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Environmental Engineering Practice Test: Sedimentation
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Sedimentation is a process that removes impurities from suspended particles in water using gravity. It occurs when the particles are heavier than the water. Sedimentation is a low-cost pre-treatment technology that removes settable solids and some microbes from water. It also improves the visual quality of the water and increases its acceptance by consumers.

Topics include: Theory of Sedimentation, Design Elements of Sedimentation, Sedimentation with Coagulation, & Flocculation and Clarification.

Environmental Engineering Practice Test: Sedimentation
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25 Questions

1. In which type of sedimentation, flocculent suspension of high concentration takes place?
2. The detention period of a rectangular tank is given by _______
3. The pulsator clarifier is a type of __________
4. Which of the following statement is wrong regarding Iron salt?
5. In which type of settling, sedimentation of discrete particles takes place?
6. Settling tank efficiency is reduced by _______

i. Eddy current

ii. Surface current

iii. Density current
7. Ferric chloride is effective over a pH range of __________
8. In which device, the primary mixing is followed by a secondary reaction zone resulting in formation of sludge blanket?
9. What will be the surface area of the basin for a flow of 2*106 litre per day having a surface loading rate 10,000 litre/day/m2?
10. The detention period of the vertical flow clarifier is _______
11. The quantity of water flowing per hour per unit horizontal area is called ________
12. In which type of sedimentation, flocculent suspension of intermediate concentration takes place?
13. Settling velocity of a spherical body in a viscous fluid is given by ___________
14. Which device solved the problem of unstable hydraulic conditions and operation of sludge removal equipment?
15. The average time required by water to pass through the settling tank is called _______
16. Alum is effective when pH of water is between ____
17. Detention time for a circular tank is given by _______
18. Why Magnesium carbonate is not commonly preferred as coagulant?
19. What is the normal value of the detention period adopted in a flocculator for design purpose?
20. When impurities are separated by the gravitation of settling particles, the operation is called _____
21. The rate of change of velocity per unit distance normal to a section is called_______
22. __________ is an operation designed to force agitation in the fluid and induce coagulation.
23. Range of Displacement efficiency in the plain sedimentation tank is ___________
24. In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.
25. 1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m2.

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