TEXAS CLASS D WATER LICENSE EXAM |
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS GRADED A+ LATEST
2025/2026
What kind of test assists the operator in determining which chemical,
and how much to apply in the coagulation and flocculation process? -
Correct Answer > jar tests
To remove suspended solids and chlorine-resistant microorganisms,
surface water must be? - Correct Answer > disinfected
When temperature decreases , the viscosity of the water increases and
the rate of floc settling is? - Correct Answer > decreased
Thick sludge blankets must not be allowed to form in sedimentation
basins because they could create taste and odor problems an change
the chemical quality of the? - Correct Answer > water
Chemical dosages will be determined by a series of jar tests. The
chemical dosage should be such that no concentrations over 10 NTU
preferably as low as how many NTU shall go onto the filter? - Correct
Answer > 5
,What is the final step in removing suspended matter and chlorine-
resistant microorganisms? - Correct Answer > filtering
Turbidity, pH, temperature, alkalinity, and chemical dosage as well as
the amount and characteristics of suspended materials in raw water
will influence? - Correct Answer > coagulation
Very low turbidity waters where turbidity is of a colloidal nature , are
difficult to coagulate. Very finely suspended solids (turbidity) will
require an increase or a decrease in coagulant dosages? - Correct
Answer > increase
Sludge blanket clarifiers (upflow clarifiers) mix, coagulate, flocculate,
and settle in the same unit. The flow rises through the sludge blanket,
encouraging filtering and? - Correct Answer > settling
Sludge is disposed of in lagoons, discharged into sanitary sewers, or
dewatered and hauled to? - Correct Answer > sanitary landfills
What is the final step in removing suspended matter and chlorine-
resistant microorganisms? - Correct Answer > filtration
A filter has 24 to 30 inches of porous material such as sand or
anthracite coal called? - Correct Answer > filter media
, A common filter is the? - Correct Answer > rapid sand filter
As water percolates through the media, the filter will gather solids. As
the solids increase, there will be a loss of head (pressure) through the
filter due to increased? - Correct Answer > friction
When the head loss is how many feet, the filter must be backwashed? -
Correct Answer > 6 to 10
Operators may use other criteria such as filter effluent, turbidity or
length of filter time to decide when to? - Correct Answer >
backwash
If backwashing is done improperly what forms in the media causing it to
crack and clog? - Correct Answer > mudballs
Filtration rates range from 2 to how many gallons per minute? -
Correct Answer > 4
The state requires pressure filters to operate at ? per square foot. -
Correct Answer > 2 gpm
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS GRADED A+ LATEST
2025/2026
What kind of test assists the operator in determining which chemical,
and how much to apply in the coagulation and flocculation process? -
Correct Answer > jar tests
To remove suspended solids and chlorine-resistant microorganisms,
surface water must be? - Correct Answer > disinfected
When temperature decreases , the viscosity of the water increases and
the rate of floc settling is? - Correct Answer > decreased
Thick sludge blankets must not be allowed to form in sedimentation
basins because they could create taste and odor problems an change
the chemical quality of the? - Correct Answer > water
Chemical dosages will be determined by a series of jar tests. The
chemical dosage should be such that no concentrations over 10 NTU
preferably as low as how many NTU shall go onto the filter? - Correct
Answer > 5
,What is the final step in removing suspended matter and chlorine-
resistant microorganisms? - Correct Answer > filtering
Turbidity, pH, temperature, alkalinity, and chemical dosage as well as
the amount and characteristics of suspended materials in raw water
will influence? - Correct Answer > coagulation
Very low turbidity waters where turbidity is of a colloidal nature , are
difficult to coagulate. Very finely suspended solids (turbidity) will
require an increase or a decrease in coagulant dosages? - Correct
Answer > increase
Sludge blanket clarifiers (upflow clarifiers) mix, coagulate, flocculate,
and settle in the same unit. The flow rises through the sludge blanket,
encouraging filtering and? - Correct Answer > settling
Sludge is disposed of in lagoons, discharged into sanitary sewers, or
dewatered and hauled to? - Correct Answer > sanitary landfills
What is the final step in removing suspended matter and chlorine-
resistant microorganisms? - Correct Answer > filtration
A filter has 24 to 30 inches of porous material such as sand or
anthracite coal called? - Correct Answer > filter media
, A common filter is the? - Correct Answer > rapid sand filter
As water percolates through the media, the filter will gather solids. As
the solids increase, there will be a loss of head (pressure) through the
filter due to increased? - Correct Answer > friction
When the head loss is how many feet, the filter must be backwashed? -
Correct Answer > 6 to 10
Operators may use other criteria such as filter effluent, turbidity or
length of filter time to decide when to? - Correct Answer >
backwash
If backwashing is done improperly what forms in the media causing it to
crack and clog? - Correct Answer > mudballs
Filtration rates range from 2 to how many gallons per minute? -
Correct Answer > 4
The state requires pressure filters to operate at ? per square foot. -
Correct Answer > 2 gpm
