Class D Basic Water Practice Test Questions & Answers

A trench 24in wide 800ft long and 4ft deep is to be excavated. The amount of soil excavated is? - ANSWERS6400ft An elevated storage tank had pipe 150 feet above ground when full water pressure at the bottom psi should be? - ANSWERS65 Chlorine dosage for water is 2.7mg/l if chlorine residual after 30 minutes is 0.8mg/l. What is demand expressed in mg/l? - ANSWERS1.9 Water is pumped 250 gallons a min. How long to fill 100,000 gallon tank? - ANSWERS6.6 A free chlorine residual of 0.6mg/l is desired how many mg/l of chlorine will be needed when chlorine demand of water is 2.2mn/l? - ANSWERS1.6 A chlorine dosage of 2mg/l is to be added to 600,000 gallons of water how many pounds of chlorine 100% are needed to obtain this concentration? - ANSWERS10 The hydrologic cycle is? - ANSWERSRecycling of water between the earth & atmosphere Basic water PH reading is? - ANSWERS8.5 A chemical of water impacting scaling is? - ANSWERSCalcium What is Raw water? - ANSWERSUntreated water Regulated chemical compound formed when disinfectants react with naturally occurring organic matter? - ANSWERSBy products THM/HAA Diseases by contaminated water also known as waterborn disease are? - ANSWERSDysentery, Hyphoid, Giardiasis, Hepatitis A fire and explosion exsist if granulated disinfectant, calcium hydrochlorite come in contact with? - ANSWERSOil petro products Following Lock Out Tag Out (LOTO) the first step a oparater should take to restart pump after emergency repairs are performed? - ANSWERSCall the person who owns or put the locks on The Texas hazard communication act 1985 requires employers to? - ANSWERSProvide info on Haz Chem in the work place. A flagger for traffic control - ANSWERSTxDoT When storing gas chlorine cylinders the containment room should include both high level fresh intake fan and floor exhaust vent because chlorine is? - ANSWERSHeavy then Air Shoring takes place when trench is more than? - ANSWERS+5ft TCEQ requires a combined filter effluent turbity of 0.3 or less in at least 95% of measurements taken each month? - ANSWERS0.3 A boil water notice for? - ANSWERSIn the event of low water pressure 20psi. Water outage, ECell For public water systems with more than 250 connections chlorine residual testing must be performed at least once a? - ANSWERSDay (disinfection) Both ground and elevated tanks must be inspected at least? - ANSWERSYearly Dead-end mains must be flushed at least - ANSWERSMonthly Minimum pressure in wa6er distribution system should never drop below? - ANSWERS20psi A public water system operater with a class D license is not eligible to receive new license and must upgrade to a C license if operating as? - ANSWERSSupervision According to TCEQ chapter 290 rules which of the following shall be accessible in case of a chlorinated room leak? - ANSWERSSCBA Which of the following is public water system? - ANSWERSMobile home park No potential source of contaminated water should be located within ____ of a well? - ANSWERS50ft