Download GTU BE/B.Tech 2019 Winter 3rd Sem Old 130901 Circuits And Networks Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem Old 130901 Circuits And Networks Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (Old) EXAMINATION ? WINTER 2019
Subject Code: 130901 Date: 28/11/2019

Subject Name: Circuits And Networks
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.

Q.1 (a) State and explain Thevenin?s and Norton?s theorem with suitable examples. 07
(b) What are Y parameters and Z parameters? Derive the expression for Z
parameters in terms of Y parameters and vice versa.
07

Q.2 (a) Define following terms: (i) Linear and Nonlinear networks (ii) Lumped and
Distributed Networks (iii) Passive and Active Networks (iv) Dependent Source
07
(b) State and explain initial value and final value theorem. 07
OR
(b) Obtain the laplce transform for f1(t)=t and f2(t)= te
-at
07

Q.3 (a) State and explain principle of duality. 07
(b) Solve for the nodal voltages V1, V2, V3 and V4 as shown in the network in figure
, using nodal analysis.

07
OR
Q.3 (a) State the procedure to obtain solution of a network using laplace transform
technique. State its advantages over classical method.
07
(b) In the network shown in fig. the switch K is opened at t=0. find the valus of V,
dV/dt, d
2
V/dt
2
at t=0
+
if I=10 A, R=10 ? and L=1 H

07

Q.4 (a) State and explain maximum power transfer theorem. derive the condition for
maximum power transfer to the load for d.c. circuits.
07
(b) In the network shown in fig. the switch K is moved from 1 to 2 position at t=0,
steady state having previously been attained. Determine the current i(t)
07
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (Old) EXAMINATION ? WINTER 2019
Subject Code: 130901 Date: 28/11/2019

Subject Name: Circuits And Networks
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.

Q.1 (a) State and explain Thevenin?s and Norton?s theorem with suitable examples. 07
(b) What are Y parameters and Z parameters? Derive the expression for Z
parameters in terms of Y parameters and vice versa.
07

Q.2 (a) Define following terms: (i) Linear and Nonlinear networks (ii) Lumped and
Distributed Networks (iii) Passive and Active Networks (iv) Dependent Source
07
(b) State and explain initial value and final value theorem. 07
OR
(b) Obtain the laplce transform for f1(t)=t and f2(t)= te
-at
07

Q.3 (a) State and explain principle of duality. 07
(b) Solve for the nodal voltages V1, V2, V3 and V4 as shown in the network in figure
, using nodal analysis.

07
OR
Q.3 (a) State the procedure to obtain solution of a network using laplace transform
technique. State its advantages over classical method.
07
(b) In the network shown in fig. the switch K is opened at t=0. find the valus of V,
dV/dt, d
2
V/dt
2
at t=0
+
if I=10 A, R=10 ? and L=1 H

07

Q.4 (a) State and explain maximum power transfer theorem. derive the condition for
maximum power transfer to the load for d.c. circuits.
07
(b) In the network shown in fig. the switch K is moved from 1 to 2 position at t=0,
steady state having previously been attained. Determine the current i(t)
07
2

OR
Q.4 (a) What is meant by poles and zeros of a transfer function? what is significance of
poles and zeros? Discuss the restrictions on locations of poles and zeros of
transfer functions.
07
(b) Derive expression for rise of current and decay of current in RL series
circuit excited by DC voltage source. Discuss the role of time constant in
each.
07

Q.5 (a) What are the procedure for formulation of graph, tree and incidence matrix?
Hence discuss the procedure of forming reduced incidence matrix and its
advantages.



07
(b) For the network shown in fig. draw the oriented graph.Also obtain incidence
matrix (A), fundamental tie-set matrix (Bf) and fundamental cut-set matrix (Qf)



07
OR

Q.5 (a) Write and explain initial conditions for the inductor and capacitor at t=0+ and t= ? 07
(b) Find the current passing through the 2 Ohm resistor using Mesh analysis for the
circuit shown in the following figure.
.



07

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