PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering
Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EE)/(Electrical & Electronics)/(Electronics & Electrical) (2011 Onwards)
B.Tech.(Electrical Engineering & Industrial Control) (2012 Onwards)
(Sem.?3)
ELECTRONIC DEVICES AND CIRCUITS
Subject Code : BTEE-304
M.Code : 57095
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1)
Answer briefly :
a) State few applications of Zener diode.
b) Find the base current for CE transistor circuit if Ic = 80mA and = l 70.
c) State Miller's theorem.
d) Define conversion efficiency of power amplifier.
e) State the Barkhausen criterion for an oscillator.
f) Draw the structure of UJT.
g) List the types of multivibrator.
h) What is the need of summing amplifier?
i) List out some advantages of double tuned amplifier.
j) What is meant by saturation region?
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SECTION-B
2) Derive the expression for the space charge or transition capacitance of PN diode with
reverse bias with a neat diagram.
3) Explain Zener diode as a voltage regulator.
4) Explain how the amplification factor, input impedance, output impedance and bandwidth
are modified with negative feedback.
5) What is MOSFET? Explain the construction and characteristics of N- channel MOSFET
with the help of suitable diagram.
6) Explain the working of 555 timer as oscillator.
SECTION-C
7) Briefly explain voltage -series feedback amplifier with neat diagram and derive an
expression for input output resistance.
8) Design a RC phase shift oscillator to generate 5kKz sine wave with 20V peak to peak
amplitude. Assume hfe = = 150, C = 1.5nf, hre = 1.2k.
9) Write the ac equivalent circuit for voltage divider JFET configuration and determine Zi, Zo
and Av.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 04 November 2019