Download GTU B.Tech 2020 Winter 7th Sem 2171001 Microwave Engineering Question Paper

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Subject Code: 2171001

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
Subject Name: Microwave Engineering
Time: 10:30 AM TO 12:30 PM

Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Define following : 1) VSWR 2) Characteristics impedance 3) Phase velocity [03]
(b) Write all properties of Smith chart. [04]
(c) Define Standing wave and derive equation of the voltage standing wave. Also find equations for the minimum and maximum amplitude and distance between any two successive maxima or minima. [07]

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Q.2 (a) Discuss the characteristics of TEM, TE and TM Mode. [03]
(b) Explain advantages of microwave and its applications. [04]
(c) Draw equivalent circuit of transmission line and derive basic equations for voltage and current on transmission line. [07]

Q.3 (a) Draw schematic of four port circulator and explain its working. [03]
(b) List the Medical and Civil applications of microwaves. [04]

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(c) Explain reflex klystron and it’s working with all necessary detail. [07]

Q.4 (a) Write the limitations and applications of TRAPATT diode. [03]
(b) Explain Effect of Microwaves on human body. [04]
(c) Explain the operation, construction and application of the IMPATT diode. [07]

Q.5 (a) Describe the applications of the parametric amplifier. [03]

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(b) A transmission line has following parameters R=2O/m G=0.5mho/m L=8nH/m C=0.23pF f=1GHz (Calculate the characteristic Impedance and the propagation constant. [04]
(c) Explain the construction-of four port circulator and derive its S-matrix. [07]

Q.6 (a) Write a note on Directional coupler with all necessary detail. [03]
(b) A lossless transmission line with characteristic impedance of 300 ohm is fed by a generator, with impedance 100 ohm. The line is 100 m long and is terminated by a resistive load of 200 ohm. Calculate the load reflection coefficient, VSWR, the transmission loss and the return loss. [04]
(c) Explain circular waveguide with necessary detail. [07]

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Q.7 (a) Discuss quality factor for a varactor diode. [03]
(b) Explain remote sensing system in detail. [04]
(c) Explain Basic Principal of “RADAR” draw and explain the block diagram of RADAR. [07]

Q.8 (a) Explain working of Traveling-wave tube. [03]
(b) Explain Microwave Antennas in detail. [04]

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(c) Explain Electromagnetic Interference and Microwave Imaging. [07]

Date: 19/01/2021
Total Marks: 56