Discussion
Arrange these tests in the order they would sensibly be run on a consignment of clay arriving at a works.
1. Chemical and mineralogical analysis
2. Visual inspection and sampling
3. Firing trial to check colour and shrinkage
4. Moisture content by drying
Answer: A
Correct answer: 2 - 4 - 1 - 3
Cheapest and quickest first, and each step gates the next. Visual inspection with sampling catches gross faults immediately and provides the material for everything after it. Moisture is measured next because it is needed to express every other result on a dry basis. Chemical and mineralogical analysis follows, and the firing trial - the slowest and most expensive test - comes last, on material that has already passed the others.
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