Exam Details
| Subject | microwave engineering | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
MICROWAVE ENGINEERING
(Electronics and Communication Engineering)
Date: 14 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Illustrate with expressions the solution for wave equations in rectangular wave guides in
TM mode.
9M
An air-filled rectangular waveguide of inside dimensions 7x3.5cm operates in the
dominant TE10mode as shown in the Fig.1.
Fig.1
i. Find the cutoff frequency
ii. Determine the phase velocity of the wave in the guide at a frequency of 3.5Ghz
iii. Determine the guided wavelength at the same frequency
6M
2. Starting from Maxwell's equation Illustrate with expressions the TE field equations
propagating inside rectangular wave guide.
9M
For TM modes calculate the average power transmitted through a rectangular waveguide.
6M
Unit II
3. With a neat diagram explain the E plane tee and illustrate with expressions the scattering
matrix.
8M
Illustrate the S matrix properties of Magic Tee. List the functions of Magic Tee.
7M
4. With a neat diagram explain the Directional Coupler and illustrate with expressions the
scattering matrix.
9M
A symmetric directional coupler with infinite directivity and a forward attenuation of 20db
is used to monitor the power delivered to a load ZL. Bolometer 1 introduces a VSWR of
2.0 on arm bolometer 2 is matched to arm 3. If bolometer 1 reads 8mW and bolometer
2 reads 2mW, find:
i. The amount of power dissipated in the load ZL
ii. The VSWR on arm 2
Fig.2
6M
Cont…2
2
Unit III
5. Explain the operation of Reflex klystron with constructional and Applegate diagrams. 9M
List three important differences between TWTA and Two cavity Amplifier.
6M
6. Illustrate with expressions the maximum efficiency of two cavity klystron. 7M
With a suitable diagram, explain the operation of Traveling Wave tube.
8M
Unit IV
7. With neat diagram explain LSA diodes. What are the limitations of LSA mode? 7M
List and explain three domain modes of Gunn oscillation mode.
8M
8. With neat schematic explain principle of linear magnetron. 7M
An X band pulsated cylindrical magnetron has the following parameters:
Anode voltage V0=26KV
Beam current Io=27A
Magnetic flux density Bo=0.336wb/m2
Radius of cathode cylinder=a=5cm
Radius of vane edge to center=b=10cm
Calculate:
i. Cyclotron angular frequency
ii. Cutoff voltage for fixed B0
iii. Cutoff magnetic flux density for a fixed V0
8M
Unit V
9. Explain the procedure for calculating the VSWR for S<20 using the microwave test bench.
Discuss the possible sources of errors in the measurement.
7M
Explain the procedures involved in measurement of cavity Q using:
i. Slotted Line
ii. Reflectometer
8M
10. Explain techniques commonly used for impedance measurement. 7M
What is VSWR? Discuss the measurements of low and high VSWR. 8M
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
MICROWAVE ENGINEERING
(Electronics and Communication Engineering)
Date: 14 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Illustrate with expressions the solution for wave equations in rectangular wave guides in
TM mode.
9M
An air-filled rectangular waveguide of inside dimensions 7x3.5cm operates in the
dominant TE10mode as shown in the Fig.1.
Fig.1
i. Find the cutoff frequency
ii. Determine the phase velocity of the wave in the guide at a frequency of 3.5Ghz
iii. Determine the guided wavelength at the same frequency
6M
2. Starting from Maxwell's equation Illustrate with expressions the TE field equations
propagating inside rectangular wave guide.
9M
For TM modes calculate the average power transmitted through a rectangular waveguide.
6M
Unit II
3. With a neat diagram explain the E plane tee and illustrate with expressions the scattering
matrix.
8M
Illustrate the S matrix properties of Magic Tee. List the functions of Magic Tee.
7M
4. With a neat diagram explain the Directional Coupler and illustrate with expressions the
scattering matrix.
9M
A symmetric directional coupler with infinite directivity and a forward attenuation of 20db
is used to monitor the power delivered to a load ZL. Bolometer 1 introduces a VSWR of
2.0 on arm bolometer 2 is matched to arm 3. If bolometer 1 reads 8mW and bolometer
2 reads 2mW, find:
i. The amount of power dissipated in the load ZL
ii. The VSWR on arm 2
Fig.2
6M
Cont…2
2
Unit III
5. Explain the operation of Reflex klystron with constructional and Applegate diagrams. 9M
List three important differences between TWTA and Two cavity Amplifier.
6M
6. Illustrate with expressions the maximum efficiency of two cavity klystron. 7M
With a suitable diagram, explain the operation of Traveling Wave tube.
8M
Unit IV
7. With neat diagram explain LSA diodes. What are the limitations of LSA mode? 7M
List and explain three domain modes of Gunn oscillation mode.
8M
8. With neat schematic explain principle of linear magnetron. 7M
An X band pulsated cylindrical magnetron has the following parameters:
Anode voltage V0=26KV
Beam current Io=27A
Magnetic flux density Bo=0.336wb/m2
Radius of cathode cylinder=a=5cm
Radius of vane edge to center=b=10cm
Calculate:
i. Cyclotron angular frequency
ii. Cutoff voltage for fixed B0
iii. Cutoff magnetic flux density for a fixed V0
8M
Unit V
9. Explain the procedure for calculating the VSWR for S<20 using the microwave test bench.
Discuss the possible sources of errors in the measurement.
7M
Explain the procedures involved in measurement of cavity Q using:
i. Slotted Line
ii. Reflectometer
8M
10. Explain techniques commonly used for impedance measurement. 7M
What is VSWR? Discuss the measurements of low and high VSWR. 8M
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