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A system has three components in parallel with reliabilities 0.9,0.7,and 0.5.What is the system reliability?


A) 0.315
B) 0.700
C) 0.900
D) 0.985
E) 2.100

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Which of the following is a reliability tactic?


A) improving individual components
B) increasing repair speed
C) providing redundancy
D) A and C
E) A,B,and C

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The normal distribution is an appropriate model of:


A) the high initial failure rates of product,machine,or processes.
B) system reliability where components are connected in series.
C) system reliability where components are connected in parallel.
D) the MTBF distribution of products,machines,or processes that have "settled in."
E) the full cost view of maintenance.

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Given the following data,find the expected breakdown cost.The cost per breakdown is $200. Given the following data,find the expected breakdown cost.The cost per breakdown is $200.

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blured image Expected number of breakdowns...

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The MTBF (mean time between failures)is calculated as the reciprocal of the number of failures during a period of time.

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The objective of maintenance and reliability is to:


A) ensure that breakdowns do not affect the quality of the products.
B) ensure that no breakdowns will ever occur.
C) ensure that preventive maintenance costs are kept as low as possible.
D) maintain the capability of the system.
E) ensure that maintenance employees are fully utilized.

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Explain why a small standard deviation of the MTBF distribution makes a product,machine,or process a good candidate for preventive maintenance while a large standard deviation does not.

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A small standard deviation means that th...

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When depot service is compared to operator maintenance:


A) operator maintenance is slower than depot service.
B) competence is higher,but costs may also be higher,with depot service.
C) depot service is often the weak link in the chain because of the lack of specific training.
D) depot service occurs on-site,while operator maintenance occurs off-site.
E) depot service is better for systems connected in parallel,while operator maintenance is preferred for systems connected in series.

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A system has three components in series with reliabilities 0.9,0.7,and 0.5.What is the system reliability?


A) 0.315
B) 0.500
C) 0.700
D) 0.900
E) 2.100

Correct Answer

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________ is the failure rate early in the life of a product or process.

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What is the primary concept of total productive maintenance (TPM)? Identify the four elements that productive maintenance includes.

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TPM's primary concept is reducing variab...

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

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This will increase t...

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

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They "burn in" their products ...

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Sophisticated sensors in a maintenance system can detect:


A) the slightest unusual vibration.
B) low standard deviation in MTBF.
C) low cost to repair options.
D) repairs that carry little nonmonetary consequences.
E) full cost view of maintenance.

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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?

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System reliability must be at least .99 ...

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Simulation models and expert systems are useful tools for improving total productive maintenance.

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Electronic sensors have proven so effective that preventive maintenance is no longer necessary.

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A system has six components in series.Each component has a reliability of 0.99.What is the reliability of the system?

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Why is it that many cases of infant mortality of products are not due to product failure?

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In many cases the failure is not of the ...

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

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Mean time ...

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