Exam Details
| Subject | Electronic Switching Circuits | |
| Paper | ||
| Exam / Course | BTCVI / BTECVI / BTELVI | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 4 IBIELE-OI2I
B.Tech. -VIEP -ELECTRONICS AND COMMUNICATION ENGINEERING (BTECVI) Term-End Examination
___ t
June, 2016
BIELE-012 ELECTRONIC SWITCHING CIRCUITS
Time: 3 hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Assume missing data, if any. Use of scientific calculator is permitted.
1. Show how a J-K flip-flop can be converted into a D flip-flop. Explain the change in behaviour by analysing its gate equivalent circuit. 6
Give the classification of sequential circuits. 4
2. A sequential circuit has two D flip-flops, A and two inputs, x and and one output, z. The flip-flop input equations and circuits output are as follows
DA=x'y xA, xA, z=B Draw the logic diagram of the circuit. Tabulate the state table. 10
3. Design a two-input, two-output synchronous sequential circuit, which produces an output z 1 whenever any of the following input sequences occur: 1100, 1010 and 1001. The circuit resets to its initial state after a output has been generated. Form the state diagram and state table. Draw the logic circuit. 10
4. Determine the conditions under which two equivalent machines are isomorphic. 4
Prove that, to every q-output, n-state Mealy Machine, there corresponds a q-output Moore Machine which accepts exactly the same sequences and has no more, than qn 1 states. 6
5. For the flow table given below, determine all the essential output hazards and essential internal variable hazards. <img src='./qimages/11074-5.jpg'> <br><br>
6. A memory device has two binary inputs, Y1 and Y2, and three binary outputs Y1, Y2 and Y3. When Y1 is pulse, both Y1 and Y2 are complemented. It is not allowed to pulse Y1 and Y2 simultaneously. Use one such device to realize pulse sequential circuit shown in the table.
PS NS x1 x2 Z
A D A 0
B C D 0
C A B 0
D B B 1
7. Prove that if a circuit is designed, so that it is hazard-free in its tie-sets, then it is also hazard-free in its cut-sets. 10
8. Briefly discuss how the static hazards are produced in combinational circuits. How can they be eliminated 10
9. Briefly discuss symmetric functions. List all the properties of symmetric functions. 10
10. Write notes on any two of the following: 2x5=10 Contact Network Identification of Symmetric Functions Sequence generator for generating the sequence 01100
B.Tech. -VIEP -ELECTRONICS AND COMMUNICATION ENGINEERING (BTECVI) Term-End Examination
___ t
June, 2016
BIELE-012 ELECTRONIC SWITCHING CIRCUITS
Time: 3 hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Assume missing data, if any. Use of scientific calculator is permitted.
1. Show how a J-K flip-flop can be converted into a D flip-flop. Explain the change in behaviour by analysing its gate equivalent circuit. 6
Give the classification of sequential circuits. 4
2. A sequential circuit has two D flip-flops, A and two inputs, x and and one output, z. The flip-flop input equations and circuits output are as follows
DA=x'y xA, xA, z=B Draw the logic diagram of the circuit. Tabulate the state table. 10
3. Design a two-input, two-output synchronous sequential circuit, which produces an output z 1 whenever any of the following input sequences occur: 1100, 1010 and 1001. The circuit resets to its initial state after a output has been generated. Form the state diagram and state table. Draw the logic circuit. 10
4. Determine the conditions under which two equivalent machines are isomorphic. 4
Prove that, to every q-output, n-state Mealy Machine, there corresponds a q-output Moore Machine which accepts exactly the same sequences and has no more, than qn 1 states. 6
5. For the flow table given below, determine all the essential output hazards and essential internal variable hazards. <img src='./qimages/11074-5.jpg'> <br><br>
6. A memory device has two binary inputs, Y1 and Y2, and three binary outputs Y1, Y2 and Y3. When Y1 is pulse, both Y1 and Y2 are complemented. It is not allowed to pulse Y1 and Y2 simultaneously. Use one such device to realize pulse sequential circuit shown in the table.
PS NS x1 x2 Z
A D A 0
B C D 0
C A B 0
D B B 1
7. Prove that if a circuit is designed, so that it is hazard-free in its tie-sets, then it is also hazard-free in its cut-sets. 10
8. Briefly discuss how the static hazards are produced in combinational circuits. How can they be eliminated 10
9. Briefly discuss symmetric functions. List all the properties of symmetric functions. 10
10. Write notes on any two of the following: 2x5=10 Contact Network Identification of Symmetric Functions Sequence generator for generating the sequence 01100
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