E C192055 Pages:3

Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019
Course Code: CS207
Course Name: ELECTRONIC DEVICES AND CIRCUITS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 3 marks. Marks
1 Trace the response of a RC differentiator circuit to square wave input for the )3(

designed frequency and justify circuit action. Also plot the Lissajous pattern for
a sinusoidal input

2 Design a circuit to obtain 10۷ peak to peak trapezoidal waveform from 230 ۷ (3)
mains

3 Design a loaded 5V zener regulator for a load current of 20 mA. Input voltage is (3)

12 V ‏.عل‎ Assume that zener knee current is 5 mA.

4 Verify whether the following circuit will work as a clamper (3)
1۳
‏و‎
‎ಹ 30൨
20% pp 4001
1 KHz
PART B

Answer any two full questions, each carries 9 marks.
5 8) Draw and explain the circuit of a voltage tripler. (5)
b) With the help of relevant characteristics curve, verify whether 8 FET can be used (4)
as a resistance
6 a) Draw and explain the transistorised sweep circuit using a normally on transistor (4)
switch
b) Draw and explain the circuit of a series voltage regulator using transistors. Show (5)

how fold back current limiting can be implemented in the circuit.

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