Certified Six Sigma Black Belt Exam Measurement System Analysis 5

Question 1

What is the recommended minimum number of replicates per part-operator combination in a standard crossed Gage R&R study?

Accepted Answer

2

Answer

AIAG MSA guidelines recommend at least 2 replicates per part-operator combination to estimate repeatability, with 3 replicates providing better estimates.

Question 2

A Black Belt is analyzing a Gage R&R study where repeatability variance = 0.04 and reproducibility variance = 0.01. What percentage of R&R is due to repeatability?

Accepted Answer

80%

Answer

Repeatability / (Repeatability + Reproducibility) = 0.04 / (0.04 + 0.01) = 0.04 / 0.05 = 80%.

Question 3

Which of the following MSA components assesses whether a gage reads differently when the same part is measured from high to low versus low to high values?

Accepted Answer

Hysteresis

Answer

Hysteresis is the difference in readings when a measurement is approached from opposite directions, common in mechanical and pressure-sensing instruments.

Question 4

In MSA, 'expanded uncertainty' as defined in ISO/IEC 17025 is expressed as the measurement result ± U. The coverage factor k=2 corresponds approximately to which confidence level?

Accepted Answer

95%

Answer

A coverage factor of k=2 corresponds to approximately 95% confidence under a normal distribution, widely used in metrology laboratory reports.

Question 5

A process engineer wants to use a measurement system to set statistical process control (SPC) chart limits. Which MSA outcome most directly impacts the reliability of those control limits?

Accepted Answer

Gage R&R %Study Variation relative to process variation

Answer

Control chart limits are based on process variation; if gage variation is a large fraction of total variation, the control limits will be inflated and the chart will lose sensitivity to real process shifts.

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Measurement System Analysis 5