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1. Corrosion can:
   
   a. Deteriorate pipe b. Reduce pipe life c. Corrode internally d. Corrode externally e. Reduce pipe carrying capacity f. All of the above
    

2. Ductile iron and cast iron pipes are both considered brittle distribution piping?
   
   a. True b. False
    

3. Linings are used in pipe to:
   
   a. Strengthen pipe b. Increase friction c. Help prevent corrosion d. All of the above
    

4. Lead and Copper piping are still common materials used today in water distribution?
   
   a. True b. False
    

5. Pipe corrosion will cause
   
   a. A pipe to fail b. Wall thickness to be reduced c. Potential for heavy metals to be carried in the pipe flow d. All of the above
    

6. Soil resistivity is a measurement of the potential of external corrosion on a pipe?
   
   a. True b. False
    

7. Soil resistivity measurement
   
   a. Help with determining pipe material selection b. Determine potential for external corrosion c. All of the above d. None of the above
    

8. Low soil resistivity can mean the soil could be aggressive
   
   a. True b. False
    

9. Ductile iron pipe constructed in soil with low resistivity should
   
   a. Not be considered b. Should be wrapped c. Can be installed with no concern
    

10. Protecting pipe from external corrosion includes:
    
    a. Wrapping b. Cathotic protection c. Pipe replacement with different materials d. All of the above e. None of the above
     

11. Plastic Pipe is resistant to corrosion?
    
    a. True b. False
     

12. Properties that affect internal pipe corrosion include:
    
    a. Velocity, temperature, dissolved oxygen, chlorine residual, chloride ions b. Velocity, water conductivity, chloramines c. Pipe conductivity, water conductivity, dissolved oxygen d. None of the above
     

13. Increases in dissolved oxygen will decrease corrosion in most metals?
    
    a. True b. False
     

14. Increases in water temperature in most cases will increase metal corrosion?
    
    a. True b. False
     

15. Critical Velocity in a water pipe is considered to be
    
    a. 2 ft per sec b. 3 ft per sec c. 4 ft per sec d. 4.5 ft per sec
     

16. Pipe erosion is characterized by
    
    a. Failing elbows and tees b. Waves in the pipe walls c. Grooves d. Gullies e. All of the above
     

17. Pipe erosion, and corrosion, a virtually the same thing?
    
    a. True b. False
     

18. The most important factors influencing copper corrosion are:
    
    a. Pipe age, amount of bends in the pipe, size of pipe b. Dissolved oxygen, pipe size, pH c. pH, dissolved oxygen, pipe age, water temperature d. Dissolved oxygen, water temperature, size of pipe e. None of the above
     

19. Green water or green plumbing fixtures are an indication of copper corrosion?
    
    a. True b. False
     

20. Pitting of copper pipe is an indication of hard water?
    
    a. True b. False
     

21. Lead plumbing and lead pipe solder are no longer acceptable materials in Minnesota?
    
    a. True b. False
    
     

22. The critical ph level considered in lead corrosion is
    
    a. 7 b. 8 c. 9 d. 10
     

23. Microorganisms can contribute to corrosion in a water system?
    
    a. True b. False
     

24. The Langelier index is a way to measure
    
    a. The coating ability of water b. The aggressiveness of water c. All of the above d. None of the above
     

25. Preventing corrosion includes:
    
    a. pH adjustment b. Chemical inhibitors c. Electrochemical measures d. All of the above e. None of the above
     

26. Phosphate addition prevents corrosion by laying down a film on the inside of a pipe and preventing contact of an aggressive water with the pipe?
    
    a. True b. False
     

27. Waters with a high alkalinity and a ph above 8 can
    
    a. Cause corrosion b. Plug pipes over time c. Have no affect on pipe d. None of the above
     

28. Common chemical inhibitors used in corrosion control practices include
    
    a. Polyphosphates b. Orthophosphates c. Silicates d. Ortho-poly blends e. All of the above e. None of the above
     

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