engineering recuitment KPSC Assistant Engineer Civil Mock Test 2020 Environmental Engineering Water Treatment Filtration
The following are certain operating problems of a rapid sand filter:
1. Sand depth should never be depleted by more than 10 cm.
2. Air binding results due to development of negative head and formation of air bubbles in the filter sand.
3. Water softening with lime-soda leads to incrustation of sand.
4. Bumping of filter bed is caused due to negative head.
Which of the above statements are correct?1
1, 2 and 4 only
2
1, 2 and 3 only
3
3 and 4 only
4
1, 2, 3 and 4