7/27/2019 Microwave and Optical Communicaion Lab

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MICROWAVE AND OPTICAL COMMUNICAION LAB

POSSIBLE VIVA QUESTIONS

MICROWAVE QUESTIONS

1. Is Reflex klystron an oscillator or an amplifier?2. What are the types of Reflex klystron?3. Give the application of Reflex Klystron?4. Mention the modulation technique adopted in Reflex klystron? 5. Differentiate beam andrepellar voltage6. What are the different modes available in Reflex klystron?7. A Gunn diode is based on which effect.8. What is meant by negative resistance region of Gunn diode?9. What is meant by saturation region in Gunn diode?10. Give the application of E plane Tee?11. Give the name of a microwave device which is a three port divider which splits thepower in phase with each other

12. Give the name of a microwave device which is a three port divider which splits thepower out of phase.13. Give the name of a microwave device which is a three port divider which splits thepower in phase and out of phase.14. What is meant by radiation pattern?15. Differentiate Sectorial E and Sectorial H horn16. What is meant by pyramidal horn antenna.17. Give the relation between ?o, ?g and ?c for TE10 mode rectangular wave guide.18. Give the frequency specifications of Klystron tube oscillator.19. The Gun oscillator is based on which effect20. The Cavity dimension of the Gun diode depends on which frequency.21. On which modulation technique does the pin modulator works.22. What are the lobes present in an antenna pattern23. Mention the name of the device which is a combination of E & H plane tee.

24. Give the name of the device which acts as power spliter25. Give the name of a device which splits the power out of phase26. Give the basic parameters to be measured for magic tee.27. What is the purpose of an Isolator28. Give the range for beam voltage for reflex Klystron power supply29. Give the range for reflector voltage.30. What is the purpose of using a heater tube in a reflex klystron.31. Give the scattering matrix for E / H Plane tee.32. Give the scattering matrix for Magic tee.

FIBER OPTICS

1. Give the Characteristics of LED?

2. What is numerical aperture?3. What are the LED wavelengths used in lab?4. What are the losses in OFC?5. What is meant by micro bending loss?6. What is meant by Macro bending loss?8. What is meant by the term critical angle?9. What is refractive index?10. What is the acceptance angle?12. Give advantage of fiber optic system?13. On which characteristics does the mode in the optical fiber depend?

7/27/2019 Microwave and Optical Communicaion Lab

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14. What are the different types of fiber optic transmission?15. What is the advantage of using single mode fiber?16. What is the advantage of using multimode fiber?17. What are the wave lengths of the LEDs used in a optic trainer kit?

18. Give the names of the photo detector?19. On which modulation technique does optic fiber communication take place?20. Give the principle of operation of fiber optics?

21. State snells law of refraction?22. Differentiate Step and Graded index fiber?23. What are the possible losses in optic fiber?24. Give the formula for finding attenuation?

25. What is meant my Intensity Modulation?26. How the propagation loss is calculated for an optic fiber?27. How the bending loss is determined for an optical fiber?28. What are the considerations taken for Numerical aperture measurement?29. What is the purpose of Connectors and splices in an optical link?30. Give the wave length for an infra red LED?31. Give the wave length for a visible LED?