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If a web of internal passageways and chambers is to be constructed which of the following element is most obsolete for use?

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in Casting-Forming-Welding I by (687k points)
If a web of internal passageways and chambers is to be constructed which of the following element is most obsolete for use?

(a) Cores

(b) Core prints

(c) Core boxes

(d) Chaplets

This question was addressed to me in homework.

This interesting question is from Different Functions of Core topic in portion Core and Core Making of Casting-Forming-Welding I

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Best answer
The correct option is (a) Cores

The explanation: Core has a variety of uses. For the making of long passageways in a casting core a best suitable and cheap.

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