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				| 1. | When will the particles settle in a tank which is subjected to countercurrent settling? | 
| A. | tV<(V<sub> </sub> V sin )/v cos | 
| B. | tV>= V<sub> </sub>/v cos | 
| C. | tV>= (V<sub> </sub> V sin )/v cos | 
| D. | tV<V<sub> </sub>/v cos | 
| Answer» D. tV<V<sub> </sub>/v cos | |