Andhra University 2007 B.E NETWORK THEORY - Question Paper

II Year B.E./B.Tech Degree exam

NETWORK THEORY

(Common to EEE & ECE Branches)

1. a) State and discuss duality theorem. (5 x three = 15)

b) What is source free response? discuss in detail various

cases of natural response of an RLC circuit.

c) State and discuss Superposition theorem.

d) provide the restrictions on pole and zero locations for driving

point functions.

e) Using R-H criterion, check the stability of the network having

the denominator polynomial of the network function provided

as Q(s)=2s4+s3+3s2+5s+10

2) a) Use mesh analysis to find 0 i in the circuit provided beneath.

b) For the circuit shown in the figure, obtain the voltage across

j5W

II Year B.E./B.Tech Degree exam

NETWORK THEORY

(Common to EEE & ECE Branches)



3) a) discuss in detail various cases of natural response of an

RLC circuit.

b) find the inductor current for both t<0 and t>0 in the circuit

provided beneath.

4) a) obtain the capacitor voltage ‘v’ for t < 0 and t > 0 for the

provided circuit

b) compute i(t) for t > 0 in the circuit provided beneath using Laplace

transform method.


5) a) State and prove initial and final value theorems.

b) Use Thevenin’s theorem to obtain ‘v’ in the circuit.

6) a) Use Norton’s theorem to obtain current ‘i’ in the circuit.

b) Determine the ‘z’ parameters of two-port network provided in

the figure.

7) a) A periodic voltage waveform has been shown. Determine

rms value, avg. value, form factor.



b) A 4 wire Y–Y circuit has

120 1200 , 120 00 an bn V = Ð VV = Ð V and

120 1200 cnV= Ð- V. If the impedances are

20 600 , 30 00 AN BN Z = Ð WZ = Ð W and 40 300 CN Z = Ð W

obtain the current in the neural line.

8) a) Design a series RLC circuit, which will have an impedance

of 10W at the resonant frequency of 0 w = 50 rad / sec and

a quality factor of 80. obtain also the bandwidth.

b) Determine the line current in a three -f system with a line voltage

of 300V that supplies 1200 Watts to Delta connected

balanced load at a lagging power factor of 0.8. obtain also the

impedance of every phase.

Earning:   Approval pending.