1|Page
WATER TREATMENT GRADE 2 LATEST 2025 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In lime softening facilities, it is normally good practice store a
minimum of _____ supply of each chemical. - answer-1 months
What is the term for a conical tank in which the softening
reactions take place quite rapidly as the water swirls upward
trough the unit? - answer-pellet reactor
When magnesium hardness is treated with lime, what is
precipitated? - answer-magnesium hydroxide
Why is soda ash needed to remove noncarbonate hardness? -
answer-to serve as an additional carbonate to form calcium
carbonate
What happens when quicklime is added to water? - answer-it gets
hot and forms hydrated lime in a slurry
,2|Page
What is carbon dioxide used for in lime softening? - answer-to
correct the ph and stabilize the water prior to filtration
What federal regulation requires tat samples from customers' taps
be analyzed for the presence of lead and copper? - answer-lead
and copper rule
Which of the following is the best type of salt to use in the
regeneration of ion exchange softener resin? - answer-rock salt or
pellet-type salt
Once the ion exchange resin can no longer remove hardness, it is
said to be - answer-exhausted
When backwashing a ion exchange unit, how much should the
bed expand from water introduced from the bottom of the ion
exchange column? - answer-50-75%
,3|Page
Ion exchange processes can typically be used for direct
groundwater treatment as long as turbidity and _________ levels
are not excessive. - answer-iron
Weak-base anion exchange resins behave much like their weak-
acid counterparts; they do not remove anions above a ph of -
answer-6
Block salt is sometimes used for home softeners, but it is not
suitable for larger installations because - answer-its small surface
area does not allow it to dissolve fast enough
What are cations? - answer-positively charged ions, such as
calcium and magnesium, that migrate toward the cathode
What is another term for the service cycle? - answer-operational
cycle
What element in source water acts as the precursor to disinfection
by-product production? - answer-total organic carbon
, 4|Page
Powdered activated carbon is primarily used to control - answer-
organic compounds responsible for tastes and odors
Gac contractors can be used when formation of trihalomethanes
or other disinfection by-products _______ an adjustment of the
disinfectants or other treatment processes. - answer-cannot be
prevented by
Which f the following happens at the surfaces of the pac particles
if they are coated with coagulants or other water treatment
chemicals? - answer-they lose their capacity to absorb
How should burning carbon be handled? - answer-it should be
covered with a fine mist of spray from a hose or chemical foam
extinguisher
In a slurry feed system, where should the feeder be located to
ensure there is no danger that the carbon will settle out in the
feed line because of the low flow velocity? - answer-at exactly the
feed point
WATER TREATMENT GRADE 2 LATEST 2025 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In lime softening facilities, it is normally good practice store a
minimum of _____ supply of each chemical. - answer-1 months
What is the term for a conical tank in which the softening
reactions take place quite rapidly as the water swirls upward
trough the unit? - answer-pellet reactor
When magnesium hardness is treated with lime, what is
precipitated? - answer-magnesium hydroxide
Why is soda ash needed to remove noncarbonate hardness? -
answer-to serve as an additional carbonate to form calcium
carbonate
What happens when quicklime is added to water? - answer-it gets
hot and forms hydrated lime in a slurry
,2|Page
What is carbon dioxide used for in lime softening? - answer-to
correct the ph and stabilize the water prior to filtration
What federal regulation requires tat samples from customers' taps
be analyzed for the presence of lead and copper? - answer-lead
and copper rule
Which of the following is the best type of salt to use in the
regeneration of ion exchange softener resin? - answer-rock salt or
pellet-type salt
Once the ion exchange resin can no longer remove hardness, it is
said to be - answer-exhausted
When backwashing a ion exchange unit, how much should the
bed expand from water introduced from the bottom of the ion
exchange column? - answer-50-75%
,3|Page
Ion exchange processes can typically be used for direct
groundwater treatment as long as turbidity and _________ levels
are not excessive. - answer-iron
Weak-base anion exchange resins behave much like their weak-
acid counterparts; they do not remove anions above a ph of -
answer-6
Block salt is sometimes used for home softeners, but it is not
suitable for larger installations because - answer-its small surface
area does not allow it to dissolve fast enough
What are cations? - answer-positively charged ions, such as
calcium and magnesium, that migrate toward the cathode
What is another term for the service cycle? - answer-operational
cycle
What element in source water acts as the precursor to disinfection
by-product production? - answer-total organic carbon
, 4|Page
Powdered activated carbon is primarily used to control - answer-
organic compounds responsible for tastes and odors
Gac contractors can be used when formation of trihalomethanes
or other disinfection by-products _______ an adjustment of the
disinfectants or other treatment processes. - answer-cannot be
prevented by
Which f the following happens at the surfaces of the pac particles
if they are coated with coagulants or other water treatment
chemicals? - answer-they lose their capacity to absorb
How should burning carbon be handled? - answer-it should be
covered with a fine mist of spray from a hose or chemical foam
extinguisher
In a slurry feed system, where should the feeder be located to
ensure there is no danger that the carbon will settle out in the
feed line because of the low flow velocity? - answer-at exactly the
feed point
