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A riser permits the escape of the air and mold gases.

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in Foundry and Forging by (110k points)
A riser permits the escape of the air and mold gases.

(a) True

(b) False

I have been asked this question in an online quiz.

The doubt is from Principles of Gating and Risering topic in division Concept of Gating and Risering of Foundry and Forging

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Correct option is (a) True

Explanation: Risers promote single directional solidification. When it is full it indicates that the mould cavity is full. A riser permits the escape of air and mold gases as the cavity is being filled with the molten metal.

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