Illinois Class C Water Certification 80 Questions and Answers verified.

Illinois Class C Water Certification 80 Questions and aq aq aq aq aq aq aq a




Answers verified
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When using a sodium Fluoride Saturator Why should you use Soft water? -
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aq ✅ To prevent the precipitation of calcium and magnesium fluoride
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What is a laglier Index? -
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✅ The Langelier Index is an approximate indicator of the degree of saturation of calcium carbonate i
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n water. It is calculated (58 KB) using the pH, alkalinity, calcium concentration, total dissolved solids, a
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nd water temperature of a water sample collected at the tap.
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What does a Latern ring do, and where is it located? -
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aq ✅ A perforated hollow ring keeps the shaft cool and lubricated in the center of a packing box
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What does a well's wear ring do? -
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aq ✅ Close running renewable clearance which reduces leaking. it is in the pump case on the impeller
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How do you install packing? -
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✅ Cut with a beveled edge, place in gland, tighten gland snugly, alowing a small amount of waret to l
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eak.



How do you mix water and acid? -
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aq ✅ Always add acid to water (strong to weak)
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How do you figure how long it will take water level to rise 2 foot? -
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aq ✅ 1. volume of tank 2.Gallons per foot 3.What is the flow?
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What type of Fluoride do you not mix with Chlorine? -
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aq ✅ HFS Acid aq aq




How often do backflow devices (RPZ) need to be tested? -
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aq ✅ once a year
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, How long do you wait to read the results after a free chlorine reagent is mixed with water? -
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✅ within one minute
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How long do you wait to read the results after a total chlorine reagent is mixed with water? -
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✅ after three but before six
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Classify PH levels - aq aq aq aq




✅ 7 is neutral above 7 is alkaline below 7 is acidic
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when should and altitude valve on a storage tank open? -
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✅ when water is being called for due to lower levels in higher elevation tanks
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What reacts with Chlorine to create "combined Chlorine?" -
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✅ Nitrogen tricloride(NCl3), dichloramine (NHCl2), and monochloromine(NH2Cl)
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One-ton Chlorine gas cylinder what valve does chlorine gas come from? -
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✅ The top valve
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What does a chlorine cylinder need to convert liquid chlorine into gas? -
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✅ An Evaporator
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What is the per-capita use of water in the US? -
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✅ 98-100 gallons
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Why is a check valve needed on liquid chemical feed pumps? -
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✅ to prevent loss of prime
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A pump runs backwards after being shut off. what is the problem? -
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✅ bad check valve
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