Six Sigma Black Belt Exam – DMAIC Comprehensive
Practice Questions (100 Items)
1. In Six Sigma, the primary goal of a Black Belt is to:
A. Manage daily production operations
B. Train Green Belts only
C. Reduce variation and improve processes
D. Lead and deliver cross-functional improvement projects
Rationale: Black Belts are responsible for leading major improvement
projects requiring advanced statistical and leadership skills.
2. Which of the following best describes DPMO?
A. Defects Per Manufacturing Output
B. Defects Per Million Outputs
C. Defects Per Million Opportunities
D. Defective Parts – Monthly Output
Rationale: DPMO measures the number of defects per one million
defect opportunities.
3. Which phase of DMAIC focuses on determining process capability?
A. Define
B. Measure
C. Analyze
D. Improve
Rationale: Process capability is evaluated during analysis to
understand baseline performance.
4. A SIPOC diagram is created during which phase?
,A. Analyze
B. Define
C. Control
D. Improve
Rationale: SIPOC is a high-level process mapping tool created in
Define to scope the process.
5. The Voice of the Customer (VOC) is translated into measurable
requirements using:
A. SIPOC
B. CTQ tree
C. Regression
D. ANOVA
Rationale: CTQ trees translate customer needs into measurable
performance indicators.
6. Which chart is used to evaluate normality?
A. C-chart
B. I-MR chart
C. Normal probability plot
D. Pareto chart
Rationale: Normal probability plots graphically assess how well data
fits a normal distribution.
7. Type I error occurs when:
A. You accept a false null hypothesis
B. You reject a true null hypothesis
C. You fail to detect a difference
D. You assume normality
Rationale: Type I error is rejecting the null hypothesis when it is
actually true.
, 8. A p-value less than alpha indicates:
A. Fail to reject H0
B. Reject H0
C. Accept H0
D. Does not support Ha
Rationale: If p < α, the null hypothesis is rejected.
9. What does an RPN represent in FMEA?
A. Reduced Process Noise
B. Risk Priority Number
C. Required Process Number
D. Root Process Normalization
Rationale: RPN = Severity × Occurrence × Detection.
10. The purpose of Design of Experiments (DOE) is to:
A. Collect random samples
B. Improve documentation
C. Identify cause-and-effect relationships
D. Improve control plans
Rationale: DOE systematically evaluates factors affecting outputs.
11. The X̄ -chart monitors:
A. Defects
B. Proportion defective
C. Process mean
D. Process range
Rationale: X̄ -charts track the average of subgroups over time.
12. Process capability indices such as Cp and Cpk require:
Practice Questions (100 Items)
1. In Six Sigma, the primary goal of a Black Belt is to:
A. Manage daily production operations
B. Train Green Belts only
C. Reduce variation and improve processes
D. Lead and deliver cross-functional improvement projects
Rationale: Black Belts are responsible for leading major improvement
projects requiring advanced statistical and leadership skills.
2. Which of the following best describes DPMO?
A. Defects Per Manufacturing Output
B. Defects Per Million Outputs
C. Defects Per Million Opportunities
D. Defective Parts – Monthly Output
Rationale: DPMO measures the number of defects per one million
defect opportunities.
3. Which phase of DMAIC focuses on determining process capability?
A. Define
B. Measure
C. Analyze
D. Improve
Rationale: Process capability is evaluated during analysis to
understand baseline performance.
4. A SIPOC diagram is created during which phase?
,A. Analyze
B. Define
C. Control
D. Improve
Rationale: SIPOC is a high-level process mapping tool created in
Define to scope the process.
5. The Voice of the Customer (VOC) is translated into measurable
requirements using:
A. SIPOC
B. CTQ tree
C. Regression
D. ANOVA
Rationale: CTQ trees translate customer needs into measurable
performance indicators.
6. Which chart is used to evaluate normality?
A. C-chart
B. I-MR chart
C. Normal probability plot
D. Pareto chart
Rationale: Normal probability plots graphically assess how well data
fits a normal distribution.
7. Type I error occurs when:
A. You accept a false null hypothesis
B. You reject a true null hypothesis
C. You fail to detect a difference
D. You assume normality
Rationale: Type I error is rejecting the null hypothesis when it is
actually true.
, 8. A p-value less than alpha indicates:
A. Fail to reject H0
B. Reject H0
C. Accept H0
D. Does not support Ha
Rationale: If p < α, the null hypothesis is rejected.
9. What does an RPN represent in FMEA?
A. Reduced Process Noise
B. Risk Priority Number
C. Required Process Number
D. Root Process Normalization
Rationale: RPN = Severity × Occurrence × Detection.
10. The purpose of Design of Experiments (DOE) is to:
A. Collect random samples
B. Improve documentation
C. Identify cause-and-effect relationships
D. Improve control plans
Rationale: DOE systematically evaluates factors affecting outputs.
11. The X̄ -chart monitors:
A. Defects
B. Proportion defective
C. Process mean
D. Process range
Rationale: X̄ -charts track the average of subgroups over time.
12. Process capability indices such as Cp and Cpk require:
