Download GTU BE/B.Tech 2019 Summer 7th Sem Old 171001 Microwave Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem Old 171001 Microwave Engineering Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (OLD) EXAMINATION ? SUMMER 2019
Subject Code: 171001 Date: 21/05/2019

Subject Name:Microwave Engineering

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Discuss advantages of microwave frequencies over lower frequencies; also
explain some areas of microwave application.
07
(b) Define the following terms
i) TEM wave, ii) TE wave, iii) TM wave, iv) HE wave, v) Characteristic
Impedance, vi) Reflection coefficient, vii) Input impedance.
07

Q.2 (a) Explain the working principle of ?Magic Tee? in detail with S-matrix and neat
diagram.
07
(b) Determine the cut-off wavelength for the dominant mode in a rectangular
waveguide of breadth 10 cm. For a 2.5 GHz signal propagated in this waveguide
in the dominant mode; Calculate the guide wavelength, the group and the phase
velocities.
07
OR
(b) A two cavity Klystron amplifier has the following parameters.
Beam voltage: Vo = 900 V, Beam current: Io = 30mA, Frequency: f= 8 GHz,
Gap spacing in either cavity: d= 1 mm, Spacing between centers of cavities: L=
4 cm, Effective shunt impedance: Rsh = 40k?. Determine,
i) The electron velocity, ii) The d.c. electron transit time, iii) The input
voltage for maximum output voltage, iv) The voltage gain in decibels.
07

Q.3 (a) Explain functioning of four ports circulator with neat schematic diagram. 07
(b) Describe working principle of Helix Travelling Wave Tube with neat diagram. 07
OR
Q.3 (a) Explain operational principle, V-I characteristics, construction, advantages and
disadvantages of IMPATT diode with neat diagram.
07
(b) Describe all the characteristics of Smith chart. 07

Q.4 (a) Write a short note on Varactor diodes. 07
(b) Derive three expressions for maximum radar range, Rmax. 07
OR
Q.4 (a) Draw and explain block diagram of ?Pulsed Radar System?. 07
(b) Prove that reflection coefficient(?) is dependent on characteristic impedance
(ZO) and load impedance ( ZL),also specify how their different values affects ?.
07

Q.5 (a) Explain function of cylindrical magnetron with neat diagram. 07
(b) Describe MTI Radar functions with neat block diagram. 07
OR

Q.5 (a) Explain various radar display methods with neat diagram. 07
(b) Derive an expression for characteristics impedance and quality factor of
microwave strip lines.
07

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