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Microwave Engineering Question Paper - Dec 17 - Electronics And Communication Engineering (Semester 7) - Jawaharlal Nehru Technological University (JNTUH)
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Microwave Engineering - Dec 17
Electronics And Communication Engineering (Semester 7)
Total marks: 75
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Part-A
1.a.
Mention the application of waveguides
(2 marks)
00
1.b.
write short notes on power transmission and power losses of rectangular waveguide.
(3 marks)
00
1.c.
List of the functions of various waveguide components and their application
(2 marks)
00
1.d.
Explain any one application of magic tee
(3 marks)
00
1.e.
Classify microwave tubes
(2 marks)
00
1.f.
Differentiate two cavity klystron and reflex klystron
(3 marks)
00
1.g.
Explain RWH theory
(2 marks)
00
1.h.
Mention the applications of TED's
(3 marks)
00
1.i.
Explain the significance of scattering matrix
(2 marks)
00
1.j.
What is the need for an isolator in MW measurements and where it is placed?
(3 marks)
00
Part-B
2.a.
Explain why TEM mode does not exist in a circular wave guide.
(5 marks)
00
2.b.
What is the significance of Q in resonant circuits? Derive a general expression Q for a
series resonant circuit. What happens to Q when circuit is loaded?
(5 marks)
00
Or
3.a.
Show that TM01 and TM10 modes does not exist in a rectangular waveguide.
(5 marks)
00
3.b.
A rectangular wave guide with dimension of 8×4 cm operates in the TM11 mode at
10Ghz. Determine the characteristic wave impedance.
(5 marks)
00
4.a.
What is a cavity resonator? Discuss the applications of cavity resonator.
(5 marks)
00
4.b.
derive the expression for Q- factor of rectangular cavity
(5 marks)
00
Or
5.a.
Write a short note on
(5 marks)
00
I) waveguide phase shifter
5.b.
Write a short note on:
(5 marks)
00
I) hybrid ring
6.a.
Draw the mode curves of Reflex klystron and derive the relation between mode number
and repeller in Reflex klystron.
(5 marks)
00
6.b.
In a two-cavity klystron the parameters are, input power=10mW, voltage gain=20dB, Rsh
of input cavity =25KΩ, Rsh of output cavity =35KΩ, load resistance = 40 KΩ. Find input
voltage, output voltage and the power to the load.
(5 marks)
00
Or
7.a.
Explain the significance of slow wave structure in the amplification process. List out the
major differences between TWT and klystron
(5 marks)
00
7.b.
Explain how amplification takes place in helix TWT?
(5 marks)
00
8.a.
List and explain different types of magnetrons.
(10 marks)
00
Or
9.a.
With a neat sketch explain the structure and principle of operation of TWT amplifier.
(5 marks)
00
9.b
How is bunching achieved in a cavity magnetron? Explain.
(5 marks)
00
10.a.
Give the measurement procedure for measuring Q factor of resonant cavity.
(5 marks)
00
10.b.
Define VSWR. Describe the methods for measuring high and low VSWR’s.
(5 marks)
00
Or
11.a.
Explain the procedure for measuring VSWR<10.
(5 marks)
00
11.b.
Explain the procedure for measuring attenuation with neat diagram.
(5 marks)
00
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