Reference no: EM132855529

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"Time-Weighted - Cumulative Sum Control Chart - 1".

1. Cusum control charts were originated in ____________

a) 1950s

b) 1960s

c) 1920s

d) 1980s

2. 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

3. 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

4. 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

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5. 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

6. 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

7. 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

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

9. 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.

10. 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