Lean Six Sigma Black Belt Sample Paper 2: Control 1. Control charts help us in all the following, EXCEPT: Understand and quantify process variation Determine when to deem variation as random vs actionable Identify cause of non-conformities Monitor a process in relatively real time2. A control plan should have Action plan to out of control conditions Appropriate sample sizes and frequency of all testing Risk mitigation plans to ensure X’s stay in control All the above3. A control chart that does not have any out-of-control condition is considered___________, and the process is operating in a state of __________. a. stable, statistical control b. stable, no non-conformance c. capable, equilibrium d. capable, statistical control4. The project closure and benefit realization needs to be signed off by: Project Sponsor Process Owner Financial Analyst All the above5. With respect to control charts, one of the following is not correctly matched Y-axis: Value of the characteristic under consideration Centerline: Represent process average Control limits: Placed at Process average ± Standard deviation X-axis: Time order in which subgroup data was collected 6. What is plotted in case of p-chart Number of defectives Percentage of defectives Proportion of defectives Probability of defectives (P-value)7. Which of the following is not a question in the Control phase tollgate review? Has the Financial Benefit Summary been completed? Has the Resource Manager reviewed it? Has the necessary training for process owners/operators been performed? Have “lessons learned” been captured? Has the scope of the project been finalized?8. Control limits of which charts often appear ragged? np-chart, p-chart, c-chart c-chart, u-chart np-chart, c-chart p-chart, u-chart9. In which of the following charts will the Lower control limit (LCL) not be artificially set to zero, if the calculation of LCL gives a negative value R chart S chart X-bar chart np-chart10. Which of following is a “living” document Control plan Work Instructions Process FMEA All the above11. One of following is an example of Poka yoke with high mistake proofing power? Shape of the SIM card ensuring the card fits only in one orientation Cellphone alerting the user if battery goes below 20% Fire warning to evacuate the building Notification before sending the email asking “There is no title. Send anyway?”12. What is plotted in U-chart Defects per unit with respect to time Unusual observations with respect to time Uniformity with respect to time Count of Defects with respect to time13. For variable control charts: If the variation chart is out of control, then the control limits on the mean chart will be inaccurate and may falsely indicate an out-of-control condition When the variation chart is in control, you can be sure that an out-of-control mean chart is due to changes in the process center. Chart showing measure of dispersion should be reviewed first. All the above14. In Poka Yoke_______________ Human errors are avoided Errors occur, but do not result into a defect Defects occur, but do not move to the next step All the above15. The correct sequence of activities in a reaction plan is: Containment> Diagnosis> Verification >Disposition Containment> Verification> Diagnosis >Disposition Containment> Disposition> Diagnosis >Verification Containment> Verification> Disposition> Diagnosis16. For a process in control, the theoretical probability that a single point on the X-bar chart will fall between the mean and plus one sigma is 0.68 0.34 0.15 0.5017. Visual controls cab be Charts, graphs Signs, digital readouts Colors, shapes, arrows All the above18. One of the following is not a test for special cause in C chart 1 point more than 3 standard deviations from the center point 9 points in a row on the same side of the center line 14 points in a row, alternating up and down 8 points in a row> 1 standard deviation from the center line19. In a np-chart The chart plots number of defectives The center line is the average number of defects Control limits are ragged All the above20. All the statements below are true about X-bar and S chart, EXCEPT: In the X-bar chart, the center line is the mean of the subgroup means In the S chart, the center line is the standard deviation of the subgroup standard deviations In the S chart, the center line is the average of the subgroup standard deviations The X-bar chart can be out of control, even if the S-chart is in control 21. Difference between p-chart and np-chart is p-chart is for defectives data while np-chart is for defects data p-chart plots proportion of defects while np-chart plots counts of defects p-chart is used for defectives data with fixed sample size, while np-chart is for variable sample size. None of the above22. Calls abandoned daily are monitored. An appropriate control chart will be U chart I-MR chart NP chart P chart23. A _________is sometimes used in place of a control chart or until enough data are collected to construct a control chart. activity chart run chart pre-control chart scatter plot24. Towards the final stages of the LSS project it is important to prepare the lessons learned document because; The items captured here will help shape and refine how future projects are performed Anytime an action has an unexpected outcome, the event should be logged to make stakeholders aware for future issues of the same type Documenting helps in avoiding “recreating the wheel’ every time All the above
