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Environmental Engineering Practice Test: Filtration
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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 maximum daily demand of a city is 24*105 and the rate of filtration is 100 per litre per hour per m2. What is the area of the filter?
2. In which action of filtration, particles coarser than the void size is arrested?
3. The tendency of jetting can be minimized by __________
4. When the loss of the head exceeds the static head, the head becomes _____
5. The area of the filter is 1500. What is the number of beds to be provided?
6. The coarser layer used in a dual media filter is of __________
7. ______ are formed in filters due to insufficient washing of sand grains.
8. Which of the following statement is wrong regarding filtration?
9. The thickness of the base material on which filter media are supported is __________
10. Which type of filter is used in treating swimming pool water?
11. In which of the following filter, water is passed under higher pressure?
12. What is the value of the uniformity coefficient in a rapid sand filter?
13. Rapid sand filters are very efficient in removal of color.
14. When the fineness of sand increases __________
15. The filtration rate of a slow sand filter is _____ litres of water per square metre.
16. In which type of filtration problem, layers of gravel are displaced?
17. Consider the following statement regarding the depth of sand of the rapid gravity filter?

i. It should be checked against breakage of floc

ii. The sand depth should lie between 100-200cm

iii. The floc should be attached through the sand bed
Which of the above statement is/are correct?
18. In which type of under drainage system of rapid sand filter, laterals are provided with strainers?
19. What is the effective size of Anthracite when used as a filter material?
20. Carmen-Kozney equation has been derived using which of the following equation?
21. In which action of filtration, colloidal particles are removed?
22. Which of the following is correct regarding the cheapest filter material used in water treatment?
23. Consider the following statement.

i. The penetration of suspended matter is deep in the slow sand filter

ii. The penetration of suspended matter is superficial in the rapid sand filter

iii. Coagulation is not required in the slow sand filter
Which of the above statement is/are correct?
24. What is the maximum filter head up to which slow sand filters are worked upon?
25. In which action of filtration, removal of particulate matter takes place?

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