Dr.A.P.J.Abdul Kalam University BE VII SEM ALL BRANCH Microwave Engineering [EC704] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Seventh Semester Main Examination, Dec-2020

Microwave Engineering [EC704]

Branch: EC

Time: 3:00 Hrs Max Marks 70

Note : 1. Attempt any five questions out of eight.

           2. All question carry equal marks.

Q.1 (a) What are waveguides? Explain the propagation of electromagnetic wave in a rectangular

waveguide.

(b) How do TEM and TE wave differ? Explain strip line and micro strip lines.

Q.2 (a) Explain the working of directional coupler. Derive its scattering matrix.

(b) Explain various modes of Gunn oscillators operation. What do you mean by Gunn effect?

Q.3 (a) Explain the principle of working of reflex klystron oscillator.

(b) Define the explain VSWR. Explain the double minimum method of measuring VSWR.

Q.4 (a) Write about Detector mounts with suitable diagram?

(b) Explain the principle of operation of E- plane Tee. Also write down its properties.

Q.5 (a) What do you mean by Rising sun cavity and strapping? Explain.

(b) Wrote short note on: (i) PIN Diodes (ii) Parametric Amplifier

Q.6 (a) Differentiate between planar and cylindrical magnetrons?

(b) What are ferrites? Why are these useful in microwave?

Q.7 (a) What is dominant mode and degenerate mode? What are the techniques for limitations of modes in a rectangular waveguide?

(b) Explain the working of TWT. Why does the TWT need a slow wave structure?

Q.8 (a) Explain how can the power of a microwave generator be measured using Bolometer.

(b) Explain TRAPATT and LASER.

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