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 an assignable cause is expected in the process, the subgroups taken subsequently should have a maximum difference.

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

14 points in a row alternating up and down the mean will not indicate action needed for any process for which a control chart is plotted.

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

Which of these is not one of the sensitizing Western Electric rules that indicate action needed for Shewhart control charts?

A. One or more points near a warning limit/control limit
B. One point plots outside 3-sigma control limits
C. Eight consecutive points plot on one side of the control line
D. Two of 3 consecutive points plot beyond the 2-sigma warning limits
Answer» B. One point plots outside 3-sigma control limits
Discussion
4.

If the ARL is 34.8 for a process which has ATS=69.6 hrs, what is the time interval before taking samples?

A. 0.5 hrs
B. 8 hrs
C. 2 hrs
D. 4 hrs
Answer» D. 4 hrs
Discussion
5.

Which of these statements, correctly describes the concept of rational subgroups?

A. If assignable causes are present, the chances of difference between subgroups should be largest
B. If assignable causes are present, the chances of difference between subgroups must be lowest
C. If assignable causes are present, the chances of difference between the subgroups must be moderate
D. If assignable causes are present, the chances of difference between the subgroups must be zero
Answer» B. If assignable causes are present, the chances of difference between subgroups must be lowest
Discussion
6.

Decreasing sample size will ________

A. Decrease the slope of OC curve
B. Increase the slope of OC curve
C. First decrease then increase the slope of OC curve
D. Makes OC curve have 0 slope
Answer» C. First decrease then increase the slope of OC curve
Discussion
7.

If for a process, the samples are taken 5 hrs apart and its ARL is 24.24, What will be ATS for it?

A. 121.2
B. 110.0
C. 113.3
D. 137.8
Answer» B. 110.0
Discussion
8.

What is the full-form of ATS?

A. Average time to Stop
B. Average Time to Start
C. Average Time to Signal
D. Average Time to Select
Answer» D. Average Time to Select
Discussion
9.

For an average run length of 370, what will be the probability of a point falling out of the area between the control limits?

A. 0.0027
B. 0.0013
C. 0.0045
D. 0.0040
Answer» B. 0.0013
Discussion
10.

The probability of a point to exceed the control limits for a control chart is 0.0040. What will be the ARL for this case?

A. 250
B. 278
C. 210
D. 216
Answer» B. 278
Discussion
11.

ARL is termed as ____________

A. Average Run Length
B. Allocating Run Length
C. Affected Run Length
D. Assumed Run Length
Answer» B. Allocating Run Length
Discussion
12.

The inner limits in the Two sets of limits approach of the construction of control chart are called _____

A. Action Limits
B. Variable Limits
C. Constant Limits
D. Warning Limits
Answer» E.
Discussion
13.

If two sets of limits approach is taken to construct a control chart, what are the outer set of limits called?

A. Action Limits
B. Warning Limits
C. Variable Limits
D. Constant Limits
Answer» B. Warning Limits
Discussion
14.

If we decrease the distance between LCL and UCL, what will happen?

A. Decreasing the possibility of type I error
B. Increasing the possibility of type II error
C. Increasing the possibility of type I error
D. Decreasing the possibility of type II error
Answer» E.
Discussion
15.

Moving the UCL and LCL line far from the Center line means ____

A. Decreasing the possibility of type I error
B. Increasing the possibility of type II error
C. Increasing the possibility of type I error
D. Decreasing the possibility of type II error
Answer» B. Increasing the possibility of type II error
Discussion