Cores used in PMC are usually made up of?
A. Metal
B. Collapsable material
C. Sand
D. All of the mentioned
I have been asked this question in unit test.
My query is from Special Casting Techniques in section Special Casting Techniques of Casting-Forming-Welding I
Right choice is D. All of the mentioned
The explanation: In PMC the cores can be made out of any of these materials.