F $2030

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 5 marks. Marks
] Explain the different types of variable resistors? Mention their applications. (5)
2 What is meant by intrinsic and extrinsic semiconductors? How a P-type (5)

semiconductor is formed?
3 Explain the working of Zener voltage regulator with a neat diagram. (5)
4 Draw the functional block diagram of an operational amplifier. List the (5)

parameters of an ideal Op-amp

5 Write the expression of an AM and FM signal and explain the terms. (5)
6 Explain how modulation reduces antenna height. (5)
7 Discuss the major advantages of optical communication system. What are the (5)

sources and detectors used in optical fibre communication system?

8 What is meant by a DTH system? What are the main features of DTH? (5)

PART 8
Answer six questions, one full question from each module and carries 10 marks.

Module 1

9. a) Write down the color code for a given resistor of 47-Kilo-ohms with atolerance (4)

of 10%.
b) Discuss on different types of transformers. (6) ‘
OR
10 8) Give brief details of (5)

(1) Impact of electronics in industry
(11) Medical electronics
b) Draw and explain the construction of a wet electrolytic capacitor. (5)
Module 1
11 a) Sketch the input and output characteristics of common emitter transistor (5)
configuration and explain briefly.

b) Derive the relation between a and 8 for a transistor. For an npn transistor, (5)

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