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1997 Course Microwave Eng. (Elective II)

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Total No. of Questions : 10] P1455 [Total No. of Pages : 2 [3764]-1037 B.E. (E & TC) MICROWAVE ENGINEERING (1997 Course) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) 2) Answer any three questions from each section. 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 makrs. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What is Scattering Matrix ? List any two properties of S-matrix. b) Derive the S-matrix for a typical three port microwave device. [8] [8] Q2) a) Explain the working of a PIN diode . List the characteristics and applications. [8] b) Why an isolator is always used in a microwave test bench? Explain the [8] operation of an isolator made out of a three port circulator. Q3) a) With neat and necessary diagrams, explain how a Varactor Diode works. What are the applications? [8] b) What is the principle of operation of a Tunnel Diode? Explain its construction, characteristics and application. [8] Q4) a) Write detailed notes on MESFETs by explaining the construction, performance characteristics & their applications. [10] b) Compare : Parabolic Antenna Vs Horn Antenna at Microwave frequencies? [6] P.T.O. Q5) Write short notes on any THREE : [18] a) Losses in waveguides. b) BALUN. c) Resonant cavity. e) Microwave tubes. d) Microwave filters. SECTION - II Q6) a) What is a MASER? Explain how it works? Highlight its performance and applications. [8] b) List and explain various Industrial and Medical Applications of microwaves. [8] Q7) a) Write notes on Doppler Effect and Blind Speeds in Radar. [8] b) What are various scanning and tracking methods used in Radars? List and explain them with neat diagrams. [8] Q8) a) Compare : klystron Amplifier Vs TWTA. [6] b) Derive the equation for maximum range of RADAR in terms of Pmin. What are the effects of noise over the above range? [10] Q9) a) Draw the block diagram of a typical hybrid microwave system for transmitting two audio and two video signal between a distance of 100 k.m. The communication system has a repeater also. Explain various aspects, frequency details and limitations in this regard. [8] b) Explain the block schematics and procedures to measure any two parameters that could be measured in an X-band microwave bench setup. [8] Q10) Write short notes on any THREE : a) Biological hazardous of microwaves. b) Solid state devices in microwave. c) Reflex klystron oscillator. d) Microwave antennas and arrays. e) Slotted section and its applications. rrrr [3764]-1037 -2- [18]

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