F2

Reg No.: Name:

B2F2004

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2017

Course Code: EC100
Course Name: BASICS OF ELECTRONICS ENGINEERING

Max. Marks:100 Duration: 3 Hours.

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PARTA

Answer ALL Questions. Each question carries 2 marks,
Write any four applications of electronics.
Explain working principle of transformer. Name any two classification of transformer.
A carbon resistor has colour code violet, green and brown. Find the range of resistance
value.
What is extrinsic semiconductor? Give four examples for pentavalent impurity and
trivalent impurity.
Calculate the value of emitter current of a transistor in active region for which 6 =
40 and ‏وا‎ = 25/4.
Draw the symbol of npn transistor. What are the typical doping concentrations and sizes
of three regions of transistor?
Draw the block diagram of 60 power supply and specify the functions of each block.
State Barkhaussen’s criterion for sustained oscillations.

Derive the expression for ripple factor of a half wave rectifier. What is its value?

. Name any four parameters of operational amplifier. Give the values of these parameters

for an ideal Op-Amp.

. Draw the block diagram of Op-Amp and specify the function of each block.

Draw the symbol and truth table of XOR gate and XNOR gate.

Name and specify any four frequency bands used for satellite communication.

What are the needs for modulation?

The amplitude of carrier wave is 10۷ and frequency is 1K Hz. Modulation index is 0.4.
Calculate the total power transmitted of an AM wave.

Differentiate the concepts between uplink and downlink frequencies.

Write any four advantages of optical communication system over copper wire-based
communication system.

What is frequency reuse?

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