Question 1

Statistical process control is a tool used to monitor and improve quality.

Accepted Answer

A) True 
 B)False

Question 2

The smaller the historical proportion defective reported for a process,the larger the sample size required to detect special cause variation with a p-chart.

Accepted Answer

A) True 
 B)False

Question 3

The formula used to determine the upper and lower control limits is based on specification limits.

Accepted Answer

A) True 
 B)False

Question 4

A company manufactures a product that has a design (nominal)target width of 5 inches with tolerances of + .05 inch.The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch.The process capability ratio for this process is

Accepted Answer

A) -1.67. 
B) -1.5. 
C) 1.5. 
D) 1.67. 
A) -1.67. 
B) -1.5. 
C) 1.5. 
D) 1.67.

Question 5

With a c-chart,the sample size is small and often contains only one item.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following control charts are based on sample sizes as small as one?

Accepted Answer

A)    
B) R 
C) c 
D) p 
A)    
B) R 
C) c 
D) p

Question 7

Information from an R-chart can be used to construct the control limits for an   -chart.

Accepted Answer

A) True 
 B)False

Question 8

Variable control charts are used for quantitative measures such as weight or time.

Accepted Answer

A) True 
 B)False

Question 9

Possible root causes of special cause variation include all of the following except

Accepted Answer

A) operator error. 
B) process out of adjustments. 
C) over producing. 
D) defective materials. 
A) operator error. 
B) process out of adjustments. 
C) over producing. 
D) defective materials.

Question 10

If the quality of a process's output is determined by the difference between the largest and smallest values in a sample,use a(n)___ control chart.

Accepted Answer

A)    
B) R 
C) c 
D) p 
A)    
B) R 
C) c 
D) p

Question 11

Process control charts are often used at a critical point after which it is difficult to correct or rework the process output.

Accepted Answer

A) True 
 B)False

Question 12

In general,a process is considered to be in control for all the following conditions except

Accepted Answer

A) no points are outside the control limits. 
B) all points are above the centre line. 
C) the points are randomly distributed following a normal population. 
D) no pattern exists in the plotted points (no evidence of a run). 
A) no points are outside the control limits. 
B) all points are above the centre line. 
C) the points are randomly distributed following a normal population. 
D) no pattern exists in the plotted points (no evidence of a run).

Question 13

A process capability ratio reflects the number of (Z)sigmas included in the range between the upper and lower control limits.

Accepted Answer

A) True 
 B)False

Question 14

When special cause variation is detected,it is normally eliminated by increasing the number of standard deviations (z value)used to calculate the control limits.

Accepted Answer

A) True 
 B)False

Question 15

Special cause variation can be identified using statistical process control.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following statements concerning control chart limits is true?

Accepted Answer

A) The smaller the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process. 
B) The larger the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process. 
C) The smaller the value of z,the wider the control limits are and the less sensitive the chart is to changes in the production process. 
D) The larger the value of z,the more narrow the control limits are and the less sensitive the chart is to changes in the production process. 
A) The smaller the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process. 
B) The larger the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process. 
C) The smaller the value of z,the wider the control limits are and the less sensitive the chart is to changes in the production process. 
D) The larger the value of z,the more narrow the control limits are and the less sensitive the chart is to changes in the production process.

Question 17

Control limits are based on the special cause variation inherent in a process.

Accepted Answer

A) True 
 B)False

Question 18

Defect and defective mean the same thing for attribute (qualitative)control charts.

Accepted Answer

A) True 
 B)False

Question 19

What is a c-chart and when is it used?

Accepted Answer

A c-chart is a type of attribute control

Question 20

The process centre line for both   and R-charts are both the same value because they are based on the same raw data.

Accepted Answer

A) True 
 B)False

Exam 3: Statistical Process Control

Statistical process control is a tool used to monitor and improve quality.

The smaller the historical proportion defective reported for a process,the larger the sample size required to detect special cause variation with a p-chart.

The formula used to determine the upper and lower control limits is based on specification limits.

A company manufactures a product that has a design (nominal)target width of 5 inches with tolerances of + .05 inch.The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch.The process capability ratio for this process is

With a c-chart,the sample size is small and often contains only one item.

Which of the following control charts are based on sample sizes as small as one?

Information from an R-chart can be used to construct the control limits for an -chart.

Variable control charts are used for quantitative measures such as weight or time.

Possible root causes of special cause variation include all of the following except

If the quality of a process's output is determined by the difference between the largest and smallest values in a sample,use a(n)___ control chart.

Process control charts are often used at a critical point after which it is difficult to correct or rework the process output.

In general,a process is considered to be in control for all the following conditions except

A process capability ratio reflects the number of (Z)sigmas included in the range between the upper and lower control limits.

When special cause variation is detected,it is normally eliminated by increasing the number of standard deviations (z value)used to calculate the control limits.

Special cause variation can be identified using statistical process control.

Which of the following statements concerning control chart limits is true?

Control limits are based on the special cause variation inherent in a process.

Defect and defective mean the same thing for attribute (qualitative)control charts.

What is a c-chart and when is it used?

The process centre line for both and R-charts are both the same value because they are based on the same raw data.

Operations Management

Quality Management

Operational Decision-Making Tools: Acceptance Sampling

Product Design

Service Design

Processes and Technology

Capacity and Facilities Design

Operational Decision-Making Tools: Facility Location Models

Human Resources

Operational Decision-Making Tools: Work Measurement

Project Management

Supply Chain Management: Strategy and Design

Global Supply Chain Procurement and Distribution

Forecasting

Inventory Management

Operational Decision-Making Tools: Simulation

The Sales and Operations Planning Process

Operational Decision-Making Tools: Linear Programming

Resource Planning

Lean Systems

Scheduling

Filters