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2003 Course Advanced Communication Eng.

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Total No. of Questions : 12] P999 [Total No. of Pages : 2 [3664]-218 B.E. (Electronics) ADVANCED COMMUNICATION ENGINEERING (404205) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any three questions from each section. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. SECTION - I Q1) 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] OR Q2) 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 (TWT). [8] Q3) 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] OR Q4) a) State the characteristics of IMPATT Diodes. What do you understand [8] the term Negative resistance ? b) With the help of voltage and current waveforms explain the principle of operation of TRAPATT diodes. [8] P.T.O.

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