Multiple choice

In a sand casting operation, the total liquid head is maintained constant such that it is equal to the mould height. The time taken to fill the mould with a top gate is tA. If the same mould is filed with a bottom gate, then the time taken is tB. Ignore the time required to fill the runner and frictional effects. Assume atmospheric pressure at the top molten metal surfaces. The relation between and tA tB is

  1. tB = $\sqrt{2}$tA

  2. tB = 2 tA
  3. tB = $\frac{t_A}{\sqrt{2}}$tA
  4. tB = 2$\sqrt{2}$tA
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B Correct answer
Explanation

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