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CHAPTER 17: MAINTENANCE AND RELIABILITY TRUE/FALSE 1. Orlando Utilities Commission uses a computerized maintenance management program, and devotes significant dollar and labor resources to power plant maintenance, because the costs of unexpected failure are incredibly high. True (Global company profile, easy) {AACSB: Use of IT} 2. Maintenance includes all activities involved in keeping a system's equipment in working order. True (The strategic importance of maintenance and reliability, easy) 3. Reliability is the probability that a machine part or product will function properly for a specified time regardless of conditions. False (The strategic importance of maintenance and reliability, easy) 4. The product failure rate is the percentage of failures among the total number of products tested. True (Reliability, moderate) 5. The MTBF (mean time between failures) is calculated as the reciprocal of the number of failures during a period of time. True (Reliability, moderate) 6. If the mean time between failures has been calculated to be 2,000 hours, then the number of unit failures per 2,000 hours must be one. False (Reliability, moderate) 7. The reliability of a system in which each individual component must function in order for the entire system to function, and in which each component has its own unique reliability, independent of other components, is the product of the probabilities of each of those components. True (Reliability, moderate) 8. Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure. True (Reliability, moderate) 9. A redundant part or component increases reliability because it is connected in parallel, not in series. True (Reliability, moderate) 10. A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up. False (Reliability, moderate) 11. Preventive maintenance is reactive. False (Maintenance, moderate) 12. Preventive maintenance is nothing more than keeping the equipment and machinery running. False (Maintenance, moderate)
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13. Preventive maintenance implies that we can determine when a system needs service or will need repair. True (Maintenance, moderate) 14. Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product. True (Maintenance, moderate) 15. The failure distributions of products, machines, or processes that have "settled in," or gone beyond the infant mortality phase, often follow the normal distribution. True (Maintenance, easy) 16. Recording the maintenance history of processes, machines, or equipment is important for preventive maintenance, but largely irrelevant for breakdown maintenance. False (Maintenance, easy) 17. The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance, when compared to the "traditional view of maintenance." False (Maintenance, easy) 18. Failures are tolerable as long as their results are not catastrophic.
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