SPC Measurement System Analysis (MSA) 3

Question 1

What is 'resolution' (also called 'discrimination') in a measurement instrument?

Accepted Answer

The smallest detectable increment or unit the instrument can read

Answer

The maximum load the instrument can measure

Answer

The difference between the instrument's maximum and minimum range

Answer

The time required to obtain a stable reading

Question 2

A rule of thumb in MSA states that an instrument's resolution should be no greater than what fraction of the process variation or tolerance?

Accepted Answer

1/10

Answer

1/2

Answer

1/5

Answer

1/20

Question 3

If a Gauge R&R study shows a high %GRR (e.g., 45%), which corrective action is most directly appropriate?

Accepted Answer

Investigate and reduce sources of measurement variation such as gauge wear, operator technique, or fixturing

Answer

Reduce the number of parts inspected per shift

Answer

Widen the specification limits to accommodate measurement variation

Answer

Increase the sample size in the next production run

Question 4

What does 'reproducibility' measure in a Gauge R&R study?

Accepted Answer

The variation in average measurements produced by different operators using the same gauge on the same parts

Answer

The variation when one operator measures the same part repeatedly

Answer

The ability to reproduce calibration certificates across labs

Answer

The consistency of the process output over multiple production runs

Question 5

In Attribute MSA, a 'miss rate' (false negative) occurs when:

Accepted Answer

An operator accepts a part that is actually defective

Answer

An operator accepts a part that is actually good

Answer

An operator rejects a part that is actually defective

Answer

An operator measures a part twice with the same result

Question 6

Which of the following best describes a 'false alarm rate' (Type I error) in Attribute MSA?

Accepted Answer

Rejecting a conforming (good) part as though it were defective

Answer

Rejecting a part that is actually nonconforming

Answer

Accepting a part that is actually nonconforming

Answer

Measuring the same part twice and getting different results

Question 7

What is the minimum recommended number of parts (samples) for a standard crossed Gauge R&R study per AIAG guidelines?

Accepted Answer

10 parts, 3 operators, 2 replicates

Answer

5 parts, 2 operators, 2 replicates

Answer

20 parts, 5 operators, 3 replicates

Answer

3 parts, 3 operators, 5 replicates