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1997 Course Microwave Techniques

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Total No. of Questions : 10] P1182 [Total No. of Pages : 2 [3664]-53 B.E. (Electronics) MICROWAVE TECHNIQUES (1997 Course) (404205) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. SECTION - I Q1) 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] Q2) a) Draw a neat sketch of E-plane tee, H-plane tee and magic tee. Write S parameter matrix of each. [8] b) Draw a neat sketch of Directional Coupler . State the spacing between the Centres 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 two-cavity klystron amplifier. [8] b) What is GUNN EFFECT ? State the microwave generation and amplification using Gunn diode. [8] Q4) a) State and explain the principle of operation of helix traveling wave tubes. [8] b) State the physical structures and principle of operation of microwave Transistors. [8] P.T.O. Q5) Write short notes on any three of the following : a) PULSED RADAR SYSTEM. [18] b) PLAN_POSITION INDICATOR. c) TV RELAY. d) LENS ANTENNA. e) CASSEGREIN FEED. SECTION - II Q6) a) With the help of block diagram explain the working of CW Radar. [8] b) What is DOPPLER EFFECT? Where and how is it used? Q7) a) Explain use of Microwave in health care. [8] [8] b) Explain the terms Synchronous Orbit , Polar Orbit , Inclined Orbit .[8] Q8) a) State and define any three antenna parameters. b) State the principle of operation of reflector antenna. Q9) a) State the difference between Aperture antenna and Horn antenna. [8] [8] [8] b) Draw a block diagram of experimental setup of measurement of microwave. [8] Q10) Write short notes on any three of the following : a) MASERS. b) MAGNETRON. c) CAVITY RESONATORS. d) REFLEX KLYSTRON. e) MODES IN RECTANGULAR WAVEGUIDE. [3664]-53 2 [18]

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