O.M. Ch. 16-MC

Question 1

Quality at the source means the ultimate quality of a finished good cannot be any better than the quality of the raw material used.

Answer 1

False

Question 2

The 1:10:100 Rule states that the value of a good increases exponentially as it progresses from supplier to manufacturer to customer.

Answer 2

False

Question 3

If supplier documentation is done properly, incoming inspection can be completely eliminated.

Answer 3

True

Question 4

In-process control is typically performed by the people who run the processes on the front line.

Answer 4

True

Question 5

If no common causes affect the output of a process, we say that the process is in control.

Answer 5

False

Question 6

Special cause variation is the result of complex interactions of variation in materials, tools, machines, information, workers, and the environment.

Answer 6

False

Question 7

Over-adjusting a process that is in control will increase the variation in the output.

Answer 7

True

Question 8

Keeping common cause variation from occurring is the essence of statistical quality control.

Answer 8

False

Question 9

A discrete metric is one that is calculated from data that are counted.

Answer 9

True

Question 10

All control charts are similar in structure, but the specific formulas used to compute control limits for them differ.

Answer 10

True

Question 11

The sample range control chart is always analyzed before the sample mean control chart.

Answer 11

True

Question 12

R-charts and charts are used with discrete data.

Answer 12

False

Question 13

Whenever an unusual pattern in a control chart is identified, the process should be stopped until the problem has been identified and corrected.

Answer 13

True

Question 14

A point below the lower control limit on a p-chart might be good news.

Answer 14

True

Question 15

A c-chart monitors the number of conforming items.

Answer 15

False

Question 16

A c-chart requires that the size of the sampling unit or number of opportunities for errors is constant.

Answer 16

True

Question 17

Two key decisions in developing a sampling plan for SPC purposes are sample size and sampling frequency.

Answer 17

True

Question 18

No hard-and-fast rules or formulas exist for computing the optimal frequency of sampling.

Answer 18

True

Question 19

SPC is more useful for processes that operate at a high sigma level than a low sigma level.

Answer 19

False

Question 20

A process might be off-center and still show an acceptable value of Cp.

Answer 20

True

Question 21

Process capability is important to both product designers and process owners.

Answer 21

True

Question 22

The three stages in manufacturing at which quality control is generally applied include all of the following except

Answer 22

at shipping to customers

Question 23

Which of the following is not correct regarding special cause variation?

Answer 23

it cannot be controlled

Question 24

The two basic types of metrics monitored by control charts are

Answer 24

discrete and continuous

Question 25

Control limits for a control chart should be established when

Answer 25

only common-cause variation is present

Question 26

Which of the following control chart occurrences is not an indication the process is out of control?

Answer 26

majority of points are near the center line

Question 27

A p-chart monitors the

Answer 27

proportion of nonconforming

Question 28

A c-chart monitors the

Answer 28

number of non-conformances per unit

Question 29

When using a conventional p-chart for a process with a high sigma level, all of the following are correct except

Answer 29

a. the chart will provide little information for control?

Question 30

For a non-centered process, which of the following must be true for the process to be declared capable?

Answer 30

Cpl > 1 and Cpu > 1