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Quality Control & Assurance Flashcards

7 cards from real PCB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Quality Control & Assurance flashcards as text

  1. What does AOI stand for in PCB manufacturing quality control?

    Answer: Automated Optical Inspection

    AOI (Automated Optical Inspection) uses cameras and image processing to detect surface defects on PCBs without electrical testing.

  2. Which IPC standard specifically governs acceptability of printed circuit board assemblies?

    Answer: IPC-A-610

    IPC-A-610 'Acceptability of Electronic Assemblies' is the most widely used electronics assembly acceptance standard in the industry.

  3. In IPC classification, a Class 3 PCB is intended for which application?

    Answer: High-reliability military and life-support systems

    IPC Class 3 designates high-reliability products where failure cannot be tolerated, such as military, aerospace, and life-support equipment.

  4. What is the purpose of a first article inspection (FAI) in PCB production?

    Answer: To inspect only the first board of each production run for conformance

    FAI verifies that the first produced unit from a new setup meets all design and specification requirements before full production proceeds.

  5. Measles or crazing on a PCB laminate most commonly indicates which condition?

    Answer: Mechanical stress or thermal shock causing fiber separation

    Measles (crazing) appear as white spots within the laminate where glass fibers have separated from the resin due to mechanical or thermal stress.

  6. What does CPK (process capability index) measure in PCB manufacturing quality?

    Answer: How well a process performs relative to specification limits considering centering

    CPK measures process capability while accounting for how centered the process mean is within specification limits; higher CPK indicates a more capable, centered process.

  7. Which defect is described as a hole in the PCB that is smaller than its design diameter after drilling?

    Answer: Undersize drill

    An undersize drill defect occurs when the drilled hole diameter falls below the minimum tolerance specified in the design, often due to drill wear or incorrect bit selection.