Matching each casting process with its description.
1. Investment casting uses a wax pattern which is covered in a ceramic material to form molds, hence iii is correct.
2. Cold chamber die casting is used for metals with high melting points that could damage the casting equipment, so iv is correct.
3. Centrifugal casting involves pouring molten metal into a rotating mold, making i the right choice.
4. Hot chamber die casting is typically used for metals with a low melting point, which allows for the metal to be maintained in a liquid state within the machine, thus ii is correct.