The primary function of a riser is to

1.	The primary function of a riser is to
A.	feed molten metal to casting as it solidifies
B.	prevent atmospheric air from contaminating the metal in the mould
C.	allow gases to easily escape from mould cavity
D.	allow molten metal to rise above the mould cavity
Answer» D. allow molten metal to rise above the mould cavity

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The primary function of a riser is to

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