Water Treatment Operator Level 1 Sample
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questions with correct answers
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What |are |the |two |important |factors |impacting |the |effectiveness |of |chlorination? |- |CORRECT |ANSWER-
Concentration |of |chlorine |and |contact |time
The |treatment |process |that |controls |corrosion |or |scaling |is |known |as |what? |- |CORRECT |ANSWER-Stabilization
Permanganate |reactions |are |highly |dependent |on |what |factor? |- |CORRECT |ANSWER-pH
It |is |hardest |to |kill |the |organism |that |causes |what |illness? |- |CORRECT |ANSWER-Cryptosporidiosis
Disinfection |of |water |wells |with |free |chlorine |requires |exposure |for |how |long |and |at |what |concentration? |- |
CORRECT |ANSWER-12 |to |24 |hours; |50mg/L
Flocculation |basins |are |usually |designed |to |provide |for |detention |times |of |how |long? |- |CORRECT |ANSWER-15 |to |
45 |minutes
Alum |works |best |in |a |pH |range |of |what? |- |CORRECT |ANSWER-5.8 |to |7.5
What |has |little |effect |on |colloidal |particles |because |of |their |small |size? |- |CORRECT |ANSWER-Gravity
What |natural |electrical |force |keeps |colloidal |particles |apart |in |water |treatment? |- |CORRECT |ANSWER-Zeta |
potential
What |does |the |zeta |potential |measure? |- |CORRECT |ANSWER-The |number |of |excess |electrons |found |on |the |
surface |of |all |particulate |matter
What |device |collects |the |settled |water |as |it |leaves |the |sedimentation |basin? |- |CORRECT |ANSWER-The |effluent |
launder
In |solid-contact |basins |with |fairly |constant |water |quality |parameters, |how |often |should |the |solids |concentration |be |
determined? |- |CORRECT |ANSWER-At |least |twice |per |day
What |is |the |definition |of |decant? |- |CORRECT |ANSWER-To |draw |off |the |liquid |from |a |vessel |of |any |size |without |
stirring |up |bottom |sedimentation
How |often |should |sedimentation |basins |with |mechanical |sludge |removal |equipment |be |drained |and |inspected? |- |
CORRECT |ANSWER-Once |a |year
What |is |the |most |important |reason |to |reduce |turbidity? |- |CORRECT |ANSWER-To |remove |pathogens
What |is |the |filtration |flow |rate |through |a |manganese |greensand |pressure |filter |at |10 |degrees |C? |- |CORRECT |
ANSWER-2 |to |3 |gpm/sq |ft
When |is |a |filter |ripening? |- |CORRECT |ANSWER-When |it |becomes |more |efficient |in |particle |removal
Nursylab.com
| | | | | |
questions with correct answers
| | |
What |are |the |two |important |factors |impacting |the |effectiveness |of |chlorination? |- |CORRECT |ANSWER-
Concentration |of |chlorine |and |contact |time
The |treatment |process |that |controls |corrosion |or |scaling |is |known |as |what? |- |CORRECT |ANSWER-Stabilization
Permanganate |reactions |are |highly |dependent |on |what |factor? |- |CORRECT |ANSWER-pH
It |is |hardest |to |kill |the |organism |that |causes |what |illness? |- |CORRECT |ANSWER-Cryptosporidiosis
Disinfection |of |water |wells |with |free |chlorine |requires |exposure |for |how |long |and |at |what |concentration? |- |
CORRECT |ANSWER-12 |to |24 |hours; |50mg/L
Flocculation |basins |are |usually |designed |to |provide |for |detention |times |of |how |long? |- |CORRECT |ANSWER-15 |to |
45 |minutes
Alum |works |best |in |a |pH |range |of |what? |- |CORRECT |ANSWER-5.8 |to |7.5
What |has |little |effect |on |colloidal |particles |because |of |their |small |size? |- |CORRECT |ANSWER-Gravity
What |natural |electrical |force |keeps |colloidal |particles |apart |in |water |treatment? |- |CORRECT |ANSWER-Zeta |
potential
What |does |the |zeta |potential |measure? |- |CORRECT |ANSWER-The |number |of |excess |electrons |found |on |the |
surface |of |all |particulate |matter
What |device |collects |the |settled |water |as |it |leaves |the |sedimentation |basin? |- |CORRECT |ANSWER-The |effluent |
launder
In |solid-contact |basins |with |fairly |constant |water |quality |parameters, |how |often |should |the |solids |concentration |be |
determined? |- |CORRECT |ANSWER-At |least |twice |per |day
What |is |the |definition |of |decant? |- |CORRECT |ANSWER-To |draw |off |the |liquid |from |a |vessel |of |any |size |without |
stirring |up |bottom |sedimentation
How |often |should |sedimentation |basins |with |mechanical |sludge |removal |equipment |be |drained |and |inspected? |- |
CORRECT |ANSWER-Once |a |year
What |is |the |most |important |reason |to |reduce |turbidity? |- |CORRECT |ANSWER-To |remove |pathogens
What |is |the |filtration |flow |rate |through |a |manganese |greensand |pressure |filter |at |10 |degrees |C? |- |CORRECT |
ANSWER-2 |to |3 |gpm/sq |ft
When |is |a |filter |ripening? |- |CORRECT |ANSWER-When |it |becomes |more |efficient |in |particle |removal
Nursylab.com
