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Posted Date: 05 May 2008 Posted By: kondapalli Member Level: Gold
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2007 Jawaharlal Nehru Technological University B.Tech Electronics & computers FAULT TOLERANT SYSTEMS set-3 Question paper
1. Define and derive the following terms in a system.
(a) MTTR [2+6]
(b) Hazard rate functions. [2+6]
2 . ( a ) Wha t is a t r ee like cir cuit . G ive pr o p er t ies o f t r ee like cir cuit s.
(b) For the given tree like circuit find the complete test set using path sensitizing
method as show in figure1. [3+5+8]
Figure 1:
3. (a) Explain fail soft-operation. [4]
(b) Explain the 5 MR reconfiguration mechanism and also explain how it care
tolerate single, double and Trible faults in a given system. [3x4=12]
4. With an example explain :
(a) software redundancy.
(b) time redundancy. [8+8]
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. (a) Prove that five tests are sufficient to detect all faults in a combinational logic
circuit by inserting addition control logic to the following function, obtain the
test pattern.
f=(A,B,C,D)=AB+BC+BD
(b) Obtain the ten sequences denoted as P = {xox1......xa} from the basic module
of the above circuit and get the compatable pair from the set P. [8+8]
8. (a) Draw the logic diagram of Built-in Logic Block Observer.
(b) Discuss BILBO based BIST architecture. [8+8]
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