Question

A cylinder of diameter 150 mm and length 300 mm is to be cast without any riser. The cylinder is moulded entirely in the drag of a green sand flask and it top gated. The cope of flask is 200 mm height and the height of the metal during pouring is 50 mm above the cope. A tapered sprue is employed and the gating ratio is 1:2:2. The flow rate of molten metal in mm${}^3$/sec, if cross sectional area of bottom of sprue is 200 mm${}^2$

• A. $4.4\times {10}^5$
• B. $4.4\times {10}^4$
• C. $1.4\times {10}^4$
• D. None

Answer 1

The correct option is A $4.4\times {10}^5$


$Q=A_{min}\times V_{max}=A_c\times \sqrt{2g{h}_t}=200\times \sqrt{2\times 9810\times 250}=4.4\times {10}^{5}m{m}^3/S$