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What is the advantage of having a low bulk density of a sand-mix?(a) Higher strength(b) Good refractoriness(c) Higher flow ability(d) Higher permeability |
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Answer» Right option is (d) Higher permeability To explain: Low bulk density of sand mix results in equal size of grains with smooth round shape, this further results in increase in volume of voids due to less bulk density and hence a higher permeability which permits an easy outflow of the gases from the molten metal. |
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