CPE Quality Control & Reliability Engineering 3

Question 1

Process capability index Cp is calculated using which formula?

Accepted Answer

Cp = (USL - LSL) / 6σ

Answer

Cp = (USL - LSL) / 3σ

Answer

Cp = (X̄ - LSL) / 3σ

Answer

Cp = σ / (USL - LSL)

Question 2

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

Accepted Answer

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

Answer

Cpk uses the full specification range while Cp uses only one side

Answer

Cpk requires a larger sample size than Cp

Answer

Cpk applies only to non-normal distributions while Cp assumes normality

Question 3

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

Accepted Answer

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

Answer

To determine if a gauge is accurate by comparing it to a calibration standard

Answer

To establish the frequency of gauge calibration intervals

Answer

To verify that the gauge range is adequate for the feature being measured

Question 4

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

Accepted Answer

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

Answer

Monitoring real-time process variation using control charts

Answer

Calculating the sample size needed for acceptance inspection

Answer

Prioritizing maintenance tasks based on failure consequences

Question 5

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

Accepted Answer

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

Answer

System reliability equals the highest individual component reliability

Answer

System reliability equals the average of all component reliabilities

Answer

System reliability is independent of individual component reliabilities

Question 6

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

Accepted Answer

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

Answer

A statistical analysis of historical defect rates

Answer

A schedule for planned preventive maintenance activities

Answer

A corrective action log for nonconforming products

Question 7

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

Accepted Answer

Internal and external failure costs

Answer

Prevention costs

Answer

Appraisal costs

Answer

Conformance costs