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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST/SECOND SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING

Max. Marks: 100 ५ Duration: 3 Hours
PARTA
Answer all questions, each carries 5 marks. Marks
| Explain with diagram, the operation of an electromagnetic relay. (5)
2 Draw and explain the forward and reverse characteristics of a PN junction diode (5)
using the diode equation.
3 Draw circuit diagram and explain how Zener diode can be used as a voltage (5)
regulator.
4 Draw the functional block diagram of operational amplifier and explain the (5)
functions of each block.
5 Distinguish between LEO, MEO and GEO satellites. (5)
6 Explain the need for modulation. Write two drawbacks of frequency modulation (5)
compared to amplitude modulation.
7 Explain working of CCTV with block diagram. (5)
8 With a block schematic explain functioning of a typical optical communication (5)
system.
PART B

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

Module I
9 a) With neat diagrams, explain construction of wire wound resistor and carbon (5)
composition resistors.
b) A carbon resistor has colour code violet, grey, yellow and gold. Find the range (5)
resistance value.

OR
10 Write the principle of working of transformer.Explain the losses that occur ina (10)
transformer.
Module II
11 a) Explain the formation of depletion region in PN junction. (5)
b) Explain the principle of operation of LED. (5)
OR
12 Describe the construction and operation of NPN transistor. (10)
Module 111

13 a) With circuit diagram and waveforms, explain the working of centre tapped full (5)
wave rectifier.
b) Draw the block diagram of a public address system and specify the functions of (5)
each block.

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