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Which of the following statement is true? (a)Cores are permanent

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in Casting-Forming-Welding I by (687k points)
Which of the following statement is true?

(a) Cores are permanent

(b) Cores are semi-permanent

(c) Cores are permanent & semi-permanent

(d) Cores are not permanent

The question was posed to me in an online interview.

The origin of the question is Different Functions of Core in division Core and Core Making of Casting-Forming-Welding I

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The correct answer is (c) Cores are permanent & semi-permanent

For explanation I would say: Cores can be permanent and sometimes they can also be semi-permanent and are destroyed in order to remove the casting from mold.

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