CID Quality Control & Process Improvement 3 — Questions and Answers
Question 1: IPC-6012 Class 3/A designation is specifically required for which type of interconnect application?
- Consumer electronics
- Automotive infotainment
- Space and military life-support (Correct answer)
- Industrial control panels
Correct answer: Space and military life-support
Class 3/A (formerly Class 3S) applies to space and military hardware where continued performance is critical and field repair is impossible.
Question 2: Which process improvement methodology uses PDCA cycles as its core iterative framework?
- Six Sigma DMAIC
- Lean manufacturing
- Kaizen / ISO Kaizen (Correct answer)
- Design of Experiments (DOE)
Correct answer: Kaizen / ISO Kaizen
Kaizen (continuous improvement) is built on the Plan-Do-Check-Act cycle for iterative, incremental process enhancement.
Question 3: What is the primary purpose of an Automated Optical Inspection (AOI) system in PCB fabrication quality control?
- Measuring dielectric constant of laminates
- Detecting surface defects and dimensional deviations (Correct answer)
- Testing via barrel plating thickness
- Verifying impedance of controlled traces
Correct answer: Detecting surface defects and dimensional deviations
AOI systems use cameras and image processing algorithms to detect surface-level defects such as opens, shorts, missing features, and dimensional deviations.
Question 4: In a control chart analysis, eight consecutive points on the same side of the center line indicate:
- Normal process variation
- A process shift requiring investigation (Correct answer)
- Measurement system error only
- Acceptable common cause variation
Correct answer: A process shift requiring investigation
Eight or more consecutive points on one side of the centerline is a run rule violation signaling a non-random process shift that requires investigation.
Question 5: Which IPC standard governs the design and performance requirements for rigid-flex PCBs?
- IPC-2223
- IPC-6013 (Correct answer)
- IPC-A-610
- IPC-2581
Correct answer: IPC-6013
IPC-6013 specifies performance and qualification requirements for flexible and rigid-flex printed boards.
Question 6: During DFM (Design for Manufacturability) review, which via characteristic most significantly affects plating reliability in high-aspect-ratio holes?
- Via pad annular ring size
- Hole aspect ratio (Correct answer)
- Via drill tolerance
- Soldermask web between vias
Correct answer: Hole aspect ratio
High aspect ratios make it difficult for electroless and electrolytic plating chemistries to achieve uniform copper coverage deep in the barrel, causing reliability defects.
Question 7: A Gauge Repeatability and Reproducibility (GR&R) study is conducted to evaluate:
- Process capability relative to specifications
- The measurement system's contribution to total observed variation (Correct answer)
- Defect density trends over time
- Material property uniformity across a laminate panel
Correct answer: The measurement system's contribution to total observed variation
GR&R quantifies how much of the total observed variation is attributable to the measurement system versus actual part-to-part variation.
CID Quality Control & Process Improvement 3
IPC-6012 Class 3/A designation is specifically required for which type of interconnect application?