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Reliability Engineering (Elective II) (April 2010)

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Total No. of Questions : 12] [Total No. of Pages : 7 [3764]-148 P1316 B.E. (Mechanical) RELIABILITY ENGINEERING (Elective - II) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer three questions from each section. 2) Attempt Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6 from Section I. 3) Attempt Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12 from Section II. 4) Neat diagrams must be drawn wherever necessary. 5) Assume suitable data, if necessary. 6) Figures to the right indicate full marks. 7) Use of non-programmable electronic calculators is allowed. SECTION - I Q1) a) In a survival test conducted on 100 cardboard boxes for their strength under impact loading, the following results were obtained. [10] No. of impacts 20 22 24 26 29 32 35 37 40 Number of boxes failed 7 10 15 14 15 13 13 8 5 Calculate failure density, hazard rate and reliability. b) The random variation w.r.t. time in the output voltage of systems are exponentially distributed with mean value of 100 V. What is the probability that the output voltage will be found at any time to lie in the range of 90-110V. [8] Q2) a) Explain availability and maintainability. Explain the types of availability in detail. [8] P.T.O.

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Additional Info : 2003 Course
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