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Posted By: kondapalli Member Level: Gold Posted Date: 05 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & computers FAULT TOLERANT SYSTEMS Question paper
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1. (a) How does a feedback briding fault leads the circuit into oscillation. What are
the conditions? [4+4]
(b) What are temporary faults? Differentiate between Transient faults and inter-
mittent faults. Which one is preferrable? [3+2+2+1]
2. (a) A circuit realizes the function.
Z=X1 X4+X2 X3+X1X4
Using Boolean Difference method find the test vectors for SA0, SA1 faults on
all input lines of the circuit.
(b) What are the different properties of Boolean differences? Explain [5+5+6]
3. (a) Construct a seven-bit error correcting code to represent the decimal digit by
augmenting the Excess-3 code and by using add-1 parity check.
(b) Design a redundant circuit for f = a b [9+7]
4. (a) What is the mechanism adopted in COPRA a fault Tolerant system. Explain
in detail.
(b) What is meant by Time redundancy? Explain. [4+4+4+4]
5. (a) What is the need for self checking circuits
(b) Design a totally self checking checker by using reddy’s partition method for
2out of 5 code. [6+10]
6. Explain in detail about fail-safe sequential circuits design with an example. [16]
7. Write a short notes an [4x4=16]
(a) Controllability
(b) Observability
(c) Positive unate function
(d) Syndrom relations of all types of terminating gates.
8. (a) Discuss the sequential circuit design using nonscan techniques.
(b) i. What is meant by Enhanced controllability?
ii. How is a sequential circuit modified for the above sequential circuit and
enhanced controllability? [6+4+6]
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