1.

A cylindrical blind riser with diameter d and height h, is placed on the top of the mould cavity of a closed type sand mould 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

A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1
Answer» B. 2 : 1


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