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Pune University - Sem - II : Applied Electromagnetics, RF, April 2010 (Old Course)

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Total No. of Questions : 5] [Total No. of Pages : 2 P1162 [3729]- 21 M.Sc. (Sem. - II) ELECTRONIC SCIENCE EL2 UT 03 : Applied Electromagnetics, RF, Microwave (Old Pattern) Time : 3 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Use of non-programmable calculator is allowed. 3) Draw a neat diagram wherever necessary. Q1) Solve any two : [Max. Marks : 80 [2 8 = 16] a) State Helmoltz equation. Explain how it can be solved to determine electromagnetic wave propagation. b) With the help of neat diagram explain the principle of tunnel diode and discuss its I-V characteristics. c) An X-band pulsed magnetron has the following operating parameters. Anode voltage Vo = 5.5kV, Beam current Io = 4.5Amp, operating frequency f = g GHz, Resonator conductance Gr = 2 10 4 mho, loaded conductance Gl = 2.5 10 5 mho, vane capacitance, C = 2.5 pF. Duty cycle DC = 0.002, power loss : P loss = 18.50kW. Compute : i) Angular resonant frequency. ii) Unloaded quality factor. iii) Loaded quality factor. iv) External quality factor. Q2) Solve any two : [2 8 = 16] a) With the help of neat diagrams explain parabolic-reflector antenna, dielectric lens antennas and metal lens antennas in detail. b) What is axon? Explain with the help of a typical neuron showing details. Draw a equivalent circuit of oxan transmission and explain it in detail. c) Starting from Maxwell s equation, determine the electric and magnetic wave equations. P.T.O.

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Additional Info : M.Sc. - I Electronic Science, EL1 UT 03 : Applied Electromagnetics, RF & Microwave (Old Course) (Semister - II), Pune University
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