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Cores used in PMC are usually made up of?

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in Casting-Forming-Welding I by (687k points)
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

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Best answer
Right choice is (d) All of the mentioned

The explanation: In PMC the cores can be made out of any of these materials.

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