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

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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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Code No: R05010401 Set No. 1

total power input is 3.25kw and the current is 20Amps. Find the current

through Z3.(Figure 3) [6+6+4]

Figure 3

4. (a) Find the Laplace Transform of single pulse shown in Figure 4a.

Figure 4a

(b) Deﬁne RMS value, Average value, Form factor of an alternating quantity. Also

state the relationship between them.

(c) Find the RMS value of the voltage wave whose equation is v(t)=10+200

Sin(wt-30o)+100Cos3wt-50 Sin(5wt+600). [8+4+4]

5. (a) A heating element pure resistive rated for 450 watts, 110 V is to be worked

from 220V, 50Hz main supply by connecting a series inductor. Calculate the

value of the inductance needed?

(b) A load consumes 100 watts at 0.8 p.f lagging. If the load voltage and current

phasors are expressed as follows, evaluate A and B:

V=(25+jA) volts

I=(B+j1) Amps. [8+8]

6. (a) Find the y-parameters of the network shown in Figure 6a and there by obtain

z-parameters.

Figure 6a

(b) Obtain the expressions to get symmetry and reciprocity of a given network in

terms of g-parameters. [12+4]

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Code No: R05010401 Set No. 1

7. Derive the expressions for attenuation constant, phase constant, cut-oﬀ frequency

and characteristic impedance of a symmetrical Π section. [16]

8. (a) What is constant k-ﬁlter? What is the diﬀerence between constant k-ﬁlter and

m-derived ﬁlter? What are the limitations of constant K-ﬁlter?

(b) Find the circuit parameters of a constant k-band pass ﬁlter having a pass band

from 500 Hz and a characteristic resistance of 100Ω. [8+8]

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