Quality Control Procedures Flashcards
7 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 7 Quality Control Procedures flashcards as text
Which corrective action methodology uses the 8D (Eight Disciplines) approach?
Answer: A structured team-based problem-solving process originally developed by Ford Motor Company
The 8D process is a Ford-originated team problem-solving method with eight structured steps from team formation to preventing recurrence.
In statistical process control, the term 'rational subgrouping' means:
Answer: Grouping samples so variation within subgroups reflects only common cause variation
Rational subgroups capture short-term common cause variation within groups so that between-group variation reveals special causes.
What is the primary purpose of a Pre-Control chart?
Answer: To provide simple setup verification and ongoing process monitoring without requiring statistical training
Pre-Control uses specification limits divided into colored zones to give operators simple go/no-go process guidance without complex calculations.
A lot disposition of 'use-as-is' (UAI) requires:
Answer: Engineering review and written approval that the nonconforming item meets fit, form, and function requirements
Use-as-is disposition requires engineering authority to confirm that the deviation does not affect the part's intended function.
Which sampling scheme is appropriate when process quality is expected to be consistent and lot-by-lot inspection is too costly?
Answer: Skip-lot sampling
Skip-lot sampling inspects only a fraction of submitted lots when a supplier demonstrates sustained quality history, reducing inspection cost.
What does ANSI/ASQ Z1.4 govern?
Answer: Sampling procedures and tables for inspection by attributes
ANSI/ASQ Z1.4 provides attribute sampling tables, AQL levels, and inspection levels for lot-by-lot acceptance sampling.
In quality control, what is the purpose of a CUSUM (Cumulative Sum) chart compared to a standard X-bar chart?
Answer: CUSUM detects small, sustained process shifts more quickly by accumulating deviations from the target
CUSUM charts sum deviations from target over time, making them more sensitive to small persistent shifts than the standard Shewhart X-bar chart.