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freezing ration of the mould

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asked in production by (215k points)
A cast steel slab of dimension 30x20x5 cm is poured horizontally using a side riser. The riser is cylindrical in shape with diameter and height, both equal to D. the freezing ration of the mould is

(a) 8D / 75            (b) 4D / 75                (c) 75 / 8D                (d) 75 / 4D

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