My Profile
Active Members
TodayLast 7 Days
more...
Awards & Gifts
Online Exams
Fresher Jobs
Our fresher job section is exclusively for fresh graduates! Find jobs for freshers in major Indian
cities including Bangalore, Chennai, Hyderabad, Pune or Kochi
Resources
Find educational articles, blogs, discussion threads and other resources.
Colleges
Find details about any college in India or search for courses.
|
Download Model question papers & previous years question papers
|
Posted By: sunil Member Level: Diamond Posted Date: 23 Jun 2008
|
2008 III B.Tech II Semester Regular Examinations, Apr/May 2008 MICROWAVE ENGINEERING Question paper
|
|
|
Code No: R05320403
Set No. 1
III B.Tech II Semester Regular Examinations, Apr/May 2008
MICROWAVE ENGINEERING
( Common to Electronics & Communication Engineering and Electronics &
Telematics)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. (a) Derive the expression for guide wave length of TEmn mode in rectangular
wave guide.
(b) What are the advantages of dominant mode propagation?
[8+8]
2. (a) What are TEnmand TMnmmodes w.r.t a circular wave guide. Sketch the
dominant modes.
(b) A cylindrical wave guide has a inner radius of 2 cm. Find the cut o? frequency
for the guide operating in TE11mode. Calculate ? g and ZT Eat 10 GHz (?0
= 3 cm).
3. Write short notes on:
(a) Wave guide Irises
(b) Rat ? Race hybrid
(c) Dielectric phase shifters.
4. (a) Explain the characteristics of ferrite materials.
[8+8]
[16]
(b) Derive the S - matrix for 4 port directional coupler when the coupling factor
is 3dB.
5. (a) A re?ex klystron operates under the following conditions:
V0= 600v, I0= 11.45mA, L = 1mm.
Rsh= 15k - 2, fr= 9GHZ.
The tube is oscillating at frat the peak of n = 134 mode.
Assume ß1
i. The microwave gap voltage.
ii. Repeller Voltage for the mode 1 3
4.
[8+8]
(b) Draw the equivalent circuit of re?ex klystron & explain about the electronic
admittance of it.
[8+8]
6. (a) A helix travelling wave tube is operated with a Beam current of 300mA, beam
Votage of 5KV, characteristic Impedance of 20O. What length of helix will be
Selected to give an output power gain of 500db at 10GHz.
(b) Explain the construction & working of TWT.
[8+8]
7. (a) Derive the criterion for classifying the modes of operation for Gunn e?ect
diodes
1 of 2
Code No: R05320403
Set No. 1
(b) An n-type GaAs Gunn diode has following parameters
Electron drift velocity Vd= 2.5 × 105m/s
Negative Electron mobility |n| = 0.015 m2/ v s
Relative dielectric constant er= 13.1
Determine the criterion for classifying the modes of operation.
[8+8]
8. (a) How are microwave measurements di?erent from low frequency measurements.
(b) What is the average power of a periodicwave if the peak power is 1300 W and
the pulse width is .56 and periodic frequency of the wave is 1500 Hz. [8+8]
Return to question paper search
|
|
|
Submit Previous Years University Question Papers and make money from adsense revenue sharing program
Are you preparing for a university examination? Download model question papers
and practise before you write the exam.
|
Watch TV Channels
Watch Asianet TV onlineKairali TV in InternetSurya TV onlineAmritha TV Channel
|