Download GTU BE/B.Tech 2019 Summer 3rd Sem New 2130901 Circuits And Networks Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem New 2130901 Circuits And Networks Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2130901 Date: 04/06/2019

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.

MARKS

Q.1 (a) Mention the relations between voltage and current for the following passive
elements. (1) Resistor (2) Capacitor.
03
(b) Define following terms: (a) Linear and Nonlinear Networks (b) Active and
Passive Networks
04
(c) In the network of figure: 1, all sources are time invariant. Determine the
branch current in the 2 ohm resistor using Source Transformation
method.
07

Q.2 (a) State and explain Thevenin?s theorem 03
(b) Explain characteristic of an ideal voltage source. 04
(c) Find the value of all currents and the current in the 10? resistor for the
network shown in figure 2 using mesh analysis.
07
OR
(c) In the network of figure 3, Determine the node voltages V1, V2, & V3 using
node analysis.
07
Q.3 (a) Determine the equivalent inductance at terminals A-B for the circuit shown
in figure: 4.
03
(b) Construct the exact dual of the network of figure5. 04
(c) Determine the value of I1 in the network of figure 6 using superposition
theorem.
07
OR
Q.3 (a) State and explain maximum power transfer theorem. 03
(b) Explain and derive the step response to R-L series circuit using Laplace
Transformation method.
04
(c) Explain the procedure to obtain sinusoidal steady state response of a circuit. 07
Q.4 (a) Write the initial conditions in the inductor and capacitor at ?? = 0+ and ?? =
?.
03
(b) Explain significance of poles and zeros in network functions. 04
(c) What is time constant? Explain time constant in terms of RL and RC circuit 07
OR
Q.4 (a) Determine the Laplace transform of ( ?? ) = ?? ? ?? ?? cos ?? ?? . 03
(b) Define: (1) Oriented Graph (2)Tree (3) Tie-set (4) Incidence matrix 04
(c) The switch K is opened at t=0. Find out the values of ?v?; ?dV/dt? and
?d
2
V/dt
2
? just after switching (at time t = 0+) in the circuit shown in the
following figure 7.
07
Q.5 (a) State and explain initial value theorem. 03
(b) Derive the condition for the network to be reciprocal for ABCD-parameters. 04
(c) Find the Z parameters for the network shown in figure 8. 07
OR

Q.5 (a) Briefly describe Millman?s theorem. 03
(b) Determine y-parameters in terms of z-parameters. 04
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2130901 Date: 04/06/2019

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.

MARKS

Q.1 (a) Mention the relations between voltage and current for the following passive
elements. (1) Resistor (2) Capacitor.
03
(b) Define following terms: (a) Linear and Nonlinear Networks (b) Active and
Passive Networks
04
(c) In the network of figure: 1, all sources are time invariant. Determine the
branch current in the 2 ohm resistor using Source Transformation
method.
07

Q.2 (a) State and explain Thevenin?s theorem 03
(b) Explain characteristic of an ideal voltage source. 04
(c) Find the value of all currents and the current in the 10? resistor for the
network shown in figure 2 using mesh analysis.
07
OR
(c) In the network of figure 3, Determine the node voltages V1, V2, & V3 using
node analysis.
07
Q.3 (a) Determine the equivalent inductance at terminals A-B for the circuit shown
in figure: 4.
03
(b) Construct the exact dual of the network of figure5. 04
(c) Determine the value of I1 in the network of figure 6 using superposition
theorem.
07
OR
Q.3 (a) State and explain maximum power transfer theorem. 03
(b) Explain and derive the step response to R-L series circuit using Laplace
Transformation method.
04
(c) Explain the procedure to obtain sinusoidal steady state response of a circuit. 07
Q.4 (a) Write the initial conditions in the inductor and capacitor at ?? = 0+ and ?? =
?.
03
(b) Explain significance of poles and zeros in network functions. 04
(c) What is time constant? Explain time constant in terms of RL and RC circuit 07
OR
Q.4 (a) Determine the Laplace transform of ( ?? ) = ?? ? ?? ?? cos ?? ?? . 03
(b) Define: (1) Oriented Graph (2)Tree (3) Tie-set (4) Incidence matrix 04
(c) The switch K is opened at t=0. Find out the values of ?v?; ?dV/dt? and
?d
2
V/dt
2
? just after switching (at time t = 0+) in the circuit shown in the
following figure 7.
07
Q.5 (a) State and explain initial value theorem. 03
(b) Derive the condition for the network to be reciprocal for ABCD-parameters. 04
(c) Find the Z parameters for the network shown in figure 8. 07
OR

Q.5 (a) Briefly describe Millman?s theorem. 03
(b) Determine y-parameters in terms of z-parameters. 04
2
(c) Derive relationship between incidence matrix (A), fundamental tie-set
matrix (Bf) and fundamental cut-set matrix (Qf).
07




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