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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 | |