PTU B.Tech ECE 3rd Semester May 2019 58007 ELECTRONICS DEVICES AND ANALOG ICs Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester May Electronic and Communication Engineering (ECE)

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EIE) (2011 & Onwrads) (Sem.?3)
ELECTRONICS DEVICES AND ANALOG ICs
Subject Code : EI-201
M.Code : 58007
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.
Write briefly :

a. What is the use of DC load line?

b. Draw the VI characteristics of the JFET?

c. Write input resistance equation of hybrid equivalent CC configuration.

d. What do you understand by heat sink?

e. What is use of multistage amplifiers? List at least two advantage of it.

f. Distinguish between couplings and bypass capacitor.

g. Define the role of XY plate of CRO.

h. What is "Dark current" of a photodiode?

i. Explain the LC filter used in rectifiers.

j. What is beam shaping?
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SECTION-B
2.
Draw the hybrid model of a low frequency small signal voltage amplifier.
3.
Discuss the working of symmetric push pull amplifier with suitable diagram.
4.
What is JFET? Distinguish between FET and MOSFET.
5.
Explain the operation of N-channel MOSFET in depletion mode using suitable diagram.
6.
What is the basic principle of working of LCD's? How these differ from LED's.

SECTION-C
7.
In the circuit given below, calculate Zi, ZO, AV, and Ai. Note that this CE stage uses a
single bias resistor RB1 which is the value RBB.
Vcc 20V
IO
270K
Rb1
RC 5k6
Ii

V
C
0
Vi
C2
B
C1
hfe = 120

Zi
E
hie =560R
1k2
RE

Fig.1
8.
What is the use of a rectifier? Compare and contrast half and full wave rectifiers.
9.
Write short notes on :

a. CRO

b. Transistor as switch
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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