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Environmental Engineering Practice Test: Properties of Disinfection
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Avg score: 77% • Most missed: “The normal dose of chlorine during break point chlorination is ____________”

Disinfectants are chemical agents that are designed to destroy or inactivate microorganisms. For example, Chlorinated disinfectants are often used in hospitals, quarantine facilities, and other public areas to fight the spread of viruses.
Topics include: Methods of Disinfection, Chlorination, Forms of Chlorination, Factors Affecting Chlorination, Kinetics of Chemical Disinfection, & Iodine, Bromine and Ozone Treatment.

 

Environmental Engineering Practice Test: Properties of Disinfection
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25 Questions

1. The normal dose of chlorine during break point chlorination is ____________
2. The dimensional formula of rate constant used in Chicks law is ____________
3. Which of the following is wrong regarding disinfection?
4. Which type of chloramine is formed when pH of water is 4.4?
5. The chlorine, which serves as a disinfectant is ___________
6. Which of the following regarding break point chlorination is wrong?
7. The normal dose of chlorine during plain chlorination is ___________
8. The presence of metallic compounds in water _______ the efficiency of chlorine.
9. What happens during the breakdown of ozone?
10. What happens to the hypoiodous acid when the pH is over 8?
11. __________ is the application of chlorine at two or more points in the purification process.
12. Which minor method of disinfection is effective in complete sterilization of water?
13. The number of organisms in disinfection process can be expressed by ____________
14. When the coefficient of dilution is 1, then which of the following statement is correct?
15. The hypochlorous acid is ______ times effective as hypochorite ions.
16. When the pH is between 5 and 10, the chlorine in the water acts as ______
17. a HIO + b OH- <=> HIO3 + b H2O + b I–. What are the values of a and b respectively in the above equation?
18. What is the chemical formula of bleaching powder?
19. When turbidity in water increases, the efficiency of chlorine?
20. Chlorine which gets consumed in the oxidation of impurities before disinfection is ______________
21. The dosage of ozone for municipal water treatment is __________
22. The number of organisms destroyed is equal to the number of organisms remaining at time t = __________
23. The pathogenic bacteria do not last long at a pH ______
24. The chemical formula of hypoiodous acid is __________
25. _______ is the application of chlorine beyond the stage of the break point.

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