rectangular Waveguide
•   Circular Waveguide
•   Co-axial lines
•   Di-electric Sheet
•   Striplines
•   Micro-strip lines
•   Impedance & Admittance
•   Scattering Matrices
•   Transmission Matrix
•   Aperture Coupling
•   Slotted Lines Matching
•   Single Stub Matching
•   Double Stub Tuning
•   Quarter Wave Transformers
•   Reflections
•   Binomial Transformers
•   Chebyshev Transformers
•   Tapered Lines
•   Series Resonant Circuits
•   Line Resonators
•   Rectangular Waveguide
•   Circular Waveguide Cavity
•   Dielectric Resonators
•   Resonators Excitation
•   Divider & Coupler Properties
•   Power Dividers
•   Wilkinson Power Dividers
•   Hybrid Quadrature
•   Directional Couplers
•   Lange Coupler
•   180 Degree Hybrids
•   Other couplers
•   Ferrimagnetic Materials
•   Ferrite Isolators
•   Ferrite Phase Shifters
•   Ferrite Circulators
•   Micro-Wave circuits Noises
•   Noise Figure
•   Non-Linear Distortion - 1
•   Non-Linear Distortion - 2
•   PIN Diodes
•   Varactor Diodes
•   GUNN Diodes
•   IMPATT & BARITT Diodes
•   RF diodes Applications
•   Heterojunction BJT - 1
•   Heterojunction BJT - 2
•   Field Effect Transistors
•   Metal Oxide Semiconductor
•   Microwave integrated Circuit
•   Monolithic Microwave
•   Micro-wave Tubes
•   Two-port Power Gains
•   Stability Circles
•   Single Stage Transistor
•   Broadband Transistor
•   Power Amlifiers
•   Radiofrequency Oscillators
•   Crystal Oscillators
•   Microwave Oscillators
•   Resonator Oscillators
•   Oscillator Phase Noise
•   Frequency Multipliers
•   Transistor Multipliers
•   Antenas System Aspects
•   Antenna Gain & Efficiency
•   Wireless Communication
•   Digital Modulation
•   Receivers Characteristics
•   Radar Systems
•   Radiometer Systems
•   Antenna Basics - 1
•   Antenna Basics - 2
•   Antenna Family
•   Antenna Radiation

Best Reference Books

Microwave Engineering Books

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Microwave Engineering Questions and Answers – Quarter Wave Transformer(Smith Chart)

Posted on May 24, 2017 by Manish

This set of Microwave Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Quarter Wave Transformer(Smith Chart)”.

1. A quarter wave transformer is useful for matching any load impedance to a transmission line.
a) True
b) False
View Answer

Answer: b
Explanation: Quarter wave transformers are a simple circuit that can be used to match real load impedance to a transmission line. Quarter wave transformers cannot be used to match complex load impedances to a transmission line.
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2. Major advantage of a quarter wave transformer is:
a) It gives proper matching
b) It gives high gain
c) Broader bandwidth
d) None of the mentioned
View Answer

Answer: c
Explanation: Quarter-wave transformers can be extended to multi section designs in a methodical manner to provide a broader bandwidth.

3. If a narrow band impedance match is required, then more multi section transformers must be used.
a) True
b) False
View Answer

Answer: b
Explanation: If a narrow band impedance match is required, then a single section of quarter wave transformer is used. When a wideband impedance match is required, then multi-section quarter wave transformers must be used for impedance matching.

4. The major drawback of the quarter wave transformer that it cannot match complex load to a transmission line cannot be overcome.
a) True
b) False
View Answer

Answer: b
Explanation: The major drawback of the quarter wave transformer that it cannot match complex load to a transmission line can be overcome by transforming complex load impedance to real load impedance.
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5. Complex load impedance can be converted to real load impedance by:
a) Scaling down the load impedance
b) By introducing an approximate length of transmission line between load and quarter wave transformer
c) Changing the operating wavelength
d) None of the mentioned
View Answer

Answer: b
Explanation: By introduction of a transmission line of suitable length between the load and the quarter wave transformer, the reactive component of the load that is the complex value can be nullified thus leaving behind only real load impedance to be matched.

6. Converting complex load into real load for impedance matching has no effect on the bandwidth of the match.
a) True
b) False
View Answer

Answer: b
Explanation: Adding a length of line to the transmission line between the load and quarter wave transformer alters the frequency dependence of the load thus altering the bandwidth of the match.

7. If a single section quarter wave transformer is used for impedance matching at some frequency, then the length of the matching line is:
a) Is different at different frequencies
b) Is a constant
c) Is λ/2 for other frequencies
d) None of the mentioned
View Answer

Answer: a
Explanation: The length of the matching section is λ/4 for the frequency at which it is matched. For other frequencies, the electrical length varies. For multi section transformers, a wide bandwidth can be achieved.
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8. Quarter wave transformers cannot be used for non-TEM lines for impedance matching.
a) True
b) False
View Answer

Answer: a
Explanation: For non-TEM lines, propagation constant is not a linear function of frequency and the wave impedance is frequency dependent. These factors complicate the behavior of the quarter wave transformer for non-TEM lines.

9. The reactances associated with the transmission line due to discontinuities:
a) Can be ignored
b) Have to matched
C Discontinuities do not exist
d) None of the mentioned
View Answer

Answer: b
Explanation: Reactance due to discontinuities in the transmission line contribute to the impedance, they can be matched by altering the length of the matching section.

10. If a load of 10Ω has to be matched to a transmission line of characteristic impedance of 50Ω, then the characteristic impedance of the matching section of the transmission line is:
a) 50Ω
b) 10Ω
c) 22.36Ω
d) 100Ω
View Answer

Answer: c
Explanation: Characteristic impedance of the matching section of a transmission line is given by Z1=√Zₒ.ZL. Substituting the given impedance values, the characteristic impedance of the matching section is 22.36 Ω.

Sanfoundry Global Education & Learning Series – Microwave Engineering.
To practice all areas of Microwave Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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» Next Page - Microwave Engineering Questions and Answers – Reflections

« VLSI Questions and Answers – Limitations of Scaling -2
VLSI Questions and Answers – MOS Circuit Scaling – 1 »
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