MU Electronics Engineering (Semester 3)
Circuit Theory
May 2013
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Explain Y-parameter in terms of Z-parameters
5 M
1 (b) Draw the dual of the network shown in figure (a)
5 M
1 (c) Find the poles and zeros of impedance of the network shown in figure (c)
5 M
1 (d) State the properties of prf
5 M

2 (a) Find the Thevin equivalent network of figure (c)
10 M
2 (b) Find the current I2 using mesh analysis of figure (d)
10 M

3 (a) The switch is closed at t=0, find values of I, dI/dt , d2I/dt2 at t=0+. Assume all initial current of inductor to be zero for circuit (e)

10 M
3 (b) Calculate the twig voltage using KVL equations for network shown in figure (f)
10 M

4 (a) Determine Y-parameter for network an figure (g)
10 M
4 (b) In the network figure (h). Determine the currents i1(t) and i2(t) when the switch 'k' is closed at t=0

10 M

5 (a) The pole-zero diagram of driving point impedance function of network figure (i). At d.c. the input impedance is resistive and equal to 2?. Determine the values of R-L and C

10 M
5 (b) Test whether the following polynomial are Hurwitz. Use continuous fraction expansion method :-
(i) s4+2s2+2
(ii) s7+2s6+2s5+s4+4s3+8s2+8s+4
10 M

6 (a) Determine the node voltage at 1 and 2 of the network shown in figure (f). Use nodal analysis

10 M
6 (b) Find the response of V0 (t) for network shown in figure (k)

10 M

7 (a) Realize the given expression in Foster I, Foster II, Cauer-I and Cauer-II form
$z\left(s\right)=\frac{s\left(s+4\right)\left(s+8\right)}{\left(s^2+7s+6\right)}$
20 M

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