Hall Ticket No Question Paper Code: AEE017
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech III Semester End Examinations (Supplementary) February, 2018
Regulation: IARE R16
ELECTRICAL TECHNOLOGY
(Electronics and Communication 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. The following Figure 1 represents a parallel RLC circuit where R=0.1
L=0.5H and C is 1F.
Capacitor C has an initial voltage of 10V (polarity being shown in the Figure 1). The switch K
is closed at time t=0. Obtain
Figure 1
In the following Figure find the expression for currents and voltages through the inductor L
and resistances R1 andR2 after the switch is opened. Assume steady state initial condition with
the switch closed at R1=R2=10

Figure 2
2. A two mesh network is shown in the following Figure obtain the expression for and
when the switch is closed.
Page 1 of 3
Figure 3
Assuming the initial current to be 2A through the inductor, find in the Figure 4. What
will be if the supply is u
Figure 4
UNIT II
3. Obtain the open circuit parameters and loop equations of the network shown in the Figure 5.

Figure 5
Find ABCD parameters of the following lattice network shown in Figure 6.
Figure 6
4. For a series connected two port network, show that the overall impedance parameter matrix is
simply the sum of impedances matrices of each individual network.
Page 2 of 3
In the network of the following Figure r1=10Ω, r2=40KΩ, RL=50KΩ.
Find: h-parameters, voltage gain, input impedance.
Figure 7
UNIT III
5. Design a lattice and a T-type attenuator if the characteristic resistance is 200 ohm and the
attenuation 20dB.
Design an L-section attenuator which has input resistance, load resistance and the image resistance
looked from the input terminals as 200 ohms and the attenuation is 10 when the L-section
face Input terminals Output terminals.
6. Design a low-pass constant-K type T-section and -section filters with fc=3 KHz and nominal
characteristic impedance 500 ohms. Also determine the frequency at which the filter offers
attenuation of 20dbs. Determine  for f=2KHz and f=10KHz.
Design a band stop, constant-K filter with cut off frequencies of 4KHz and 10KHz and nominal
characteristic impedance of 500Ω.
UNIT IV
7. Classify DC generators based upon the excitation and write the voltage and current relations.

The armature of a 6 pole DC generator has a wave winding containing 664 conductors. Calculate
the generated e.m.f when the flux per pole is 0.06Wb and the speed is 250 rpm. At what speed
must the armature be driven to generate an e.m.f of 250 V if the flux per pole is reduced to
0.058Wb?
8. What are the various testing methods for a DC machine and explain Swinburne's test in detail.

A 6 pole lap wound DC shunt motor has 500 conductors in the armature. The resistance of
armature path is 0.05 ohm and field resistance is 25 ohm. Find the speed of the motor when it
takes 120A from dc mains of 120V. Flux per pole is 2X10􀀀2Wb.
UNIT V
9. Derive the emf equation of the transformer.
A step down transformer has a transformation ratio of 1/4 and takes a no-load current of 1A, at
a power factor of 0.2 lag. Determine the primary current and power factor, when the transformer
is supplying a load of 35A at 0.8 power factor lagging.
10. In a 25kVA, 2000/200 V transformer, the iron and copper losses are 350 Watts and 400 Watts
respectively. Calculate the efficiency at full load and 0.8 power factor lagging.
Explain the constructional details of any two type of transformers.