Exam 6: Quality and Process Improvement

The additional time incurred if an item is rerouted to some previous operation(s)to correct a defect would be categorized as an internal failure cost of quality.

Quality engineering is an approach that involves combining engineering and statistical methods to reduce costs and improve quality by optimizing product design and manufacturing processes.

Table 6.1 Factors for Calculating Three-Sigma Limits for the $\bar { X }$ -chart and R-chart Size of Sample (n) Factor for UCL and LCL for X - Charts Factor for LCL for R - Charts Factor for UCL for R - Charts 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 0 2.282 5 0.577 0 2.115 6 0.483 0 2.004 7 0.419 0.076 1.924 8 0.373 0.136 1.864 9 0.397 0.184 1.816 10 0.308 0.233 1.777 Source: 1950 Manual on Quality Control of Materials, copyright American Society for Testing Materials. Reprinted with permission. -A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.0015 inch.Currently,the first three items from each batch of 20 are inspected.Use Table 6.1.What is the value of LCL $\bar { X }$ if the sample size is increased to 6?

A product has three components with individual reliabilities of 0.85,0.92,and 0.95.What is the reliability of the product?

A manufacturer of silk inspects each bolt of material at the end of the manufacturing process.When the process is in control,it averages 11 defects per bolt.If a 2-sigma control limit is used,what is the upper control limit?

Which one of the following is part of prevention costs?

Which one of the following statements about TQM is FALSE?

A company is interested in monitoring the variability in the weight of the fertilizer bags it produces.An appropriate control chart would be

The implementation of a total quality management program will most likely result in a(n)

The defect rate for a product has historically been about 2.0%.What are the upper and lower control chart limits if you wish to use a sample size of 100 and 3 sigma limits?

Process capability determines whether a process is capable of producing the product or services that customers demand.

Whose teachings regarding quality management emphasized the role of project teams to achieve periodic "breakthrough" improvements that provide dramatic gains to address chronic quality problems?

Continuous improvement is a philosophy that

Which one of the following is a consequence of internal failures?

The central line on a p-chart is 0.50 with an UCL of 0.65 and a LCL of 0.35.The results of the next six samples are 0.60,0.37,0.45,0.48,0.53,and 0.62.What should you do?

Discuss the situations under which each of the following charts would be best: X-chart,p-chart,and c-chart.

Historically,the average proportion of defective bars has been 0.015.Samples will be of 100 bars each.Construct a p-chart using z = 3.Suppose a sample had 0.07 defective.What would you do?

A product is composed of four subsystems that have reliabilities of .999,.87,.98,and .99.What is the overall reliability of this product?

Table 6.1 Factors for Calculating Three-Sigma Limits for the $\bar { X }$ -chart and R-chart Size of Sample (n) Factor for UCL and LCL for X - Charts Factor for LCL for R - Charts Factor for UCL for R - Charts 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 0 2.282 5 0.577 0 2.115 6 0.483 0 2.004 7 0.419 0.076 1.924 8 0.373 0.136 1.864 9 0.397 0.184 1.816 10 0.308 0.233 1.777 Source: 1950 Manual on Quality Control of Materials, copyright American Society for Testing Materials. Reprinted with permission. -A milling operation has historically produced an average thickness of 0.005 inch with an average range of 0.015 inch.Currently,the first three items from each batch of 20 are inspected.Use Table 6.1.What is the value of the LCL $\bar { X }$ ?

Customers assess quality solely on the basis of how goods and services conform to design specifications and associated operating characteristics.