GTU BE 2019 Summer Question Papers || Gujarat Technological University
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Seat No.:
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Subject Code: 2171001
Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
Subject Name: Microwave Engineering
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Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | List the microwave frequency bands. | MARKS |
| (b) | How microwave signals and systems are different than other low frequency signals and systems? | ||
| (c) | Explain the necessity of impedance matching and methods to perform impedance matching. | ||
| Q.2 | (a) | A 75O transmission line that is half wavelength long is terminated in a load resistance of 300O. Determine its input impedance. | |
| (b) | Explain the waveguide parameters (a) cut-off wavelength (b) guide length | ||
| (c) | Derive transmission line equations and also derive solution of transmission line equation. | ||
| OR | |||
| (a) | Explain the construction and applications of smith chart. | ||
| (b) | Draw the different type-of modes in waveguides. | ||
| (c) | Explain the waveguide parameters : group and phase velocities, characteristic wave impedance. | ||
| Q.3 | (a) | Find all possible modes that will propagate in a rectangular waveguide having cross-sectional dimensions of 4cm x 2 cm. the operating frequency is 5GHz. | |
| OR | |||
| (a) | Compare transmission lines with waveguides. | ||
| (b) | Write short note on scattering parameters. | ||
| (c) | Draw diagram of E-plane Tee junction and derive s-parameter matrix for the same. | ||
| Q.4 | (a) | Explain directional coupler parameters. | |
| (b) | Write a short note on Varactor diode. | ||
| (c) | Write short note on tunnel diode. | ||
| OR | |||
| (a) | Define Q-factor of a cavity resonator. | ||
| (b) | Write short note on isolators. | ||
| (c) | Define Klystron. Write short notes Two Cavity Klystron. | ||
| Q.5 | (a) | A certain microstrip line has the following parameters: εr =5.23, h= 7mm, t = 2.8mm, w = 10mm. Calculate the characteristic impedance Z0 of the line. | |
| (b) | Write the applications and advantages of microwave solid state devices. | ||
| (c) | Explain Electromagnetic Interference and Microwave Imaging. | ||
| OR | |||
| (a) | An n-type GaAs Gunn diode has electron density of 1016cm-3, temperature of 300°K, electron density at lower valley is 1016cm-3 and electron density at upper valley is 1014cm-3. Determine the conductivity of the diode. Take μ1 = 8000 cm2/V-sec and μ2= 180 cm2/V-sec. | ||
| (b) | Explain the Gunn effect. | ||
| (c) | Describe Microwave RADAR system. |
Date: 10/05/2019
Total Marks: 70
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