Certified Quality Technician Questions Flashcards

Which control chart is most appropriate for monitoring the number of defects per unit when the sample size varies?

Answer: u-chart

The u-chart monitors the number of defects per unit and accommodates variable sample sizes.

A process has a Cp of 1.5 but a Cpk of 0.8. What does this indicate?

Answer: The process is capable but not centered

A Cp greater than 1 shows the process has sufficient spread capability, but Cpk less than 1 means the process mean is not centered within the specification limits.

In a Gage R&R study, what does 'reproducibility' measure?

Answer: Variation due to different operators measuring the same part

Reproducibility measures the variation in measurements when different operators measure the same part using the same gage.

Which sampling plan standard is commonly used for acceptance sampling by attributes in the US?

Answer: ANSI/ASQ Z1.4

ANSI/ASQ Z1.4 is the standard for sampling procedures and tables for inspection by attributes.

What is the purpose of a pre-control chart?

Answer: To provide early warning that a process is about to go out of control

Pre-control charts provide real-time early warning signals that a process is drifting toward the specification limits before nonconforming product is produced.

In a cause-and-effect diagram, the 6 M's typically include machines, methods, materials, measurement, mother nature, and:

Answer: Manpower

The six M's in a fishbone (Ishikawa) diagram are Machines, Methods, Materials, Measurement, Mother Nature (Environment), and Manpower (People).

A scatter diagram is used to:

Answer: Show the relationship between two variables

A scatter diagram plots pairs of numerical data to identify potential correlations or relationships between two variables.