CQE Inspection and Testing Methods 3

Question 1

In a gage R&R study, 'repeatability' measures variation due to:

Accepted Answer

The same operator measuring the same part multiple times with the same gage

Answer

Repeatability (Equipment Variation) is the variation observed when one operator repeatedly measures the same part with the same gauge under identical conditions, reflecting the gauge's inherent measurement uncertainty.

Question 2

A process produces parts with a true mean of 50.1 mm against a target of 50.0 mm. The inspector's gauge consistently reads 50.3 mm. What type of measurement error is present?

Accepted Answer

Bias (accuracy error)

Answer

Bias is the systematic offset between the average measured value and the true (reference) value; here the gauge consistently reads 0.2 mm higher than the true part dimension.

Question 3

What is the purpose of a receiving inspection skip-lot program?

Accepted Answer

To reduce inspection frequency for suppliers with proven quality history while maintaining quality protection

Answer

Skip-lot programs reduce inspection frequency for suppliers demonstrating consistent quality, lowering inspection costs while maintaining quality protection through periodic sampling.

Question 4

In dimensional measurement, what does 'measurement uncertainty' represent?

Accepted Answer

The range within which the true value is expected to lie with a stated confidence level

Answer

Measurement uncertainty quantifies the doubt about a measurement result, expressing the range around the measured value within which the true value is expected to fall with a stated confidence level.

Question 5

Which inspection sampling approach is used when the cost of inspection is very high but the cost of passing a defective is also very high?

Accepted Answer

100% inspection (complete inspection)

Answer

When the consequences of defects reaching the customer are extremely high (safety-critical parts, high liability), 100% inspection is justified despite high cost to prevent any nonconforming units from escaping.

CQE - Certified Quality Engineer Practice Test

CQE - Certified Quality Engineer Practice Test

CQE Inspection and Testing Methods 3