CPIM Quality and Continuous Improvement 5 — Questions and Answers
Question 1: What is the purpose of a gauge R&R (Repeatability and Reproducibility) study?
- Assess whether a measurement system contributes excessive variation relative to the process or specification (Correct answer)
- Verify that suppliers meet AQL requirements
- Determine the process capability index Cpk
- Calibrate control chart limits
Correct answer: Assess whether a measurement system contributes excessive variation relative to the process or specification
Gauge R&R evaluates how much of total observed variation comes from the measurement system itself (repeatability and reproducibility) versus the actual process.
Question 2: A Cpk value of 1.33 for a process means:
- The process is barely capable and needs immediate improvement
- The process is centered and producing output well within specification limits (Correct answer)
- The process mean is shifted toward one specification limit but still capable
- The process is out of control
Correct answer: The process is centered and producing output well within specification limits
A Cpk of 1.33 corresponds to a 4-sigma process, which is considered capable and acceptable in most industries.
Question 3: In the PDCA (Plan-Do-Check-Act) cycle, what happens during the 'Check' phase?
- Develop hypotheses about process improvement
- Implement the improvement on a small scale
- Evaluate results against the planned objectives (Correct answer)
- Standardize the improvement across the organization
Correct answer: Evaluate results against the planned objectives
The Check phase compares actual results from the 'Do' phase against the expected outcomes defined in the 'Plan' phase.
Question 4: Which quality philosophy introduced the concept of 'Zero Defects' and argued that 'quality is free' because prevention costs less than failure?
- W. Edwards Deming
- Joseph Juran
- Philip Crosby (Correct answer)
- Kaoru Ishikawa
Correct answer: Philip Crosby
Philip Crosby championed Zero Defects and argued that doing it right the first time eliminates costly rework and failure, making quality free.
Question 5: A manufacturer finds that 80% of customer returns are caused by 3 out of 25 product defect types. What quality principle does this illustrate?
- Central Limit Theorem
- Pareto Principle (80/20 rule) (Correct answer)
- Normal distribution assumption
- Taguchi loss function
Correct answer: Pareto Principle (80/20 rule)
The Pareto Principle states that roughly 80% of effects come from 20% of causes, helping teams prioritize the vital few issues.
Question 6: What does 'quality at the source' mean in a lean manufacturing environment?
- Purchasing only certified materials from approved suppliers
- Each worker is responsible for the quality of their own work and stops production if a defect is found (Correct answer)
- Final inspection is performed by a dedicated quality department
- Quality audits are conducted at the raw material source
Correct answer: Each worker is responsible for the quality of their own work and stops production if a defect is found
Quality at the source empowers each worker to detect and correct defects immediately, preventing them from being passed downstream.
Question 7: Which of the following is a key input used in Quality Function Deployment (QFD) to translate customer needs into technical requirements?
- Control chart data
- Voice of the Customer (VOC) (Correct answer)
- Failure mode and effects analysis (FMEA) outputs
- Statistical process control limits
Correct answer: Voice of the Customer (VOC)
QFD uses the Voice of the Customer as its primary input to structure how customer wants and needs are converted into product or process specifications.
CPIM Quality and Continuous Improvement 5
What is the purpose of a gauge R&R (Repeatability and Reproducibility) study?