Explore topic-wise MCQs in Statistical Quality Control.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Statistical Quality Control knowledge and support exam preparation. Choose a topic below to get started.

1.

Type I possibility in the phase II application of the Shewhart control charts with warning limits.

A. True
B. False
Answer» B. False
Discussion
2.

Shewhart control charts are better for phase II applications than the Cusum charts.

A. True
B. False
Answer» C.
Discussion
3.

What is the name of the quantity plotted Cion Cusum charts?

A. Cumulative sum from ith sample
B. Cumulative sum to ith sample
C. Cumulative sum to and ith sample
D. Cumulative sum from and ith sample
Answer» D. Cumulative sum from and ith sample
Discussion
4.

What is the value of the quantity plotter on the Cusum charts?

A. \(C_i=\sum_{j=1}^i (\bar{x}_j-μ)\)
B. \(C_i=\sum_{j=1}^i (\bar{x}_j+2μ)\)
C. \(C_i=\sum_{j=1}^i (\bar{x}_j-2μ)\)
D. \(C_i=\sum_{j=1}^i (\bar{x}_j+μ)\)
Answer» B. \(C_i=\sum_{j=1}^i (\bar{x}_j+2μ)\)
Discussion
5.

In which phase of SPC are the Cusum control charts are used?

A. Phase I
B. Phase II
C. Both, phase I and II
D. Neither in phase I nor in phase II
Answer» C. Both, phase I and II
Discussion
6.

What is the full form of the Cusum control charts?

A. Curetted sum control charts
B. Corrected sum control charts
C. Compressive sum control charts
D. Cumulative sum control charts
Answer» E.
Discussion
7.

Which of the error types are likely to occur when the warning limits are used with Shewhart control charts the phase II of SPC?

A. Type I
B. Type II
C. Type I and Type II
D. Type III
Answer» B. Type II
Discussion
8.

What is the effect of warning limits and other sensitizing rules over the average run length of the process?

A. Increase
B. Decrease
C. Remains same
D. Does not change the ARL
Answer» B. Decrease
Discussion
9.

Which of these can be applied to Shewhart control charts to enhance their performance in the phase II application of the SPC?

A. Control limits
B. Mean of the process
C. Standard deviation of the process
D. Warning limits
Answer» E.
Discussion
10.

Which of these is a reason why the Shewhart control charts are not used in phase II application of SPC?

A. Because they can count larger shifts in process
B. Because they can analyze information about the last sample observation
C. Because they become insensitive to lower order process shifts
D. Because they are impractical
Answer» D. Because they are impractical
Discussion
11.

Shewhart control charts are insensitive to ________ process shifts.

A. Small (<1.5σ)
B. Medium (1.5 σ<shift<3 σ)
C. Big (>6 σ)
D. Very Big
Answer» B. Medium (1.5 σ<shift<3 σ)
Discussion
12.

Which of these is a disadvantage of Shewhart control charts?

A. Can be for both attributes and variables
B. Gives process information
C. Using only the information about the last sample observations
D. Uses every information about the process
Answer» D. Uses every information about the process
Discussion
13.

Which of these is not one of the phenomenons likely to occur while the phase I application of SPC?

A. Process likely to be out of control
B. Process changing its state continuously between in-control and out-of-control
C. Experiencing assignable causes
D. Large shifts in the monitored parameters
Answer» C. Experiencing assignable causes
Discussion
14.

Which of the control charts are used in phase I application of SPC?

A. Shewhart control charts
B. Cusum control charts
C. Both, Shewhart control charts and Cusum control charts
D. Neither one of the Shewhart control charts or the Cusum control charts
Answer» B. Cusum control charts
Discussion
15.

Cusum control charts were originated in ____________

A. 1950s
B. 1960s
C. 1920s
D. 1980s
Answer» B. 1960s
Discussion