CRE Quality Control Procedures 2

Question 1

Which type of control chart is most appropriate for monitoring the proportion of defective items in a variable-size sample?

Accepted Answer

p-chart

Answer

The p-chart monitors the proportion (fraction) defective and accommodates variable sample sizes.

Question 2

In acceptance sampling, what does the Operating Characteristic (OC) curve depict?

Accepted Answer

The probability of acceptance versus the lot defect rate

Answer

The OC curve plots the probability of accepting a lot against its true defect rate, showing discrimination power.

Question 3

A process has a Cpk of 0.85. What does this indicate?

Accepted Answer

The process is not centered and is producing defects beyond specification limits

Answer

Cpk below 1.0 indicates the process is not capable; it is producing output outside at least one specification limit.

Question 4

Which quality tool is specifically designed to determine which input variables most significantly affect an output variable?

Accepted Answer

Design of Experiments (DOE)

Answer

DOE systematically varies input factors to quantify their individual and combined effects on process outputs.

Question 5

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

Accepted Answer

To quantify measurement system variation relative to process variation

Answer

Gage R&R assesses how much of the observed variation is due to the measurement system itself versus the actual process.

(CRE) Certified Reliability Engineer Practice Test