Control Charting MCQs : This section focuses on the "Control Charting" in Statistical Quality Control. These Multiple Choice Questions (MCQs) should be practiced to improve the Statistical Quality Control skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Control charts, also known as ?
A. Shewhart charts
B. Process behavior charts
C. Both A and B
D. None of the above
Explanation: Control charts, also known as Shewhart charts or process-behavior charts, are a statistical process control tool used to determine if a manufacturing or business process is in a state of control.
The control chart was invented by Walter A. Shewhart working for Bell Labs in the?
Explanation: The control chart was invented by Walter A. Shewhart working for Bell Labs in the 1920s.
Does charts features Annotation with events of interest?
C. Can be yes or no
D. Can not say
Explanation: Yes, charts features Annotation with events of interest.
Which of these is used as a technique for process control for short production runs?
A. Using the variable value to plot the control chart
B. Using deviation from nominal to plot the control chart
C. Using the variable change to plot the control chart
D. Using the variable decrease or increase to plot the chart
Explanation: The short production runs are having very wide applications in modern industries. The statistical process control technique used for the short production runs is generally measuring deviation from nominal value to plot the control chart, instead of the variable control chart.
A control chart consists of:
A. Points representing a statistic
B. Upper and lower control limits
C. standard deviation
D. All of the above
Explanation: A control chart consists of all of the above features.
What is the UCL of the standardized R chart for short production runs?
Explanation: The standardized R chart is the best way to study the short production run data when the part standard deviations are not same. This chart has UCL value of D4.
The center line of the np-chart is at _______
Explanation: The control chart, which plots the number of nonconforming samples, is called np-chart. This charts when standardized, have their center line at the zero.
Which of these is not a purpose for which control charts are produced for?
A. Control of the process
B. Reduction of variability
C. Increment of variability
D. Continuous process improvement
Explanation: The control charts are generally plotted for the main reasons like control of the process or statistical monitoring, reduction of variability, and continuous process improvement.
Which of these is true for DNOM approach?
A. The sample size is variable
B. The process standard deviation is different for all parts
C. The sample size remains same for all parts
D. The sample size varies from one part to another
Explanation: It is desirable that, the sample sizes, which are used to find out the observations data, should be constant, when the DNOM approach is to be used for the control charting.
Shewhart set 3-sigma (3-standard deviation) limits.
C. Can be true or false
D. Can not say
Explanation: True, Shewhart set 3-sigma (3-standard deviation) limits