Water Distribution Questions Already Passed

What has been the primary use of ozone in the U.S {Ans: Taste and odor control}Which substances react with chlorine and reduce its disinfection ability {Ans: Ammonia, Hydrogen sulfide, organic materials}What problems might result from hydrant testing and flushing programs {Ans: dirty water reaching consumers}How are high water pump discharge pressures in well applications overcome when applying chlorine {Ans: use a chlorine booster pump}What are two causes of backflow through a cross connection {Ans: Backsiphonage or back pressure}Why has there been an increased interest in disinfectants other than chlorine {Ans: Because of the carcinogenic compounds that chlorine may form}What is the probable cause of an increase in coliform level in a water distribution system {Ans: Low chlorine residual}Why is sodium chlorite considered a hazardous chemical {Ans: combustible around organic material}What disinfectants are used to disinfect water that is delivered to consumers through the distribution system {Ans: Free chlorine, iodine, monochloramine}What happens when chlorine comes in contact with skin {Ans: blistering}In water distribution systems, what is the primary concern when entering a confined space {Ans: Oxygen deficiency}High water temperatures can cause what problems to system water quality {Ans: tend