Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt Certification MCQ 4 — Questions and Answers
Question 1: In Lean Six Sigma, 'Voice of the Customer' (VOC) data is most directly translated into measurable requirements using which tool?
- Pareto Chart
- Critical to Quality (CTQ) tree (Correct answer)
- Failure Mode and Effects Analysis (FMEA)
- Run Chart
Correct answer: Critical to Quality (CTQ) tree
A CTQ tree breaks down customer needs into specific, measurable quality characteristics that the process must deliver.
Question 2: Which DMAIC phase focuses on sustaining improvements and preventing the process from reverting to its old state?
- Analyze
- Improve
- Control (Correct answer)
- Measure
Correct answer: Control
The Control phase implements control plans, monitoring systems, and documentation to hold the gains achieved in the Improve phase.
Question 3: A process produces 50 defects out of 1,000 opportunities. What is the defect rate expressed as DPMO?
- 500
- 5,000
- 50,000 (Correct answer)
- 500,000
Correct answer: 50,000
DPMO = (Defects / Opportunities) × 1,000,000 = (50 / 1,000) × 1,000,000 = 50,000 DPMO.
Question 4: What is 'Poka-Yoke' in Lean Six Sigma?
- A Japanese method for workforce scheduling
- An error-proofing technique that prevents or detects mistakes before they become defects (Correct answer)
- A visual management system using color-coded bins
- A root cause analysis method using repeated 'why' questions
Correct answer: An error-proofing technique that prevents or detects mistakes before they become defects
Poka-Yoke (mistake-proofing) designs processes or devices so that errors are impossible or immediately obvious.
Question 5: Which of the following sigma levels corresponds approximately to 99.99966% defect-free output?
- 3 Sigma
- 4 Sigma
- 5 Sigma
- 6 Sigma (Correct answer)
Correct answer: 6 Sigma
Six Sigma quality corresponds to 3.4 DPMO, meaning 99.99966% of all products are defect-free.
Question 6: In a Lean environment, 'Pull' production is characterized by:
- Producing as much as possible to build inventory buffers
- Making products only when downstream demand signals are received (Correct answer)
- Scheduling production based on forecasted demand
- Producing in large batches to reduce setup time per unit
Correct answer: Making products only when downstream demand signals are received
Pull systems produce only what is needed, when it is needed, triggered by actual downstream consumption signals such as Kanban.
Question 7: A Pareto Chart is based on which principle?
- All defect causes contribute equally to total defects
- 80% of problems are caused by 20% of the causes (Correct answer)
- Variation is always normally distributed in a stable process
- Customer satisfaction directly correlates with process speed
Correct answer: 80% of problems are caused by 20% of the causes
The Pareto principle (80/20 rule) states that roughly 80% of effects come from 20% of causes, helping teams prioritize root causes.
Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt Certification MCQ 4
In Lean Six Sigma, 'Voice of the Customer' (VOC) data is most directly translated into measurable requirements using which tool?