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1997 Course Radiation & Microwave Techniques

2 pages, 26 questions, 0 questions with responses, 0 total responses,    0    0
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Total No. of Questions : 10] [Total No. of Pages : 2 [3664] - 26 P 1338 B.E. (E & TC) RADIATION & MICROWAVE TECHNIQUES (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) What are the advantages of waveguide over coaxial cable at microwave frequency? Explain the method to excite dominant mode in the waveguide from microwave source. [8] An air filled rectangular waveguide of inside dimensions (7 x 3.5)cm [8] operates in the dominant mode TE10 i) Find the cut-off frequency. ii) Determine phase velocity of wave in the guide at 3.5 GHz. iii) Find guided wavelength at 3.5 GHz. iv) Calculate group velocity at same frequency. Why S parameters are preferred at microwave frequency? Explain two hole directional coupler and give S parameters of it. [8] Explain principle of ferrite rotation. Explain isolator & give its S parameters. [8] Q3) a) b) Explain principle of working of a cavity Magnetron. [8] Explain velocity moduation & electron bunching in Klystron amplifier. [8] Q4) a) Explain working of circulator using Magic Tee. Give scattering matrix of three port circulator. [8] Explain the role of directional coupler in a typical laboratory microwave bench. Define coupling factor, directivity & isolation for the same. [8] b) P.T.O.

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