Code No: R05010401 Set No. 1

I B.Tech Semester Supplimentary Examinations, June 2009

NETWORK ANALYSIS

( Common to Electronics & Communication Engineering, Electronics &

Instrumentation Engineering, Bio-Medical Engineering, Electronics &

Telematics and Electronics & Computer Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

⋆⋆⋆⋆⋆

1. (a) The following current wave form i(t) is passed through a series R-L circuit

with R =2 Ω and L =2 mH. Find the Voltage across each element and sketch

the same. (Figure 1a)

Figure 1a

(b) Using nodal analysis, determine the Power supplied by 8V Voltage source.

(Figure 1b)

Figure 1b

(c) Write the Tieset matrix for the graph shown in Figure 1c, taking the tree

consisting of branches 2,3,4. [6+6+4]

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Code No: R05010401 Set No. 1

Figure 1c

2. (a) Explain the Dot convention for mutually coupled coils.

(b) Two coils A & B having 100 and 250 turns respectively are wound side by side

on a magnetic material having a c.s.area of 10 cm2and a mean length of 150

cms The permeability of the material is 500. Determine the self-inductance of

the two coils A & B and mutual inductance between them. If the current in

coil A changes from zero to 2A in 0.01 seconds, ﬁnd the Emf induced in the

coil B.

(c) Derive the relation between the ﬂux density B, and magnetizing force H. Sketch

the general shape of B-H curve for both magnetic and nonmagnetic materials.

[4+8+4]

3. (a) the circuit (Figure 3a) shown, the switch is changes from position 1 to 2 at

t=0. Determine the initial conditions i , di/dt , d2i/ dt2at t=0+

Figure 3a

(b) In the parallel resonant circuit, determine the resonance frequency, dynamic

resistance and Band width for the circuit (Figure 3b) shown.

Figure 3b

(c) When an voltage of 220V A.C supply connected across the AB terminals, the

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Network Analysis

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25/08/2011