CPT Quality Practices & Measurement 3

Question 1

What does a Cp value of 1.33 indicate about a process?

Accepted Answer

The process has good capability with a margin

Answer

Cp of 1.33 means the process spread fits within the tolerance with roughly a 25% margin on each side, indicating good capability.

Question 2

Which of the following best describes 'measurement uncertainty'?

Accepted Answer

A parameter that characterizes the dispersion of measured values

Answer

Measurement uncertainty is a quantified estimate of the range of values within which the true value likely falls.

Question 3

In a Pareto analysis of defects, which defects should be addressed first?

Accepted Answer

The defects with the highest frequency or cost

Answer

Pareto analysis follows the 80/20 rule — addressing the vital few defects with highest frequency or cost yields the greatest quality improvement.

Question 4

What is 'gage repeatability' in a Gage R&R study?

Accepted Answer

Variation when the same operator measures the same part multiple times

Answer

Repeatability measures the gage's inherent variation when one operator repeatedly measures the same part under the same conditions.

Question 5

Which SPC rule indicates a potential process shift when 9 consecutive points fall on one side of the centerline?

Accepted Answer

Rule 2 – Nine points in a row on one side

Answer

The Nelson/Western Electric rule identifying 9 consecutive points on one side of the centerline signals a likely process mean shift.

(CPT) Certified Production Technician Practice Test