Water Distribution Operator Class 3-Practice Test Questions With Correct Answers

0.08 ppm - Answer MCL for TTHM's 0.06 ppm - Answer MCL for HAA5's 0.01 ppm - Answer MCL for Arsenic 0.015 ppm - Answer MCL for Lead 90 days - Answer Turbidity meter must be calibrated every: Less than 0.3 for 95% of the time. - Answer MCL for turbidity is 2 buffers - Answer pH meters must be calibrated using Algae blooms - Answer A grassy of fishy taste in reservoir water indicates Improper backwashing of filters - Answer Mudballs are caused by Carbonate - Answer Lime can only be used to soften water with 0 ppm - Answer Water leaving Zeolite softener has a hardness of Schmutzdecke - Answer The top layer of a slow sand filter is called the Coagulation, flocculation, sedimentation - Answer A solids contact unit combines 4 ppm, 2 ppm - Answer The PMCL for fluoride is: The SMCL is: Warmer - Answer Flock will settle better in warm or cool water? High pH - Answer The greensand manganese removal process requires a: Volatile organic compounds & gases (odor) - Answer Aeration releases what from water? Amperomatic tiration - Answer The most accurate method of determining chlorine residual is: Sulfuric acid - Answer An alkalinity sample is titrated using Mixing and measuring - Answer A beaker is used for Nephelometric turbidity units - Answer NTU stands for: 5 years, 10 years - Answer Bacteria results must be kept for: Chem results for: Tubrbine, Propeller, Venturi, Nutating discs - Answer Four ways water meters operate are: Procedure, Part, Budget, Cost - Answer A preventative maintenance program includes: Lower insurance rates - Answer An advantage of a standpipe: Geographic Informaton System - Answer What is GIS? Cavitation (boiling) - Answer High flow rates in pumps can cause. Mechanical rakes, drag chain, traveling bridges - Answer Three ways sludge is removed from a settling basin are Inlet, Outlet, Settling, Sludge - Answer The 4 zones of settling basin are: Before - Answer Polyphosphates are injected before or after chlorination? Filter aid - Answer A nonionic polymer is usually used as a: Giardia, Legionella, Cryptosporidium - Answer Three "bugs" targeted by the SWTR are: Returned to plant head - Answer What should be done with backwash water? Taste, odor, chlorine, THM's - Answer Activated carbon is used to remove: Adsorption, oxidation, or aeratoin - Answer THM's can be removed by: Less - Answer Algae produces more or less oxygen at night as compared to day? 99.99% - Answer A LOG removal of 4 is a removal of what percent? Removes color, taste, odor - Answer One outstanding advantage to ozone is: Monochloromines, Dichloramines, Trichlorimaines - Answer Three forms of combined chlorine residual are: THM's - Answer TOC's are precursor in the formation of: Deliver very accurate volumes - Answer A pipet is used to Bug in a dormant state - Answer What is a spore? Straight edge, feeler gauge - Answer List some tools used to align a coupling between a motor and a pump. Differential pressure - Answer Rate of flow controllers work on Head pressure at various points - Answer What is hydraulic grade line? tall buildings - Answer An RPZ backflow preventor is used for 90% - Answer Electric motors in a water plant accounts for what percent of the total electrical use?