Testing & Quality Assurance Flashcards
7 cards from real CPE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Testing & Quality Assurance flashcards as text
Which TAPPI test method measures the bursting strength of corrugated and solid fiberboard?
Answer: TAPPI T810
TAPPI T810 specifies the Mullen burst test for corrugated and solid fiberboard, measuring resistance to rupture under hydraulic pressure.
A packaging engineer applies a control chart to monitor seal strength. A single point falls above the upper control limit. This is best described as:
Answer: A special cause signal requiring investigation
A single point beyond a control limit is one of the Western Electric rules signaling a special cause that warrants immediate investigation to identify and eliminate the assignable cause.
What is the significance of the Critical-to-Quality (CTQ) tree in packaging development?
Answer: Maps customer requirements to measurable packaging specifications
A CTQ tree translates voice-of-the-customer requirements through drivers and needs into specific, measurable packaging quality characteristics.
During a humidity conditioning test per ASTM D4332, why is pre-conditioning of corrugated samples required before compression testing?
Answer: To equilibrate moisture content and ensure consistent, reproducible test results
Pre-conditioning standardizes the moisture content of corrugated specimens because paper-based packaging is highly sensitive to humidity, which dramatically affects compressive strength.
Which technique is most appropriate for detecting delamination defects in a multi-layer flexible laminate without cutting the material?
Answer: Ultrasonic C-scan imaging
Ultrasonic C-scan imaging uses high-frequency sound waves to detect internal voids, delaminations, or bond failures in laminates non-destructively.
A packaging engineer is designing a sampling plan using MIL-STD-1916 (or ANSI/ASQ Z1.4). What does the Acceptable Quality Level (AQL) represent?
Answer: The maximum percent defective that is acceptable on average over many lots
AQL is the worst acceptable average quality level expressed as percent defective; lots at this quality level will be accepted most of the time under the sampling plan.
Which environmental stress test is specifically designed to evaluate package performance under temperature cycling (thermal shock) conditions?
Answer: ISTA 7D thermal extremes test
ISTA 7D (and similar protocols) subjects packages to defined thermal cycling extremes to evaluate performance in environments such as desert heat, arctic cold, or rapid temperature swings.