Exam 18: Maintenance and Reliability

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 ________.

An oil change is to ________ maintenance as repair of a broken alternator is to ________ maintenance.

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?

The inverse of the mean time between failures is the ________.

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

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 ________.

A system has four components in a series.What is the reliability of the system?

A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

The ________ takes into account such costs as deteriorated customer relations and lost sales.

Define reliability.

A simple electrical motor has three components: windings,armature,and housing.These three components have reliabilities of .9998,.9992,and .9999.There is no possibility of redundant parts.What is the reliability of the motor? Round your answer to four decimal places.

Given the following data,find the expected breakdown cost.The cost per breakdown is $100.

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

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?

Which one of the following statements about maintenance is TRUE?

The diagram below identifies the elements of service as provided by a soft drink vending machine.Each element has an estimate of its own reliability,independent of the others.What is the reliability of the "system"?

What is the probability that a product will function properly for a specified time under stated conditions?

While breakdowns occur randomly,their frequency is somewhat predictable through such tools as the product failure rate,MTBF,and the breakdown costs model.

Preventive maintenance is nothing more than keeping the equipment and machinery running.

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.