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Environmental Engineering Practice Test: Sedimentation and Chemical Clarification
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Avg score: 67% • Most missed: “In a fill and draw type sedimentation tank, a detention period of ____ hours is …”
Sedimentation and clarification are physical water treatment processes that use gravity or buoyancy to remove suspended solids from water. Sedimentation is a simple, low cost pre-treatment technology to reduce settable solids and some microbes from water. It also improves the visual qualities of the water and increases its acceptance by consumers. Chemically assisted sedimentation and clarification is a water treatment process that uses a chemical agent to help settle and coagulate suspended solids in water. The most common chemical agent used is alum (aluminum sulfate).   Topics... Show more
Environmental Engineering Practice Test: Sedimentation and Chemical Clarification
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25 Questions

1. In a rectangular horizontal flow tank, the maximum permissible velocity is ____ m/Sec.
2. The speed of impeller in a flash mixer is ___________
Figure: Flash mixer
3. When the impurities are separated by the gravitation of settling particles, the operation is called ______
4. ‘C’ in the following figure represents the ________
Figure: Flash mixer
5. Which of the following is the correct expression regarding temporal mean velocity in the following figure?
Figure: Flash mixer
6. Which of the following goes to the flocculation tank in the following figure?
Figure: Flash mixer
7. Which of the following represents the coagulant pipe in the following figure?
Figure: Flash mixer
8. How many types of sedimentation tanks are there on the basis of the method of operation?
9. In which type of sedimentation, the flocculent suspension of the intermediate concentration takes place?
10. _______ is formed when alum is added to sewage.
11. The average time required by water to pass through the settling tank is called _______
12. In which settling type, dilute suspension of particles takes place?
13. In which type of sedimentation, the flocculent suspension of high concentration takes place?
14. The detention period of a flash mixer is _________________
Figure: Flash mixer
15. In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?
16. The time period for which the water is stored in a sedimentation tank is called _____
17. In a rectangular horizontal flow tank, the maximum permissible velocity is ____ m/Sec.
18. The detention period for a sedimentation tank where coagulation takes place is ____________
19. Which of the following represents the device which is used for sludge removal in the following figure?
Figure: Flash mixer
20. Which of the following is correctly paired in the following figure?
Figure: Flash mixer
21. In which type of settling, sedimentation of discrete particles takes place?
22. Which of the following cannot be the velocity of flow in the horizontal flow sedimentation tank?
23. In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.
24. _________ is the average of velocities at a point over a definite period of time.
Figure: Flash mixer
25. Which of the following represents the impeller shaft in the following figure?
Figure: Flash mixer

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