Water Treatment Plant Operator UPDATED
Exam Questions and CORRECT Answers
Alum - CORRECT ANSWER What is used as a chemical coagulant?
Coagulation, Flocculation, Sedimentation and Filtration - CORRECT ANSWER The
correct order of treatment in a surface water plant is...
Jar - CORRECT ANSWER In determining the proper dosage of alum, the most useful test
is the____________ test.
Turbidity - CORRECT ANSWER If sludge is not continually removed from the
sedimentation basin, its accumulation results in?
Aluminum sulfate - CORRECT ANSWER The most widely used coagulant is....
Gentle Agitation - CORRECT ANSWER Optimum flocculation requires:
Turbidity - CORRECT ANSWER Dissolved iron in excessive amounts results in
consumer complaints about:
Turbidity - CORRECT ANSWER The most important raw water constituent for a surface
water plant is....
Suspended materials - CORRECT ANSWER Turbidity in water is cause by the presence
of.....
Coagulant dosage - CORRECT ANSWER The main purpose of the jar test is to determine
the best:
,Decreasing the rate of chlorine withdrawal - CORRECT ANSWER The formation of
chlorine ice affects chlorine feed rate. This can be prevented by:
157F-162F - CORRECT ANSWER The fusible metal plug on a chlorine cylinder is
designed to open at what temperature range?
spacer ring in a pump packing gland - CORRECT ANSWER A lantern ring is a....
Sand boils - CORRECT ANSWER When backwashing a filter, the backwash valve should
be opened slowly to prevent....
down to the hydraulic grade line - CORRECT ANSWER Suction lift refers to the pressure
difference between the center line of the pump....
Trihalomethanes - CORRECT ANSWER Prechlorination of raw water can lead to an
interaction of chlorine with organic matter which can form?
To remove turbidity - CORRECT ANSWER What is the main purpose of the coagulation
and flocculation process?
Velocity, water temperature, detention time and coagulant dosage - CORRECT
ANSWER What conditions most affect coagulation performance?
Filter effluent turbidity - CORRECT ANSWER What would be the best indicator that the
filter should be backwashed?
proper backwashing - CORRECT ANSWER The most crucial element of effective filter
performance is...
Ca(OCI)2 - CORRECT ANSWER What is the chemical formula for calcium
hypochlorite?
, The running average of quarterly samples during the previous 12 months exceeds the MCL. -
CORRECT ANSWER A violation of the MCL for total trihalomethanes occurs when?
pH of 10, optimum range is pH of 5 - CORRECT ANSWER What would the pH of water
be that had the highest concentration of hypochlorous acid?
Sodium chloride solution or NaCL - CORRECT ANSWER What is the solution used to
regenerate a zeolite softening unit?
Corrosiveness - CORRECT ANSWER Langelier's index is used to determine
Caustic Soda AKA Sodium Hydroxide - CORRECT ANSWER An effective chemical to
raise pH is....
Calcium Carbonate and Magnesium Bicarbonate - CORRECT ANSWER Minerals that
cause an increase in alkalinity are?
Increase in sodium content - CORRECT ANSWER A problem related to ion exchange
softeners is?
Phosphorous - CORRECT ANSWER In a reservoir, the main water constituent that
encourages algae growth is?
Air pressure - CORRECT ANSWER A bubbler measures water level by sensing
Bacteria - CORRECT ANSWER The primary contaminant that is important to public
health is?
Exam Questions and CORRECT Answers
Alum - CORRECT ANSWER What is used as a chemical coagulant?
Coagulation, Flocculation, Sedimentation and Filtration - CORRECT ANSWER The
correct order of treatment in a surface water plant is...
Jar - CORRECT ANSWER In determining the proper dosage of alum, the most useful test
is the____________ test.
Turbidity - CORRECT ANSWER If sludge is not continually removed from the
sedimentation basin, its accumulation results in?
Aluminum sulfate - CORRECT ANSWER The most widely used coagulant is....
Gentle Agitation - CORRECT ANSWER Optimum flocculation requires:
Turbidity - CORRECT ANSWER Dissolved iron in excessive amounts results in
consumer complaints about:
Turbidity - CORRECT ANSWER The most important raw water constituent for a surface
water plant is....
Suspended materials - CORRECT ANSWER Turbidity in water is cause by the presence
of.....
Coagulant dosage - CORRECT ANSWER The main purpose of the jar test is to determine
the best:
,Decreasing the rate of chlorine withdrawal - CORRECT ANSWER The formation of
chlorine ice affects chlorine feed rate. This can be prevented by:
157F-162F - CORRECT ANSWER The fusible metal plug on a chlorine cylinder is
designed to open at what temperature range?
spacer ring in a pump packing gland - CORRECT ANSWER A lantern ring is a....
Sand boils - CORRECT ANSWER When backwashing a filter, the backwash valve should
be opened slowly to prevent....
down to the hydraulic grade line - CORRECT ANSWER Suction lift refers to the pressure
difference between the center line of the pump....
Trihalomethanes - CORRECT ANSWER Prechlorination of raw water can lead to an
interaction of chlorine with organic matter which can form?
To remove turbidity - CORRECT ANSWER What is the main purpose of the coagulation
and flocculation process?
Velocity, water temperature, detention time and coagulant dosage - CORRECT
ANSWER What conditions most affect coagulation performance?
Filter effluent turbidity - CORRECT ANSWER What would be the best indicator that the
filter should be backwashed?
proper backwashing - CORRECT ANSWER The most crucial element of effective filter
performance is...
Ca(OCI)2 - CORRECT ANSWER What is the chemical formula for calcium
hypochlorite?
, The running average of quarterly samples during the previous 12 months exceeds the MCL. -
CORRECT ANSWER A violation of the MCL for total trihalomethanes occurs when?
pH of 10, optimum range is pH of 5 - CORRECT ANSWER What would the pH of water
be that had the highest concentration of hypochlorous acid?
Sodium chloride solution or NaCL - CORRECT ANSWER What is the solution used to
regenerate a zeolite softening unit?
Corrosiveness - CORRECT ANSWER Langelier's index is used to determine
Caustic Soda AKA Sodium Hydroxide - CORRECT ANSWER An effective chemical to
raise pH is....
Calcium Carbonate and Magnesium Bicarbonate - CORRECT ANSWER Minerals that
cause an increase in alkalinity are?
Increase in sodium content - CORRECT ANSWER A problem related to ion exchange
softeners is?
Phosphorous - CORRECT ANSWER In a reservoir, the main water constituent that
encourages algae growth is?
Air pressure - CORRECT ANSWER A bubbler measures water level by sensing
Bacteria - CORRECT ANSWER The primary contaminant that is important to public
health is?
