Free Lean Six Sigma Black Belt Exam Practice Test
Attempt Lean Six Sigma Black Belt (LSSBB) practice test questions and test your skills. This free LSSBB Exam material simulates the actual certification exam.
- 100 Questions,
- 180 Minutes
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Attempt Lean Six Sigma Black Belt (LSSBB) practice test questions and test your skills. This free LSSBB Exam material simulates the actual certification exam.
Certified Lean Six Sigma Black Belt
You'll become an expert in efficiency and excellence with Lean Six Sigma Black Belt training. Learn practical applications of LSSBB in ...
1. This is a FREE test and can be attempted multiple times. But it is recommended to take the test when you are ready for best practice experience.
2. Test Duration: 180 Minutes
3. Number of questions: 100 Multiple Choice Questions
4. Each question has multiple options out of which one or more may be correct
5. You can pause the test in between and you are allowed to re-take the test later. Your test will resume from where you left, but the test time will be reduced by the amount of time you’hv taken in the previous attempt.
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Answer: (b) The purpose of Six Sigma is to reduce variation from any process and product. As variation is reduced, the quality is increased.
Answer: (a) Six Sigma is a business philosophy focused on driving continuous and breakthrough improvement.
Answer: (b) DMAIC is a Six Sigma problem solving methodology that stands for Define, Measure, Analyze, Improve, and Control.
Answer: (d) DFSS is Six Sigma methodology that stands for "Design for Six Sigma" used while designing new processes.
Answer: (a) If your process is delivering less than 3.4 defects per million opportunities, then you can call your process as performing at Six Sigma level.
Answer: (c) DMADV is Six Sigma methodology that is used when developing a new process. It stands for "Define, Measure, Analyze, Design, and Verify."
Answer: (d) It is all of the above. The purpose of the Tollgate is to ensure plans are completed successfully, acquire formal sign-off from stakeholders and then review the progress and kick off the next phase.
Answer: (b) The primary role of Master Black Belt is to provide guidance, train, coach, and mentor Black Belts for Six Sigma projects.
Answer: (d) It is the Champion that is responsible for evangelizing Six Sigma and providing resources and support for Six Sigma projects
Answer: (a) Six Sigma Black Belt level projects are expected to provide returns of more than 200,000 USD annually.
Answer: (d) The VOC mechanism is used to capture stated or unstated customer needs or requirements.
Answer: (d) The Black Belt is typically a full-time role that is responsible for leading enterprise-wide large scale projects and mentoring Green Belts.
Answer: (b) The Black Belt is expected to work closely with Master Black Belt and Senior Management to communicate the benefits of Six Sigma, change efforts, and build confidence in the team.
Answer: (a) The Six Sigma Black Belt and Master Black Belt usually conduct the assessment in a closed loop to make sure that all aspects of Six Sigma have been implemented in the project.
Answer: (c) Ishikawa developed the Cause-and-Effect diagram, also known as Ishikawa tool or Fishbone diagram.
Answer: (d) It is always good to collect data directly from the customer, and surveys and questionnaires are a good way to collect these data.
Answer: (b) After the group brainstorms ideas, they can get them prioritized using the Nominal Group technique.
Answer: (a) SWOT stands for Strengths, Weakness, Opportunities, and Threats.
Answer: (d) Without executive commitment and support for a Six Sigma project, it would not be possible for anybody with or without Six Sigma experience to implement it successfully.
Answer: (c) Continual Improvement Process or CIP is a steady effort made to improve existing processes, products, or services in continuous, regular intervals or discrete jumps.
Answer: (a) When multiple data points related to positional, cyclical, and temporal variations are to be analyzed, multi-vari charts are most appropriate to be used.
Answer: (d) To collect data related to any process, always start with a Check Sheet. It is a good technique to capture problem symptoms.
Answer: (b) The purpose of having functional requirements is to provide details on how a product or service needs to operate.
Answer: (c) At 3 sigma level Defects per million opportunities are 66,807. Whereas at 4 sigma level it is at 6,210 defects per million. The factor reduction in defect is 10.758 which is rounded to 10.
Answer: (b) The major cause categories in Cause and Effect diagrams are man, material, methods, and machines, along with mother nature, management, and measurement systems.
Answer: (c) The control chart "u chart" is most appropriate to monitor the number of defects in different sample sizes.
Answer: (a) The 5 elements of Kaizen are Teamwork, Personal Discipline, Improve Morale, Quality Circles, and Suggestions for Improvement
Answer: (a) The 5 principles of Lean are Identify Value, Map the Value Stream, Create Flow, Establish Pull, and Seek Perfection.
Answer: (c) Repeatability will help reduce variation between different measurements and similarly, reproducibility will help reduce variations across measurements by different people. Both of these will help, and true Measurement Accuracy will be achieved when the difference or deviation between the measured value and actual value is reduced.
Answer: (b) In a normal distribution, the area under +/- 1 standard deviation covers approx. 68% of the data.
Answer: (d) Risk Priority Number is generate by calculating product of severity x occurrence x detection.
Answer: (c) Any time and effort spent on testing, inspection, storage, and setup is a non-value added activity. The only activity that is adding any value to the product is process.
Answer: (b) Lean helps you understand what are value-add and non-value-add activities and helps you reduce the latter and eliminate waste.
Answer: (d) The Paired t test is used to determine performance before and after training.
Answer: (a) The Bar Chart type histogram is typically used to depict the frequency of occurrence of each of the measurement data.
Answer: (d) The purpose of the Control Chart is to show visually the expected performance of any process and set limits. It provides details about process performance over a period of time, which can be evaluated further as needed.
Answer: (b) Design for Test as a design technique that aims to introduce a testing capability in the manufacture of electronics. The goal of this technique is to introduce and validate the capability of diagnosing product defects.
Answer: (a) DFMEA (Design Failure Mode and Effect Analysis) is the application of the Failure Mode and Effects Analysis (FMEA) method specifically to product/service design.
Answer: (d) A pareto chart is used to graphically summarize and display the relative importance of the differences between groups of data.
Answer: (b) To begin a Six Sigma project, ensure that you have a well defined process. If such a process does not exist, it is advisable to first document the process and then start the project.
Answer: (c) An SIPOC diagram is a tool used by a team to identify all relevant elements of a process improvement project before work begins. It helps define a complex project that may not be well scoped and is typically employed at the Measure phase of the Six Sigma DMAIC (Define, Measure, Analyze, Improve, Control). methodology.
Answer: (d) For preparing SIPOC, we need to have answers to who the supplier, inputs, customers, process, and outputs are.
Answer: (a) The key measurement scales are Interval, Nominal, Ordinal, and Ratio.
Answer: (c) Nominal scales define or classify only the presence or absence of a certain attribute. With nominal scales, you can only count items and the statistics you can use is Percentage, Proportion and Chi-Square tests.
Answer: (d) An ordinal scale defines one item having more or less of the attribute than the other item. In simple words, it is a comparative scale of measurement. Example --- Taste and attractiveness. As statistical measures, Rank order correlation is typically used.
Answer: (c) The Ratio Scale defines all true zero value points. You can perform addition, subtraction, division and multiplication with such data points. Example --- Elapsed time, distance, etc.
Answer: (d) We can categorize data in three divisions --- Continuous or Variable, Discrete, and Attribute Data.
Answer(: b) Mean is the arithmetic average of all the data points and is popularly known as Arithmetic Mean. This is the most popular and most often used measure of Central Tendency in Six Sigma applications.
Answer: (c) Median, also known as Positional Mean, is the central location or position of the data list. Mean gets influenced by the outliers. Median doesn,t change much even with the introduction of Outliers.
Answer: (b) The measures of dispersion are Range, Variation, and Standard Deviation. Range is the difference between the maximum value and the minimum value. Variance is Average of Squared Mean Differences. Standard Deviation is Square root of Variance.
Answer: (a) MSA or GAGE RR is a tool that is used to validate the measurement system to see if the measurement system is able to give us data that can be relied on.
Answer: (c) Measurement system errors fall into 3 major categories: Resolution: The ability to provide granular readings Accuracy: Difference between observed measurement and actual measurement. Precision: Difference observed when measuring the same part with the same equipment or instrument.
Answer: (b) Measurement systems accuracy consists of: Stability: Consistency and predictability of measurements over time Bias: Change in the actual value with respect to reference value Linearity: A measure of bias values through a range of measurements
Answer: (c) Precision deals with repeatability and reproducibility. Repeatability also known as Equipment Variation. Reproducibility also known as Appraiser Variation.
Answer: (c) A good measurement system should possess the following properties or characteristics: Accuracy, Repeatability, Linearity, Reproducibility. and Stability. Bias is not one of the properties.
Answer (a) 1)Find the Average of Measurements. In this case, Xbar = 25.405 mm 2)Bias = Average - Reference Value = 25.405 - 25.4 mm = 0.05 mm 3)% Bias = 100 * (Bias/Tolerance) % = 100 * (0.05/0.5) % = 1%
Answer (d) An Xbar chart is used to observe and evaluate the behavior of a process over time and take corrective action if necessary. The chart plots the average values of a number of small sampled subgroups.
Answer (b) ?m = Gage Variation ?p = Part Variation ?t (Total Process Variation) = ?(?m2+ ?p2)
Answer (c) ?m = ?(?r2+ ?o2) where ?r = Repeatability or Equipment Variation ?o = Reproducibility or Appraiser Variation
Answer (b) % GRR = 100 * ?m /Tolerance % % PV = 100 * ?p /Tolerance % ndc = 1.41 * PV/GRR If %GRR > 30%, gage needs to be replaced.
Answer: (d) The sample size has to be determined statistically using formulas that take into consideration standard deviation or current error rate of the population.
Answer (b) The process expert who does rating of the samples is called a Master Appraiser.
Answer (a) As per SPC or Statistical Process Control, every measurable phenomenon is a statistical distribution, i.e. every set of observed data is a set of effects of unknown common causes.
Answer (a) The standard deviation of the averages denoted by SEM or Standard Error of Mean is represented by standard deviation of population divided by square root of sample size.
Answer ( c) Process Performance is not a measurement for capability index for continuous data.
Answer ( a) Cp = (USL-LSL)/(6 * ?), with USL LSL representing the Process Tolerance.
Answer (a) The Process Capability Index Cpk is the minimum of both Cpl and Cpu.
Answer ( c) If Cpk < Cp, mean is not centered. If Cpk = Cp, mean is centered and process is accurate.
Answer (d) Checking Resolution is the first activity in a Measure Stage.
Answer (d) Presence of Part Variation in the study indicates that it needs to be studied.
Answer (d) SIPOC is the best possible scoping tool for the project.
Answer (a) Process stability is the most important task to be done before any calculations are done in Measure.
Answer (a) With Discrete Data, DPMO/PPM are the best possible metrics showing capability.
Answer (d) Every Part Every Interval (EPEI) is the method for determining the batch size.
Answer: (c) A U chart is appropriate when sample size is variable and each sample may contain more than one instance of the targeted condition. These are control charts most appropriate for handling attributes data.
Answer: (c) The purpose of program evaluation and review techniques (PERT) analysis during the analyze phase of DMAIC is to identify the critical path of a process.
Answer: (b) Leveling by product typically includes the use of heijunka boxes. A heijunka box is a tool for scheduling in which the tasks to be completed and the estimated times for initiation and completion are listed. The point of leveling by product is to reduce inefficiency by adjusting the mix of products.
Answer: (b) Answer A is obviously incorrect, the control limits would have been set up correctly in the first place. Answer C is incorrect, the process is not out of control. Answer D is partially correct because as the process improves, we need to fix the limits as well. So Answer B is the correct answer.
Answer: (a) In an analysis of variance, the F statistic is used to compare the mean square treatment with the mean square error. The mean square treatment is the average variation between the subsets, while the mean square error is the sum of the squares of the residuals.
Answer: (a) A Value Stream have flow of activities that consist of value-added as well as non-value-added activities which take the raw material and deliver the end product to the customer. Value Stream Map is a visual representation of the same.
Answer: (c) Muda, Mura, and Muri are Warusa Kagen conditions.
Answer: (b) When analyzing the value stream, the Black Belt needs to first identify the Muda in the system. In typical cases, Muda accounts for 90% of the time spent in operations.
Answer: (a) C - Complexity - Unnecessary steps and excessive documentation L - Labor - Inefficient operations and excess headcount O - Overproduction - Producing more or producing before than customer needs S - Space - Storage space for inventory E - Energy - Wasted human energy D - Defects - Repair or Rework in products M - Materials - Scrap or ordering more than needed I - Idle time - Material sits for time T - Time - Time waste T - Transportation - Movement adding no value S - Safety hazards - Unsafe environments
Answer (a) The Spaghetti Chart helps understand the Physical Process Map and not necessarily just the Value Map. These charts graphically depict movement of products and people in a process.
Answer: (d) CE Diagram or Cause and Effect Diagram, also known as the Fishbone Diagram, is a very popular and an important tool that gives you a list of all the issues due to which a problem occurs.
Answer: (d) Box Plot is another useful tool that helps you to know the nature of variability in a process. It is also known as Whiskers Plot, Candlestick Plot, and Box and Whiskers Plot.
Answer: (a) These plots are often used in the Analyze phase to understand the process variability. They help you see distribution of values in several groups. Box plots also tell you information about location, spread, and variability of data.
Answer: (c) KPIV stands for Key Process Input Value. Typically, Fishbone Diagram would give an insight into the possible KPIVs for model.
Answer: (d) Design for manufacturability means that products are standardized and simplified so that there are fewer products with defects made in every production cycle. Product quality is held above simplicity is not introduced, hence, this is right choice for the question
Answer: (d) It is important that the methodology is applied in all the departments of the company and not limited to any specific groups. This is required to ensure that there are no blockages at a later stage and fruitful/positive results are seen as a output across the organization.
Answer: (d) Simple Linear Regression is to be used when you have one response variable (KPOV) and one predictor variable (KPIV) to test.
Answer: (b) Multiple Linear Regression is to be used when you have one response variable (KPOV) and two multiple predictor variables (KPIV) to test.
Answer: (b) VIF (Variance Inflation Factor). VIF shows the extent to which multicollinearity exists amongst predictors.
Answer: (c) Durbin Watson Statistic Tests are used to determine the presence of auto-correlation in residuals.
Answer: (d) PRESS stands for Predicted Residuals Sum of Squares in PRESS Statistic.
Answer: (a) In Stepwise Regression, the most significant variable is added or removed from the regression model. Three common Stepwise Regression procedures are Standard Stepwise, Forward Selection, and Backward Elimination. Use of Mallow's Cp Statistic in Stepwise Regression is popular.
Answer: (b) Confidence intervals give an estimated range of values, known as Margins or Confidence Interval widths, which are likely to include the parameter of the population.
Answer (c) Significance level and sample size impact the confidence interval - The choice of ? for the confidence intervals dictates the margin of error or confidence interval width. With increase in sample size at the same significance level, you will find that the confidence intervals width keeps decreasing.
Answer (d) The Chi-Square statistic can be used to determine the probability of variances occurring. ?2 = (n-1)s2/?2
Answer (c) ?2 = (n-1)s2/?2 = (30-1)0.6/1 = 29 * 0.6 = 17.4
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