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Which of the following is not included in scrap used for melting?

(a) Risers

(b) Billets

(c) Defective castings

(d) Gates

The question was asked by my college director while I was bunking the class.

I want to ask this question from Sections in the Foundry in portion Pattern Materials & Moulding Sand Tests of Foundry and Forging

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Right option is (b) Billets

The explanation is: All of the above mentioned types of materials are scraps from the earlier used materials except for billets. A billet is a form of cylindrical shaped raw materials which is melted and solidified to get to that shape after purification. Billets are externally prepared for ease of transportation and are not a scrap.

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