# GATE Mechanical 2014 Set 3 | Question: 52

A cylindrical blind riser with diameter d and height h , is placed on the top of the mold cavity of a closed type san d mold as shown in the figure. If the riser is of constant volume, then the rate of solidification in the riser is the least when the ratio h:d is

1. $1:2$
2. $2:1$
3. $1:4$
4. $4:1$

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