In a sand mold, a sprue of height
\(h_2=200\ mm\) is to be provided for maintaining the molten metal flow rate of
\(10^6\ mm^3/s\). The height of liquid column above the point 2 is kept constant at
\(h_c=25\ mm\). The cross-sectional areas of the sprue at points 2 and 3 are
\(A_2\) and
\(A_3\), respectively. The points 1 and 3 are at the atmospheric pressure. Assuming the gauge pressure at point 2 to be zero as the limiting case to prevent aspiration effect, the ratio
\(\frac {A_3}{A_2}\) _____ . (Rounded off to 2 decimal places)
