Hall Ticket No Question Paper Code: AEE018
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech III Semester End Examinations (Supplementary) July, 2018
Regulation: IARE R16
BASIC ELECTRICAL AND ELECTRONICS ENGINEERING
Time: 3 Hours (Common to AE ME CE) 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. Classify types of electrical circuit elements and explain.
Find the equivalent resistance Rab shown in Figure 1.
Figure 1
2. What are the essential operating torques in indicating instruments and explain in detail.
Determine voltages V1 and V2 power dissipated by 3KΩ 20 KΩ and power supplied by current
source shown in Figure 2.
Figure 2
UNIT II
3. Classify different types of DC motors and explain briefly.
A 4.46KW 220V DC shunt motor has an armature resistance of 0.03 ohm and field resistance of
150 ohm. Determine back EMF when efficiency is 85%.
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4. Derive expression for EMF generated in DC generator.
A DC generator has a generated e.m.f. of 210 V when running at 700 rpm and the flux per pole
is 120 mWb. Determine the generated e.m.f.
i. At 1050 rpm, assuming the flux remains constant
ii. If the flux is doubled at constant speed
iii. At a speed of 1155 rpm and a flux of 132 mWb.
UNIT III
5. What is a transformer? Derive expression for EMF generated in single phase transformer.
A 50 KVA single phase transformer of 2300/230V has primary and secondary winding resistances
of 2 ohm and 0.02 ohm respectively. The iron losses are equal to 412W. Calculate efficiency at
half load and full load at 0.8 pf lagging.
6. Define slip? Explain the slip-torque characteristics of three phase induction motor.
A three phase 50 Hz star connected salient pole alternator has 216 slots with 5 conductors per
slot. All the conductors of each phase are connected in series. The winding is full pitched. The
flux per pole is 30 mwb and alternator runs at 250 rpm. Determine the phase and line induced
emf, assume distribution factor 0.9597.
UNIT IV
7. What is PN junction diode? Illustrate the operation of PN junction diode with V-I characteristics
using relevant figure.
A 5V stabilized power supply is required to be produced from a 12V DC power supply input
source. The maximum power rating PZ of the zener diode is 2W. Using the zener regulator
circuit calculate:
i. The maximum current flowing through the zener diode,
ii. The minimum value of the series resistor, RS
iii. The load current IL if a load resistor of 1kΩ is connected across the zener diode
iv. The zener current IZ at full load.
8. What is a rectifier? Illustrate the operation of half wave bridge rectifier with a neat figure.
A diode operating at 3000 K at a forward voltage of 0.4 V carries a current of 10 mA. When
voltage is changed to 0.42 the current becomes twice. Calculate the value of reverse saturation
current and for the diode
UNIT V
9. Illustrate the input and output characteristics of common emitter configuration with a neat figure.

The fixed bias circuit shown in Figure 3 below uses a silicon transistor with VBE 0.7V.
i. Find the collector current, IC, and voltage VCE, if  of transistor is 60.
ii. Find IC and VCE if  changes to 80. What conclusions may be drawn?
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Figure 3
10. Illustrate the input and output characteristics of common collector configuration with a neat
figure.
What is a Junction transistor? Illustrate the physical structure and operation of both the
and transistors with a neat figure.