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.

The EWMA charts are recommended for phase II applications as it is totally a nonparametric procedure.

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

The signal resistance value depends on the value chosen for .

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

In the case of Shewhart charts, if the data is not according to the normal distribution, the actual in-control ARL (ARL0) will be ____________ the expected value.

A. Considerably higher than
B. Considerably lower than
C. Equal to
D. Almost equal to
Answer» C. Equal to
Discussion
4.

Which of these is not an advantage of low value of in the case of EWMA charts?

A. Good ARL performance
B. Insensitivity to the normality of the data
C. Good ability to detect the larger process shifts
D. Easy detection of small process shifts
Answer» E.
Discussion
5.

Which of these is not an advantage of using a Shewhart control chart with the EWMA chart?

A. Detection of larger process shifts
B. ARL adjustment
C. Counteraction to the high signal resistance value
D. No defects
Answer» E.
Discussion
6.

Who were the first persons to recommend the use of Shewhart control charts with the EWMA charts with low values of ?

A. Woodall and Mahmoud
B. Woodall and Roberts
C. Roberts and Mahmoud
D. Roberts and Crowder
Answer» B. Woodall and Roberts
Discussion
7.

Which of these methods can be used to counteract the signal resistance in case of small values of with EWMA charts?

A. To use a cusum chart paralleled
B. To use a Shewhart control chart paralleled
C. To just wait for EWMA chart to be plotted till 50 observations
D. To increase the value of process mean target
Answer» C. To just wait for EWMA chart to be plotted till 50 observations
Discussion
8.

Small values of gives ______ values of the SR (EWMA).

A. Larger
B. Lower
C. Equal
D. Both, larger and smaller
Answer» B. Lower
Discussion
9.

Which of these is the maximum value of the SR averaged over all values of EWMA statistic?

A. (SR_{max} (EWMA)=L frac{(2- )}{ } )
B. (SR_{max}(EWMA)=L sqrt{ frac{(2- )}{ }} )
C. (SR_{max} (EWMA)=L+ sqrt{ frac{(2- )}{ }} )
D. (SR_{max} (EWMA)=L- sqrt{ frac{(2- )}{ }} )
Answer» C. (SR_{max} (EWMA)=L+ sqrt{ frac{(2- )}{ }} )
Discussion
10.

What is the value of the term w called in the SR value of a EWMA chart?

A. First EWMA value
B. Last EWMA value
C. Value of EWMA statistic
D. Weight average
Answer» D. Weight average
Discussion
11.

What is the value of SR for an EWMA chart?

A. SR(EWMA)= ( frac{L sqrt{ frac{ }{2- }}+( -1)w}{ } )
B. SR(EWMA)= ( frac{L sqrt{ frac{ }{2- }}-(1- )w}{ } )
C. SR(EWMA)= ( frac{L sqrt{ frac{ }{2- }}-( -1)w}{ } )
D. SR(EWMA)= ( frac{L sqrt{ frac{ }{2- }}+(1- )w}{ } )
Answer» C. SR(EWMA)= ( frac{L sqrt{ frac{ }{2- }}-( -1)w}{ } )
Discussion
12.

Which of these is not having a constant SR value?

A. c-chart
B. R-chart
C. p-chart
D. EWMA chart
Answer» E.
Discussion
13.

Which of these is a having a constant SR?

A. A chart
B. A Cusum chart
C. An EWMA chart
D. Every control chart
Answer» B. A Cusum chart
Discussion
14.

For a Shewhart control chart, what is the value of SR?

A. Z<sub> /2</sub>
B. 2
C. L
D. 2L
Answer» D. 2L
Discussion
15.

The largest standard deviation of the sample mean from the target, not leading to an immediate out-of-control signal, is called _______________ of a control chart.

A. ARL
B. UCL
C. Signal resolution
D. Signal resistance
Answer» E.
Discussion