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What consequence results when solidification shrinkage in investment casting restricts the gating system?

A)Increased porosity in the casting
B)Improved surface finish locally
C)Enhanced directional grain growth
D)Reduced heat transfer coefficient

💡 Explanation

Increased porosity arises because volumetric contraction during solidification leads to voids, due to obstructed feeding of molten metal affected by the _directional solidification_ mechanism; therefore porosity increases rather than decreases, because gating blockage inhibits complete filling of the cavity.

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