Hall Ticket No Question Paper Code: AEE005
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech III Semester End Examinations (Regular) December, 2017
Regulation: IARE R16
NETWORK ANALYSIS
(Electrical and Electronics Engineering)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Derive the equation for the voltage and current in star system.
A symmetrical three phase, three wire 440 V supply is connected to a star connected load. The
impedance in each branch are ZR 2+j3
ZY 1-j2
and ZB 3+j4
. Find its equivalent
delta connected load. The phase sequence is RYB?
2. The readings of the two wattmeters used to measure power in a capacitive load are -3000 W and
8000 W respectively. Calculate
i. the input power,
ii. the power factor at the load. Assume RYB sequence.
A 400 three phase supply feeds an unbalanced three-wire, star connected load. The branch
impedances of the load are ZR 4+j8
ZY 3+j4
and ZB 15+j20
. Find the line
currents and voltage across each phase impedance. Assume RYB phase sequence.
UNIT II
3. In the circuit shown in Figure determine the complete solution for the current, when switch
S is closed at t=0. Applied voltage is 100 cos

103t

. Resistance R 20
and
inductance L 0.1 H.
Figure 1
Page 1 of 3
A series RC circuit consists of a resistor of 10 Ω and a capacitor of 0.1 F as shown in Figure
2. A constant voltage of 20 V is applied to the circuit at t 0. Obtain the current equation.
Determine the voltages across the resistor and the capacitor.
Figure 2
4. A series RLC circuit shown in Figure comprising R 10
L 0.5 H and C 1F is excited
by a constant voltage source of 100 V. Obtain the expression for the current. Assume that the
circuit is relaxed initially.
Figure 3
The circuit shown in Figure consists of series RL elements with R 150
and L 0.5 H. the
switch is closed when 30. Determine the resultant current when voltage V 50 cos (100t
is applied to the circuit at
Figure 4
UNIT III
5. For the circuit shown in Figure 5 plot the locus of the current, mark the range of I for maximum
and minimum values of and the maximum power consumed in the circuit. Assume XL 25

and R 50
. The voltage is 200 50 Hz.
Figure 5
Page 2 of 3
Obtain the transform impedance of the network shown in Figure 6.
Figure 6
6. List out the necessary conditions for a driving point function.
Plot the current locus for the circuit with R 50 Ohms and Xl 25 Ohms variable V 200
50 Hz. Find the power consumed.
UNIT IV
7. Determine Y parameters in terms of Z parameters.
Find the Z parameters for the network shown in Figure 7.
Figure 7
8. Determine the interrelationship between ABCD parameters and Z parameters.
Determine ABCD parameters for the following network shown in Figure 8.
Figure 8
UNIT V
9. What are the classifications of filter? Discuss them briefly.
Design a low pass filter (both and T section) having a cut off frequency of 2 kHz to operate
with a terminated load resistance of 500
.
10. Explain briefly about Band Elimination Filter.
Design a band-elimination filter having a design impedance of 600
and cut-off frequencies f1
2 kHz and f2 6 kHz.