The primary purpose of sprue in casting mould is to

help feed the casting until all solidification takes place

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feed the casting at rate consistent with the rat of solidification

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Act as a reservoir for molten metal

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feed molten metal from the pouring basin to the gate

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Solution

The correct option is D feed molten metal from the pouring basin to the gate
Sprue is a tapered connecting passage between pouring basin and runner for molten metal.

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