Download VTU ((Visvesvaraya Technological University) B.E/B-Tech 2019 July ( Bachelor of Engineering) First & Second Semester (1st Semester & 2nd Semester) 17 Scheme 17ELN15 Basic Electronics Question Paper
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17ELN 15/25
First/Second Semester 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 in ?dale.
Module-1
1 a. What is PN junction diode? With the help of circuit diagram, explain the VI
of a diode.
b. What is rectifier circuit? Explain the classification of the rectifier. Derive
expressions for Half-wave rectifier: (i) ld
e
/I (iv) y
c. Design a Zener diode voltage regulator circuit to meet the following
I
L
= 20 mA, Vo = 5V, P
Z
= 500 mW, Vi = 12 ? 2V and
lzmin =
8 mA.
characteristics
(07 Marks)
the following
(08 Marks)
specifications:
(05 Marks)
OR
2 a. What is a transistor? What are its applications? Explain the various current gains in a
transistor and derive the relation between a and I. (07 Marks)
b. With a neat circuit diagram, explain the input and output characteristics of the common
emitter configuration. (08 Marks)
c. Explain the operation of full wave rectifier with capacitor filter. (05 Marks)
Module-2
3 a. For the base bias circuit, Vcc = 18V, R
c
- = 2.2 KO, RB = 470 K1 and = 100. Find I
B , Ic
and Va. Draw the DC load line and locate the operating point. (07 Marks)
b. Draw the circuit diagram of the voltage divider biasing circuit. Derive the expressions of Is
and VcE. (05 Marks)
c. List out the various deal op-amp characteristics. Explain the terms CMRR and Slew rate.
(08 Marks)
OR
4 a. Derive the output equation of the inverting adder. Design an adder op-amp circuit to obtain
an output voltage = ?(0.1V, + 0.5V, + 20V, ). Select Rf = 10 KO. (07 Marks)
b. What is an integrator? Derive its output equation. (05 Marks)
c. Derive the output expressions for the following op-amp applications:
(i) Voltage follower (ii) Subtractor (08 Marks)
Module-3
5 a. What are Radix-2, Radix-8, Radix-10 and Radix-16 number system? Perform the following
operations:
i) (1234.56)8 = (?)
10
ii) (BAD.DAD)
in
= ( ?)8 iii)
(988.86)1o= (?)I6
(08 Marks)
b. Perform the following using 2's complement method:
i)
(15)io
?
(28)io
ii) (1011.10)2? 0000.002 (05 Marks)
c. Write the symbol and truth table of the following gates:
i) AND ii) NOR iii) XOR iv) NAND (07 Marks)
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0
0
0
V
4.
O
17ELN 15/25
First/Second Semester 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 in ?dale.
Module-1
1 a. What is PN junction diode? With the help of circuit diagram, explain the VI
of a diode.
b. What is rectifier circuit? Explain the classification of the rectifier. Derive
expressions for Half-wave rectifier: (i) ld
e
/I (iv) y
c. Design a Zener diode voltage regulator circuit to meet the following
I
L
= 20 mA, Vo = 5V, P
Z
= 500 mW, Vi = 12 ? 2V and
lzmin =
8 mA.
characteristics
(07 Marks)
the following
(08 Marks)
specifications:
(05 Marks)
OR
2 a. What is a transistor? What are its applications? Explain the various current gains in a
transistor and derive the relation between a and I. (07 Marks)
b. With a neat circuit diagram, explain the input and output characteristics of the common
emitter configuration. (08 Marks)
c. Explain the operation of full wave rectifier with capacitor filter. (05 Marks)
Module-2
3 a. For the base bias circuit, Vcc = 18V, R
c
- = 2.2 KO, RB = 470 K1 and = 100. Find I
B , Ic
and Va. Draw the DC load line and locate the operating point. (07 Marks)
b. Draw the circuit diagram of the voltage divider biasing circuit. Derive the expressions of Is
and VcE. (05 Marks)
c. List out the various deal op-amp characteristics. Explain the terms CMRR and Slew rate.
(08 Marks)
OR
4 a. Derive the output equation of the inverting adder. Design an adder op-amp circuit to obtain
an output voltage = ?(0.1V, + 0.5V, + 20V, ). Select Rf = 10 KO. (07 Marks)
b. What is an integrator? Derive its output equation. (05 Marks)
c. Derive the output expressions for the following op-amp applications:
(i) Voltage follower (ii) Subtractor (08 Marks)
Module-3
5 a. What are Radix-2, Radix-8, Radix-10 and Radix-16 number system? Perform the following
operations:
i) (1234.56)8 = (?)
10
ii) (BAD.DAD)
in
= ( ?)8 iii)
(988.86)1o= (?)I6
(08 Marks)
b. Perform the following using 2's complement method:
i)
(15)io
?
(28)io
ii) (1011.10)2? 0000.002 (05 Marks)
c. Write the symbol and truth table of the following gates:
i) AND ii) NOR iii) XOR iv) NAND (07 Marks)
17ELN 15/25
OR
6 a. Simplify and realize the following Boolean expressions using basic gates:
i) Y=ABC+ABC+AB+AB
ii) Y = ABC + ABC + ABt+ ABC
iii) Y = (A +B)(A +C)(B+C) (08 Marks)
b. Implement XOR gate using only NOR gates. (05 Marks)
c. Write truth table of half-adder and full-adders. Realize the full-adder using two half-adders.
(07 Marks)
Module-4
7 a. What is flip-flop and latch? Explain the operation of SR latch using NAND gates. (07 Marks)
b. Explain the working of clocked SR flip-flop with a suitable logic diagram and a truth table.
(08 Marks)
c. Explain the working of NAND gate latch and NOR gate latch. (05 Marks)
OR
8 a. What is microcontroller? List out the main features of 8051 microcontroller. (05 Marks'
b. With a neat block diagram, explain the architecture of 8051 microcontroller. (09 Marks)
c. What is stepper motor? Explain the working and interfacing of stepper motor to a 8051
microcontroller. (06 Marks)
Module-5
9 a. What is amplitude modulation and frequency modulation? With the help of neat waveform,
derive the expression for AM wave. (07 Marks)
b. A carrier signal with Ac = 40 V and f
e
= 1 MHz is amplitude modulated with a modulating
signal A? = 4V and f
m
= 2.5 kHz. The depth of the modulation is 75%. Calculate the
following: (i) Pc (ii) P
T
(iii) Psa (iv) BW (v) Sideband frequencies.
Assume R =
(07 Marks)
c. What is demodulation? Explain the working of AM detector circuit. (06 Marks)
OR
10 a. What is transducer? Explain the working of resistance transducer and resistance
thermometer. (07 Marks1
b. What is LVDT? Explain the construction, operation and applications of LVDT. (07 Marks,__
c. Explain the working of piezoelectric and photoelectric transducers. (06 Marks)
* * * * * E. SOciet
Yip
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This post was last modified on 01 January 2020