CRE Corrective Action and Continuous Improvement Flashcards
6 cards from real CRE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CRE Corrective Action and Continuous Improvement flashcards as text
The primary Six Sigma metric for measuring process capability is expressed as:
Answer: Process sigma level, where 6σ corresponds to 3.4 defects per million opportunities
Six Sigma defines process quality in terms of sigma level; a 6σ process produces only 3.4 DPMO.
On a standard control chart, the Upper Control Limit (UCL) is typically set at:
Answer: 3 standard deviations above the process mean
Control limits at ±3σ from the mean represent the bounds of natural process variation with approximately 99.73% of data within limits.
Which type of control chart is used to monitor the fraction (proportion) of defective items in a process?
Answer: p-chart
The p-chart monitors the proportion of nonconforming items in each sample and is used for attribute data.
Design of Experiments (DOE) in reliability improvement is used to:
Answer: Systematically study the effect of multiple factors on a reliability response
DOE allows engineers to efficiently evaluate main effects and interactions of multiple variables on reliability simultaneously.
Reliability Growth testing using the Duane postulate tracks improvement by monitoring:
Answer: Increasing cumulative MTBF as failures are discovered and corrected during development
The Duane model plots cumulative failures versus cumulative test time on log-log paper to demonstrate reliability improvement.
A lessons-learned database in a reliability program primarily serves to:
Answer: Capture knowledge from past failures and successes to prevent recurrence on future programs
Lessons-learned systems institutionalize engineering knowledge so that previously solved problems are not repeated on new designs.