ISA CAP Quality Assurance & Improvement 3

Question 1

Which of the following best describes the purpose of a fishbone (Ishikawa) diagram?

Accepted Answer

Identify and organize potential root causes of a problem

Answer

A fishbone diagram (cause-and-effect diagram) organizes potential root causes into categories to facilitate structured root cause analysis.

Question 2

In acceptance sampling, what does the Operating Characteristic (OC) curve show?

Accepted Answer

The probability of accepting a lot as a function of its actual defect level

Answer

The OC curve plots the probability of lot acceptance against the actual incoming quality level, characterizing the sampling plan's discrimination ability.

Question 3

A process engineer notices the X-bar chart is in control but the R chart shows points above the upper control limit. The most likely cause is:

Accepted Answer

Process variation has increased

Answer

Points above the UCL on the R chart indicate increased within-subgroup variation, signaling a special cause affecting process spread.

Question 4

What is the Risk Priority Number (RPN) in FMEA calculated as?

Accepted Answer

Severity × Occurrence × Detection

Answer

RPN = Severity × Occurrence × Detection, providing a numerical ranking to prioritize which failure modes require the most urgent corrective action.

Question 5

Which sampling method selects every nth unit from a production stream?

Accepted Answer

Systematic sampling

Answer

Systematic sampling selects items at fixed intervals (every nth unit) throughout the production run.

(ISA CAP) ISA Certified Automation Professional Practice Test

(ISA CAP) ISA Certified Automation Professional Practice Test

ISA CAP Quality Assurance & Improvement 3