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Electric Circuit Analysis Question Paper - Dec 18 - Electrical And Electronics (Semester 3) - Visveswaraya Technological University (VTU)
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Electric Circuit Analysis - Dec 18
Electrical And Electronics (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
MODULE - 1
1.a. Find ‘Ia’ shown in the circuit in Fig Q1(a) using mesh analysis
1.b.
Find the Ix in the circuit show in Fig Q1(b) using source transformation
(8 marks)
00
OR
2.a.
Find V1 in the circuit shown in Fig Q2(a) using node analysis,. When V2 = 20 volts.
(6 marks)
00
2.b.
A series RLC circuit consist of R = 50
, L = 0.2H, C = 10μF, with an applied voltage of 20V. Determine resonant frequency half power frequencies, Q – factor and B.W of the circuit
(5 marks)
00
, L = 0.2H, C = 10μF, with an applied voltage of 20V. Determine resonant frequency half power frequencies, Q – factor and B.W of the circuit
2.c.
Find the current I in the circuit show in Fig Q2(c). Using star delta transformation
(5 marks)
00
Module-2
3.a.
State maximum power transfer theorem
(3 marks)
00
3.b.
For the circuit shown in Fig Q3(b). Find current ‘I’ using super position theorem
(5 marks)
00
3.c.
For the circuit shown in Fig Q3(b). Find current ‘I’ using super position theorem
(8 marks)
00
OR
4.a.
For the circuit shown in Fig Q4(a) obtain the Thevnin’s equivalent across A– B.
(6 marks)
00
4.b.
Find I using Millman’s theorem for the network shown in Fig Q4(b)
(4 marks)
00
4.c.
Find the value of ib in the Fig Q4(c) using Norton’s theorem
(6 marks)
00
Module-3
5.a.
circuit shown in Fig Q5(a). the switch ‘S’ removed from a to b at t = 0.
(8 marks)
00
Find i , $\frac{d i}{d t}, \frac{d^{2} i}{d t^{2}}$ at $t=0^{+}$ steady state is achieved when switch is at a.
5.b.
In the circuit shown in Fig Q 5(b) switch K is opened at t = 0. Find the value of $\mathrm{V}_{1} \frac{\mathrm{d} \mathrm{v}}{\mathrm{dt}}, \frac{\mathrm{d}^{2} \mathrm{v}}{\mathrm{dt}^{2}}$ at $\mathrm{t}=0^{+}$
(8 marks)
00
OR
6.a.
In the circuit shown Fig Q6(a) determine the complete solution of current when switch is closed at t = 0.
(8 marks)
00
6.b.
In the circuit sown in Fig Q6(b). Determine V $\mathrm{V}_{\mathrm{a}}\left(0^{-}\right), \mathrm{V}_{2}\left(0^{+}\right)$ at $\mathrm{t}=0$
Steady state is reached with switch open.
(8 marks)
00
Module - 4
7.a.
Use initial and final value theorem to find F(0) and F(α)
(4 marks)
00
$F(s)=\frac{s^{3}+7 s^{2}+5}{s\left(s^{3}+3 s^{2}+4 s+2\right)}$
7.b.
State and prove initial value theorem and final value theorem
(6 marks)
00
7.c.
Obtain the Laplace transform of the function shown in Fig Q7(c)
(6 marks)
00
OR
8.a.
Derive the Laplace transform of a periodic signal.
(8 marks)
00
8.b.
Obtain the Laplace transform of the given wave form in Fig Q8(b).
(8 marks)
00
Module - 5
9.a.
A three phase, 400V, 4 wire system has a star connected load with $\mathrm{Z}_{\mathrm{A}}=(10+\mathrm{j} 0) \Omega$ $\mathrm{Z}_{\mathrm{B}}=(15+\mathrm{j} 10) \Omega, \mathrm{Z}_{\mathrm{c}}=(0+\mathrm{j} 5) \Omega$ . Find the line currents and current through neutral wire
(6 marks)
00
9.b.
Define Z and Y parameters
(6 marks)
00
9.c.
Find z parameters for the circuit in Fig Q9(c)
(6 marks)
00
OR
10.a.
Find $V_{c}(t)$ in the circuit shown in Fig $Q 10(a)$ assuming zero initial condition.
(8 marks)
00
10.b.
The pole – zero plot for an R-L-C circuit, driving point admittance, is as shown in FigQ10(b). Find the values of R,L,C.
(8 marks)
00
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