The natural repelling force that prevents particles in water from sticking together.
What is zeta potential?
100
A float travels 500 ft in 5 minutes and 22 seconds. Find the velocity in ft/sec.
What is 1.55 ft/sec ?
100
The optimal fluoride dose depends on this.
What is climate/amount of water people drink in a day?
100
The pH endpoint for phenophthalein alkalinity.
What is 8.3?
100
The gradual deterioration or destruction of a substance or material by chemical reaction with the water.
What is corrosion?
200
The most widely used coagulant.
What is alum?
200
A water plant wants a fluoride concentration of 1.3 mg/L in the finished water. The raw fluoride content is 0.2 mg/L. Find the amount of fluoride to be added.
What is 1.1 mg/L ?
200
This crippling disease consists of rheumatic attacks and pain in the joints and is caused by consuming 20 mg or more of Fluoride for many years.
What is skeletal fluorosis?
200
Glass or plastic tubes usually open at both ends that are used to transfer specific amounts of liquid from one container to another.
What are pipets?
200
A form of localized corrosion caused by the reaction of dissimilar metals in an electrolyte such as water.
What is galvanic corrosion?
300
This coagulant is an iron salt that is highly corrosive, will crystalllize at 30 F, and requires 0.6 mg/L of alkalinity for each mg/L of coagulant added.
What is ferric chloride?
300
A 6 inch diameter pipe has water flowing at a velocity of 120 ft/ min. Find the flow rate in gallons per minute.
What is 176 gpm?
300
This type of saturator is not approved in the State of Tennessee.
What is downflow saturator?
300
The standard temperature and pressure setting for an autoclave.
What is 121 C at 15 psi?
300
This type of phosphate works well for lead and copper because it coats the inside of the pipe.
What are orthophosphates?
400
This type of coagulant aid is made up of extremely large molecules that when dissolved in water produce highly charged ions.
What are polymers?
400
The average flow for a water plant is 6.3 MGD. A jar test indicates that the best alum dose is 19 mg/L. Find the amount of lbs/day the operator will need to feed.
What is 998.3 lbs/day?
400
Fluoride will form an insoluble precipitate with chemicals containing this element.
What is calcium?
400
A QA/QC test that determines accuracy, a known amount of standard is added to a sample and the results should equal the sample value plus the added known amount. The goal is to have 100% recovery of the added amount and sample.
What is a sample spike?
400
This test measures the effects of the water on a small section of metal inserted in the water line.
What is a coupon test?
500
The minimum amount of alkalinity that should be maintained to prevent reformation of floc in the distribution system.
What is 10 mg/L?
500
The flow through a 10 inch diameter pipe is 3.2 MGD. Find the velocity of the water in ft/sec.
What is 9.09 ft/sec ?
500
This commonly added chemical will cause abnormally high readings with the SPADNS test.
What is phosphate?
500
Lead and copper samples need to be preserved with this acid to a pH less than 2.
What is nitric acid?
500
Quicklime should never be stored with this chemical because if they react large amounts of heat and hydrogen gas are produced.