CPT Quality Practices & Measurement 2

Question 1

What does a control chart's 'upper control limit' (UCL) represent?

Accepted Answer

Three standard deviations above the process mean

Answer

The UCL is set at three standard deviations above the process mean, indicating the boundary beyond which variation is considered non-random.

Question 2

Which sampling method selects every nth item from a production run?

Accepted Answer

Systematic sampling

Answer

Systematic sampling selects every nth item at fixed intervals throughout the production run.

Question 3

What is the purpose of a fishbone (Ishikawa) diagram in quality management?

Accepted Answer

Identify root causes of a problem

Answer

A fishbone diagram visually maps potential causes of a problem, organized by categories like machine, method, material, and manpower.

Question 4

A gauge with a resolution of 0.001 inch is used to measure a part tolerance of ±0.005 inch. This gauge resolution is considered:

Accepted Answer

Adequate for the measurement

Answer

A gauge resolution of 0.001 inch can distinguish increments much smaller than the ±0.005 inch tolerance, making it adequate.

Question 5

Which quality cost category includes the cost of inspecting incoming raw materials?

Accepted Answer

Appraisal costs

Answer

Incoming inspection is an appraisal activity — it evaluates product or process quality before further processing.

(CPT) Certified Production Technician Practice Test