Water Distribution - Additional Sample Questions and Answers with Certified Solutions

Water Distribution - Additional Sample Questions and Answers with Certified Solutions A 6-in. pipeline needs to be flushed. If the desired length of pipeline to be flushed is 316 ft, how many minutes will it take to flush the line at 31 gpm? a. 10 minutes b. 15 minutes c. 30 minutes d. 60 minutes Answer: b. 15 minutes What is the area of a trench that is 22.4 ft long and 3.3 ft wide? a. 26 sq ft b. 74 sq ft c. 143 sq ft d. 187 sq ft Answer: b. 74 sq ft Which of the following is typically associated with trihalomethanes? a. High levels of carbon dioxide in a surface water source b. Surface water high in inorganics c. Water with organics that has been chlorinated d. Groundwater of surface water high in inorganics Answer: c. Water with organics that has been chlorinated Which of the following mandates the language and methods for public notification? a. American Water Works Association b. National Rural Water Association c. US Environmental Protection Agency d. California State University Answer: c. US Environmental Protection Agency What is the primary source of lead in drinking water? a. Lakes b. Rivers near lead mines c. Corrosion of plumbing systems d. Groundwater Answer: c. Corrosion of plumbing systems Interior copper tubing is usually joined by a. Solder b. Flare c. Compression d. Union Answer: a. Solder Fire demand can account for what percent of the total capacity of a storage system? a. 20% b. 30% c. 40% d. 50% Answer: d. 50% Which type of piping is most resistant to corrosion? a. Plastic pipe b. Stainless steel c. Concrete d. Asbestos-cement Answer: a. Plastic pipe Which of the following metals makes the best anode? a. Brass b. Cast iron c. Zinc d. Copper Answer: c. Zinc What is the minimum contact time when using the chlorine tablet method of disinfection? a. 6 hours b. 12 hours c. 18 hours d. 24 hours Answer: d. 24 hours Piping containing reclaimed water should be painted what colour? a. Orange b. Yellow c. Purple d. Red Answer: c. Purple What is the pounds per square inch pressure at the bottom of a tank a. 7.3 psi b. 16.6 psi c. 53.9 psi d. 88.4 psi Answer: b. 16.6 psi