Preparatory Certificate case studies
Preparatory Certificate · Put your knowledge to work in context.
The Preparatory Certificate is an entry-level multiple-choice credential for candidates who need to demonstrate foundational knowledge before moving into specialised study or supervised practice. It suits students preparing for further technical training, career changers building a base of knowledge, and working professionals who want a structured way to confirm core understanding. The Preparatory Certificate case studies are 5 cases and about 2,852 words.
1Expired Load Cell Calibration During Product Release
During a product release run, a technician reports peak tensile loads for five polymer coupons that are consistently 8% below the historical mean for the same formulation. The bench-top universal testing machine uses a 5 kN load cell whose calibration certificate expired three months ago.
588 words, about 3 min2Accuracy, Resolution, and Decision Rules on Incoming Inspection
A supplier's inspection certificate for machined bushings lists "accuracy: ±0.5 mm" and "resolution: 0.01 mm." The drawing calls for an outside diameter of 25.00 ± 0.30 mm. Incoming inspection uses a digital caliper with 0.01 mm resolution; ten repeat readings on a certified 25.000 mm gauge block give a mean of 25.04 mm and a range of 0.04 mm.
571 words, about 3 min3Holding-Time and Container Deviation in an Outfall Sample
A junior technician collects a grab sample from an industrial outfall for residual chlorine and sulfide. The method requires chlorine to be determined within 15 minutes and sulfide within 15 minutes, with samples kept in amber glass, headspace-free, and cooled to 4 °C.
548 words, about 3 min4Incompatible Storage and Hood Deficiency in a Metallography Lab
An internal audit of a small metallographic laboratory finds: a 2.5 L bottle of 68% nitric acid stored on an open shelf next to 1 L of acetone and a box of magnesium ribbon; the eyewash station is 18 m away in the corridor and its weekly activation log is missing for the last three weeks; the fume hood face velocity is 0.30 m/s with the sash at 45 cm, while the manufacturer specifies at least 0.5 m/s. Two technicians work in the room, and one reports headaches after using the hood.
575 words, about 3 min5Verifying a Coating Thickness Gauge Against a Certified Shim
A technician verifies an eddy-current coating thickness gauge using a certified shim of 50.0 µm with an expanded uncertainty of ±1.0 µm (k = 2). Ten readings give a mean of 52.3 µm and a standard deviation of 2.1 µm.
570 words, about 3 min