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Consider the following statements about plastic forming.
1. De-airing reduces laminations in extruded products.
2. Plasticity in clay bodies depends on plate-like particles and water.
3. Extrusion can produce shapes that vary along their length.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two are correct. The third is precisely what extrusion cannot do, since the die imposes one cross section on the whole length of the product. A varying section requires pressing, casting or machining instead.

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