Download VTU ((Visvesvaraya Technological University) B.E/B-Tech 2019 July ( Bachelor of Engineering) First & Second Semester (1st Semester & 2nd Semester) 18 Scheme 18ELN14 Basic Electronics Question Paper
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USN
FirZiNeeOritrSemester B.E. Degree Examination, June/July 2019
Basic Electronics
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
1 a. What is semiconductor diode? Explain the different equivalent circuits of diode. (06 Marks)
b. Explain the working of photodiode. (05 Marks)
c. With a neat circuit diagram and waveforms, explain the working of full wave bridge
rectifier. Also derive Vd
c
and V., values for full wave rectifier. (09 Marks)
2 a.
b.
c.
OR
A full wave rectifier uses 2 diodes having internal resistance of 200 each. The transformer
rms secondary voltage from centre to each end is 50V. Find Im,
Idc, Irms
and Vd
c
if the load is
98052 (06 Marks)
Explain the functional block diagram of 78x x series voltage regulator. (06 Marks)
Explain how Zener diode can be used as a voltage regulator. Give detail mathematical
analysis. (08 Marks)
3 a.
b.
C.
Module-2
With a neat circuit diagram explain the working of CMOS inverter.
For a N-channel JFFT if IDSS = 8mA and V
p
= ?5V, calculate ID at V
as
=
ID = 3mA.
Explain the construction, working and characteristics of N- channel JFET.
(06 Marks)
?3V and V
as
at
(05 Marks)
(09 Marks)
OR
4 a. Explain the working of SCR using two transistor model. (06 Marks)
b. What is commutation in SCR? Explain two types of commutation. (05 Marks)
c. Explain the construction, working and characteristics of enhancement type MOSFET.
(09 Marks)
Module-3
5 a. What is Op ? AMP? List the characteristics of ideal Op ? Amp.
b. Explain how Op ? Amp can be used as i) Integrator ii) Voltage Follower.
c. Find the output of the Op ? Amp circuit shown in Fig Q5(c) below
C
(06 Marks)
(08 Marks)
C,
?vc.c
Fig Q5(c)
(06 Marks)
1 of 2
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18ELN14/24
c. Societyg
o
USN
FirZiNeeOritrSemester B.E. Degree Examination, June/July 2019
Basic Electronics
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full question from each module.
Module-1
1 a. What is semiconductor diode? Explain the different equivalent circuits of diode. (06 Marks)
b. Explain the working of photodiode. (05 Marks)
c. With a neat circuit diagram and waveforms, explain the working of full wave bridge
rectifier. Also derive Vd
c
and V., values for full wave rectifier. (09 Marks)
2 a.
b.
c.
OR
A full wave rectifier uses 2 diodes having internal resistance of 200 each. The transformer
rms secondary voltage from centre to each end is 50V. Find Im,
Idc, Irms
and Vd
c
if the load is
98052 (06 Marks)
Explain the functional block diagram of 78x x series voltage regulator. (06 Marks)
Explain how Zener diode can be used as a voltage regulator. Give detail mathematical
analysis. (08 Marks)
3 a.
b.
C.
Module-2
With a neat circuit diagram explain the working of CMOS inverter.
For a N-channel JFFT if IDSS = 8mA and V
p
= ?5V, calculate ID at V
as
=
ID = 3mA.
Explain the construction, working and characteristics of N- channel JFET.
(06 Marks)
?3V and V
as
at
(05 Marks)
(09 Marks)
OR
4 a. Explain the working of SCR using two transistor model. (06 Marks)
b. What is commutation in SCR? Explain two types of commutation. (05 Marks)
c. Explain the construction, working and characteristics of enhancement type MOSFET.
(09 Marks)
Module-3
5 a. What is Op ? AMP? List the characteristics of ideal Op ? Amp.
b. Explain how Op ? Amp can be used as i) Integrator ii) Voltage Follower.
c. Find the output of the Op ? Amp circuit shown in Fig Q5(c) below
C
(06 Marks)
(08 Marks)
C,
?vc.c
Fig Q5(c)
(06 Marks)
1 of 2
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18ELN14/24
OR
6 a. Explain the following terms with respect to Op ? Amp
i) CMRR ii) Slew Rate iii) Output offset voltage iv) Supply voltage Rejection Ratio.
(08 Marks)
b. Design on Op ? Amp circuit to obtain output expression as Vo = ? [V1 + 3V2 + 5V3].
(06 Marks)
c. Explain how Op ? Amp can be used as differentiator. (06 Marks)
Module-4
7 a. What is feedback amplifier? What are the properties of negative feedback amplifier?
(06 Marks)
b. Explain how transistor can be used as an amplifier. (06 Marks)
c.
With a neat circuit diagram and waveforms, explain the working of 555 timers as an
oscillator. (08 Marks)
OR
8 a. Draw the block diagram of voltage series negative feedback amplifier and derive the
expression for its voltage gain. (06 Marks)
b. Design a RC phase shift oscillator for a frequency of 1 KHz. Draw the circuit diagram with
designed values. (06 Marks)
c. With a neat circuit diagram, explain the working of Wein Bridge oscillator. (08 Marks)
Module-5
9 a. Perform the following :
i) Convert (925.75)10 to base ? 2 and base - 16
ii) Subtract from (11011.11)2 from (10101.11) 2 using 2's compliment method. (06 Marks)
b. With a block diagram explain the working of 3-bit asynchronous counter. (06 Marks)
c. What is multiplexer? Implement 8:1 multiplexer using basic gates. (08 Marks)
OR
10 a. Simplify S = A C
-
.) B (DC and realize using basic gates.
b. What is flip-flop? Explain the operation of master slave JK flip flop.
c. I mplement full adder using two half adders.
d. With a block diagram, explain the working of basic communication system.
(05 Marks,
(06 Marks)
(04 Marks)
(05 Marks)
2 of 2
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This post was last modified on 01 January 2020