Download GTU BE/B.Tech 2019 Summer 7th Sem New 2171001 Microwave Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 2171001 Microwave Engineering Previous Question Paper

Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2171001 Date:10/05/2019

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.




MARKS

Q.1 (a) List the microwave frequency bands. 3

(b) How microwave signals and systems are different than other low
frequency signals and systems?
4

(c) Explain the necessity of impedance matching and methods to
perform impedance matching.
7

Q.2
(a) A 75? transmission line that is half wavelength long is terminated in
a load resistance of 300?. Determine its input impedance.
3

(b) Explain the waveguide parameters (a) cut-off wavelength (b) guide
length
4

(c)

Derive transmission line equations and also derive solution of
transmission line equation.
7
OR
(c) Explain the construction and applications of smith chart. 7

Q.3 (a) Draw the different type of modes in waveguides. 3

(b) Explain the waveguide parameters : group and phase velocities,
characteristic wave impedance.
4

(c) Find all possible modes that will propagate in a rectangular
waveguide having cross-sectional dimensions of 4cm ? 2 cm. the
operating frequency is 5GHz.
7
OR
Q.3 (a) Compare transmission lines with waveguides. 3
(b) Write short note on scattering parameters. 4

(c) Draw diagram of E-plane Tee junction and derive s-parameter matrix
for the same.
7

Q.4 (a) Explain directional coupler parameters. 3
(b) Write a short note on Varactor diode. 4
(c) Write short note on tunnel diode. 7
OR
Q.4 (a) Define Q-factor of a cavity resonator. 3
(b) Write short note on isolators. 4
(c) Define Klystron. Write short notes Two Cavity Klystron. 7

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Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2171001 Date:10/05/2019

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.




MARKS

Q.1 (a) List the microwave frequency bands. 3

(b) How microwave signals and systems are different than other low
frequency signals and systems?
4

(c) Explain the necessity of impedance matching and methods to
perform impedance matching.
7

Q.2
(a) A 75? transmission line that is half wavelength long is terminated in
a load resistance of 300?. Determine its input impedance.
3

(b) Explain the waveguide parameters (a) cut-off wavelength (b) guide
length
4

(c)

Derive transmission line equations and also derive solution of
transmission line equation.
7
OR
(c) Explain the construction and applications of smith chart. 7

Q.3 (a) Draw the different type of modes in waveguides. 3

(b) Explain the waveguide parameters : group and phase velocities,
characteristic wave impedance.
4

(c) Find all possible modes that will propagate in a rectangular
waveguide having cross-sectional dimensions of 4cm ? 2 cm. the
operating frequency is 5GHz.
7
OR
Q.3 (a) Compare transmission lines with waveguides. 3
(b) Write short note on scattering parameters. 4

(c) Draw diagram of E-plane Tee junction and derive s-parameter matrix
for the same.
7

Q.4 (a) Explain directional coupler parameters. 3
(b) Write a short note on Varactor diode. 4
(c) Write short note on tunnel diode. 7
OR
Q.4 (a) Define Q-factor of a cavity resonator. 3
(b) Write short note on isolators. 4
(c) Define Klystron. Write short notes Two Cavity Klystron. 7


Q.5

(a)
A certain microstrip line has the following parameters: ?r = 5.23, h =
7mm, t = 2.8mm, w = 10mm. Calculate the characteristic impedance
z0 of the line.
3

(b) Write the applications and advantages of microwave solid state
devices.
4
(c) Explain Electromagnetic Interference and Microwave Imaging. 7
OR
Q.5

(a)
An n-type GaAs Gunn diode has electron density of 10
18
cm
-3
,
temperature of 300
0
K, electron density at lower valley is 10
10
cm
-3

and electron density at upper valley is 10
8
cm
-3
. Determine the
conductivity of the diode. Take ?l = 8000 cm
2
/V-sec and ?u= 180
cm
2
/V-sec.
3
(b) Explain the Gunn effect. 4
(c) Describe Microwave RADAR system. 7



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