Osmania University (OU) 2007 B.E Electronics & Tele-Communication Engineering NETWORKS NAD TRANSMISSION LINES - Question Paper
Code No.: 4339/N
FACULTY OF ENGINEERING B.E. II/IV Year (ECE) II Semester (Main) Examination, April/May 2008
(New)
NETWORKS AND TRANSMISSION LINES Time : 3 Hours] [Max. Marks : 75
Answer all questions of Part A.
Ansujerfive questions from Part B.
Smith charts can be used.
Part A - (Marks : 25)
1. Derive the condition for reciprocity in terms of ABCD parameters. 3
2. Find n network for T network shown in fig. 1. 3
2Q 2.50
fig. 1
3 n
3. Show the two two port networks connected in series and in cascade. 2
4. Define insertion loss for the two port network. 2
5. 25SI line is terminated by 1002 load. What will be VSWR and reflection coefficient on the line? 3
6. Sketch the input reactance of a short circuited line for 0 < 1 < X as a function
of PI. 3
7. Find the Z for filter section shown in fig. 2. 3
lOmH
10mH
20pf
8. By sketching the reactance of series and shunt arms as a function of frequency, find the filter type and cut off frequency for fig. 2. 2
9. What do you understand by loading of line? What is the purpose of loading? 2
10. Explain the use of short and open stubs. 2
11. Find the y parameters of network in fig. 3.
10
1H
30
2F
-20
fig- 3
IF
12. {a) Show that ABCD matrices multiply to find overall ABCD matrix when
5
5
networks are connected in cascade.
(b) Design symmetrical T attenuator for RQ = 600Q and attenuation of 20dB.
13. (a) For a two port network show that .
Z0 = ,/Zscz and Tan hr =J '
V oc
Where Zq is charac. impedance and r is image transfer constant,
6
4
(b) For network of fig 4 find expression for cos h r where r is a + j(3.
Q-
ZI/2
HH-
Zi/2
fig. 4
14, Design composite filter for Rq = 6000, f, = 1000kHz and = 1200kHz. Filter should have low pass T sections. Sketch approx. attenuation characteristics for each section. 10
s + 2s + 6 s + 3
15. (a) Synthesize the function Z(s) =
(b) List the properties of positive real function. How will you test Hurwitz
polynomial? 5
16. (a) Show that for open circuited line of length 1, propagation const. 3 and charac. impedance Zq the input impedance is Zqc = jZQ cot (31. Sketch this function as a function of frequency. 7
(b) Find the length and charac. impedance of quarter wave transformer to match 500 line to 2000 load at 1GHz. 3
17. Write short notes on (any two) :
(a) Smith chart and its applications
(c) Equalizers.
10
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| Earning: Approval pending. |
