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Question Bank

The document is a question bank for the course 20EC215 – Microwave and Optical Communication, detailing questions across four modules: Microwave Network Analysis, Microwave Generators and Amplifiers, Microwave Measurements and Hazards of Microwave Radiations, and Optical Communication Systems. Each module contains both 3-mark and 15-mark questions covering key concepts, principles, and applications relevant to microwave and optical communication technologies. It serves as a study guide for students to prepare for examinations in these subjects.

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28 views2 pages

Question Bank

The document is a question bank for the course 20EC215 – Microwave and Optical Communication, detailing questions across four modules: Microwave Network Analysis, Microwave Generators and Amplifiers, Microwave Measurements and Hazards of Microwave Radiations, and Optical Communication Systems. Each module contains both 3-mark and 15-mark questions covering key concepts, principles, and applications relevant to microwave and optical communication technologies. It serves as a study guide for students to prepare for examinations in these subjects.

Uploaded by

sujjit004
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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20EC215 – Microwave and Optical Communication

Question Bank
MODULE I - MICROWAVE NETWORK ANALYSIS
3 Mark Questions:

1. List the applications of magic-Tee.


2. Compare E-plane Tee and H-plane Tee.
3. Define insertion loss.
4. Define return loss.
5. Define reflection loss.

15 Mark Questions

1. Explain the working principle of circulator and derive the S-matrix.


2. Derive the scattering matrix of an ideal directional coupler.
3. Derive the scattering matrix of an isolator.
4. Explain the limitations of Z, Y, ABCD and hybrid parameters in microwave networks
5. Derive the S-matrix for a multi-port network.
6. Determine the various properties of S-parameters.

MODULE II - MICROWAVE GENERATORS AND AMPLIFIERS

3 Mark Questions:

1. List the applications of reflex klystron.


2. Compare TWT and klystron amplifier.
3. Justify the reason for mentioning magnetron as cross field device.
4. State the purpose of slow wave structures in TWT.
5. List the modes of Gunn diode.
6. State any two applications of parametric amplifier

15 Mark Questions

7. Illustrate the amplifying mechanism in a helix traveling wave tube with supporting diagrams
and expressions.
8. Describe with the neat sketch the constructional details and principle of operation of a Reflex
Klystron tube. With the help of Applegate diagram illustrate the phenomena of bunching.
Derive the expression for bunched beam current and efficiency of Reflex Klystron.
9. Illustrate the construction and working of IMPATT and TRAPATT diodes.
10. Derive Manley - Rowe power relations and hence explain the parametric up converter.
MODULE III - MICROWAVE MEASUREMENTS AND HAZARDS OF MICROWAVE
RADIATIONS
3 Mark Questions:

1. Mention the purpose of slotted section with line carriage.


2. List the different types of Impedance measurement methods.
3. State the functions of network analyzer
4. List some application of spectrum analyzer.
5. Define EMC.

15 Mark Questions

1. Discuss the slotted line method of impedance measurement.


2. Explain how low VSWR can be measured using a microwave bench.
3. Discuss the methods of EMI control techniques in detail.
4. Explain the various coupling mechanisms that causes EMI
5. Explain the operation of Vector Network Analyzer with a neat block diagram.
6. Explain the operation of Spectrum Analyzer with a neat block diagram.

MODULE IV - OPTICAL COMMUNICATION SYSTEMS

3 Mark Questions:

1. A step index fiber has a normalized frequency V = 26.6 at 1300 nm wavelength. If the core
radius is 25 pm, find the numerical aperture
2. List the types of optical fiber losses.
3. State the importance of acceptance angle
4. Differentiate between mono-mode fiber and multi-mode fiber
5. Mention the need for population inversion in Laser diodes.
6. Draw the structures of edge-emitting LED and surface emitting LED.
7. Define responsivity of photodiode.

15 Mark Questions

1. Draw the structure and electric fields in the APD and explain its working.
2. Explain the various elements of an Optical Communication System with a block diagram.
3. Explain the evolution of Optical Communication System in detail.
4. With the help of a neat diagram, describe the construction and working of surface and edge
emitting LEDs.
5. Illustrate the field distribution patterns within the fiber based on the mode theory of circular
waveguides in detail.

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