Question

PC Boards Inc. (PCBI) is a manufacturer of printed circuit boards. As of Jan 1st this year, Acme Resistors Ltd. became a new supplier of resistors required in the manufacturing of PCBI's Circuit Board #207. This circuit board is a popular product purchased by manufacturers of hospital bed control systems. The switch to Acme's resistors is due to the demand of PCBI's customers for better performing and cheaper printed circuit products, which in turn led to the redesign of PCBI's Circuit Board #207. At the request of Fred Downing, a PCBI Reliability Engineer responsible for Circuit Board # 207, QC conducted tests on incoming resistors to determine what percent are good versus bad. The findings of the tests are that 1% are bad when purchased (a) What is the probability that Circuit Board # 207 with 10 resistors has exactly 1 bad resistor? (2 marks) (b) Suppose QC tests imply that hospitals who buy beds manufactured with the new Circuit Board #207 may experience a drop in reliability. A technical bulletin warning of this risk is therefore issued by hospital bed manufacturers to all hospitals that have purchased beds with Circuit Board #207 built after Jan 1st. You are the Reliability Engineer responsible for hospital beds at a large hospital in Toronto. What steps should you take when you receive the technical bulletin? What factors must you consider? (3.5 marks) (c) How would you evaluate over the next few years whether your actions were too excessive or not adequate enough? Provide an example of adjustments you might make as a result. (1.5 marks)

Answer 1

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