CQI CQI Metrology & Measurement Systems 2 — Questions and Answers
Question 1: What does GR&R stand for in measurement systems analysis?
- General Reliability and Repeatability
- Gage Repeatability and Reproducibility (Correct answer)
- Gauge Reliability and Range
- General Range and Resolution
Correct answer: Gage Repeatability and Reproducibility
GR&R stands for Gage Repeatability and Reproducibility, a study used to evaluate the variation within a measurement system.
Question 2: What does 'repeatability' measure in a GR&R study?
- Variation between different operators
- Variation when the same operator measures the same part multiple times with the same instrument (Correct answer)
- Variation between different instruments
- Variation between different parts
Correct answer: Variation when the same operator measures the same part multiple times with the same instrument
Repeatability measures the variation attributed to the measurement instrument when used repeatedly under identical conditions by the same operator.
Question 3: What does 'reproducibility' measure in a GR&R study?
- Variation within a single operator's repeated measurements
- Variation between different operators using the same instrument (Correct answer)
- Variation due to environmental conditions
- The precision of the instrument
Correct answer: Variation between different operators using the same instrument
Reproducibility measures the variation that occurs when different operators use the same instrument to measure the same parts.
Question 4: A GR&R study result showing 30% of process variation attributed to the measurement system is generally considered:
- Acceptable
- Marginal and may require improvement (Correct answer)
- Excellent
- Perfect
Correct answer: Marginal and may require improvement
A GR&R value between 10% and 30% is considered marginal and may require corrective action depending on the application.
Question 5: What is the minimum recommended number of operators in a standard GR&R study?
- 1
- 2
- 3 (Correct answer)
- 5
Correct answer: 3
A standard GR&R study uses 3 operators, 10 parts, and 2-3 replications to adequately characterize measurement system variation.
Question 6: Which AIAG manual is the primary reference for Measurement System Analysis (MSA)?
- APQP manual
- FMEA manual
- MSA manual (Correct answer)
- PPAP manual
Correct answer: MSA manual
The AIAG Measurement System Analysis (MSA) manual is the primary reference for conducting and evaluating measurement systems in manufacturing.
CQI CQI Metrology & Measurement Systems 2
What does GR&R stand for in measurement systems analysis?