Exam 17: Maintenance and Reliability

General Grant must send orders to General Butler.Carrier pigeons are the medium of choice.A single pigeon has a .7 probability of arriving at the proper destination in a timely fashion.How many pigeons,each carrying an identical set of orders,must Grant send in order for him to have 98% confidence that the orders reached General Butler?

________ combines total quality management with a strategic view of maintenance from process equipment design to preventive maintenance.

Ten high-intensity bulbs are tested for 100 hours each.One failed at 10 hours;all others completed the test.Calculate FR(%),FR(N)and MTBF.

Which of the following statements about maintenance at the Orlando Utilities Commission is FALSE?

When identifying the optimal maintenance policy,the cost of inventory maintained to compensate for the downtime is a cost often ignored.

Which one of the following statements about maintenance is TRUE?

A system is composed of three components A,B,and C.All three must function for the system to function.There are currently no backups in place.The system has a reliability of 0.966.If a backup is installed for component A,the new system reliability will be:

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours;all others completed the test.Calculate FR(%)and FR(N).

Explain carefully how redundancy improves product reliability.

Suppose that a three-stage process in a nuclear reactor had reliability ratings of .98 at each station and that only one stage needed to be successful for the process to work.If the plant wants to establish 6-sigma standards (≤ 3.4 defects per million),what % reliable redundant controls need to be added to each station.

The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance,when compared to the "traditional view of maintenance."

Preventive maintenance is reactive.

What is the reliability of the three components connected in series shown below?

Which of the following is true regarding total productive maintenance (TPM)?

A product is composed of a series connection of four components with the following reliabilities.What is the reliability of the system?

Autonomous maintenance occurs when:

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?

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.

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours;another failed at 70 hours;all others completed the test.Calculate FR(%),FR(N),and MTBF.

Tiger Island Fabricators,which builds offshore oil platforms,has been experiencing problems with its profiling machine,a computer-driven device that cuts the ends of pipe so that it can be welded to another pipe,as shown in the data below. Each time a machine breaks down,the company loses about $3,000.If the company implements preventive maintenance,it will be able to reduce the number of breakdowns to one per month.Preventive maintenance costs would be $500 a month.Is preventive maintenance a cost-effective option?