Illinois Class C Water Certification Questions With Complete Solutions
When using a sodium Fluoride Saturator Why should you use Soft water? - (ANSWER)To prevent the
precipitation of calcium and magnesium fluoride
What is a laglier Index? - (ANSWER)The Langelier Index is an approximate indicator of the degree of
saturation of calcium carbonate in water. It is calculated (58 KB) using the pH, alkalinity, calcium
concentration, total dissolved solids, and water temperature of a water sample collected at the tap.
What does a Latern ring do, and where is it located? - (ANSWER)A perforated hollow ring keeps the
shaft cool and lubricated in the center of a packing box
What does a well's wear ring do? - (ANSWER)Close running renewable clearance which reduces leaking.
it is in the pump case on the impeller
How do you install packing? - (ANSWER)Cut with a beveled edge, place in gland, tighten gland snugly,
alowing a small amount of waret to leak.
How do you mix water and acid? - (ANSWER)Always add acid to water (strong to weak)
How do you figure how long it will take water level to rise 2 foot? - (ANSWER)1. volume of tank
2.Gallons per foot 3.What is the flow?
What type of Fluoride do you not mix with Chlorine? - (ANSWER)HFS Acid
How often do backflow devices (RPZ) need to be tested? - (ANSWER)once a year
How long do you wait to read the results after a free chlorine reagent is mixed with water? -
(ANSWER)within one minute
How long do you wait to read the results after a total chlorine reagent is mixed with water? -
(ANSWER)after three but before six
, Illinois Class C Water Certification Questions With Complete Solutions
Classify PH levels - (ANSWER)7 is neutral above 7 is alkaline below 7 is acidic
when should and altitude valve on a storage tank open? - (ANSWER)when water is being called for due
to lower levels in higher elevation tanks
What reacts with Chlorine to create "combined Chlorine?" - (ANSWER)Nitrogen tricloride(NCl3),
dichloramine (NHCl2), and monochloromine(NH2Cl)
One-ton Chlorine gas cylinder what valve does chlorine gas come from? - (ANSWER)The top valve
What does a chlorine cylinder need to convert liquid chlorine into gas? - (ANSWER)An Evaporator
What is the per-capita use of water in the US? - (ANSWER)98-100 gallons
Why is a check valve needed on liquid chemical feed pumps? - (ANSWER)to prevent loss of prime
A pump runs backwards after being shut off. what is the problem? - (ANSWER)bad check valve
is ferric Iron Soluable? - (ANSWER)Yes. But ferrous Iron is not
Bacti samples must be analyzed within how many hours? - (ANSWER)30 hours
where should a pressure relief valve be located? - (ANSWER)At the high point of a distribution system
what type of samples must have no air in them? - (ANSWER)VOC's, SOC's, TTHM's, HAA5's
What distance should sewer and water mains be separated? - (ANSWER)10 Foot horizontal and 18 inch
vertical
When using a sodium Fluoride Saturator Why should you use Soft water? - (ANSWER)To prevent the
precipitation of calcium and magnesium fluoride
What is a laglier Index? - (ANSWER)The Langelier Index is an approximate indicator of the degree of
saturation of calcium carbonate in water. It is calculated (58 KB) using the pH, alkalinity, calcium
concentration, total dissolved solids, and water temperature of a water sample collected at the tap.
What does a Latern ring do, and where is it located? - (ANSWER)A perforated hollow ring keeps the
shaft cool and lubricated in the center of a packing box
What does a well's wear ring do? - (ANSWER)Close running renewable clearance which reduces leaking.
it is in the pump case on the impeller
How do you install packing? - (ANSWER)Cut with a beveled edge, place in gland, tighten gland snugly,
alowing a small amount of waret to leak.
How do you mix water and acid? - (ANSWER)Always add acid to water (strong to weak)
How do you figure how long it will take water level to rise 2 foot? - (ANSWER)1. volume of tank
2.Gallons per foot 3.What is the flow?
What type of Fluoride do you not mix with Chlorine? - (ANSWER)HFS Acid
How often do backflow devices (RPZ) need to be tested? - (ANSWER)once a year
How long do you wait to read the results after a free chlorine reagent is mixed with water? -
(ANSWER)within one minute
How long do you wait to read the results after a total chlorine reagent is mixed with water? -
(ANSWER)after three but before six
, Illinois Class C Water Certification Questions With Complete Solutions
Classify PH levels - (ANSWER)7 is neutral above 7 is alkaline below 7 is acidic
when should and altitude valve on a storage tank open? - (ANSWER)when water is being called for due
to lower levels in higher elevation tanks
What reacts with Chlorine to create "combined Chlorine?" - (ANSWER)Nitrogen tricloride(NCl3),
dichloramine (NHCl2), and monochloromine(NH2Cl)
One-ton Chlorine gas cylinder what valve does chlorine gas come from? - (ANSWER)The top valve
What does a chlorine cylinder need to convert liquid chlorine into gas? - (ANSWER)An Evaporator
What is the per-capita use of water in the US? - (ANSWER)98-100 gallons
Why is a check valve needed on liquid chemical feed pumps? - (ANSWER)to prevent loss of prime
A pump runs backwards after being shut off. what is the problem? - (ANSWER)bad check valve
is ferric Iron Soluable? - (ANSWER)Yes. But ferrous Iron is not
Bacti samples must be analyzed within how many hours? - (ANSWER)30 hours
where should a pressure relief valve be located? - (ANSWER)At the high point of a distribution system
what type of samples must have no air in them? - (ANSWER)VOC's, SOC's, TTHM's, HAA5's
What distance should sewer and water mains be separated? - (ANSWER)10 Foot horizontal and 18 inch
vertical
