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Quality Control & Reliability Engineering Flashcards

7 cards from real CPE 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 & Reliability Engineering flashcards as text

  1. Process capability index Cp is calculated using which formula?

    Answer: Cp = (USL - LSL) / 6σ

    Cp = (USL − LSL) / 6σ, where USL and LSL are the upper and lower specification limits and σ is the process standard deviation; a Cp ≥ 1.33 is generally considered capable.

  2. How does the Cpk index differ from the Cp index in process capability analysis?

    Answer: Cpk accounts for process centering relative to the specification limits while Cp does not

    Cpk = min[(USL − X̄)/3σ, (X̄ − LSL)/3σ], incorporating how centered the process mean is within the specification limits, unlike Cp which only measures spread.

  3. What is the purpose of a Gauge Repeatability and Reproducibility (Gauge R&R) study?

    Answer: To quantify the variation in measurements attributed to the measurement system itself

    A Gauge R&R study separates measurement variation into repeatability (equipment variation) and reproducibility (appraiser variation), ensuring the measurement system is adequate relative to process variation.

  4. Weibull analysis in reliability engineering is primarily used for which purpose?

    Answer: Modeling and analyzing failure time data to estimate product life and failure patterns

    Weibull analysis fits failure time data to the Weibull distribution to estimate parameters such as characteristic life and shape factor, enabling prediction of failure probabilities and remaining life.

  5. In reliability block diagrams (RBDs), components connected in series have what effect on overall system reliability?

    Answer: System reliability is lower than the reliability of the least reliable component

    For series systems, overall reliability = R1 × R2 × … × Rn; since each factor is less than 1, the product is always lower than the least reliable individual component.

  6. A control plan in manufacturing quality systems is best described as:

    Answer: A document describing the controls for each process step to ensure product quality

    A control plan documents the process controls, inspection methods, frequency, reaction plans, and responsible parties for each step in a manufacturing process to ensure consistent quality output.

  7. Which quality cost category includes the cost of scrap, rework, and warranty repairs?

    Answer: Internal and external failure costs

    Failure costs are divided into internal failures (scrap, rework discovered before delivery) and external failures (warranty, returns, field repairs discovered after delivery).