Water Distribution Course Exam Questions and Answers 100% Correct!

The minimum residual water pressure required by the Rules and Regulations for Public Water Systems (30 TAC Chapter 290 subchapter D) is _____. a. 40 psi at all times b. 20 psi under peak demand conditions c. 200 gallons per day 35 psi under peak demand conditions - ANSWER-b. 20 psi under peak demand conditions Dead end mains should be flushed every _____. a. day b. week c. month d. 4th of July - ANSWER-c. month Water hardness is caused by _____. a. suspended solids b. improper treatment c. too much chlorine d. calcium and magnesium salts - ANSWER-d. calcium and magnesium salts Transpiration is _____. a. the release of water vapor into the air by plants b. breathing c. dying d. moving water from one place to another - ANSWER-a. the release of water vapor into the air by plants The presence of nitrates in water can cause _____. a. typhoid b. cancer c. blue babies d. none listed - ANSWER-c. blue babies The federal agency that provides standards for the maximum allowable concentration of inorganic chemicals in potable water is _____. a. the Texas Department of Health b. the Environmental Protection Agency c. the Texas Commission on Environmental Quality d. the Texas Department of Water Resources - ANSWER-b. the Environmental Protection Agency