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A noisy or vibrating valve may be an indication of what? Cavitation The selective destruction or inactivation of pathogenic organisms is Disinfection Pathogenic organisms can be removed from water, killed, or inactivated by Filtration The most commonly used distribution system disinfection is Fre...

Chlorination is the most common means of disinfection used today to protect the public's health True As water mains and reservoirs become older, they require less and less maintenance. False Routine water quality monitoring of distribution systems consists of collecting samples at remote locati...

Head is measured in feet A plat is A map Which type of valve will prevent the collapse of a pipe Air-and-vaccume relief valve The highest degree of protection of a coated steel pipe is cathodic protection At which time of day is the age of the water stored in the distribution system the highest?...

What is the general definition of an ion? An _________ with a positive or negative charge Atom A continuous positive pressure in a distribution system is essential for preventing what event? Backflow Event _____________ water pressure must be maintained to ensure adequate customer service during...

Water is most dense at A. 212 DegF B. Boiling C. Freezing D. 4 DegC D The three types of main valves on dry-barrel hydrants are A. Standard compression, non-standard, and toggle B. Standard compression, Corey, and wave action C. Standard compression, Corey, and Toggle D. Standard compressio...

The only absolutely reliable method of backflow prevention is the use of Air Gap The bubbles formed in a positive multiple tube fermentation test are Carbon Dioxide The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is 40 lbs If you encounter a liquid chlorine leak i...

The term aquifer refers to? Water bearing strata The use of a well supply as a source normally results in? Water of consistent quality Maximum Safe Yield of a water source is? The quantity of water that can be taken from a source of supply over a period of years without depleting the source perma...

The difference between the static groundwater level and the pumping level is the Radius of influence Drawdown Cone of depression Watershed Drawdown A customer complaint about the presence of brown floc in tap water can best be handled by Denying that it is from your pipes Scheduling a visit t...

Which process converts ammonia to nitrite and nitrate? Nitrification What is the maximum advisable rate of chlorine gas removal from a 150- pound cylinder? 40 pounds per day What is a type of positive displacement water meter? Nutating- disk meter What is a power-operated mechanism for opening a...

What the primary objective of water distribution operators deliver safe and pleasant drinking water to the consumers what should the distribution operator do if there is a complaint about the water? record the info and have the problem investigated and notify the person complained and what corre...

A 6-in. pipeline needs to be flushed. If the desired length of pipeline to be flushed is 316 ft, how many minutes will it take to flush the line at 31 gpm? a. 10 minutes b. 15 minutes c. 30 minutes d. 60 minutes Answer: b. 15 minutes What is the area of a trench that is 22.4 ft long and 3.3 ft...

A 6-in. pipeline needs to be flushed. If the desired length of pipeline to be flushed is 316 ft, how many minutes will it take to flush the line at 31 gpm? a. 10 minutes b. 15 minutes c. 30 minutes d. 60 minutes Answer: b. 15 minutes What is the area of a trench that is 22.4 ft long and 3.3 ft...