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Class D Basic Water Practice Test Questions with Answers, Exams of Water Resources Planning and Management

Yale UniversityWater Resources Planning and Management

A comprehensive set of practice test questions and answers related to basic water treatment and distribution operations. It covers a wide range of topics, including water treatment processes, water quality parameters, water distribution system management, and regulatory requirements. The questions are designed to assess the knowledge and understanding of water system operators who are preparing for the class d water operator certification exam. Questions on topics such as water chemistry, disinfection, water storage, water line installation, and water quality monitoring. The answers provided offer detailed explanations and insights into the correct responses, making this document a valuable resource for water system operators seeking to enhance their knowledge and skills in the field of water treatment and distribution.

Typology: Exams

2023/2024

Available from 08/21/2024

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Class D Basic Water Practice Test
questions with correct answers
A trench 24in wide 800ft long and 4ft deep is to be excavated. The amount of soil
excavated is? - ANSWER: ➡ 6400ft
An elevated storage tank had pipe 150 feet above ground when full water pressure
at the bottom psi should be? - ANSWER: ➡ 65
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? - ANSWER: ➡ 1.9
Water is pumped 250 gallons a min. How long to fill 100,000 gallon tank? -
ANSWER: ➡ 6.6
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? - ANSWER: ➡ 1.6
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? - ANSWER: ➡
10
The hydrologic cycle is? - ANSWER: ➡ Recycling of water between the earth &
atmosphere
Basic water PH reading is? - ANSWER: ➡ 8.5
A chemical of water impacting scaling is? - ANSWER: ➡ Calcium
What is Raw water? - ANSWER: ➡ Untreated water
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Class D Basic Water Practice Test

questions with correct answers

A trench 24in wide 800ft long and 4ft deep is to be excavated. The amount of soil excavated is? - ANSWER: ➡ 6400ft An elevated storage tank had pipe 150 feet above ground when full water pressure at the bottom psi should be? - ANSWER: ➡ 65 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? - ANSWER: ➡ 1. Water is pumped 250 gallons a min. How long to fill 100,000 gallon tank? - ANSWER: ➡ 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? - ANSWER: ➡ 1. 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? - ANSWER: ➡ 10 The hydrologic cycle is? - ANSWER: ➡ Recycling of water between the earth & atmosphere Basic water PH reading is? - ANSWER: ➡ 8. A chemical of water impacting scaling is? - ANSWER: ➡ Calcium What is Raw water? - ANSWER: ➡ Untreated water

Regulated chemical compound formed when disinfectants react with naturally occurring organic matter? - ANSWER: ➡ By products THM/HAA Diseases by contaminated water also known as waterborn disease are? - ANSWER: ➡ Dysentery, Hyphoid, Giardiasis, Hepatitis A fire and explosion exsist if granulated disinfectant, calcium hydrochlorite come in contact with? - ANSWER: ➡ Oil petro products Following Lock Out Tag Out (LOTO) the first step a oparater should take to restart pump after emergency repairs are performed? - ANSWER: ➡ Call the person who owns or put the locks on The Texas hazard communication act 1985 requires employers to? - ANSWER: ➡ Provide info on Haz Chem in the work place. A flagger for traffic control - ANSWER: ➡ TxDoT When storing gas chlorine cylinders the containment room should include both high level fresh intake fan and floor exhaust vent because chlorine is? - ANSWER: ➡ Heavy then Air Shoring takes place when trench is more than? - ANSWER: ➡ +5ft TCEQ requires a combined filter effluent turbity of 0.3 or less in at least 95% of measurements taken each month? - ANSWER: ➡ 0. A boil water notice for? - ANSWER: ➡ In 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? - ANSWER: ➡ Day (disinfection)

All water secured from sources shall be given complete treatment at a plant providing facilities for? - ANSWER: ➡ Pre treatment, disinfection, taste & odor control coagulation, sedimentation, covered clear well storage. Primary purpose of water well casing is to? - ANSWER: ➡ Protect from collapse & surface confirmation. Steel & elevated storage must be painted inside & out to protect from? - ANSWER: ➡ Corrosion Waterline & wastewater line shall not be installed no closer to each other then? - ANSWER: ➡ 9ft Type of value generally used to stop value isolation in sections of the system? - ANSWER: ➡ Isolation value A check value limits flow in one direction an acceptable used for this type of value is? - ANSWER: ➡ backflow prevention when pump is off A service pipe is generally connected to amin by means of? - ANSWER: ➡ Corporation (STOP) To protect treated water from contamination a ground storage tank should? - ANSWER: ➡ screened vents, locked hatches dust covers, flaps, entry ports Pressure in a distribution should not drop below required limits because? - ANSWER: ➡ Contamination could be drawn info line The final process in the production of safe & bacteria free water is? - ANSWER: ➡ Chlorination A chlorine cylinder value is leaking if ammonia vapor passed under the value the presence of a leak would be? - ANSWER: ➡ White smoke

TCEQ requires chlorinated facilities to be provided for? - ANSWER: ➡ All public water system in Texas After all demands for chlorine is meet the term used for remaining free chlorine is?

  • ANSWER: ➡ Residuals Chlorimines are weak disinfectant that? - ANSWER: ➡ Are formed by Ammoniaclorine Chlorine demands refer to? - ANSWER: ➡ Amount of chlorine used by reading agents and organic matter Laboratory reports coliform organism in sample water coliforms indicate? - ANSWER: ➡ Disease producing organisms presents The impact of coagulation dose or mixing - ANSWER: ➡ Jar test apparatus Sample requirements for lead & copper include? - ANSWER: ➡ Samplings hot water taps from inside, flushing til temp change, determine if chlorine residual percent before collection, insure water in line did not flow at least 24hrs before collection. Tap water cold tap water 1 liter 6hr of stagnation