SRM University 2007 B.Tech Electronics and Communications Engineering Bank : Microwave and Optical Communications - Question Paper

3. What is the function of a cavity Resonator?
4. How the 2 cavity Klystron acts as an oscillator?
5. What are the modes of Reflex Klystron?
6. Draw the applegate diagram of Reflex Klystron.
7. What is meant by Hull Cutoff Voltage?
8. What is a Magnetron?
9. What are the advantages of Travelling Wave Tube?
10. What is the use of attenuator in TWT?
11. How a Gunn Diode act as an oscillator?
12. Draw the basic set up of microwave bench.
13. What are the sensors used for power measurements?
14. What is the use of slotted line part in microwave Bench?
15. What are the modes of Gunn Oscillator?
16. What are the differences ranging from klystron amplifier and TWT amplifier?
17. Draw the microwave bench set up for the measurement of coupling factor and directivity.
18. Draw a multicavity Klystron Amplifier and discuss its advantages.
19. What is the use of helix in TWT?
20. What are slow wave structures?
21. What is the need for termination?
22. What is Faraday Rotation? provide a few examples of ferrite devices.
23. Distinguish ranging from Thermistor and Baretter?
24. What is Transit Time?
25. Define Phase focusing effect.
Part-B
1. Explain the operation of Klystron amplifier and derive its efficiency.
2. Explain in detail the operation of Reflex Klystron and derive its efficiency.
3. Explain the operation of magnetron and derive its Hull Cuttoff voltage formula.
4. Explain the operation of TWT and derive its gain. provide its characteristics and applications.
5. Explain the modes of operation of Gunn Oscillator.
6. Explain in detail the measurement of S-Parameters.
7. What are the various methods of power measurements and discuss.
8. How will you measure frequency and wavelength of microwaves ?
9. Explain in detail the measurement of impedance using microwave bench.
10. Explain the measurement of coupling factor and directivity of directional coupler.

Unit-III – Introduction to Optical Fiber
Part-A
1. What is the basic principle behind optical transmission?
2. Draw the structure of an optical fiber.
3. What is the need for Cladding?
4. What is an external and internal reflection?
5. What is a step-index fiber? Sketch its RI profile.
6. What is a graded index fiber? Sketch its RI profile
7. Define fiber attenuation.
8. What are the causes for absorption?
9. What are the kinds of bends?
10. What is meant by group velocity dispersion?
11. What are the causes for intramodal dispersion?
12. What is meant by modes of a waveguide?

Earning:   Approval pending.