Alabama Grade IV Water Operator Exam
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
UFRV - CORRECT ANSWER Unit Filter Rate Volume
How can you remove truecolor? - CORRECT ANSWER Coagulation & Chlorination
Synura - CORRECT ANSWER Cucumber Smell
Normality - CORRECT ANSWER Equivalents of solute per liter of solution
Asterionella Pandorina Uroglenopsis - CORRECT ANSWER Fishy Smell
Anabaena Anacystis - CORRECT ANSWER Musty Pig-Pen Smell
A centrifugal pump works correctly for a period of time but begins to lose suction. What is
the problem? - CORRECT ANSWER Faulty Foot Valve
What is the effect of pH on chlorine disinfection? - CORRECT 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 - CORRECT 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. - CORRECT
ANSWER Slaking - Slaked lime is calcium hydroxide. Ca(OH)₂
,Why is weir balance important? - CORRECT ANSWER For uniform flow of water.
What do you do if floc is carring over? - CORRECT ANSWER Adjust the alum dose.
What would happen if you added water to a chlorine leak? - CORRECT ANSWER The
leak would get worse.
How do you open a high pressure valve? - CORRECT 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. - CORRECT ANSWER Langelier Saturation Index
What hardness is most difficult to remove? - CORRECT ANSWER Magnesium
Noncarbonated
What equipment is needed to feed chlorine dioxide? - CORRECT 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? - CORRECT
ANSWER Colored water from algae
Where is the beveled edge on a V notch weir? - CORRECT ANSWER On the
downstream side of a measuring weir
What does a Langlier Index of 3.0 indicate? - CORRECT ANSWER Scale Forming
Very short period for chemical to be dispersed. - CORRECT ANSWER Flashmix
, Accepted method of measuring turbidity - CORRECT ANSWER Nephelometric
Selective destruction or inactivation of pathogenic organisms - CORRECT
ANSWER Disinfection
The weights that will react with, displace, or is equivalent to one gram of hydrogen -
CORRECT ANSWER Equivalent Weights
The appropriate place to store SCBA (Self-Contained Breathing Apparatus) - CORRECT
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. - CORRECT ANSWER Air Gap
What are the components of a hypochlorite feed system? - CORRECT
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? - CORRECT ANSWER Short-
Circuit
Crystalizes in cold weather aroung 50°F - CORRECT 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? - CORRECT 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 -
CORRECT ANSWER Alkalinity
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
UFRV - CORRECT ANSWER Unit Filter Rate Volume
How can you remove truecolor? - CORRECT ANSWER Coagulation & Chlorination
Synura - CORRECT ANSWER Cucumber Smell
Normality - CORRECT ANSWER Equivalents of solute per liter of solution
Asterionella Pandorina Uroglenopsis - CORRECT ANSWER Fishy Smell
Anabaena Anacystis - CORRECT ANSWER Musty Pig-Pen Smell
A centrifugal pump works correctly for a period of time but begins to lose suction. What is
the problem? - CORRECT ANSWER Faulty Foot Valve
What is the effect of pH on chlorine disinfection? - CORRECT 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 - CORRECT 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. - CORRECT
ANSWER Slaking - Slaked lime is calcium hydroxide. Ca(OH)₂
,Why is weir balance important? - CORRECT ANSWER For uniform flow of water.
What do you do if floc is carring over? - CORRECT ANSWER Adjust the alum dose.
What would happen if you added water to a chlorine leak? - CORRECT ANSWER The
leak would get worse.
How do you open a high pressure valve? - CORRECT 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. - CORRECT ANSWER Langelier Saturation Index
What hardness is most difficult to remove? - CORRECT ANSWER Magnesium
Noncarbonated
What equipment is needed to feed chlorine dioxide? - CORRECT 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? - CORRECT
ANSWER Colored water from algae
Where is the beveled edge on a V notch weir? - CORRECT ANSWER On the
downstream side of a measuring weir
What does a Langlier Index of 3.0 indicate? - CORRECT ANSWER Scale Forming
Very short period for chemical to be dispersed. - CORRECT ANSWER Flashmix
, Accepted method of measuring turbidity - CORRECT ANSWER Nephelometric
Selective destruction or inactivation of pathogenic organisms - CORRECT
ANSWER Disinfection
The weights that will react with, displace, or is equivalent to one gram of hydrogen -
CORRECT ANSWER Equivalent Weights
The appropriate place to store SCBA (Self-Contained Breathing Apparatus) - CORRECT
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. - CORRECT ANSWER Air Gap
What are the components of a hypochlorite feed system? - CORRECT
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? - CORRECT ANSWER Short-
Circuit
Crystalizes in cold weather aroung 50°F - CORRECT 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? - CORRECT 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 -
CORRECT ANSWER Alkalinity
