Process Reliability and Maintainability 1. A system contains 4 units.

Process Reliability and Maintainability 1. A system contains 4 units. If unit 3 is fail the whole system is fail. Review (following exponential distribution, using data given b) a. Reliability of the system b. Failure rate of the system c. Meantime to failure d. Plot the system reliability vs time (hour) 2. For similar data given in problem 1, the arrangement of the system is change to be 2 out of 2 system, where following [unit1 unit2;unit3 and unit4]. Analyze (following exponential distribution) a. Reliability of the system b. Failure rate of the system c. Meantime to failure d. Plot the system reliability vs time (hour) The data is given below Unit 1 Unit 2 Unit 3 Unit 4 Time interval (hours) Number of Failure Number of Failure Number of Failure Number of Failure 0-100 160 120 260 300 100-200 86 98 120 250 200-300 78 72 88 100 300-400 70 62 80 120 400-500 64 34 75 80 500-600 58 23 70 60 600-700 52 20 65 52 700-800 43 15 55 50 800-900 42 10 43 30 900-1000 36 5 20 26

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