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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 filled 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 tA and tB is
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- tB = √2tA
- tB = 2tA
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tB = tA √2
- tB = 2√2tA
- tB = √2tA
Correct Option: B
| Top gate tf1 = | ||
| Ag √( 2ghm ) |
hm = H
| tf1 = | .....(1) | |
| Ag √2g |
| Bottom gate tf2 = | ( √hm - √hm - H ) | |
| Ag √2g |
| tf2 = | √hm .....(2) | |
| Ag √2g |
| = 2 | ||
| tf1 |
tf2 = 2tf1
