F2 A192016

Reg No.:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries5 marks. Marks
1 Discuss any ‘wo colour coding scheme of capacitors. Find the capacitance (5)
value for 2M2.
2 Explain doping concentration and size of three layers in a transistor with neat (5)
diagram.
3 Draw the diagram of an RC coupled CE amplifier and describe the role of the (5)
different capacitors.
4 Draw the block diagram of a function generator and specify the function of (5)
each block?
5 Compare AM and FM. (5)
6 Define modulation index and write down the expression for modulation index (5)

and total power in AM signal.

7 Define critical angle and total internal reflection with diagrams. (5)
8 Explain the basic block diagram of DTH system. (5)
PART B
Answer six questions,one full question from each module and carries] 0marks.
Module 1
9 a) What is a variable capacitor? Explain the construction of any 2 types of (6)

variable capacitors.
b) The average value of a resistor required 15 82kQ.What will be the sequence of (4)
the colour band when tolerance would be 10%?

OR
10 a) What are passive components? Mention at least three components with symbol. (4)
b) Explain with diagram, the operation of an electromagnetic relay (6)
Module 11

11 9) Sketch the input and output characteristics of common emitter transistor (5)
configuration and explain briefly.
b) Derive the relation between a and 0 for a transistor. For an npn transistor, (5)
a=0.995 and Ie=10m A. Find Ip and Ic?
OR

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