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1. In the United States, there are more miles of what type of pipe used in a water distribution system.
   
   a. Ductile iron b. Asbestos cement c. Cast iron d. Steel pipe
    

2. The use of lead joints is now prohibited.
   
   a. True b. False
    

3. Using cast iron pipe, which joint has become the most used in the last 40 years?
   
   a. Mechanical b. Bell c. Spigot
    

4. Ductile iron pipe was introduced in the 1950s to replace what type of pipe?
   
   a. Asbestos cement b. Cast iron c. Steel d. Plastic
    

5. All new mains must be pressure tested and disinfected.
   
   a. True b. False
    

6. All new mains are allowed leakage.
   
   a. True b. False
    

7. Coliform water samples are taken before a new water main can be put into service.
   
   a. True b. False
    

8. How many negative coliform samples are required to pass a new water main?
   
   a. One b. Two c. Three d. Four
    

9. What type of valve is most commonly used in a distribution system?
   
   a. Butterfly b. Globe c. Gate
    

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