The optimum shape of a riser is spherical to ensure that it cools more slowly than the casting it… 1 answer below »

The optimum
shape of a riser is spherical to ensure that it cools more slowly than the
casting it feeds. However, spherically shaped risers are difficult to cast. (a)
Sketch the shape of a blind riser that is easy to mold, but also has the
smallest possible surface-area-to-volume ratio.

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