Alabama Grade IV Water Operator
Study Guide questions and answers with solutions
2025/2025
UFRV - ANSWER Unit Filter Rate Volume
How can you remove truecolor? - ANSWER Coagulation & Chlorination
Synura - ANSWER Cucumber Smell
Normality - ANSWER Equivalents of solute per liter of solution
Asterionella Pandorina Uroglenopsis - ANSWER Fishy Smell
Anabaena Anacystis - ANSWER Musty Pig-Pen Smell
A centrifugal pump works correctly for a period of time but begins to
lose suction. What is the problem? - ANSWER Faulty Foot Valve
What is the effect of pH on chlorine disinfection? - ANSWER The best
disinfection occurs at lower pH. If you have high alkalinity and high pH
,(>8) consider longer chlorine contact time due to reduced efficiency of
they hypochlorite form.
Drawdown - ANSWER The lowering of the surface elevation of a body of
water, the water table, the piezometric surface, or the water surface of a
well, as a result of the withdrawal or water.
The process where Quicklime must be mixed with water. - ANSWER
Slaking - Slaked lime is calcium hydroxide. Ca(OH)₂
Why is weir balance important? - ANSWER For uniform flow of water.
What do you do if floc is carring over? - ANSWER Adjust the alum dose.
What would happen if you added water to a chlorine leak? - ANSWER
The leak would get worse.
How do you open a high pressure valve? - ANSWER Very slowly
A measure of a solution's ability to dissolve or deposit calcium
carbonate often used as an indicator of the corrosivity of water the
difference between actual pH(measured) and calculated pH. - ANSWER
Langelier Saturation Index
What hardness is most difficult to remove? - ANSWER Magnesium
Noncarbonated
,What equipment is needed to feed chlorine dioxide? - ANSWER 1)
Existing chlorination system 2) Diaphragm pump 3) Solution Tank 4)
Mixer 5) Chlorine dioxide generating tower 6) Electrical controls
The taste and odor of the water is a problem. What could make it worse?
- ANSWER Colored water from algae
Where is the beveled edge on a V notch weir? - ANSWER On the
downstream side of a measuring weir
What does a Langlier Index of 3.0 indicate? - ANSWER Scale Forming
Very short period for chemical to be dispersed. - ANSWER Flashmix
Accepted method of measuring turbidity - ANSWER Nephelometric
Selective destruction or inactivation of pathogenic organisms - ANSWER
Disinfection
The weights that will react with, displace, or is equivalent to one gram
of hydrogen - ANSWER Equivalent Weights
The appropriate place to store SCBA (Self-Contained Breathing
Apparatus) - ANSWER Outside the chlorine gas room
, A vertical empty space between a drinking water supply and an
unapproved water source used to prevent cross-contamination. It should
be twice the diameter of the pipe not to be less than 1 inch. - ANSWER
Air Gap
What are the components of a hypochlorite feed system? - ANSWER
1)Chemical solutioin tank for hypochlorite 2)Diaphram pump 3)Power
supply 4)Pressure switch 5)Water storage tank
Floc moving in a faster current in a tank or basin? - ANSWER Short-
Circuit
Crystalizes in cold weather aroung 50°F - ANSWER Caustic Soda (NaOH)
High head loss and the operator is washing filters but having short filter
runs. Turbidy is high. What is best corrective measure? - ANSWER Run
Jar Test to determine the best coagulant dosage
Measured by the amount of sulfuric acid required to lower the pH of
water to a level of 4.5 - ANSWER Alkalinity
The instrument used for measuring pressure. U-shaped tube partially
filled with fluid. - ANSWER Manometer
Study Guide questions and answers with solutions
2025/2025
UFRV - ANSWER Unit Filter Rate Volume
How can you remove truecolor? - ANSWER Coagulation & Chlorination
Synura - ANSWER Cucumber Smell
Normality - ANSWER Equivalents of solute per liter of solution
Asterionella Pandorina Uroglenopsis - ANSWER Fishy Smell
Anabaena Anacystis - ANSWER Musty Pig-Pen Smell
A centrifugal pump works correctly for a period of time but begins to
lose suction. What is the problem? - ANSWER Faulty Foot Valve
What is the effect of pH on chlorine disinfection? - ANSWER The best
disinfection occurs at lower pH. If you have high alkalinity and high pH
,(>8) consider longer chlorine contact time due to reduced efficiency of
they hypochlorite form.
Drawdown - ANSWER The lowering of the surface elevation of a body of
water, the water table, the piezometric surface, or the water surface of a
well, as a result of the withdrawal or water.
The process where Quicklime must be mixed with water. - ANSWER
Slaking - Slaked lime is calcium hydroxide. Ca(OH)₂
Why is weir balance important? - ANSWER For uniform flow of water.
What do you do if floc is carring over? - ANSWER Adjust the alum dose.
What would happen if you added water to a chlorine leak? - ANSWER
The leak would get worse.
How do you open a high pressure valve? - ANSWER Very slowly
A measure of a solution's ability to dissolve or deposit calcium
carbonate often used as an indicator of the corrosivity of water the
difference between actual pH(measured) and calculated pH. - ANSWER
Langelier Saturation Index
What hardness is most difficult to remove? - ANSWER Magnesium
Noncarbonated
,What equipment is needed to feed chlorine dioxide? - ANSWER 1)
Existing chlorination system 2) Diaphragm pump 3) Solution Tank 4)
Mixer 5) Chlorine dioxide generating tower 6) Electrical controls
The taste and odor of the water is a problem. What could make it worse?
- ANSWER Colored water from algae
Where is the beveled edge on a V notch weir? - ANSWER On the
downstream side of a measuring weir
What does a Langlier Index of 3.0 indicate? - ANSWER Scale Forming
Very short period for chemical to be dispersed. - ANSWER Flashmix
Accepted method of measuring turbidity - ANSWER Nephelometric
Selective destruction or inactivation of pathogenic organisms - ANSWER
Disinfection
The weights that will react with, displace, or is equivalent to one gram
of hydrogen - ANSWER Equivalent Weights
The appropriate place to store SCBA (Self-Contained Breathing
Apparatus) - ANSWER Outside the chlorine gas room
, A vertical empty space between a drinking water supply and an
unapproved water source used to prevent cross-contamination. It should
be twice the diameter of the pipe not to be less than 1 inch. - ANSWER
Air Gap
What are the components of a hypochlorite feed system? - ANSWER
1)Chemical solutioin tank for hypochlorite 2)Diaphram pump 3)Power
supply 4)Pressure switch 5)Water storage tank
Floc moving in a faster current in a tank or basin? - ANSWER Short-
Circuit
Crystalizes in cold weather aroung 50°F - ANSWER Caustic Soda (NaOH)
High head loss and the operator is washing filters but having short filter
runs. Turbidy is high. What is best corrective measure? - ANSWER Run
Jar Test to determine the best coagulant dosage
Measured by the amount of sulfuric acid required to lower the pH of
water to a level of 4.5 - ANSWER Alkalinity
The instrument used for measuring pressure. U-shaped tube partially
filled with fluid. - ANSWER Manometer
