Question: Q4 (a) Explain FOUR (4) factors associated with reliability. (b) Calculate the reliability of the system connected as shown in Figure 1 below: 0.936 0.9375

Q4 (a) Explain FOUR (4) factors associated with

Q4 (a) Explain FOUR (4) factors associated with reliability. (b) Calculate the reliability of the system connected as shown in Figure 1 below: 0.936 0.9375 0.862 0.915 Figure 1: System diagram 0.936 0.828 (8 marks) 0.727 (5 marks) (c) Failure rate can be estimated from test data by use of calculation. i. ii. Determine the failure rate for a 242-hours test of 12 items where 4 items failed without replacement at 9, 27, 88 and 201 hours. (8 marks) Twenty parts are tested for 200 cycles each. When a part fails, it is replaced by another one. At the end of the test 2 parts had failed. Calculate the failure rate. (4 marks)

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