CQE (CQE) 5 — Questions and Answers
Question 1: A quality engineer discovers that outgoing product has been shipped with a known defect without customer notification. The most appropriate first action is to:
- Rework future production to prevent recurrence
- Notify the customer and initiate a containment response (Correct answer)
- Update the inspection procedure to catch the defect earlier
- File an internal corrective action report for future reference
Correct answer: Notify the customer and initiate a containment response
Immediate customer notification and containment are ethical and contractual obligations when defective product has already shipped.
Question 2: The acceptance quality limit (AQL) in an acceptance sampling plan defines:
- The maximum number of defectives allowed in any single lot
- The worst quality level still considered acceptable as a process average (Correct answer)
- The probability of accepting a lot at exactly the RQL
- The minimum sample size required for lot sentencing
Correct answer: The worst quality level still considered acceptable as a process average
AQL is the maximum percent nonconforming (or defects per hundred units) that is still considered a satisfactory process average for sampling purposes.
Question 3: Which lean concept focuses on producing only what the next process step needs, only when needed?
- 5S workplace organization
- Poka-yoke error proofing
- Just-in-Time (JIT) production (Correct answer)
- Heijunka production leveling
Correct answer: Just-in-Time (JIT) production
Just-in-Time production eliminates overproduction waste by synchronizing output to downstream demand signals such as kanban cards.
Question 4: When calibrating a measurement instrument, traceability means the calibration results are:
- Documented in a calibration management software system
- Linked to national or international measurement standards through an unbroken chain (Correct answer)
- Performed by an accredited laboratory using ISO 17025
- Verified by comparing two instruments of the same model
Correct answer: Linked to national or international measurement standards through an unbroken chain
Metrological traceability requires an unbroken chain of calibrations connecting the instrument to a recognized national measurement institute such as NIST.
Question 5: A process producing 3.4 defects per million opportunities (DPMO) operates at approximately which sigma level?
- 3 sigma
- 4 sigma
- 5 sigma
- 6 sigma (Correct answer)
Correct answer: 6 sigma
Six Sigma is defined as a process capability producing no more than 3.4 DPMO, assuming a 1.5-sigma long-term shift in the mean.
Question 6: The primary difference between verification and validation in product development is:
- Verification uses statistical tests; validation uses physical tests
- Verification confirms the product was built correctly; validation confirms the right product was built (Correct answer)
- Validation occurs during design; verification occurs during production
- Verification is performed by engineers; validation is performed by customers
Correct answer: Verification confirms the product was built correctly; validation confirms the right product was built
Verification asks 'Did we build it right?' (compliance to design specifications); validation asks 'Did we build the right thing?' (fitness for intended use).
Question 7: Which tool is best suited for systematically identifying potential failures in a new product design before production begins?
- Control chart
- Design FMEA (Correct answer)
- Process capability study
- Gauge R&R
Correct answer: Design FMEA
Design FMEA proactively identifies potential failure modes, their effects, and mitigations during the design phase, before tooling or production begins.
CQE (CQE) 5
A quality engineer discovers that outgoing product has been shipped with a known defect without customer notification.
The most appropriate first action is to: