Water Distribution Test 2 exam 2023 with 100% correct answers

What does a C value of 140 means for a pipe? The pipe interior is very smooth. Which primary contaminant causes Blue Baby Syndrome? Nitrate. What is a nutating disc? Type of a water meter for a small-diameter domestic service. What causes hardness in water? Magnesium and calcium. Which of the following is a confined aquifer with groundwater under positive pressure? Artesian. ____________ is an imaginary surface to which groundwater rises inder hydrostatic pressure in wells. Piezometric surface. If chlorine was added to water, but there is no chlorine residual, which statment is true? Chlorine demand has not been met. What is true about chlorine gas? Chlorine has is 2.5 times heavier then air. When is a ladder required in a trench? When the trench is 4 feet or deeper? What is the definition of diurnal pattern? Daily pattern of water demand. What is formed when free chlorine reacts with organic matter? Trihalomethane What could happen if a valve is closed too rapidly? Water hammer. Which of the following best describe Tier 1 of the Public Notification Rule? A violation that poses an immediate threat to human health. The public must be notify within 24 hours. What is the typical concentration (strength) of bulk sodium hypochlorite solution for desinfecting a water supply 12.5%