Types of Defects in Product Testing
58 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of a repeatability and reproducibility (R&R) study?

  • To analyze customer satisfaction levels
  • To measure variation in a production process
  • To quantify the accuracy of a measurement system (correct)
  • To compare different manufacturing techniques
  • How are operators and parts selected in an R&R study?

  • Operators and parts are both randomly selected.
  • Operators and parts are both fixed.
  • Operators are fixed and parts are randomly selected. (correct)
  • Operators are randomly selected and parts are fixed.
  • What statistics are computed in an R&R study to quantify repeatability and reproducibility?

  • Confidence intervals
  • Mean and standard deviation
  • Key statistics specific to R&R (correct)
  • Variance and range
  • According to the provided text, when is a measurement system considered inadequate?

    <p>When over 30% error is observed</p> Signup and view all the answers

    Which error range is deemed acceptable in a measurement system based on the information provided?

    <p>10-30% error</p> Signup and view all the answers

    How does R&R relate to part variation and measurement system variation?

    <p>Part variation is higher than R&amp;R, which is lower than measurement system variation.</p> Signup and view all the answers

    What type of defect is described as likely to result in failure or to materially reduce the usability of the product?

    <p>Major defect</p> Signup and view all the answers

    Which type of defect is least likely to have any bearing on the effective use or operation of the unit?

    <p>Minor defect</p> Signup and view all the answers

    What does DPMO stand for in the context of defects per million opportunities?

    <p>Defects Per Million Opportunities</p> Signup and view all the answers

    Rolled Throughput Yield (RTY) is calculated as the product of the yields from each ____.

    <p>Minor process step</p> Signup and view all the answers

    What term is often used in services as an analogy to DPMO?

    <p>Errors Per Million Opportunities (EPMO)</p> Signup and view all the answers

    Which type of defect is described as one that will surely result in hazardous or unsafe conditions and prevent proper performance of the product?

    <p>Critical defect</p> Signup and view all the answers

    What is the total observed variation in production output due to?

    <p>Both natural variation and measurement system</p> Signup and view all the answers

    Which component of variation is what is actually desired to be measured?

    <p>True process variation</p> Signup and view all the answers

    What does metrology broadly refer to?

    <p>Science of measurement</p> Signup and view all the answers

    Which organizations assure uniform and accurate measures used in trade?

    <p>Weights and measures organizations</p> Signup and view all the answers

    What happens to the number of defects caught by an inspector with more parts and less orderly arrangement?

    <p>Decreases</p> Signup and view all the answers

    In the context of manual inspection, what decreases as the complexity increases?

    <p>Defect detection by inspectors</p> Signup and view all the answers

    What do the pre-control zones aim to ensure?

    <p>Relatively good capability of a process</p> Signup and view all the answers

    Why is it important to control a process according to the text?

    <p>To remove special causes and achieve high quality levels</p> Signup and view all the answers

    What is the purpose of setting pre-control lines in the process?

    <p>To divide the tolerance range into zones</p> Signup and view all the answers

    Why are many experts against relying on actual performance in a noncontrolled environment?

    <p>To achieve high quality and customer satisfaction</p> Signup and view all the answers

    What do the green, yellow, and red zones represent in pre-control?

    <p>Tolerance levels in a process</p> Signup and view all the answers

    Why are Cp, Cpl, Cpu, and Cpk indexes preferable over alternative actual performance measurement methods?

    <p>They represent ideal rather than actual performance</p> Signup and view all the answers

    What pattern is depicted in the image titled 'Cycles'?

    <p>A repeating sequence of points that form a cyclical pattern</p> Signup and view all the answers

    Which image illustrates a trend pattern?

    <p>Trend</p> Signup and view all the answers

    In the image titled 'Hugging Center Line', where are the points primarily located?

    <p>Clustered around the center line</p> Signup and view all the answers

    Which pattern is depicted in the image titled 'Hugging Control Limits'?

    <p>Points concentrated near the upper and lower control limits</p> Signup and view all the answers

    What does the number '9' represent in the context of these images?

    <p>The number of distinct patterns depicted</p> Signup and view all the answers

    Process capability is the ability of a process to produce output that conforms to specifications.

    <p>True</p> Signup and view all the answers

    A process capability study is designed to yield specific information about the performance of a process under ideal operating conditions.

    <p>False</p> Signup and view all the answers

    The proper way to express the results of a process capability study is to use the ratio of variances formula $\frac{\sigma_p^2}{\sigma_m^2}$.

    <p>True</p> Signup and view all the answers

    Process characterization studies are used to determine how a process performs under ideal conditions.

    <p>False</p> Signup and view all the answers

    Component variability studies are used to determine the relative contribution of different sources of variation, such as process factors and measurement system.

    <p>True</p> Signup and view all the answers

    Peak performance studies are used to determine how a process performs under actual operating conditions.

    <p>False</p> Signup and view all the answers

    MESA Products, Inc. implements ISO 9000 standards and the Baldrige framework to improve performance.

    <p>True</p> Signup and view all the answers

    Operations Management International operates and maintains fewer than 100 public and private measurement facilities.

    <p>False</p> Signup and view all the answers

    The term 'indicator' is used for measurements that are a direct and exclusive measure of performance.

    <p>False</p> Signup and view all the answers

    Good measures should be Simple, Measurable, Actionable, Related, and Timely (SMART).

    <p>True</p> Signup and view all the answers

    Cathodic protection systems control the oxidation of metal surfaces in underground and submerged structures.

    <p>False</p> Signup and view all the answers

    MESA Products, Inc. implemented a quality assurance specification that resulted in a decrease in product quality.

    <p>False</p> Signup and view all the answers

    The process capability indexes $C_p$, $C_{pl}$, $C_{pu}$, and $C_{pk}$ are preferable to alternative actual performance measurement methods.

    <p>True</p> Signup and view all the answers

    A repeatability and reproducibility (R&R) study aims to quantify the variation due to the measurement system itself, separate from the actual part-to-part variation.

    <p>True</p> Signup and view all the answers

    The green, yellow, and red zones in pre-control represent different levels of process performance, with green being the most desirable.

    <p>True</p> Signup and view all the answers

    Rolled Throughput Yield (RTY) is calculated as the sum of the yields from each process step.

    <p>False</p> Signup and view all the answers

    A measurement system is considered inadequate if the observed variation is solely due to the measurement system itself.

    <p>False</p> Signup and view all the answers

    The number '9' in the context of the images represents a defect that is likely to result in failure or materially reduce the usability of the product.

    <p>True</p> Signup and view all the answers

    The image titled 'Cycles' depicts a cyclical pattern in the data points.

    <p>True</p> Signup and view all the answers

    In the 'Hugging Center Line' image, the data points are clustered around the center control limit line.

    <p>False</p> Signup and view all the answers

    Pre-control zones divide the tolerance range into two equal halves.

    <p>True</p> Signup and view all the answers

    The number '9' represents the total number of images provided in the context.

    <p>True</p> Signup and view all the answers

    Cp, Cpl, Cpu, and Cpk indexes measure the actual process performance rather than ideal capability.

    <p>True</p> Signup and view all the answers

    The green, yellow, and red zones in pre-control represent different levels of process capability.

    <p>False</p> Signup and view all the answers

    $5x^2 + 3x - 7 = 0$ has two distinct real roots.

    <p>False</p> Signup and view all the answers

    The 'Hugging Control Limits' image depicts a pattern where data points are clustered close to the control limits.

    <p>True</p> Signup and view all the answers

    Experts recommend relying on actual process performance in an uncontrolled environment.

    <p>False</p> Signup and view all the answers

    The red zones in pre-control represent values outside the specification limits.

    <p>True</p> Signup and view all the answers

    $\int_0^1 x^2 ,dx = \frac{1}{3}$

    <p>True</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser