Q22. An electronic component has been sourced from two different manufactures. Batches of components from each manufacture were tested. To generate results quickly a burn-in process was used. Batch A had a Burn-in acceleration factor of 60 and Batch B of 90. The failures in time were recorded and the data is shown in Table Q6. Batch A 140 Batch B 200 Number working systems at start of test Burn-in Acceleration Factor 60 90 Recorded Failures Recorded Failures Actual Burn-in time (hrs) 3 6 10 15 40 3 6 7 10 20 Actual Burn-in time (hrs) 5 10 15 30 40 6 12 18 37 46 Figure Q6 Reliability Data a) Calculate the effective test time and obtain an expression for the failure rate for the components in Batch A and B. Clearly identify and explain any assumptions you have made. b) Using your answer obtained in a) determine the reliability and MTTF for a typical component from Batch A and Batch B after 6000 hours of use. If you were required to select either components from batch A or B to use in systems, which would you select and why. Q22. An electronic component has been sourced from two different manufactures. Batches of components from each manufacture were tested. To generate results quickly a burn-in process was used. Batch A had a Burn-in acceleration factor of 60 and Batch B of 90. The failures in time were recorded and the data is shown in Table Q6. Batch A 140 Batch B 200 Number working systems at start of test Burn-in Acceleration Factor 60 90 Recorded Failures Recorded Failures Actual Burn-in time (hrs) 3 6 10 15 40 3 6 7 10 20 Actual Burn-in time (hrs) 5 10 15 30 40 6 12 18 37 46 Figure Q6 Reliability Data a) Calculate the effective test time and obtain an expression for the failure rate for the components in Batch A and B. Clearly identify and explain any assumptions you have made. b) Using your answer obtained in a) determine the reliability and MTTF for a typical component from Batch A and Batch B after 6000 hours of use. If you were required to select either components from batch A or B to use in systems, which would you select and why