Download PTU B.Tech 2020 March Automation-And-Robotics Question Paper 3rd Sem BTAR 302 Electronics Devices And Digital Circuits

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech Automation-And-Robotics 3rd Sem BTAR 302 Electronics Devices And Digital Circuits 2020 March Previous Question Paper

1 | M-63002 (S2)-1100
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2012 & Onwards) (Sem.?3)
ELECTRONICS DEVICES AND DIGITAL CIRCUITS
Subject Code : BTAR-302
M.Code : 63002
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Draw a hybrid model for a linear circuit having V
i
, I
i
is input voltage, current and V
o
, I
o

is output voltage, current.
b) Draw the circuit indicating the use of 78XX as an adjustable voltage regulator. Also
write the expression for output voltage.
c) An op-amp has an open-loop gain of 90,000. V
sat
= +13V. A differential voltage of
0.1Vpp is applied between the inputs. What is the output voltage?
d) What is a key characteristic of an instrumentation amplifier?
e) Define Monostable Multivibrator. Why it is called one-shot multivibrator?
f) What is K-map?
g) What is the advantage of D-flip-flop over an S-R flip-flop?
h) Differentiate between Demultiplexer and Decoder.
i) What is the maximum modulus for a counter with 4 numbers of flip-flops?
j) Draw the circuit diagram of mono-stable multivibrator using NPN transistors.
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1 | M-63002 (S2)-1100
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2012 & Onwards) (Sem.?3)
ELECTRONICS DEVICES AND DIGITAL CIRCUITS
Subject Code : BTAR-302
M.Code : 63002
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Draw a hybrid model for a linear circuit having V
i
, I
i
is input voltage, current and V
o
, I
o

is output voltage, current.
b) Draw the circuit indicating the use of 78XX as an adjustable voltage regulator. Also
write the expression for output voltage.
c) An op-amp has an open-loop gain of 90,000. V
sat
= +13V. A differential voltage of
0.1Vpp is applied between the inputs. What is the output voltage?
d) What is a key characteristic of an instrumentation amplifier?
e) Define Monostable Multivibrator. Why it is called one-shot multivibrator?
f) What is K-map?
g) What is the advantage of D-flip-flop over an S-R flip-flop?
h) Differentiate between Demultiplexer and Decoder.
i) What is the maximum modulus for a counter with 4 numbers of flip-flops?
j) Draw the circuit diagram of mono-stable multivibrator using NPN transistors.
2 | M-63002 (S2)-1100
SECTION-B
2. Draw the equivalent circuit of a common emitter amplifier in terms of h- and obtain the
expression for voltage gain. (2.5+25)
3. Define and explain filter voltage Regulation and ripple voltage. (2.5+2.5)
4. Draw the schematic diagram of a peak detector using an operational amplifier and explain
its working. (2+3)
5. Draw the block diagram of VCO. Explain its working in details. Also write down the
expression for centre-operating frequency f
0
. (1 +2+2)
6. Draw and explain the working of Master-Slave JK flip-flop. (1.5+3.5)

SECTION-C
7. What is a Schmitt trigger? Draw the schematic diagram of Schmitt trigger explain its
working in details. How does it differ from a comparator? (2+6+2)
8. Draw and explain the working of a 555 timer connected as a mono-stable multivibrator.
Derive the relation for the time interval during which the output remains high. (7+3)
9. Draw and explain the working of a circulating register or ring counter. (3+7)





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page of Answer Sheet will lead to UMC against the Student.
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