AWWA Water Distribution Intro Exam 2024

AWWA Water Distribution Intro Exam 2024 calcium and magnesium - ANSWER Which of the following elements cause hardness in water? drawdown. - ANSWER The difference between static level and pumping level in a well is called: high nitrate content - ANSWER An illness known as methemoglobinemia (blue baby syndrome) is attributed to: consumers tap - ANSWER Drinking water regulations require sampling for bacteriological analysis at the upper surface of the ground water - ANSWER The water table refers to a dense white vapor - ANSWER In detecting chlorine gas leaks from the disinfection assembly, an ammonia soaked rag will produce increase in organic matter - ANSWER Which of the following increase chlorine demand? 0.2 lbs. of chlorine per 1,000,000 lbs. of water - ANSWER A chlorine residual of 0.2 mg/l is the same as presence or absence of coliforms in a sample. - ANSWER The Total Coliform Rule is based first on average annual air temperature - ANSWER The proper concentration for fluoride in drinking water is determined by: 4.0 mg/l - ANSWER The maximum contaminant level (MCL) for fluoride in drinking water is: neutral - ANSWER A pH of 7 indicates that the sample is increase in organic matter - ANSWER Which of the following conditions would increase turbidity 10 mg/l - ANSWER The MCL for nitrate as N at the point of withdrawal is 100-150 gpd - ANSWER The average amount of water used per person per day is pathogens - ANSWER Disease producing organisms are called killing disease producing organisms - ANSWER Disinfection involves quarterly - ANSWER If volatile organic chemicals (VOCs) are detected, sampling must then be conducted typhoid fever, dysentery, and cholera - ANSWER Three waterborne diseases are one part per million - ANSWER One milligram per liter (mg/l) is equal to: 4 times - ANSWER Under like conditions, how much more water would an 8-inch pipe carry than a 4-inch pipe? it is flammable - ANSWER Which of the following is not true about chlorine gas? 40 lbs. - ANSWER What is the maximum amount of chlorine gas that can be removed from a 150-lb. cylinder in 24 hrs? hypochlorite - ANSWER Chlorine in a dry form is called impeller - ANSWER The rotating part of centrifugal pump is called the smells like rotten eggs - ANSWER Hydrogen sulfide gas apply 50 mg/l chlorine for 24 hours - ANSWER To properly disinfect a water main after new construction, you should pouring a solution of muriatic acid into the well and surging - ANSWER Well screens that are partially blocked with scale deposits can be most easily cleaned by algae - ANSWER Tastes and odors in surface water are most often caused by As temperature goes down, dissolved oxygen goes up - ANSWER What effect does temperature have on oxygen solubility? check valves have to be pushed open energy is required to get the water moving the motor and pump have to start turning - ANSWER Pump motors draw more power starting than during normal operating conditions because keep wear concentrated on economically replaceable part - ANSWER Wear rings are installed in a pump to be opened all of the way - ANSWER When using a fire hydrant, the valv aeration - ANSWER One of the most effective ways to remove hydrogen sulfide from water is by keep the hydrant from freezing - ANSWER The primary reason for dry barrel fire hydrants is to water hammer - ANSWER The sudden closure of a check valve will result in aeration and filtration - ANSWER Which of the following is an effective way for removing iron from water? in an unlocked cabinet outside the chlorinator room - ANSWER Where is the best place to store a self contained breathing apparatus (SCBA)