GRADE 4 WATER TREATMENT EXAM
PREP QUESTIONS AND VERIFIED
00
ANSWER
In00a00pumping00station00where00two00complete00pumping00units00are00provided,00how00much
00should00a00pump00be00capable00of00delivering?
a.)00Average00Flow
b.)00Maximum00Flow
c.)001/200the00average00flow
d.)001/200maximum00flow00-00ans-A
When00there00is00insufficient00alkalinity00present00in00water00to00react00with00the00coagulant,00
alkalinity00should00be00supplied00by
a.)00Adding00Lime
b.)00Adding00Turbidity
c.)00Reducing00plant00flow
d.)00Removing00carbon00dioxide00-00ans-A
Chlorine00dioxide00is00generated00on-
site00by00the00reaction00of00chlorine00with00what00chemical?
a.)00Oxygen
b.)00Sodium00Chlorite
c.)00Salt00Brine
d.)00Carbon00-00ans-B
Why00is00carbon00dioxide00primarily00used00in00the00stabilization00process?
a.)00Decrease00pH
b.)00Increase00pH
c.)00Tie00up00scale00forming00ions
d.)00Form00a00protective00coating00-00ans-A
If00fluoride00is00fed00ahead00of00filtration00what00can00occur?
a.)00Some00fluoride00loss
b.)00Problems00with00disinfection
c.)00Increases00in00fluoride00concentration
d.)00Formation00of00precipitate00-00ans-A
,Which00of00the00following00emergency00leak00repair00kits00should00be00on00hand00for00ton00cyli
nders?
a.)00Emergency00Kit00A
b.)00Emergency00Kit00B
c.)00Emergency00Kit00C
d.)00Emergency00Kit00D00-00ans-B
What00will00iron00that00remains00in00the00ferrous00state00do?
a.)00Be00removed00by00filters
b.)00Pass00through00the00filters
c.)00Precipitate00in00the00reaction00tank
d.)00Settle00out00-00ans-B
Short00circuiting00in00the00flocculation00process00can00be00corrected00by
a.)00Adjusting00the00pH
b.)00Decreasing00the00flows
c.)00Increasing00coagulant00dosages00
d.)00Providing00several00compartments00in00series00-00ans-D
What00removes00organic00substances00from00depleted00activated00carbon?
a.)00Degasification
b.)00Recarbonation
c.)00Reduction
d.)00Reactivation00-00ans-D
What00is00the00purpose00of00an00anti-siphon00valve00on00a00fluoride00metering00pump?
a.)00The00same00as00that00of00the00overflow00connection00on00the00supply
b.)00To00prevent00fluoridated00water00from00being00siphoned00into00the00feed00equipment
c.)00To00prevent00potential00overfeed00of00fluoride
d.)00The00same00as00that00of00a00vacuum00breaker00on00the00potable00makeup00water00line00-
00ans-B
A00perfectly00uniform00sand00would00have00a00uniformity00coefficient00of00
a.)000
b.)001
c.)001.5
d.)001.700-00ans-C
, When00handling00any00dry00fluoride00compound00one00important00safety00precaution00that00s
hould00be00observed00is00to
a.)00Have00another00operator00near00by
b.)00Keep00all00windows00closed00to00prevent00the00escape00of00dangerous00dusts00into00the00
environment
c.)00Keep00skin00contact00with00fluoride00dusts00to00a00minimum
d.)00Use00only00explosion00proof00fixtures00-00ans-C
What00calcium00carbonate00condition00should00be00maintained00for00a00good00calcium00carb
onate00coating00in00piping?
a.)00Undersaturated
b.)00Just00saturated
c.)00Oversaturated
d.)00That00which00is00indicated00by00the00corrosion00indices00-00ans-B
The00free00chlorine00residual00in00the00water00entering00the00distribution00system00cannot00be
00less00than00what00level00for00more00than00400hours?
a.)000.100mg/L
b.)000.200mg/L
c.)001.000mg/L
d.)002.o00mg/L00-00ans-B
All00community00public00water00systems00serving00more00than005000service00connections00an
d00which00have00their00own00source00of00water00are00required00to00install,00operate,00and00mai
ntain00_____________00disinfection00equipment.
a.)00Duplicate
b.)00Quadruple
c.)00Single
d.)00Triplicate00-00ans-A
Which00of00the00following00should00be00done00to00a00filter00bed00at00least00once00a00year?
a.)00Take00out00of00service
b.)00Replace
c.)00Restratify
d.)00Probe00for00gravel00displacement00-00ans-D
What00is00the00purpose00of00the00underdrain00of00a00filter?
a.)00Regulate00the00filtration00rate00and00backwash00rate00of00the00filter
b.)00Remove00giardia00and00crypto00that00pass00through00the00filter00media
c.)00Collect00filtered00water00and00distribute00backwash00water00evenly
PREP QUESTIONS AND VERIFIED
00
ANSWER
In00a00pumping00station00where00two00complete00pumping00units00are00provided,00how00much
00should00a00pump00be00capable00of00delivering?
a.)00Average00Flow
b.)00Maximum00Flow
c.)001/200the00average00flow
d.)001/200maximum00flow00-00ans-A
When00there00is00insufficient00alkalinity00present00in00water00to00react00with00the00coagulant,00
alkalinity00should00be00supplied00by
a.)00Adding00Lime
b.)00Adding00Turbidity
c.)00Reducing00plant00flow
d.)00Removing00carbon00dioxide00-00ans-A
Chlorine00dioxide00is00generated00on-
site00by00the00reaction00of00chlorine00with00what00chemical?
a.)00Oxygen
b.)00Sodium00Chlorite
c.)00Salt00Brine
d.)00Carbon00-00ans-B
Why00is00carbon00dioxide00primarily00used00in00the00stabilization00process?
a.)00Decrease00pH
b.)00Increase00pH
c.)00Tie00up00scale00forming00ions
d.)00Form00a00protective00coating00-00ans-A
If00fluoride00is00fed00ahead00of00filtration00what00can00occur?
a.)00Some00fluoride00loss
b.)00Problems00with00disinfection
c.)00Increases00in00fluoride00concentration
d.)00Formation00of00precipitate00-00ans-A
,Which00of00the00following00emergency00leak00repair00kits00should00be00on00hand00for00ton00cyli
nders?
a.)00Emergency00Kit00A
b.)00Emergency00Kit00B
c.)00Emergency00Kit00C
d.)00Emergency00Kit00D00-00ans-B
What00will00iron00that00remains00in00the00ferrous00state00do?
a.)00Be00removed00by00filters
b.)00Pass00through00the00filters
c.)00Precipitate00in00the00reaction00tank
d.)00Settle00out00-00ans-B
Short00circuiting00in00the00flocculation00process00can00be00corrected00by
a.)00Adjusting00the00pH
b.)00Decreasing00the00flows
c.)00Increasing00coagulant00dosages00
d.)00Providing00several00compartments00in00series00-00ans-D
What00removes00organic00substances00from00depleted00activated00carbon?
a.)00Degasification
b.)00Recarbonation
c.)00Reduction
d.)00Reactivation00-00ans-D
What00is00the00purpose00of00an00anti-siphon00valve00on00a00fluoride00metering00pump?
a.)00The00same00as00that00of00the00overflow00connection00on00the00supply
b.)00To00prevent00fluoridated00water00from00being00siphoned00into00the00feed00equipment
c.)00To00prevent00potential00overfeed00of00fluoride
d.)00The00same00as00that00of00a00vacuum00breaker00on00the00potable00makeup00water00line00-
00ans-B
A00perfectly00uniform00sand00would00have00a00uniformity00coefficient00of00
a.)000
b.)001
c.)001.5
d.)001.700-00ans-C
, When00handling00any00dry00fluoride00compound00one00important00safety00precaution00that00s
hould00be00observed00is00to
a.)00Have00another00operator00near00by
b.)00Keep00all00windows00closed00to00prevent00the00escape00of00dangerous00dusts00into00the00
environment
c.)00Keep00skin00contact00with00fluoride00dusts00to00a00minimum
d.)00Use00only00explosion00proof00fixtures00-00ans-C
What00calcium00carbonate00condition00should00be00maintained00for00a00good00calcium00carb
onate00coating00in00piping?
a.)00Undersaturated
b.)00Just00saturated
c.)00Oversaturated
d.)00That00which00is00indicated00by00the00corrosion00indices00-00ans-B
The00free00chlorine00residual00in00the00water00entering00the00distribution00system00cannot00be
00less00than00what00level00for00more00than00400hours?
a.)000.100mg/L
b.)000.200mg/L
c.)001.000mg/L
d.)002.o00mg/L00-00ans-B
All00community00public00water00systems00serving00more00than005000service00connections00an
d00which00have00their00own00source00of00water00are00required00to00install,00operate,00and00mai
ntain00_____________00disinfection00equipment.
a.)00Duplicate
b.)00Quadruple
c.)00Single
d.)00Triplicate00-00ans-A
Which00of00the00following00should00be00done00to00a00filter00bed00at00least00once00a00year?
a.)00Take00out00of00service
b.)00Replace
c.)00Restratify
d.)00Probe00for00gravel00displacement00-00ans-D
What00is00the00purpose00of00the00underdrain00of00a00filter?
a.)00Regulate00the00filtration00rate00and00backwash00rate00of00the00filter
b.)00Remove00giardia00and00crypto00that00pass00through00the00filter00media
c.)00Collect00filtered00water00and00distribute00backwash00water00evenly
