1- Seven units are tested for 500 hours. Failures are recorded at 285 hours, 370 hours, and 412 hours. The other four units didn't fail. Failed units weren't replaced. Estimate MTTF.
2- The calculation of mean time to repair (MTTR) includes the time needed to
3- Which of the following statements is true about estimating the MTBF using operational data?
4- All of the following are elements of Time to Repair EXCEPT,
5- The primary purpose of a maintenance program is to
6- An RCM program would identify which hazard function for scheduled part replacement?
7- A maintainability prediction is used to assess
8- To model repair times, the ___________________ distribution is commonly used.
9- What is the difference between a system whose reliability prediction is MTTF versus one whose reliability prediction is MTBF?
10- For equal length missions an increase in the MTBF will yield : I. An increase in availability.II. An increase in reliability.III. A decrease in reliability.IV. A decrease in availability
11- The fundamental philosophy of Optimum Parts Replacement is:
12- Preventive maintenance is usually performed in the plant to ensure smooth transformation of raw materials to finished goods. A prime assumption for preventive maintenance action is:
13- The basic maintainability requirements for a system or component is BEST determined via:
14- Specifically, up-time ratio is a measure of:
15- An appropriate preventive maintenance program can greatly increase the overall availability of a system because of:I. An increase in observed reliability.II. An improvement in product or system safety.III. A reduction in spare parts inventory.
16- What is the failure rate of a system composed of three components, each of which can cause a system failure, and which have the following information?
17- For complex electronics systems, the major contributor to repair time is generally:
18- maintainability analysis is most effective when it is performed during which of the following phases?
19- A preventive maintenance program is designed to help reduce or eliminate which of the following problems?
20- The primary purpose of performing preventive maintenance is to
21- The Government-Industry Data Exchange Program (GIDEP) focuses on
22- Maintainability predictions are used to assess
23- The first step in analyzing repairable system data is to
24- Preventive maintenance will decrease the probability of failures when
25- For a system with a constant failure rate, which of the following changes will result in increased availability?
26- Customer needs regarding product reliability become inputs during which product development phase?
27- Which actions describe a type of design for manufacturing (DFM) resulting in faster / easier assembly?
28- The availability requirement is 99% of the time. When the component fails, it takes 40 hours to bring the system back to operating condition. Find the component's MTBF requirement in hours?
29- Corrective action effectiveness is best assessed by
30- Which activity is key to determining the optimum replacement time ?
31- The goal of corrective maintenance is to
32- Which of the following is not an element of active corrective maintence?
33- When preventative maintenance requires spare parts, the number of spares necessary is a function of the
34- Which two factors are impacted the most when there is a waiting time to obtain spares?
35- When an increasing failure probability cannot be detected by the operator, the best strategy to adopt is
36- One advantage of sequential reliability testing is that it
37- Which of the following statements is true about failure data that is reported from the field?
38- Which of the following techniques is used to translate customer expectations into technical specifications?
39- Under the stress-derating technique, which of the following statements is true about how operating stress values compare to the manufacturer 's rating for a part?
40- When new parts are being reviewed for use in a system, a reliability engineer should consider which of the following factors?
41- Which of the following actions will enhance the reliability of a system?
42- The first step in the reliability allocation process should be to
43- A random sample of 10 parts are taken from a production that exhibits a 2% non-conformance rate. Find the probability of finding no defective parts.
44- Which of the following statements is true about the empirical temperature lifetime Arrhenius model,
45- When a non-thermal acceleration stress test is conducted, which of the following models should be used to analyze the test data?
46- The Laplace (centroid) test is useful in analyzing