Osmania University (OU) 2007 B.E Electronics
Code No. 4117/N
FACULTY OF ENGINEERING B.E. 2/4 (ECE) I-Sem. (New) Suppl. Examination May / June - 2008
Subject: Basic Circuits Analysis
Time : 3 hours ] [Max. Marks : 75
Note : Answer all questions of Part-A.
Answer five questions from Part-B.
PART - A (25 marks)
1. State initial conditions for inductor and capacitor. 2
2. Differentiate between steady state response and transient response. 2
3. Determine the voltage across 5Q resistor in Fig. 1. 3
|
5fi | |
 SUPP_files/57179-20516-BASIC CIRCUITS ANALYSIS (SEM-I) SUPP-1.png) |
2 lt Fig. 1 |
4. State Nortons theorem and explain its significance. 2
5. What is the significance of quality factor of resonance circuit ? 2
6. The current in 2mH inductor is i(t)=2 sin 377t. Find the voltage across inductor. 3
7. Find the bandwidth of series resonant circuit with R = 2Q, L=2mH, C=1 jiF.
3
8. Explain what is meant by a dual network. 2
9. The current in a branch of RLC circuit with sinusoidal excitation is given by
I = 2Z60 A and the voltage across it is V=100Z30. Find the real and reactive power in it. 3
10. Define complete incidence matrix and state its properties. 3
( PART-8(5x10=50 marks)
11. Use nodal analysis to find the power delivered by the 2V source in Fig.2. 10
1A
-@-
2V
Fig.2
2A
1Q
:20.
Obtain the zero state response and zero input response of the circuit in Fig.3. The response is i(t). Separate the total response into transient and steady state responses. 10
12.
|
2A |
 SUPP_files/57179-20516-BASIC CIRCUITS ANALYSIS (SEM-I) SUPP-2.png) |
|
1H 5V |
id)
1Q
10u(t)
Fig.3
ir jf
13. (a) Stat and prove superposition theorem. 5
(b) What load resistance must be connected across the terminals a, b of the network shown in Fig.4 to obtain maximum power ? What is the maximum power absorbed by the load ? 5
1A
j i o a
m
 SUPP_files/57179-20516-BASIC CIRCUITS ANALYSIS (SEM-I) SUPP-3.png)
Fig.4
4V
:2Q
14. In the circuit of Fig.5, the switch S was inpostition I5 for a long time before it was moved to position 2 at t = 0. Determine the voltage V2(t) for t > 0.
10
1 2 5n -'VW-- Q_a-s/ijs/v-
10Q /T
-o +
V2(t)
Fig.5
C.J_
IF
"I_
10V
2F
~o -
15. (a) Show that the resonant frequency of a series RLC circuit is the geometric mean of the two half power frequencies. 5
(b) Derive the relation between Q factor and bandwidth for a series R,L,C circuit. 5
16. (a) Show that a tree of a connected graph has (n-1) branches where n is the number of nodes in the graph. 4
(b) For the network shown in Fig.6, wirte a tie-set schedule. Obtain the values of branch voltages and branch currents. 6
ion
-/W\
3fl
AWv ,
4Q
Fig.6
sn
5fi
10V
l
- L
2Q
17. In the circuit shown in Fig.7, the driving voltage is V(t)= 1 Ocos {10t+60). Find the current i in the steady state. Draw the complete phasor diagram. 10
2H itwtTv-
T
Fig.7
V(t)
C-142/500
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Attachment: |
| Earning: Approval pending. |
