Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 3rd Sem 3131707 Network Analysis Previous Question Paper

Seat No.: ________

Enrolment No.___________

**GUJARAT TECHNOLOGICAL UNIVERSITY**

**BE - SEMESTER? III EXAMINATION ? SUMMER 2020**

**Subject Code: 3131707**

**Date:04/11/2020**

**Subject Name: Network Analysis**

**Time: 02:30 PM TO 05:00 PM Total Marks: 70**

**Instructions:**

**1. Attempt all questions.**

**2. Make suitable assumptions wherever necessary.**

**3. Figures to the right indicate full marks.**

**Marks**

**Q.1 (a)**Define following terms: (a) Linear and Nonlinear Networks (b) Unilateral and

**03**

Bilateral Networks.

**(b)**Define following terms: (a) Time-Invariance and Time variance Networks. (b)

**04**

Active and Passive Networks with example.

**(c)**Explain ideal, practical and dependent voltage and current sources with all

**07**

necessary diagrams.

**Q.2 (a)**Determine the inductance between the terminals for a three coil shown in fig 1

**03**

**(b)**For the network shown in the fig 2, determine the numerical value of the branch

**04**

current i1 using sources transformation theorem.

**(c)**Determine the node voltages V1, V2 and V3 in a network of fig 3, using nodal

**07**

analysis.

**OR**

**(c)**Find the current I1, I2, I3 and I4 for the network shown in fig 4, using mesh

**07**

analysis

**Q.3 (a)**State and explain Reciprocity theorem with example.

**03**

**(b)**Determine current i in a circuit shown in fig 5, using Super position theorem.

**04**

**(c)**Find the Norton's equivalent circuit across the terminal AB of the network

**07**

shown in fig 6.

**OR**

**Q.3 (a)**State and explain maximum power transfer theorem. Derive the condition for

**03**

maximum power transfer to Resistive load for DC circuit

**(b)**State and explain Millman's theorem with proof.

**04**

**(c)**Find the curr

ent in 6 ohm resistor in the network shown in fig 7, using

**07**

Thevenin's theorem

**Q.4 (a)**Write the initial conditions in the inductor and capacitor at = 0+ and = .

**03**

**(b)**Find out the values of V, dV/dT and d2V/dT2 just after switching (at time t

**04**

= 0+) in the circuit shown in fig 8.

**(c)**For the circuit shown in the fig 9, the switch `S' is at position `1' and the steady

**07**

state condition is reached. The switched is moved to position `2' at t = 0. Find

the current i(t) in both the cases, i.e. switch at position 1 and switch is at position

2

**OR**

**Q.4 (a)**Write equations of Short circuit Admittance and Open Circuit Impedance

**03**

parameters of a two port network.

**(b)**Derive the relationship between h-parameters and ABCD parameters

**04**

**(c)**Find Z parameters for the network of fig 10.

**07**

1

**Q.5 (a)**State and explain final value theorem with proof.

**03**

**(b)**Explain and derive the step response to R-L series circuit using Laplace

**04**

Transformation method. (Fig 14.)

**(c)**In the network of fig 11, if the switch has remained in position A for a long

**07**

time and then moves to position B at t = 0. Find vc(t) for t >= 0 for R2 = 405

ohm. (405 resistor is shown in fig.11)

**OR**

**Q.5 (a)**Define following terms: (a) Oriented graph (b) Co-tree. c) Cut-set

**03**

**(b)**How many trees are possible for the graph of the network of fig 12.

**04**

**(c)**For the network shown in fig 13, draw the oriented graph and write i) the

**07**

Incidence matrix, ii) Tieset matrix, and iii) f-Cutset matrix.

**Fig 2.**

**Fig 1.**

**Fig 4.**

**Fig 3.**

**Fig 5.**

**Fig 6.**

2

**Fig 8.**

**Fig 7.**

**Fig 9.**

**Fig 10.**

**Fig 11.**

**Fig 12.**

**Fig 14.**

**Fig 13.**

**************************

3

This post was last modified on 04 March 2021