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Reg
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
Course Code: EE201
Course Name: CIRCUITS AND NETWORKS
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 5 marks Marks
1 Stat and explain reciprocity theorem.
2 Write down the properties of incidence matrix.
3 If an RLC series circuit is energised by a 10V DC source at t=0 sec. Draw the
expected graph of the following circuit variables under different damping
conditions:
The current through the circuit ii) Voltage across the capacitor.

4 Find the current through circuit shown in Fig. 1.

5 Derive the condition for symmetry and reciprocity of Y-parameters.
6 What is h-parameters? Why they are called hybrid parameters?
7 What is the differentiate between network analysis and synthesis.
8 State the properties of LC driving point immittance function.
PART B
Answer any two full questions, each carries 10 marks
9 For the circuit shown in Fig. 2 find the value of RL that absorbs maximum
power from the circuit and the corresponding power under this condition.

10 For the network shown in Fig. draw the oriented graph, write the tie-set
schedule and hence obtain the equilibrium equations on loop basis. Calculate the
values of branch current and branch voltages.

Figure 1
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Figure 2
11 Draw the Norton's equivalent circuit and Thevenin's equivalentcircuit of
Fig. 4.

Obtain basic cutset matrix for the oriented graph shown in Fig. 5. Take as
twigs.

PART C
Answer any two full questions, each carries 10 marks
12 For the circuit shown in Fig.6 the DPDT switch at position 2 for a long time.
At t=0 sec. contact is moved from position 2 to 1 andat 10 sec. the contact is
moved from 1 to 2. Derive a expression for the and in both cases.
Plot variation of and vC(t).

Figure 4 Figure 5
Figure 6
Figure 3
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13 Find the expression for the current through the inductor in a parallel RLC
(three branch) circuit when a step input of I amperes is applied across it at time
t 0. Assume all initial conditions are zero. Apply Laplace transform technique.

14 The switch S in the circuit of Fig. 7 is in the closed position for long time. At
the switch opens. Find the expression for the current using Laplace
transform.

PART D
Answer any twofull questions, each carries 10 marks
15 Obtain the z parameters for the network in Fig. 8 as functions of s.
16 The parameters of a two port network are Z11= 10Ω, Z22=15Ω, Z12=Z21=5Ω.
Find the equivalent T-network and ABCD parameters

Test whether the polynomial is Hurwitz
17 Point out the difference in the philosophy between Foster and Cauer form of
synthesis of a given driving point impedance

The driving point impedance of a circuit is

2
2 2



s s
Z s s s
Realize the given impedance function Z(s)as a Cauer's first form.


Figure 8
Figure 7