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Environmental Engineering Practice Test: Filtration
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Avg score: 82% • Most missed: “The effective size of a pressure sand filter is ______”
In environmental engineering, filtration is the process of removing particles from water. This process involves a number of mechanisms, including: Straining, Flocculation, Sedimentation, Surface capture. Filtration involves using a filter medium to separate solid particles from a liquid or gaseous mixture. The filter allows the fluid to pass through but holds the solid particles.   Topics include: Theory and classification of Filtration, Filter Media, Slow Sand Filter, Rapid Sand Filter, Problems in Filter Operation, Comparison Between Slow and Rapid Sand Filter, Filtration Hydraulics,... Show more
Environmental Engineering Practice Test: Filtration
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25 Questions

1. The turbidity of water applied to rapid sand filter is less than _______
2. In which action of filtration, removal of particulate matter takes place?
3. The minimum number of filter beds in the slow sand filter is __________
4. The effective size of a pressure sand filter is ______
5. Consider the following statement.

i. Slow sand filter is not flexible in variation in demand

ii. The rapid sand filter is flexible in fluctuations in demand

iii. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
6. The cracking of bed is more prominent __________
7. The thickness of the base material of a rapid sand filter on which filter media are supported is __________
8. The finer the suspended impurities to be removed ___________
9. Which of the following is the expression of the Carmen equation where symbols have their usual meanings?
10. _______ type of trouble in filter is caused by the released of dissolved air and gases from water.
11. Which type of problem is caused in filter due to the accumulation of solids on the top surface of filter media?
12. What is the value of uniformity coefficient in a pressure sand filter?
13. Which of the following statement is wrong regarding filtration?
14. Rapid sand filters are very efficient in removal of color.
15. The thickness of the base material on which filter media are supported is __________
16. ______ are formed in filters due to insufficient washing of sand grains.
17. What is the frequency of cleaning of a slow sand filter?
18. The value of Reynolds number R is 1.5. The coefficient of drag is?
19. The filter run in rapid sand filter should not be less than _____ hours.
20. The thickness of sand bed of a pressure filter is _____ cm.
21. Which of the following is the expression of the Rose equation where symbols have their usual meanings?
22. Schmutzdecke acts as an extremely fine meshed straining mat.
23. Consider the following statements regarding sand as filter material.

i. It should be free from clay or silt

ii. Organic matter should be present in the sand

iii. It should be nonuniform
Which of the above statement is/are correct?
24. What is the specific gravity of Anthracite used in a dual media filter?
25. The slow sand filter is able to remove ______ % of bacteria in water.

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