TS Measurement Systems Analysis (MSA) 3

Question 1

Per AIAG MSA guidelines, what is the minimum acceptable Number of Distinct Categories (NDC) for a measurement system used in process control?

Accepted Answer

5

Answer

AIAG MSA guidelines require an NDC of 5 or more for a measurement system used in process control, meaning it must reliably distinguish at least 5 non-overlapping groups of parts.

Question 2

A linearity study reveals that a measurement device's bias increases as measured values increase across its range. The most appropriate corrective action is to:

Accepted Answer

Recalibrate or repair the gauge to correct the systematic non-linearity

Answer

A non-constant bias across the measurement range indicates a linearity problem that requires recalibration or repair of the gauge to restore accuracy throughout its operating range.

Question 3

Cohen's Kappa statistic in an attribute gauge study is used to:

Accepted Answer

Measure the agreement between appraisers beyond what would be expected by chance

Answer

Cohen's Kappa measures inter-rater agreement while accounting for the probability of chance agreement, providing a more meaningful assessment than simple percent agreement.

Question 4

A nested (hierarchical) GR&R study design should be used instead of a crossed design when:

Accepted Answer

Parts are destroyed or significantly altered during measurement and cannot be re-measured by multiple appraisers

Answer

A nested GR&R design is used when destructive or semi-destructive testing prevents the same part from being measured multiple times — each appraiser measures unique samples from the same process.

Question 5

When a GR&R study shows that %GRR is greater than 30%, what is the recommended course of action?

Accepted Answer

Investigate root causes of measurement variation and improve or replace the measurement system

Answer

A %GRR above 30% indicates an unacceptable measurement system that should not be used for process control or inspection without first correcting the excessive variation sources.

(TS) Test Specialist Certification Practice Test

(TS) Test Specialist Certification Practice Test

TS Measurement Systems Analysis (MSA) 3