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2003 Course Advanced Communication Eng.

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Total No. of Questions : 12] P1482 [Total No. of Pages :2 [3764] - 248 B.E. (Electronics) ADVANCED COMMUNICATION ENGINEERING (2003 Course) (404205) 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) 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) State and explain the principle of operation of helix traveling wave tubes. [8] OR 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 centers of two holes of two hole directional coupler. Explain how the wave energy is Propagating through it. [8] Q3) a) State the characteristics of IMPATT Diodes. What do you understand by the term Negative Resistance ? [8] b) With the help of Voltage and Current waveforms explain the principle of operation of TRAPATT diodes. [8] OR Q4) a) What is Gunn Effect ? State the microwave generation and amplification using Gunn Diode. [8] b) State the physical structures and principle of operation of microwave transistors. [8] P.T.O.

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