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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -III• EXAMINATION SUMMER 2017
Subject Code: 331101 Date: 29 04 2017
Subject Name: Electronics devices and circuits-II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

Compare negative feedback and positive feedback
07





Which are the different types of negative feedback? Explain any one type with
circuit diagram.
07



Q.2

Draw circuit of class A power amplifier with transformer coupled load and
explain its working
07


A


Explain Hartely oscillator with necessary circuit and its equation
07



OR

Explain Colpitt oscillator with necessary circuit and its equation
07



Q.3

Define the different types of Multi-vibrators and explain any one circuit with help of necessary waveforms
07





Write short note on MOSFET
07

MOSFET

OR
Q.3

Explain difference between voltage amplifier and power amplifier
07





Explain classification of power amplifiers in detail
07



Q.4

Draw and explain functional block diagram of IC555
07


IC555


Compare BJT, JFET and MOSFET
07
2/2

BJT, JFET MOSFET

OR
Q.4

Explain construction and working of N channel JFET
07


N JFET


Explain astable operation of IC555 with circuit diagram, waveform and necessary equation.
07

IC555

Q.5

Draw and explain inverting and non inverting amplifier circuit using IC741
07


IC741 inverting non inverting


Explain construction, working and characteristics of IGBT
07

IGBT

OR
Q.5

Draw and explain integrator and differentiator circuit using IC741
07


IC741 integrator differentiator


Explain class B push pull amplifier
07

B