F2 B2F2006

Total Pages: 2
Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST/SECOND SEMESTER B.TECH DEGREE EXAMINATION, JULY 2017
Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 2 marks.

1 Write the resistance value for the given colour code orange, orange, yellow and (2)

gold?
2 Briefly explain the working principle of transformer? (2)
3 What is the use of a relay? (2)
4 Differentiate between Zener breakdown and avalanche breakdown. (2)
5 What is meant by early effect in transistors? (2)
6 What is the basic principle behind the working of a photo diode? (2)
7 Draw the block diagram of public address system. (2)
8 State the working principle of an oscillator. (2)
9 Define (a) ripple factor (b) rectification efficiency. (2)
10 List the characteristics of an ideal op-amp. (2)
11 What are universal gates? Why are they called so? (2)
12 Draw the block diagram of a function generator? (2)
13 Explain the need for modulation? (2)
14 List out the advantages of geostationary satellites? (2)
15 Explain the concept of frequency reuse? (2)
16 Compare AM and FM. (2)
17 Mention the advantages of optical communication? (2)
18 Write the applications of CCTV. (2)
19 Write the principle of light transmission through optical fiber? (2)
20 Differentiate between single mode and multimode fibers? (2)

PART B
Answer any eight questions, each carries 5 marks.

21 Explain the constructional details of: - (5)

i) Carbon composition fixed resistors ii) Carbon potentiometers
22 Explain any two types of fixed capacitors with neat diagram. (5)
23 Sketch the input and output characteristics of common emitter transistor (5)

configuration and explain briefly?
24 How a barrier potential is developed in a p-n junction diode? (5)
25 With a neat circuit diagram explain the working of an RC coupled amplifier. (5)
26 Discuss the working principle of bridge rectifier with relevant waveforms. (5)
27 With suitable circuit diagram explain the working of an inverting amplifier using (5)

op-amp. Also derive its voltage gain?

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