Code No: RR410506

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Set No. 2

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IV B.Tech I Semester Supplementary Examinations,June 2010 FAULT TOLERANT SYSTEMS Common to Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. With an example explain:

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(a) software redundancy.

(b) time redundancy.

[8+8]

2. (a) When do you say that the circuit is strongly fault-secure circuit? Explain.

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or

(b) Design a totally self checking Mealy-type synchronous sequential machine presented by ozguner specified by the state table shown below. [6+10] NS, Z PS 00 01 10 11 A B,0 B,1 D,1 A,1 B B,0 C,0 D,1 A,1 C A,0 D,0 C,0 A,1 D B,0 A,0 D,0 A,0   6 3. (a) Construct a self-checking checker for code. 1

(b) Design, construct and explain the self-checking Berger code checker.

[6+10]

4. (a) What are the draw backs of Reed-Muller expansion Technique? (b) What is an unate function?

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(c) Give the design procedure for a completely fault locatable network for unate function. [6+4+6]

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5. Derive the Reliability factor of TMR and Triplicathd TMR systems. Show that R(t) of Triplicated TMR is better than R(t) of TMR system. [16] 6. (a) What is a tree-like circuit. Give properties of tree-like circuits. (b) For the given tree-like circuit shown in figure 6b, find the complete test set using path sensitizing method. [8+8]

1

RR

Set No. 2

Figure 6b 7. (a) What is meant by circular BIST technique?

[8+8]

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(b) Give a simplified configuration of circular BIST and explain.

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Code No: RR410506

8. (a) A computer system contains 10,000 components each with failure rate 0.5% per 1000 hours. What is the period of 0.99 reliability of this system?

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(b) What is meant by active repair time and passive repair time referred in maintainability of a system? Derive the expression for the MTTR. [6+10]

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?????

2

Code No: RR410506

RR

Set No. 4

in

IV B.Tech I Semester Supplementary Examinations,June 2010 FAULT TOLERANT SYSTEMS Common to Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????

ld .

1. Derive the Reliability factor of TMR and Triplicathd TMR systems. Show that R(t) of Triplicated TMR is better than R(t) of TMR system. [16] 2. (a) What is meant by circular BIST technique? (b) Give a simplified configuration of circular BIST and explain.

[8+8]

4. With an example explain:

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(a) software redundancy. (b) time redundancy.

or

3. (a) A computer system contains 10,000 components each with failure rate 0.5% per 1000 hours. What is the period of 0.99 reliability of this system. (b) What is meant by active repair time and passive repair time referred in maintainability of a system. Derive the expression for the MTTR. [6+10]

[8+8]

nt

5. (a) When do you say that the circuit is strongly fault-secure circuit? Explain. (b) Design a totally self checking Mealy-type synchronous sequential machine presented by ozguner. Value the state table is as shown below. [6+10] NS, Z PS 00 01 10 11 A B,0 B,1 D,1 A,1 B B,0 C,0 D,1 A,1 C A,0 D,0 C,0 A,1 D B,0 A,0 D,0 A,0

Aj

6. (a) What is a tree live circuit. Give properties of tree like circuits. (b) For the given tree like circuit find the complete test set using path sensitizing method as show in figure 8b. [8+8]

Figure 8b 3

Code No: RR410506

RR

Set No. 4

7. (a) What are the draw backs of Reed-Muller expansion Technique. (b) What is an unate function?

in

(c) Give the design procedure for a completely fault locatable networks for unate function. [6+4+6]   6 8. (a) Construct a self-checking checker for code. 1 (b) Design, construct and explain the self-checking Berger code checker.

Aj

nt

uW

or

ld .

?????

[6+10]

4

Code No: RR410506

RR

Set No. 1

in

IV B.Tech I Semester Supplementary Examinations,June 2010 FAULT TOLERANT SYSTEMS Common to Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What is a tree live circuit. Give properties of tree like circuits.

or

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(b) For the given tree like circuit find the complete test set using path sensitizing method as show in figure 8b. [8+8]

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Figure 8b

2. With an example explain:

(a) software redundancy. (b) time redundancy.

[8+8]

3. (a) What is meant by circular BIST technique? (b) Give a simplified configuration of circular BIST and explain.

[8+8]

nt

4. Derive the Reliability factor of TMR and Triplicathd TMR systems. Show that R(t) of Triplicated TMR is better than R(t) of TMR system. [16] 5. (a) What are the draw backs of Reed-Muller expansion Technique.

Aj

(b) What is an unate function?

(c) Give the design procedure for a completely fault locatable networks for unate function. [6+4+6]   6 6. (a) Construct a self-checking checker for code. 1 (b) Design, construct and explain the self-checking Berger code checker.

[6+10]

7. (a) When do you say that the circuit is strongly fault-secure circuit? Explain.

5

Code No: RR410506

RR

Set No. 1

in

(b) Design a totally self checking Mealy-type synchronous sequential machine presented by ozguner. Value the state table is as shown below. [6+10] NS, Z PS 00 01 10 11 A B,0 B,1 D,1 A,1 B B,0 C,0 D,1 A,1 C A,0 D,0 C,0 A,1 D B,0 A,0 D,0 A,0 8. (a) A computer system contains 10,000 components each with failure rate 0.5% per 1000 hours. What is the period of 0.99 reliability of this system.

Aj

nt

uW

or

?????

ld .

(b) What is meant by active repair time and passive repair time referred in maintainability of a system. Derive the expression for the MTTR. [6+10]

6

Code No: RR410506

RR

Set No. 3

in

IV B.Tech I Semester Supplementary Examinations,June 2010 FAULT TOLERANT SYSTEMS Common to Electronics And Computer Engineering, Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????

ld .

1. Derive the Reliability factor of TMR and Triplicathd TMR systems. Show that R(t) of Triplicated TMR is better than R(t) of TMR system. [16] 2. (a) When do you say that the circuit is strongly fault-secure circuit? Explain.

uW

or

(b) Design a totally self checking Mealy-type synchronous sequential machine presented by ozguner. Value the state table is as shown below. [6+10] NS, Z PS 00 01 10 11 A B,0 B,1 D,1 A,1 B B,0 C,0 D,1 A,1 C A,0 D,0 C,0 A,1 D B,0 A,0 D,0 A,0   6 3. (a) Construct a self-checking checker for code. 1 (b) Design, construct and explain the self-checking Berger code checker.

[6+10]

4. (a) What are the draw backs of Reed-Muller expansion Technique. (b) What is an unate function?

nt

(c) Give the design procedure for a completely fault locatable networks for unate function. [6+4+6] 5. With an example explain:

(a) software redundancy.

[8+8]

Aj

(b) time redundancy.

6. (a) What is meant by circular BIST technique? (b) Give a simplified configuration of circular BIST and explain.

[8+8]

7. (a) A computer system contains 10,000 components each with failure rate 0.5% per 1000 hours. What is the period of 0.99 reliability of this system. (b) What is meant by active repair time and passive repair time referred in maintainability of a system. Derive the expression for the MTTR. [6+10] 8. (a) What is a tree live circuit. Give properties of tree like circuits. 7

Code No: RR410506

RR

Set No. 3

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nt

uW

or

?????

ld .

Figure 8b

8

in

(b) For the given tree like circuit find the complete test set using path sensitizing method as show in figure 8b. [8+8]

RR Set No. 2

(a) When do you say that the circuit is strongly fault-secure circuit? Explain. (b) Design a totally self checking Mealy-type synchronous sequential machine pre-.
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