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.

If the process mean increases very much, the modified control charts are not appropriate.

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

The p-chart is the only chart to monitor the fraction of nonconforming units.

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

A modified control charts limit expression does not contain ___________

A. δ
B. σ
C. μ
D. α
Answer» D. α
Discussion
4.

Who was the first person to develop the acceptance control charts?

A. Astern
B. Roy
C. Freund
D. Crowder
Answer» D. Crowder
Discussion
5.

The approach of using a x chart to monitor the fraction of nonconforming units or the fraction of the units exceeding the specifications, is called the ___________

A. Shewhart control charts
B. Cusum charts
C. EWMA charts
D. Acceptance control charts
Answer» E.
Discussion
6.

When the type I error is specified, the LCL of the modified control chart is ___________

A. \(LCL=LSL-\left(Z_δ-\frac{Z}{\sqrt{n}}\right)\)
B. \(LCL=LSL-\left(Z_δ+\frac{Z}{\sqrt{n}}\right)\)
C. \(LCL=LSL+\left(Z_δ+\frac{Z}{\sqrt{n}}\right)\)
D. \(LCL=LSL+\left(Z_δ-\frac{Z}{\sqrt{n}}\right)\)
Answer» E.
Discussion
7.

From which chart the initial estimate of the process variability is determined?

A. R-chart
B. c-chart
C. p-chart
D. Cusum charts
Answer» B. c-chart
Discussion
8.

If there is a chance of shifting of the process variability, which chart may be used with the modified control chart?

A. c-chart
B. p-chart
C. R-chart
D. x̅ -chart
Answer» D. x̅ -chart
Discussion
9.

If process variability shifts, the modified control charts are ____________

A. Not appropriate
B. Totally appropriate
C. Good to use
D. Perfect for the mapping the shifts
Answer» B. Totally appropriate
Discussion
10.

To design a modified control chart, we must have a good estimate of _________ available.

A. μ
B. σ
C. μ2
D. process variance
Answer» C. μ2
Discussion
11.

Which of the hypothesis can be tested using the modified control charts?

A. μL ≤ μ ≤ μU
B. μL ≤ μ
C. μ ≤ μU
D. μL = μ = μU
Answer» B. μL ≤ μ
Discussion
12.

____________ sigma limits are recommended for modified control charts.

A. 4
B. 2
C. 3
D. 6
Answer» C. 3
Discussion
13.

When the type I error is not specified, the value of LCL of the modified control charts is ____________

A. \(LCL=LSL+\left(Z_δ-\frac{3}{\sqrt{n}}\right) \sigma \)
B. \(LCL=LSL-\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
C. \(LCL=LSL-\left(Z_δ-\frac{3}{\sqrt{n}}\right) \sigma \)
D. \(LCL=LSL+\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
Answer» B. \(LCL=LSL-\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
Discussion
14.

Which of these is a correct expression for the UCL of the modified control charts when the type I error is not specified?

A. \(UCL=USL+\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
B. \(UCL=USL+\left(Z_δ-\frac{3}{\sqrt{n}}\right) \sigma \)
C. \(UCL=USL-\left(Z_δ-\frac{3}{\sqrt{n}}\right) \sigma \)
D. \(UCL=USL-\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
Answer» D. \(UCL=USL-\left(Z_δ+\frac{3}{\sqrt{n}}\right) \sigma \)
Discussion
15.

When the type I error is specified, which of these is correct expression for the UCL of the modified control charts?

A. \(UCL=USL-\left(Z_δ+\frac{Z_α}{\sqrt{n}}\right) \sigma \)
B. \(UCL=USL-\left(Z_δ-\frac{Z_α}{\sqrt{n}}\right) \sigma \)
C. \(UCL=USL+\left(Z_δ+\frac{Z_α}{\sqrt{n}}\right) \sigma \)
D. \(UCL=USL+\left(Z_δ-\frac{Z_α}{\sqrt{n}}\right) \sigma \)
Answer» C. \(UCL=USL+\left(Z_δ+\frac{Z_α}{\sqrt{n}}\right) \sigma \)
Discussion