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2003 Course Reliability Eng.

7 pages, 34 questions, 0 questions with responses, 0 total responses,

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Total No. of Questions : 11] [Total No. of Pages : 7 [3764]-175 P1468 B.E. (Production / Production S/W) RELIABILITY ENGINEERING (411085) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer any 3 questions from each section. 2) Question No. 11 is compulsory. Out of the remaining attempt 3 questions from section I and 2 questions from Section II. 3) Answers to the two sections should be written in separate books. 4) Neat diagrams must be drawn wherever necessary. 5) You are advised to attempt not more than 3 questions. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) A series of tests conducted under certain stipulated conditions on 800 electronic components. The total duration of tests is 15 hrs. The number of components that fail during each hourly interval is noted. The results obtained are tabulated as shown in table. Time (t) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 No. of failures 00 120 85 71 62 53 45 41 37 35 29 50 45 63 35 29 Based on the failure data or survival test results shown in table. Define & calculate failure density (fd) : failure rate (Z) and Reliability (R). [12] b) Explain with neat sketch different failure modes of Bath tub curve.[4] OR Q2) a) In order to test the strength of a new glue, ten similar structures constructed using the glue were subjected to a continuous vibratory load, and the duration of survival of each structure was noted, the values obtained the following: Specimen Number 01 02 03 04 05 06 07 08 09 10 Hours of Survival 60 62 58 50 61 55 59 62 54 55 Calculate the mean time to failures (MTTF) from this data. [6] P.T.O.

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