Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2131004 Digital Electronics Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2131004 Date:05/12/2018
Subject Name: Digital Electronics
Time:10:30 AM TO 01:00 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) Convert the following numbers form given base to the base
indicates.
1. (AEF2.B6)16 = (_______)2
2. (674.12)8 = (________)10
3. (110110.1011)2 = (________)16
03
(b) Solve the following Boolean functions by using K-Map. Implement the
simplified function by using logic gates
F = (w,x,y,z) = ? (0,1,4,5,6,8,9,10,12,13,14)
04
(c) With a neat block diagram explain the function of encoder. Explain
priority encoder?
07
Q.2 (a) Define State Machine 03
(b) Discuss Clocked R-S Flip-flop with Logic diagram, Symbol,
Characteristic table and Characteristic equation
04
(c) Design a counter for following binary sequence 0-1-3-4-6-0. 07
OR
(c)
Implement the following Boolean functions with a multiplexer and Decoder.
F(w, x, y, z) = ? (2, 3, 5, 6, 11, 14, 15)
07
Q.3 (a) What is ?Lock out? condition in counter? How to avoid it. 03
(b) List down the various types of ROMs and discuss and two of them. 04
(c) With suitable design example discuss the basic design principles of
Asynchronous State Machines design.
07
OR
Q.3 (a) Draw the Characteristic tables of following Flip-flop.
1. R-S 2. J-K 3. T
03
(b) Design a combinational logic circuit whose output is high only when
majority of inputs (A, B, C, D) are low.
04
(c) Implement the following function with NAND and NOR Gate.
F(a,b,c) = ? (0,6)
07
Q.4 (a) Discuss the advantages and disadvantages of TTL Logic Family. 03
(b) List down the modes of Asynchronous Sequential Machine and discuss
any one in detail.
04
(c) Determine the minimum state table equivalent shown in following table
and draw the reduce state diagram.
07
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
www.FirstRanker.com
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2131004 Date:05/12/2018
Subject Name: Digital Electronics
Time:10:30 AM TO 01:00 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) Convert the following numbers form given base to the base
indicates.
1. (AEF2.B6)16 = (_______)2
2. (674.12)8 = (________)10
3. (110110.1011)2 = (________)16
03
(b) Solve the following Boolean functions by using K-Map. Implement the
simplified function by using logic gates
F = (w,x,y,z) = ? (0,1,4,5,6,8,9,10,12,13,14)
04
(c) With a neat block diagram explain the function of encoder. Explain
priority encoder?
07
Q.2 (a) Define State Machine 03
(b) Discuss Clocked R-S Flip-flop with Logic diagram, Symbol,
Characteristic table and Characteristic equation
04
(c) Design a counter for following binary sequence 0-1-3-4-6-0. 07
OR
(c)
Implement the following Boolean functions with a multiplexer and Decoder.
F(w, x, y, z) = ? (2, 3, 5, 6, 11, 14, 15)
07
Q.3 (a) What is ?Lock out? condition in counter? How to avoid it. 03
(b) List down the various types of ROMs and discuss and two of them. 04
(c) With suitable design example discuss the basic design principles of
Asynchronous State Machines design.
07
OR
Q.3 (a) Draw the Characteristic tables of following Flip-flop.
1. R-S 2. J-K 3. T
03
(b) Design a combinational logic circuit whose output is high only when
majority of inputs (A, B, C, D) are low.
04
(c) Implement the following function with NAND and NOR Gate.
F(a,b,c) = ? (0,6)
07
Q.4 (a) Discuss the advantages and disadvantages of TTL Logic Family. 03
(b) List down the modes of Asynchronous Sequential Machine and discuss
any one in detail.
04
(c) Determine the minimum state table equivalent shown in following table
and draw the reduce state diagram.
07
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
www.FirstRanker.com
2
q
X=0 X=1
N.S. O/P N.S. O/P
1. 1 0 1 0
2. 1 1 6 1
3. 4 0 5 0
4. 1 1 7 0
5. 2 0 3 0
6. 4 0 5 0
7. 2 0 3 0
OR
Q.4 (a) Sate and prove DeMorgan Theorem. 03
(b) Explain Serial Transfer w.r.t Shift Register with suitable example. 04
(c) Design a 3-bit gray to binary code converter. Implement it using suitable
PROM. Draw the necessary diagrams and tables.
07
Q.5 (a) Explain following terms w.r.t Digital Logic Family.
1. Fan-in 2.Noise Margin 3. Power Dissipation
03
(b) Simplify the following Boolean functions to a minimum numbers of
literals.
1. x + x?y 2. x (x?+y) 3. x?y?z + x?yz + xy? 4. xy + x?z +yz
04
(c) Design a 3-bit binary counter. 07
OR
Q.5 (a) Define following terms w.r.t State Machine.
1. State Table 2. State Diagram.
03
(b) Describe General State Machine Architecture with suitable diagrams. 04
(c) Which are the various problems of Asynchronous Circuits? Explain any
four in detail.
07
**************
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020