Water Distribution – Questions And Answers/water distribution practice test Level 1/Water distribution practice test D1 /D2//Water distribution practice exam #2 (D1-D2)/Water Distribution Test//Water Distribution Exam Questions And Answers/Water Distribut

The minimum and maximum chloride residual in a water distribution system is ? - Answer- 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - Answer- 10 mg/L The minimum number of total coliform samples that must ...

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

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

Distribution systems are usually laid out in which of the following patterns besides Tree shaped and Grid designs? a. Loops and/or circular designs b. Vertical designs without backflow prevention devices c. Horizontal lines that flow into open ponds then back into a closed pipe d. Horizontal lin...

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

What is the federal law that protects public water supplies from harmful contaminants? - Answer- SDWA Safe Drinking Water Act MCL stands for - Answer- Maximum Contaminant Level True or False? Primary regulations are mandatory - Answer- TRUE Secondary regulations are about what 3 things? ...

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

What is the primary purpose of the SDWA? - Answer- To create uniform national standards for drinking water quality Who sets Maximum Contaminants Levels (MCLs)? - Answer- USEPA What are some of the duties of the EPA? - Answer- Sets MCLs, delegates enforcement of SDWA to state agencies, provides...

Which device measures the hydrogen ion activity in a solution? - Answer- PH Meter What is the purpose of a shaft sleeve in a centrifugal pump? - Answer- Protects the sleeve from damage What is a nutating disc - Answer- Type of water meter for small diameter domestic service what will happen...

in certain costal areas, intrusion of sea water in to groundwater basin is most commonly caused by? - Answer- over pumping from the ground basin Riparian rights are acquired how? - Answer- with title to land bordering surface water an underground layer of rock or soil that permeates the passag...