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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 5 marks. Marks

1 With the help of neat diagram, explain the construction and working of (5)
electrolytic capacitor.

2 With the help of energy band diagram explain insulators, conductors and (5)
semiconductors.

3 Draw the block diagram of a DC power supply and mention the functions of each (5)
block.

4 Why are universal gates called so? Realize a two input OR gate using any one of (5)
the universal gates.

5 Write main features of the orbit of a geo stationary satellite. (5)
Draw the frequency spectrum of an amplitude modulated (AM) wave. Given that (5)
modulating signal is of frequency fm, amplitude Vm and carrier of frequency fe,
amplitude സം. Take modulation index as m. What is the bandwidth requirement
of this AM wave?

7 Draw and explain the structure of an optical fiber cable. (5)

8 With supporting diagram explain frequency reuse done in cellular (5)
communication.

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

9 a) Write the significance of specifying tolerance value of a component. A ceramic (5)
capacitor has got the following code marked on its surface. Identify the
capacitance value. (i) 103J (ii) 2n2

b) Explain the basic working principle of transformer. Write the equation relating (5)
primary and secondary voltages to turns ratio.
OR
10 8) Explain the working of electromagnetic relays. (5)
b) Write and explain any five applications of Electronics in industry. (5)
Module II

11 With neat diagrams, explain the input and output characteristics of a common (10)

emitter NPN transistor.
OR
12 a) Derive the relation between 0 and ‏م‎ for a transistor. For an npn transistor, a= (5)

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