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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

Solve any one question from Q.1(a,b) & Q.2(a,b)
1(a) State Thevenin theorem and find the equivalent circuit for the circuit shown below. Find the current through the (2+j2) Ω
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6 M
1(b) Consider the below circuit
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1) Draw the corresponding graph.
2) Obtain the complete incident matrix and reduced incident matrix.
3) Find the possible number of trees.
6 M

2(a) State Norton theorem and find the Norton's equivalent circuit across AB in circuit shown below.
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6 M
2(b) Explain the following term with example: 1) Tie set matrix
2) Incident matrix
3) Oriented graph.
6 M

Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a) Determine the expression for current flowing through the inductor (i(t)) of the circuit shown below
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6 M
3(b) A circuit consisting of a resistance of 4Ω and inductor of 0.5 H and a variable capacitor all in series connected across 100 V, 50Hz supply. At resonance calculate:
1) Capacitor
2) Voltage across the inductor
3) Q factor
4) Current in the circuit.
6 M

4(a) The circuit shown below. Find the expression for Vc(t) and ic(t). Initially the switch is open and at t = 0 is closed.
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6 M
4(b) Show that the value of capacitance for maximum voltage across the capacitor in case of series resonance circuit with capacitor tunning is given by: $C=\frac{L}{R^2+X^2_L}$
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6 M

Solve any one question from Q.5(a,b) & Q.6(a,b)
5(a) For symmetrical network. Derive the expression for Zoc, Zsc and Zo.
6 M
5(b) Eaxh of two series element of 'T' type LPF consists of an inductor of 60 mH and shunt element 0.2 μf capacitor . Calculate cut off frequency and design impedance at 1 kHz. Also find the ratio of phase difference between i/p and o/p voltages of the filter al 1 kHz and 5 kHz.
7 M

6(a) An attenuator is composed of symmetrical 'T' section having series arm of 175Ω each, and shunt arm 350 Ω. Findt the characteristic impedence and attenuation in dB.
6 M
6(b) Explain the 'm' derived filter and design 'T' and 'π' section of a prototype HPF having cutoff frequency of 20 kHz and design mpedance of 450 Ω also find the characteristic impedance at 25 kHz and attenuation at 4 kHz.
7 M

Solve any one question from Q.7(a,b) Q.8(a,b)
7(a) What is mean by network function? Explain various types of network functions for one port and two port network.
6 M
7(b) Find the 'Y' parameter of network shown below
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7 M

8(a) Find the 'Z' parameter of the network shown below.
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6 M
8(b) Derive the condition of Reciprocity and Symmetry for 'Y' parameters in '2' port network.
7 M

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