Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3134104 Electronic Devices And Circuits Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3134104 Date: 3/12/2019
Subject Name: Electronic Devices and Circuits
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.
Marks
Q.1 (a) Explain the function of LED with neat sketch. 03
(b) Explain p and n semiconductor formation in detail. 04
(c) Differentiate FET and BJT. 07
Q.2 (a) List the two types of carriers and name the type of impurity that
causes each to be a majority carrier.
03
(b) With help of voltage doubler circuit, describe the action of
voltage multipliers.
04
(c) Draw and explain bridge rectifier circuit with capacitor filter. 07
OR
(c) Draw and explain series and shunt positive clipper with output
waveforms.
07
Q.3 (a) Explain Transistor as a switch. 03
(b) With the help of neat figure, explain the operation of a N-P-N
transistor.
04
(c) Determine the output waveform for the sinusoidal input of figure
given below.
07
OR
Q.3 (a) Draw V-I characteristics of Zener diode. 03
(b) Drive the relation between dc alpha and dc beta for bipolar
junction transistor.
04
(c) Explain Darlington pair in detail. Also derive its current gain. 07
Q.4 (a) Draw and explain the input and output characteristics of common
emitter configuration.
03
(b) Explain the JFET application as analog switch. 04
(c) Draw the basic construction of a p-channel JFET and explain its
operation in detail.
07
OR
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3134104 Date: 3/12/2019
Subject Name: Electronic Devices and Circuits
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.
Marks
Q.1 (a) Explain the function of LED with neat sketch. 03
(b) Explain p and n semiconductor formation in detail. 04
(c) Differentiate FET and BJT. 07
Q.2 (a) List the two types of carriers and name the type of impurity that
causes each to be a majority carrier.
03
(b) With help of voltage doubler circuit, describe the action of
voltage multipliers.
04
(c) Draw and explain bridge rectifier circuit with capacitor filter. 07
OR
(c) Draw and explain series and shunt positive clipper with output
waveforms.
07
Q.3 (a) Explain Transistor as a switch. 03
(b) With the help of neat figure, explain the operation of a N-P-N
transistor.
04
(c) Determine the output waveform for the sinusoidal input of figure
given below.
07
OR
Q.3 (a) Draw V-I characteristics of Zener diode. 03
(b) Drive the relation between dc alpha and dc beta for bipolar
junction transistor.
04
(c) Explain Darlington pair in detail. Also derive its current gain. 07
Q.4 (a) Draw and explain the input and output characteristics of common
emitter configuration.
03
(b) Explain the JFET application as analog switch. 04
(c) Draw the basic construction of a p-channel JFET and explain its
operation in detail.
07
OR
2
Q.4 (a) Compare E MOSFET with D MOSFET. 03
(b) Write the advantages and disadvantages of negative feedback. 04
(c) Explain Voltage Divider Bias biasing in detail. 07
Q.5 (a) What is the difference between a voltage amplifier and a power
amplifier?
03
(b) Draw Ebers-Moll model and ?-model of a transistor. 04
(c) Explain the working of a transformer coupled class A power
amplifier and show the efficiency of class A transformer coupled
amplifier is 50%.
07
OR
Q.5 (a) Explain the difference between class B and class AB Operation. 03
(b) Draw a schematic of class B push-pull amplifier and explain its
operation.
04
(c) Describe the characteristics of amplifiers, including classes of
operation, types of coupling, and frequency ranges.
07
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This post was last modified on 20 February 2020