Exam 17: Maintenance and Reliability Decisions

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 ________.

Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.

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?

How do many electronic firms deal with infant mortality in their products?

What is the impact on system reliability of adding parts or components in parallel?

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"?

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:

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

If the mean time between failures has been calculated to be 2,000 hours,then FR(N)= 0.0005 failures/unit-hour.

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

Small standard deviations in the MTBF distribution of a machine tend to support a policy of breakdown maintenance for that machine.

The objective of maintenance and reliability is to maintain the capability of the system.

A product has four components A,B,C,and D.The finished product must have a reliability of at least .95.The first three components come from a supplier,and they have reliabilities of .99,.98,and .995,respectively.The fourth component is being designed now.What must the reliability of component D be in order to meet the product reliability condition?

________ is the expected time between a repair and the next failure of a component,machine,process,or product.

As far as maintenance costs are concerned:

Maintenance includes all activities involved in keeping a system's equipment in working order.

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

Which one of the following statements about maintenance is TRUE?

Increasing the number of parts or components in a product tends to reduce its reliability.Why is this true only when adding components in series?

When depot service is compared to operator maintenance: