PTU B.Tech EEE 3rd Semester May 2019 57583 ANALOG DEVICES and CIRCUITS Question Papers

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.(Electronics Engg.) (2012 Onwards)
B.Tech.(ECE)/(Electronics & Computer Engg.)/(ETE) (2011 Onwards)
(Sem.?3)
ANALOG DEVICES & CIRCUITS
Subject Code : BTEC-301
M.Code : 57583
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS 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
Q1. Write briefly :

a) Explain how Zener diode can be used as a voltage regulator.


b) What is the principle behind the working of an oscillator?

c) Explain the working of a transistor as a switch.


d) What do you mean by dc load line?

e) Give the V-I characteristics of PN diode.

f) Calculate Ic and IE for a transistor that has dc = 0.99 and IB = 150A. Determine the

value of dc for the transistor,

g) Define Transconductance of MOSFET.


h) What is pinch off voltage?

i) State Barkhausen criteria for oscillators.


j) What is diffusion capacitance?

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SECTION-B
Q2. Explain the effect of using negative feedback on various parameters of amplifiers.
Q3. What are h-parameters? Explain how these are used for making equivalent transistor
model.
Q4. Discuss the factors involved in the selection of Ic, Rc and RE for a single stage common
emitter BJT amplifier circuit, using voltage divider bias.
Q5. Explain in detail with diagrams, the difference between LED and Photo-diodes.
Q6. Explain construction, operation and characteristics of JFETs.

SECTION-C
Q7. Explain the construction and working of MOSFET.

Q8. Explain the working of Colpitts oscillator. Derive the expression for its frequency.
Q9. Describe in detail with diagram and characteristics:




a) UJT

b) RC phase shift oscillator.






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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