OIT Quality Assurance and Improvement 5

Question 1

What is the difference between 'special cause' and 'common cause' variation in statistical process control?

Accepted Answer

Common cause is inherent to the process; special cause is due to an identifiable external factor

Answer

Common cause variation is the natural, inherent variation in a stable process, while special cause variation is unexpected variation from an identifiable source that needs corrective action.

Question 2

Which corrective action document formally records a customer complaint, root cause, corrective action, and preventive measures in automotive and industrial supply chains?

Accepted Answer

8D Report

Answer

The 8D (Eight Disciplines) report is a structured problem-solving methodology used to document the problem, root cause, corrective actions, and prevention steps for customer-reported issues.

Question 3

During a quality audit, an auditor finds that operators are not following the documented work instructions. This finding is categorized as a:

Accepted Answer

Nonconformance

Answer

A nonconformance is a finding where actual practice does not conform to a documented requirement, standard, or procedure.

Question 4

In FMEA (Failure Mode and Effects Analysis), the Risk Priority Number (RPN) is calculated as:

Accepted Answer

Severity × Occurrence × Detection

Answer

RPN is calculated by multiplying Severity, Occurrence, and Detection scores (each rated 1–10), with higher RPNs indicating higher priority for corrective action.

Question 5

A machinist measures the same part ten times with the same gauge and gets slightly different readings each time. This variation is due to:

Accepted Answer

Repeatability error

Answer

Repeatability error is the variation seen when the same operator measures the same part multiple times with the same gauge under the same conditions.

(OIT) Ontario Industrial Trades Certification Practice Test

(OIT) Ontario Industrial Trades Certification Practice Test

OIT Quality Assurance and Improvement 5