Download VTU ((Visvesvaraya Technological University) B.E/B-Tech 2019 July ( Bachelor of Engineering) First & Second Semester (1st Semester & 2nd Semester) 2015 June-July 14ELN15 Basic Electronics Question Paper
First / Second Semester B.E. Degree Examination, June / July 2015
Basic Electronics
Explain the working of a full wave rectifier
the expressions for Id
e
and I??, of a full wave? ier.
Discuss in brief clamping circuit. Explain )
.
voildng of a negative damper.
Distinguish between Zener and Avalapehe breakdown.
L,q 2 diodes with neat diagram. Also derive
(10 Marks)
(04 Marks)
(06 Marks)
USN
Time: 3 hrs. Max. Marks:
? le%
Note: Answer any FIVE full questions, selecting ONE question from each
PART - A N
t
rb
1 a. Draw and explain V ? I characteristics of a Germanium Diode. (05 Marks)
b. Find the value of the series resistance R, required to drive a forty "'anent of 1.25mA
through a Germanium diode from a 4.5V battery. Write the circuittpagram showing all the
value.
?
V
(04 Marks)
c. With neat diagram, explain the working of a half wave Fier along with relevant
waveforms. (07 Marks)
0
d. Discuss in brief clipping circuit. Explain the working o ositive clipper with neat circuit
diagram and relevant waveforms.
a
(04 Marks)
0
2 a.
0
b.
c.
0
0
3 a.
(06 Marks)
b. For the base bias circuit ? 18V, R
e
= 2.2KC1 ? RB = 470k0 , hf
e
= 100 and VBE = 0.7V.
Find IB, l
c
and VcE. Dry e DC load line and indicate the Q point. (08 Marks)
(06 Marks)
a. Explain the voltage follower circuit using operational amplifier. Mention its important
properties.
(05 Marks)
b. Design an adder circuit using Op ? amp to obtain a
?
n output voltage of
Vo = 2[0.1 V
1
+ 0.5V2 + 2V31, where VI, V2 and V3 are input voltages. Draw the circuit
(08 Marks)
c. 4:11Mign a voltage divider bias circuit to operate from a 12V supply with VcE = 3V, VE = 5V
nd IC = 11I1A, VBE = 0.7V. (07 Marks)
PART - C
a. With the help of a diode switching circuit and truth table explain the operation of an AND
gate and OR gate.
(06 Marks)
b. State and prove Demorgan's theorem for three variables. (06 Marks)
c. With truth table and logical expressions, give the design of a full adder circuit. Realize the
circuit using i) Basic gates and ii) NAND gates.
(08 Marks)
6 a. Perform the following conversions :
i) (1234.56)8 = (?)la ii) (10110101001.101011)2= (?)16 iii) (988.86)10 = (?)2
iv) (532.65)i0 = (?)I6 v) (ABCD.EF)H = (?)s? (05 Marks)
C
1 of 2
0
0
0
0
0
0
0
0
0
0
0
0
0
PART -B
Calculate the value of Io, IE anc for a transistor with ad
c
= 0.98 and IB = 1201.A.
4(
c
"\
Discuss the ideal chtrra eristics of an operational amplifier.
0
0
0
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14ELN15/25
First / Second Semester B.E. Degree Examination, June / July 2015
Basic Electronics
Explain the working of a full wave rectifier
the expressions for Id
e
and I??, of a full wave? ier.
Discuss in brief clamping circuit. Explain )
.
voildng of a negative damper.
Distinguish between Zener and Avalapehe breakdown.
L,q 2 diodes with neat diagram. Also derive
(10 Marks)
(04 Marks)
(06 Marks)
USN
Time: 3 hrs. Max. Marks:
? le%
Note: Answer any FIVE full questions, selecting ONE question from each
PART - A N
t
rb
1 a. Draw and explain V ? I characteristics of a Germanium Diode. (05 Marks)
b. Find the value of the series resistance R, required to drive a forty "'anent of 1.25mA
through a Germanium diode from a 4.5V battery. Write the circuittpagram showing all the
value.
?
V
(04 Marks)
c. With neat diagram, explain the working of a half wave Fier along with relevant
waveforms. (07 Marks)
0
d. Discuss in brief clipping circuit. Explain the working o ositive clipper with neat circuit
diagram and relevant waveforms.
a
(04 Marks)
0
2 a.
0
b.
c.
0
0
3 a.
(06 Marks)
b. For the base bias circuit ? 18V, R
e
= 2.2KC1 ? RB = 470k0 , hf
e
= 100 and VBE = 0.7V.
Find IB, l
c
and VcE. Dry e DC load line and indicate the Q point. (08 Marks)
(06 Marks)
a. Explain the voltage follower circuit using operational amplifier. Mention its important
properties.
(05 Marks)
b. Design an adder circuit using Op ? amp to obtain a
?
n output voltage of
Vo = 2[0.1 V
1
+ 0.5V2 + 2V31, where VI, V2 and V3 are input voltages. Draw the circuit
(08 Marks)
c. 4:11Mign a voltage divider bias circuit to operate from a 12V supply with VcE = 3V, VE = 5V
nd IC = 11I1A, VBE = 0.7V. (07 Marks)
PART - C
a. With the help of a diode switching circuit and truth table explain the operation of an AND
gate and OR gate.
(06 Marks)
b. State and prove Demorgan's theorem for three variables. (06 Marks)
c. With truth table and logical expressions, give the design of a full adder circuit. Realize the
circuit using i) Basic gates and ii) NAND gates.
(08 Marks)
6 a. Perform the following conversions :
i) (1234.56)8 = (?)la ii) (10110101001.101011)2= (?)16 iii) (988.86)10 = (?)2
iv) (532.65)i0 = (?)I6 v) (ABCD.EF)H = (?)s? (05 Marks)
C
1 of 2
0
0
0
0
0
0
0
0
0
0
0
0
0
PART -B
Calculate the value of Io, IE anc for a transistor with ad
c
= 0.98 and IB = 1201.A.
4(
c
"\
Discuss the ideal chtrra eristics of an operational amplifier.
0
0
0
14ELN15/25
b. i) Subtract (1000.01)2 from (1011.10)2 using l's and 2's complement method.
ii) Add (7AB.67)16 with (15C.71)16.
c. Design a half adder circuit and realize using Basic gates and NAND gates.
d. What are Universal gates? Realise AND and OR gate using Universal gates.
PART - D
7 a. Distinguish between a Latch and flipflop.
b. Explain i) See beck effect ii) Peltier effect and iii) Thomson effect.
c. Explain the architecture of 8085 microprocessor, with neat diagram.
8 a. Explain the working of a LVDT with neat diagram.
b. List the difference between a microprocessor and micro controller.
c. Explain the working of a R ? S flipflop with relevant circuit and able.
(05 Marks)
(05 Marks)
(05 Marks)
(04 Marks)
(06 Marks)
(10 Marks)
(06 Marks)
(08 Marks)
(06 Marks)
PART -E
9 a. What is Modulation? Mention some of the need for modulation in communication system.
(06 Marks)
b. Give the comparison between AM and FM. (08 Marks)
c. With block diagram, explain the working of a cellular mobile communiC system.
10 a. Define Amplitude modulation and
waveforms. Draw the frequency spec
b. With neat diagram, explain the w
c. An audio frequency signal 10
50 sin(2E x 10
5
t). Calculate
i) Modulation index. ?-
1
Sideband frequencieei
,
'
iii) Band width. ?AS'
iv) Amplitude of eablisideband.
v) Total power delivered to a load of 60052.
vi) Transmi 'on efficiency.
Ylk Vt.&
(06 Marks)
derive the exp sio for AM wave with relevant
?91-
(08 Marks)
g of a telephone system. (06 Marks)
x 500)t is used to amplitude modulate a carrier of
(06 Marks)
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This post was last modified on 01 January 2020