Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 2130901 Circuits And Networks Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2130901 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) In terms of two terminal elements, define: 1) Unilateral elements, 2)
Passive elements, 3) Time-variant elements.
03
(b) Draw circuit representations of ideal and practical voltage and current
sources. How internal impedance affects the performance of practical
voltage and current sources?
04
(c) For the network shown in figure 1, obtain the power loss in 4 ? and 5 ?
resistors using mesh analysis.
07
Q.2 (a) Using equivalent circuit representations at t=0+, explain initial
conditions in R, L and C elements.
03
(b) For the network shown in figure 1, obtain the power loss in 10 ? resistor
using nodal analysis.
04
(c) Find out Z-parameters for the network of figure 2 07
OR
(c) Find out ABCD parameters for the network of figure 3. 07
Q.3 (a) State and explain substitution theorem. 03
(b) For the network shown in figure 4, switch K is closed at t=0. The
current waveform is observed with CRO. The initial value of the current
is measured to be 0.01 A. The transient appears to disappear in 0.1 sec.
Find: 1) The value of R, 2) The value of C, 3) The equation of i(t).
04
(c) For the network given in figure 5, obtain equivalent circuit and hence
find current in the branch AB using Thevenin?s theorem.
07
OR
Q.3 (a) Give various properties of positive real functions. 03
(b) State and explain compensation theorem. 04
(c) In the network of figure 6, capacitor C1 is charged to voltage V0 and the
switch is closed at t=0. When R1=2M ?, V0=1000V, R2=1M ?, C1=10?F
and C2=20 ?F, solve for
?? 2
?? 2
???? 2
? at t=0+.
07
Q.4 (a) Draw general nature of time response of a system when: 1) Poles are
complex conjugate having negative real part. 2) Poles are imaginary
with zero real part. Give your comment on the two responses.
03
(b) Explain the properties of Hurwitz polynomial. 04
(c) RL series circuit with R=25 ? and L=5H is connected to V=100V dc
supply at time t=0. With no initial current in inductor, find: 1) Equation
for circuit current i(t) 2) equations for voltage across R and L 3) Current
in circuit at t=0.5sec 4) Time ?t? at which voltages across R and L
become same.
07
OR
Q.4 (a) What are poles and zeroes of network functions? Explain their physical
significance.
03
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2130901 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) In terms of two terminal elements, define: 1) Unilateral elements, 2)
Passive elements, 3) Time-variant elements.
03
(b) Draw circuit representations of ideal and practical voltage and current
sources. How internal impedance affects the performance of practical
voltage and current sources?
04
(c) For the network shown in figure 1, obtain the power loss in 4 ? and 5 ?
resistors using mesh analysis.
07
Q.2 (a) Using equivalent circuit representations at t=0+, explain initial
conditions in R, L and C elements.
03
(b) For the network shown in figure 1, obtain the power loss in 10 ? resistor
using nodal analysis.
04
(c) Find out Z-parameters for the network of figure 2 07
OR
(c) Find out ABCD parameters for the network of figure 3. 07
Q.3 (a) State and explain substitution theorem. 03
(b) For the network shown in figure 4, switch K is closed at t=0. The
current waveform is observed with CRO. The initial value of the current
is measured to be 0.01 A. The transient appears to disappear in 0.1 sec.
Find: 1) The value of R, 2) The value of C, 3) The equation of i(t).
04
(c) For the network given in figure 5, obtain equivalent circuit and hence
find current in the branch AB using Thevenin?s theorem.
07
OR
Q.3 (a) Give various properties of positive real functions. 03
(b) State and explain compensation theorem. 04
(c) In the network of figure 6, capacitor C1 is charged to voltage V0 and the
switch is closed at t=0. When R1=2M ?, V0=1000V, R2=1M ?, C1=10?F
and C2=20 ?F, solve for
?? 2
?? 2
???? 2
? at t=0+.
07
Q.4 (a) Draw general nature of time response of a system when: 1) Poles are
complex conjugate having negative real part. 2) Poles are imaginary
with zero real part. Give your comment on the two responses.
03
(b) Explain the properties of Hurwitz polynomial. 04
(c) RL series circuit with R=25 ? and L=5H is connected to V=100V dc
supply at time t=0. With no initial current in inductor, find: 1) Equation
for circuit current i(t) 2) equations for voltage across R and L 3) Current
in circuit at t=0.5sec 4) Time ?t? at which voltages across R and L
become same.
07
OR
Q.4 (a) What are poles and zeroes of network functions? Explain their physical
significance.
03
2
(b) State the advantages of network analysis using Laplace transformation.
List out steps of obtaining solution of differential equation using
Laplace transformation.
04
(c) For a second order circuit, explain solution of non-homogeneous
differential equations, clearly indicating all steps involved. Describe in
detail, how particular integral can be evaluated using method of
undetermined coefficients.
07
Q.5 (a) Describe in brief, how solution of second order homogeneous
differential equations can be obtained.
03
(b) For the network shown in figure 7, without changing the node numbers,
branch numbers and direction of branches shown in figure, obtain the
reduced incidence matrix considering node 5 as the reference node.
04
(c) In the circuit of figure 8, switch is moved to position 2 after being in
position 1 for a very long time. Using Laplace transformation, obtain
expression for i(t) for t>0.
07
OR
Q.5 (a) Find the driving-point impedance for the network shown in figure 9.
Arrange the polynomials with the highest-ordered term normalized to
unity coefficient.
03
(b) Draw the oriented graph from the reduced incidence matrix of the graph
given as:
?
?
?
?
?
?
?
?
?
?
? ? ? ?
1 0 0 0 1
1 1 1 0 0
0 1 1 1 0
A
04
(c) For the network shown in figure 7, without changing the node numbers,
branch numbers and direction of branches shown in figure, obtain the
tie-set and fundamental cut-set matrices considering the tree formed
with branches 1, 2, 3 and 4 as the twigs of the tree.
07
Figure 1 Figure 2
Figure 3 Figure 4
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 2130901 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) In terms of two terminal elements, define: 1) Unilateral elements, 2)
Passive elements, 3) Time-variant elements.
03
(b) Draw circuit representations of ideal and practical voltage and current
sources. How internal impedance affects the performance of practical
voltage and current sources?
04
(c) For the network shown in figure 1, obtain the power loss in 4 ? and 5 ?
resistors using mesh analysis.
07
Q.2 (a) Using equivalent circuit representations at t=0+, explain initial
conditions in R, L and C elements.
03
(b) For the network shown in figure 1, obtain the power loss in 10 ? resistor
using nodal analysis.
04
(c) Find out Z-parameters for the network of figure 2 07
OR
(c) Find out ABCD parameters for the network of figure 3. 07
Q.3 (a) State and explain substitution theorem. 03
(b) For the network shown in figure 4, switch K is closed at t=0. The
current waveform is observed with CRO. The initial value of the current
is measured to be 0.01 A. The transient appears to disappear in 0.1 sec.
Find: 1) The value of R, 2) The value of C, 3) The equation of i(t).
04
(c) For the network given in figure 5, obtain equivalent circuit and hence
find current in the branch AB using Thevenin?s theorem.
07
OR
Q.3 (a) Give various properties of positive real functions. 03
(b) State and explain compensation theorem. 04
(c) In the network of figure 6, capacitor C1 is charged to voltage V0 and the
switch is closed at t=0. When R1=2M ?, V0=1000V, R2=1M ?, C1=10?F
and C2=20 ?F, solve for
?? 2
?? 2
???? 2
? at t=0+.
07
Q.4 (a) Draw general nature of time response of a system when: 1) Poles are
complex conjugate having negative real part. 2) Poles are imaginary
with zero real part. Give your comment on the two responses.
03
(b) Explain the properties of Hurwitz polynomial. 04
(c) RL series circuit with R=25 ? and L=5H is connected to V=100V dc
supply at time t=0. With no initial current in inductor, find: 1) Equation
for circuit current i(t) 2) equations for voltage across R and L 3) Current
in circuit at t=0.5sec 4) Time ?t? at which voltages across R and L
become same.
07
OR
Q.4 (a) What are poles and zeroes of network functions? Explain their physical
significance.
03
2
(b) State the advantages of network analysis using Laplace transformation.
List out steps of obtaining solution of differential equation using
Laplace transformation.
04
(c) For a second order circuit, explain solution of non-homogeneous
differential equations, clearly indicating all steps involved. Describe in
detail, how particular integral can be evaluated using method of
undetermined coefficients.
07
Q.5 (a) Describe in brief, how solution of second order homogeneous
differential equations can be obtained.
03
(b) For the network shown in figure 7, without changing the node numbers,
branch numbers and direction of branches shown in figure, obtain the
reduced incidence matrix considering node 5 as the reference node.
04
(c) In the circuit of figure 8, switch is moved to position 2 after being in
position 1 for a very long time. Using Laplace transformation, obtain
expression for i(t) for t>0.
07
OR
Q.5 (a) Find the driving-point impedance for the network shown in figure 9.
Arrange the polynomials with the highest-ordered term normalized to
unity coefficient.
03
(b) Draw the oriented graph from the reduced incidence matrix of the graph
given as:
?
?
?
?
?
?
?
?
?
?
? ? ? ?
1 0 0 0 1
1 1 1 0 0
0 1 1 1 0
A
04
(c) For the network shown in figure 7, without changing the node numbers,
branch numbers and direction of branches shown in figure, obtain the
tie-set and fundamental cut-set matrices considering the tree formed
with branches 1, 2, 3 and 4 as the twigs of the tree.
07
Figure 1 Figure 2
Figure 3 Figure 4
3
Figure 5 Figure 6
Figure 7 Figure 8
Figure 9
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020