WQA CWS-1 Practice Test 2 (25 Questions)

This is a shorter practice test.  Have Fun!

1.  By weight water consists of ___________ oxygen.




2.  Aeration serves 2 purposes in water treatment which are:





3.  Which type of aeration system is best suited for the oxygenation of water from chemical reactions, which can transform dissolved metal substances into metal hydroxide compounds.





4.  Which is the most widely used and most versatile product in both water & waste water treatments?





5.  A PH range of __________ and a water temperature of between 60 & 80 degrees provide the best environment for maximum activated carbon chlorine removal.





6.  Which of the following is an example of absorption?





7.  If you placed a piece of litmus paper in household bleach, it would turn what color?





8.  A pH of 3.0 is __________ more acidic than a ph of 7.0.





9.  According to the WQA standard, water that is 3.5 to 7.0 gpg is considered:





10.  The term “salt efficiency” is a measure by which home water softeners are rated and is determined by dividing the grains of hardness removed per cycle by the pounds of salt used for regeneration.  Generally a rating of ____________ is considered an efficient unit.





11.  Barium presence can significantly reduce the effectiveness of a softener for hardness reduction.



12.  What is the ion that exchanges with nitrates in an anion nitrate removal system?





13.  What percent of sodium chloride concentration is considered a full strength brine?





14.  Modern day cation resins may fracture or break down physically if they are over salted.



15.  Another name for dissolved iron is:





16.  Levels of iron over ___________ can cause discoloration in the home.





17.  Besides smelling really bad, hydrogen sulfide:





18.  Hardness minerals in the softening process are:




19.  Iron, one of the most common elements in the earth's crust, is also the most susceptible to corrosion.



20.  Low to moderate concentrations of chlorides and sulfates may add palatability to the water.



21.  If a manufacturer's installation instructions are ever at variance with the area building codes, the installer should follow the local regulations.



22.  If a fully automatic softener were installed to soften 30 grain water for a family of six, using an estimated 50 gallons of water each per day, the unit would have to have a minimum daily capacity of:




23.  Water from which all or most minerals have been removed through the ion exchange process is referred to as:





24.  An ion is an electrically charged atom or group of atoms.



25.  Water and carbon dioxide react to produce a weak acid called ___________acid: