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6 sigma methodologies > CONTROL TEST > Flashcards

CONTROL TEST Flashcards

1
Q

5S audit activities are conducted in the ____________ phase of 5S

A

Sustain

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2
Q

A Belt has collected measurements for a product and has its target value. She wants to monitor the cumulative sum of the differences of each measurement from a target. Select the chart from the following that is appropriate for her needs.

A

CUSUM chart

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3
Q

A Belt has decided to use a control method that can monitor the process output and adjust the input factors without human intervention to sustain process output. This method is known as:

A

A fully automated system.

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4
Q

A Belt needs to monitor the errors in the reports prepared by the quality team each day. The number of reports per day is fixed. What chart should she use?

a.
U chart- varying attribute poisson

b.
P chart-defect- varying units attribute data binomial

c.
C chart-fixed number of defects/constant poisson

d.
I chart-intervals

A

C chart

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5
Q

A Belt studied a control chart and found that all the data points are randomly distributed about the centerline and well within the control limits. What could she conclude wrongly?

a.
Only common cause variation is present in the process.

b.
The process is capable.

c.
The process is in control statistically.

d.
The process is predictable.

A

The process is capable.

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6
Q

A higher sampling rate with smaller subgroups provides process information more frequently.
T/F

A

TRUE

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7
Q

A pizza shop has a system in place to collect the weight data of each pizza prepared. The shop owner wants to know if there is an upward shift or downward shift in the preparation process mean separately. Which chart can be used?

a.
X-bar R chart

b.
One-sided CUSUM chart

c.
EWMA chart (hours, shifts, days, week, month)

d.
Two-sided CUSUM chart

A

One-sided CUSUM chart

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8
Q

primary purpose of a control plan is to:

a.
Control the process outputs.

b.
Make the process owner accountable.

c.
Provide control methods.

d.
Detect if the process ¡s out of control.

A

Make the process owner accountable.

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9
Q

Control charts are generally used to detect if the process has:

a.
Only common-cause variation.

b.
Met customer requirements.

c.
Reached its acceptable level.

d.
Special cause variation.

A

Special cause variation.

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10
Q

Documentation is necessary for institutionalization of improvements, new processes, and standards of Lean Six Sigma projects.

a.
True

b.
False

A

TRUE

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11
Q

For an effective kanban system, the team should maintain which of the following factors?

a.
Consistent cycle times

b.
Standardized kanban bins

c.
Low defect rate in incoming product or service

d.
All of the above

A

All of the above

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12
Q

For an X-bar chart, the centerline is calculated as:

a.
The average of all individual data points.

b.
The average proportion of all subgroups.

c.
The average of ranges of all subgroups.

d.
The average of averages of all subgroups.

A

The average of averages of all subgroups.

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13
Q

In an EWMA formula, the starting value can be a target value if it is provided or is the average of some preliminary data.

a.
True

b.
False

A

TRUE

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14
Q

In Shewhart control charts, the space between the centerline and a control limit is divided into ____ zones to detect out-of-control situations.

a.
three

b.
five

c.
two

d.
six

A

3

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15
Q

In the U chart, upper control limit, UCL = u̅ + 3√ u̅/ni, where u̅ = average number of defects per unit and ni = number of units in subgroup i. What will be the impact on UCL if the subgroup size increases?

a.
The UCL will decrease.

b.
The UCL will also increase.

c.
The UCL has no relation to the subgroup size.

d.
The subgroup size has a direct impact on the UCL.

A

The UCL will decrease.

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16
Q

In which control chart is higher weighting given to the most recent observation and very low weighting to the oldest observations?

a.
CUSUM chart

b.
X-bar chart

c.
EWMA chart

d.
I chart

A

EWMA chart

17
Q

Kaizen is a concept/strategy to achieve rapid improvement.

a.
True

b.
False

A

TRUE

18
Q

Statistical process control (SPC) is not an example of visual management.

a.
True

b.
False

A

FALSE

19
Q

The average number of defective items per subgroup represents the centerline of a(n):

a.
X-bar chart.

b.
NP chart.

c.
P chart.

d.
U chart.

A

NP chart.

20
Q

The average number of samples taken before a single point falls outside the control limits is known as:

a.
Mean length.

b.
Median run length.

c.
Average run length.

d.
Average sample size.

A

Average run length.

21
Q

The process team has collected data on a daily basis for the last two months from all three production lines. Which sampling strategy can you suggest if the team wants to use an X-bar S control chart to detect the process mean shift?

a.
Random subgroups

b.
Rational subgroups

c.
Stratified subgroups

d.
Clusters

A

Rational subgroups

22
Q

The temperature of a warehouse is recorded daily at noon. Which control chart will you suggest be used to monitor the temperature?

A

I chart (used to monitor regular intervals)

23
Q

There is a ____________probability that a data point will be between the control limits of Shewhart control charts with the assumption of normality.

a.
0.954

b.
0.00135

c.
0.9973

d.
0.0027

A

: 0.9973

24
Q

Two Belts plotted the same data using the same chart but concluded differently about the process stability. What is the reason for the difference in conclusion?

a.
One of the Belts plotted data without the time order of the collected data.

b.
One of the Belts did not have the skill to analyze chart.

c.
The data might not be the same.

d.
There is an SPC software issue.

A

One of the Belts plotted data without the time order of the collected data.

25
Q

one hundred items are inspected per day, and the number of defective items is recorded daily. Which control chart is most appropriate to show the number of defective items out of the items inspected each day?

a.
C chart

b.
NP chart

c.
U chart

d.
P chart

A

NP chart

26
Q

What are time-weighted control charts used to detect?

a.
Large shift slowly in the process mean

b.
Small shift slowly in the process mean

c.
Large shift quickly in the process mean

d.
Small shift quickly in the process mean

A

Small shift quickly in the process mean

27
Q

What is not true about a control plan?

a.
It is created by the team.

b.
It is a living document.

c.
It does not include any control methods.

d.
It is a written summary describing systems used for monitoring and controlling process variation.

A

It does not include any control methods.

28
Q

What is not true about statistical process control (SPC) and process capability?

a.
SPC give some idea about the ongoing process capability.

b.
SPC is a capability measurement.

c.
SPC is a visual indication of the continued process capability.

d.
SPC is not a capability measurement.

A

SPC is a capability measurement.

29
Q

What is the most efficient way to ensure critical input variables are under control?

a.
5S

b.
Standardized work

c.
Poka-yoke

d.
TPM

A

Poka-yoke

30
Q

What should not be a consideration for the implementation of an improvement solution from a business decision point of view?

a.
Impact of the improvement solution

b.
Cost to implement the improvement solution

c.
Time to implement the improvement solution

d.
Personal preference

A

Personal preference

31
Q

Which element of the control plan provides guidelines on how to handle out-of-control situations?

a.
Training plan

b.
Monitoring plan

c.
Aligning system and structure

d.
Response plan

A

Response plan

32
Q

Which pair of control charts is most appropriate for analyzing the measurement data in subgroups with outliers?

a.
X-bar R charts

b.
I-MR charts

c.
X-bar S charts

d.
NP and P charts

A

X-bar S charts

33
Q

X-bar, R, and S charts are generally categorized as which of the following?

a.
Variable charts for subgroups

b.
Continuous charts for individual observations

c.
Attribute charts

d.
Discrete charts

A

Variable charts for subgroups

6 sigma methodologies (13 decks)

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