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APJ ABDUL KALAM TECHNOLOGICAL UNI
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2019

Course Code: EST 130
Course Name: BASICS OF ELECTRICAL AND ELECTRONICS ENGINEERING

PART Il: BASIC ELECTRONICS ENGINEERING

(2019-Scheme)
Max. Marks: 50 Duration: 90 min
PART A
Answer all questions, each carries 4 marks.
1 What are the different types of capacitors? Give any two applications of
capacitors.
2 Describe the forward characteristics of a diode?
3 Draw the block diagram of a public address system and write the role of
each block.
4 Explain the working of a bridge rectifier.
5 Explain the concept of cells in cellular communication. (5x4=20)
PART B
Answer one full question from each module, each question carries 10 marks
Module-IV
6 ஐ Explain the formation of potential barrier in a PN junction diode. (4)
b) What do you understand by Avalanche breakdown? Draw and explain the (6)
reverse V-I characteristics of a diode.
OR
7 Explain the working of an NPN transistor. Describe with suitable sketches (10)
the input and output characteristics of an NPN transistor.
Module-V

8 a) Draw the circuit diagram of an RC coupled amplifier and explain its

frequency response. (6)
10) Narrate how capacitor filter eliminate ripples from the output of a rectifier. (4)
OR
9 a) What is the need of biasing? Draw the potential divider biasing circuit? (4)
b) Explain the working of a simple zener voltage regulator. (6)
Module-VI

10 a) What are the merits of AM compared to FM. The carrier amplitude of a
given AM wave is 5V and the message signal amplitude is 3V. Find the (5)
modulation index.
b) Explain the block diagram of a super heterodyne receiver. (5)

OR

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