Water Treatment Operator Level 2 Practice Exam
The main application of potassium permanganate as an Control odor and taste.
oxidant in water treatment is to _____.
How does an inclined plate settler differ from a Requires a smaller footprint than a conventional clarifier.
conventional clarifier?
In water treatment systems what operational event occurs Calcium carbonate precipitates and coats surfaces.
when lime slurries contact surfaces?
What percentage of available chlorine does calcium 65-70%.
hypochlorite contain for disinfection?
What do flocculation and coagulation involve in water Mechanical and chemical processes.
treatment?
What benefit does a bacterial slime layer provide on pipe Prevents calcium carbonate deposition.
surfaces?
What causes air binding in water treatment filters? Air pressure greater than atmospheric pressure.
What are the two categories of corrosion in water Uniform and localized corrosion.
systems?
What factors determine the optimal pH for oxidizing iron Precipitate solubility.
and manganese in water treatment?
How does inadequate flocculation time impact floc Decreases floc formation.
formation?
What compound precipitates when excess lime softening Magnesium hydroxide.
removes magnesium ions?
What effect does preoxidation have on water treatment Improves filtration, flocculation, and sedimentation.
processes?
When water is stabilized with sulfuric acid, what CaSO₄.
noncarbonate hardness chemical is created?
At what CO₂ levels does iron removal become more 5-10 mg/L.
difficult?
What is the difference between true and apparent color in True color is after turbidity removal, apparent color is due to suspended matter.
water quality measurement?
, Water Treatment Operator Level 2 Practice Exam
Why is monomedium filter media deeper than conventional To compensate for coarser media texture.
media in water treatment?
What is a disadvantage of using chlorine dioxide as a Imparts an unpleasant taste
disinfectant?
What operational factor affects floc development in a Insufficient flocculation time.
treatment plant?
What happens if quicklime gets moist during corrosion Heat is generated, potentially igniting combustible materials.
control?
What causes air binding in a filter? Terminal head loss.
What variable enhances the effectiveness of disinfection? Higher chlorine concentrations.
How can lime be purchased in water treatment? As CaOH, called hydrated lime.
How does high pH affect hypochlorous acid dissociation? Causes faster dissociation into chlorate ions and water.
When should super-chlorination be used at a water utility? After installing new pipeline sections.
How can operators address slower floc formation when Increase alum dosage.
using alum in cold water?
What are common coagulants in water treatment? Alum.
How is chlorine demand calculated? By subtracting chlorine residual from chlorine dose.
How can THM formation be minimized in water treatment? Avoid pre-chlorination of water.
What carbonate hardness chemical precipitates during Magnesium hydroxide.
lime-softening besides CaCO₃?
The main application of potassium permanganate as an Control odor and taste.
oxidant in water treatment is to _____.
How does an inclined plate settler differ from a Requires a smaller footprint than a conventional clarifier.
conventional clarifier?
In water treatment systems what operational event occurs Calcium carbonate precipitates and coats surfaces.
when lime slurries contact surfaces?
What percentage of available chlorine does calcium 65-70%.
hypochlorite contain for disinfection?
What do flocculation and coagulation involve in water Mechanical and chemical processes.
treatment?
What benefit does a bacterial slime layer provide on pipe Prevents calcium carbonate deposition.
surfaces?
What causes air binding in water treatment filters? Air pressure greater than atmospheric pressure.
What are the two categories of corrosion in water Uniform and localized corrosion.
systems?
What factors determine the optimal pH for oxidizing iron Precipitate solubility.
and manganese in water treatment?
How does inadequate flocculation time impact floc Decreases floc formation.
formation?
What compound precipitates when excess lime softening Magnesium hydroxide.
removes magnesium ions?
What effect does preoxidation have on water treatment Improves filtration, flocculation, and sedimentation.
processes?
When water is stabilized with sulfuric acid, what CaSO₄.
noncarbonate hardness chemical is created?
At what CO₂ levels does iron removal become more 5-10 mg/L.
difficult?
What is the difference between true and apparent color in True color is after turbidity removal, apparent color is due to suspended matter.
water quality measurement?
, Water Treatment Operator Level 2 Practice Exam
Why is monomedium filter media deeper than conventional To compensate for coarser media texture.
media in water treatment?
What is a disadvantage of using chlorine dioxide as a Imparts an unpleasant taste
disinfectant?
What operational factor affects floc development in a Insufficient flocculation time.
treatment plant?
What happens if quicklime gets moist during corrosion Heat is generated, potentially igniting combustible materials.
control?
What causes air binding in a filter? Terminal head loss.
What variable enhances the effectiveness of disinfection? Higher chlorine concentrations.
How can lime be purchased in water treatment? As CaOH, called hydrated lime.
How does high pH affect hypochlorous acid dissociation? Causes faster dissociation into chlorate ions and water.
When should super-chlorination be used at a water utility? After installing new pipeline sections.
How can operators address slower floc formation when Increase alum dosage.
using alum in cold water?
What are common coagulants in water treatment? Alum.
How is chlorine demand calculated? By subtracting chlorine residual from chlorine dose.
How can THM formation be minimized in water treatment? Avoid pre-chlorination of water.
What carbonate hardness chemical precipitates during Magnesium hydroxide.
lime-softening besides CaCO₃?
