II Semester M.Sc. Degree Examination, June 2015 (CBCS) ELECTRONIC SCIENCE ELC-202 : Microwave Devices and Circuits Time : 3 Hours
Max. Marks : 70
Instructions :11) Section – A : Answer all questions. Each question carries two marks. 2) Section – B : Answer any four full questions. SECTION – A 1. State Faraday’s and Ampere’s laws. 2. What is the difference between distributed and lumped networks ? 3. What is difference between TE and TM modes ? 4. What are the major differences between TWT and Klystron ? 5. Write down the important characteristics of Transferred Electron devices. (2×5=10) SECTION – B 6. a) State and explain the Poynting’s energy theorem.
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b) A certain transmission line has a characteristic impedance of 75 + j 0.01 Ω and is terminated in a load impedance of 70 + j 50 Ω . Calculate the reflection coefficient and transmission coefficient.
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c) Write down four basic rules for boundary conditions at the surface between two different materials.
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7. a) What is Smith Chart ? Explain. b) Describe the characteristic features of single stub and double stub impedance matching techniques in a given transmission line. c) An identical two-cavity Klystron amplifier operates at 4 GHz with V0 = 1KV, I0 = 22mA, cavity gap of 1 mm, drift space 3 cm. If dc beam conductance and catcher cavity total equivalent conductance are 0.25 × 10 – 4 mhos and 0.3 × 10 – 4 mhos respectively, calculate beam coupling coefficient. (5+5+5=15) P.T.O.
*PG430*
PG – 430 8. a) Obtain an expression for TE modes in rectangular waveguide. b) Give a brief account on hybrid coupler.
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9. a) With neat schematic diagram, explain the operating principle of Two-cavity klystron amplifier.
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b) Give brief account on high frequency limitations of conventional vacuum tubes.
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10. a) Describe the Physical structures and negative resistance effect of IMPATT diode. 10 b) Give a brief account on Ohmic losses in microstrip lines. 11. a) With an help of diagram, explain the working of CW Doppler radar system. b) Give a brief account on Microwave radiation hazards. _______________________
What are the major differences between TWT and Klystron ? 5. Write down the important characteristics of Transferred Electron devices. (2Ã5=10). SECTION â B.
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