2026 IL Class B Water Operator Test Questions With
Complete Solutions
A sudden incrase in efflunet turbidity indicates what? Correct
Answers Filter Breakthrough
Air scouring works particulary well for what type of filter bed?
Correct Answers Monomedium beds.
As solids settle to the bottom of a sedimentation basin, Correct
Answers A sludge layer develops.
Block salt is sometimes used for home softeners, but it is not
suitable for larger installations because Correct Answers It's a
small surface area does not allow it to dissolve fast enough.
C x T values are based on? Correct Answers Concentration of
chlorine, contact time, PH, and temperature.
Chlorine cylinders and ton containers are equipped with valves,
which must comply with standards set by which organization?
Correct Answers The chlorine institute
Common Types Of Underdrain Systems are? Correct Answers
Pipe Lateral Collectors
Perforated Tile Bottoms
Wheeler Filter Bottoms
Porous Plate Bottoms
False Floor Underdrain Systems
, Compared to air, how dense is chlorine gas? Correct Answers
2.5 times as dense
Conventional sedimentation has a_______removal of
Cryptosporidium oocysts. Correct Answers Less that 0.5-log
Dissolved Air Floatation is particularly good for removing.
Correct Answers Algae
Filter tanks are generlly made? Correct Answers Rectangular
and constructed of concrete
Four zones for sedimentation basins? Correct Answers 1.
Influent Zone
2. Settling Zone
3. Effluent Zone
4. Sludge Zone
Gravel displacement in a filter bed from backwash rates with too
high of a velocity could eventually cause
a. compaction of the filter media.
b. loss of media into the backwash troughs.
c. a sand boil.
d. bed shrinkage. Correct Answers C. A sand Boil
How often should the fluoride concentration of treated water be
measured? Correct Answers Every day
If enteric disease-causing protozoans have been found in the
effluent of a water plant which is the most probable solution?
Complete Solutions
A sudden incrase in efflunet turbidity indicates what? Correct
Answers Filter Breakthrough
Air scouring works particulary well for what type of filter bed?
Correct Answers Monomedium beds.
As solids settle to the bottom of a sedimentation basin, Correct
Answers A sludge layer develops.
Block salt is sometimes used for home softeners, but it is not
suitable for larger installations because Correct Answers It's a
small surface area does not allow it to dissolve fast enough.
C x T values are based on? Correct Answers Concentration of
chlorine, contact time, PH, and temperature.
Chlorine cylinders and ton containers are equipped with valves,
which must comply with standards set by which organization?
Correct Answers The chlorine institute
Common Types Of Underdrain Systems are? Correct Answers
Pipe Lateral Collectors
Perforated Tile Bottoms
Wheeler Filter Bottoms
Porous Plate Bottoms
False Floor Underdrain Systems
, Compared to air, how dense is chlorine gas? Correct Answers
2.5 times as dense
Conventional sedimentation has a_______removal of
Cryptosporidium oocysts. Correct Answers Less that 0.5-log
Dissolved Air Floatation is particularly good for removing.
Correct Answers Algae
Filter tanks are generlly made? Correct Answers Rectangular
and constructed of concrete
Four zones for sedimentation basins? Correct Answers 1.
Influent Zone
2. Settling Zone
3. Effluent Zone
4. Sludge Zone
Gravel displacement in a filter bed from backwash rates with too
high of a velocity could eventually cause
a. compaction of the filter media.
b. loss of media into the backwash troughs.
c. a sand boil.
d. bed shrinkage. Correct Answers C. A sand Boil
How often should the fluoride concentration of treated water be
measured? Correct Answers Every day
If enteric disease-causing protozoans have been found in the
effluent of a water plant which is the most probable solution?
