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Operations Management 101 Practice Test: Maintenance and Reliability Decisions
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Maintenance and reliability are important aspects of operations management. Reliability is the likelihood that a machine or system will function properly. Maintenance management can improve the reliability and operational performance of manufacturing and facilities equipment.  Here are some maintenance and reliability decisions: Preventive maintenance: A critical component of reliability and operational excellence. Predictive maintenance: Focuses on maintaining equipment based on its known condition. Maintenance strategy: A decision process that ensures the most effective maintenance... Show more
Operations Management 101 Practice Test: Maintenance and Reliability Decisions
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25 Questions

1. A two-component process has an 81% success rate in series and a 99% success rate in parallel. If each component has the same reliability, what is the reliability of an individual component?
2. Simulation models and expert systems are useful tools for improving total productive maintenance.
3. The normal distribution is an appropriate model of:
4. Which of the following is a reliability tactic?
5. Infant mortality refers to which one of the following examples?
6. Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.
7. Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; all others completed the test. FR(%) is ________ and MTBF is ________.
8. Ten high-technology batteries are tested for 200 hours each. One failed at 50 hours; all others completed the test. FR(%) is ________ and FR(N) is ________.
9. The objective of maintenance and reliability is to maintain the capability of the system.
10. Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; another failed at 140 hours; all others completed the test. FR(%) is ________ and MTBF is ________.
11. The MTBF distributions of products, machines, or processes that have 'settled in,' or gone beyond the infant mortality phase, often follow the normal distribution.
12. A job consists of a series of three tasks. Task 1 is performed correctly 98% of the time, task 2 is performed correctly 99% of the time, and task 3 is performed correctly 97% of the time. What is the reliability of this job?
13. The objective of maintenance and reliability is to:
14. As the number of components in a system connected in a series decreases, all other things being equal, the reliability of the system usually:
15. Preventive maintenance implies that we can determine when a system needs service or will need repair.
16. Which of the following increases as repairs move from the maintenance department to the depot service?
17. A system is composed of four parts, J, K, L, and M. All four must function for the system to function. The four component reliabilities are .99, .98, .992, and .998. The designers are considering putting an 80% reliable backup at K. This backup will change the system reliability from ________ to ________.
18. The product failure rate FR(%) is the percent of failures among the total number of products tested.
19. Which one of the following statements about maintenance is TRUE?
20. Small standard deviations in the MTBF distribution of a machine tend to support a policy of breakdown maintenance for that machine.
21. Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.
22. Reliability is the probability that a machine part or product will function properly for a specified time regardless of conditions.
23. While breakdowns occur randomly, their frequency is somewhat predictable through such tools as the product failure rate, MTBF, and the breakdown costs model.
24. Maintenance includes all activities involved in keeping a system's equipment in working order.
25. Consider a product with three components in series, with reliabilities of 0.90, 0.80, and 0.99 for components A, B, and C, respectively. Furthermore, component B uses a backup that also has a reliability of 0.80. What is the reliability of the system?

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