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1997 Course Microwave Techniques

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Total No. of Questions :10] [Total No. of Pages : 2 P1601 [3764]-1044 B.E. (Electronics) MICROWAVE TECHNIQUES (404205) (1997 Course) Time :3 Hours] [Max. Marks : 100 Instructions to candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. SECTION - I Q1) a) State and explain the principle of operation of two-cavity klystron amplifier. [8] b) What is GUNN EFFECT ? State the microwave generation and amplification using Gunn diode? [8] Q2) a) Draw a neat sketch of E-plane tee, H-plan tee and magic tee. Write S parameter matrix of each. [8] b) Draw a neat sketch of Directional Coupler . State the spacing between the centers of two holes of two hole directional coupler. Explain how the wave energy is propagating through it. [8] Q3) a) State and explain the principle of operation of helix traveling wave [8] tubes. b) State the physical structures and principle of operation of microwave Transistors. [8] Q4) a) With the help of voltage and current waveforms explain the principle of operation of TRAPATT diodes. [8] b) State the characteristics of IMPATT diodes. Explain the negative resistance. [8] P.T.O.

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