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1. Sedimentation is the process of letting materials:
   
   a. Float b. Suspend c. Settle d. None of the above
    

2. Sedimentation is accomplished by:
   
   a. Increasing water velocity b. Decreasing water velocity c. Keeping water velocity the same d. Velocity has no relevance to sedimentation
    

3. Factors that affect sedimentation are:
   
   a. Particle size b. Particle density c. Keeping water velocity the same. d. Velocity has no relevance to sedimentation
    

4. All particles have a slight electrical charge
   
   a. True b. False
    

5. When water temperature decreases
   
   a. Settling increases b. Settling decreases c. Detention time must be decreased d. None of the above
    

6. What can be done to eliminate short circuiting of a tank
   
   a. Increase water velocity b. Install baffles c. All of the above d. None of the above
    

7. Sedimentation tanks are divided into three zones they are
   
   a. Outlet zone, inlet zone, sludge zone b. Solids zone, sludge zone, outlet zone c. Ozone, inlet zone, sludge zone d. None of the above
    

8. Currents in a sedimentation tank can be beneficial in a sedimentation tank?
   
   a. True b. False
    

9. High velocities near the bottom of a sedimentation tank can
   
   a. Assist settling b. Contribute to carry over of settled material c. Has no effect on tank d. All of the above
    

10. A weir
    
    a. Controls the flow in a sedimentation tank b. Prevent solids from rising c. Controls depth of water d. Controls overflow rate e. All of the above
     

11. Sedimentation basins are commonly called clarifiers
    
    a. True b. False
     

12. Sedimentation basins are almost always constructed in a circular shape
    
    a. True b. False
     

13. A solids contact unit combines
    
    a. Coagulation, flocculation, sedimentation b. Sedimentation, flocculation, recarbination c. Recarbination, coagulation, sedimentation d. None of the above
     

14. Flow direction in a solids contact unit is usually downward similar to a clarifier

    a. True b. False
    
    
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