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Environmental Engineering Practice Test: Unit Operations, Screening and Aeration
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In environmental engineering, screening and aeration are unit operations that remove large floating matter and add dissolved oxygen to water.  Screens remove large floating matter from raw water, such as debris, fish, vegetation, and garbage. Screens with smaller openings can screen more material. Aeration is the process of bringing water and air into close contact to remove dissolved gases and oxidize dissolved metals. Aeration can also remove volatile organic chemicals (VOC) in the water. Aeration is also an effective method of bacteria control. It can be used to oxidize soluble iron and... Show more
Environmental Engineering Practice Test: Unit Operations, Screening and Aeration
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23 Questions

1. Which form of solute stabilization occurs when water passes through limestone?
2. In which type of aerator, the flow of water is divided into fine streams and small droplets?
3. In which unit operation objectionable solutes are converted into unobjectionable forms without removal?
4. Micro strainers are used to remove color in water.
5. How many types of aerators are commonly used in the treatment of water?
6. The shape factor for circular rods in finding the head loss through the screen is _____
7. The coarse screen is inclined at _____ to facilitate the cleaning or raking.
8. The reduction of carbon dioxide by cascade aerators is in the range of __________
9. In which form of solute stabilization, hydrogen sulfide in water is oxidized into sulfate?
10. The head loss through screen depends on _______________
11. Identify the incorrect statement regarding aeration process.
12. Which form of solute stabilization occurs when water passes through limestone?
13. In which unit operation, gases are released or absorbed in the water?
14. Identify the incorrect statement regarding aeration process.
15. Which process of water treatment is done to avoid floating debris, branches, trees or other large particles suspended in water?
16. The elapsed time in gravity filter is 1sec. What is the height of fall in a single descent?
17. The reduction of carbon dioxide by cascade aerators is in the range of __________
18. Which of the following process is used to remove the colloidal particles from water?
19. The coarse screen is inclined at _____ to facilitate the cleaning or raking.
20. In which type of aerator, the flow of water is divided into fine streams and small droplets?
21. How many types of aerators are commonly used in the treatment of water?
22. The elapsed time in gravity filter is 1sec. What is the height of fall in a single descent?
23. In which form of solute stabilization, hydrogen sulfide in water is oxidized into sulfate?

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