1|Page
WATER TREATMENT GRADE 2 EXAM NEWEST 2025/2026 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED||
In a typical air-scour sequence, air is applied ____________
backwash water is introduced. - answer-before
What is the filtration flow rate through a high-rate mixed media
filter? - answer-3-8 pm/ft^2
Which system is the first and oldest type of underdrain system,
having a central manifold pipe with perforated lateral pipes on
each side? - answer-pipe lateral collectors
Which regulation requires that all filters in a surface water
treatment plant have online turbidimeters, and that they monito
the filter while it is in operation? - answer-ieswtr
Prehistoric deposits of the skeletal remains of microscopic aquatic
plants and elements are the source of what useful filtering
element? - answer-diatomaceous earth
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The advantage to using the oxidant ozone is that it - answer-has
little ph effect
Pretreatment with chlorine is being eliminated at many water
treatment plants because it has been shown to - answer-
sometimes produce disinfection by-products known to be
carcinogenic
C x t values are based on - answer-concentration of chlorine,
contact time, ph, and temperature
Which index determines the calcium carbonate deposition
property of water by calculating the saturation ph, where a
negative value indicates corrosive water - answer-langelier
saturation index
Which type of chlorine gas feeder is most commonly used? -
answer-vacuum
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Which device(s) uniformly disperse(s) the chlorine solution into
the main flow of water - answer-diffusers
The pressure in a chlorine cylinder depends on the_______ -
answer-temperature of the chlorine liquid
Chlorine cylinders and ton containers are equipped wit valves,
which must comply with standards set by which organization? -
answer-the chlorine institute
What is an injector? - answer-a venture device that pulls chlorine
gas into a passing stream of dilution water, forming a strong
solution of chlorine and water
What is an evaporator? - answer-a heating device used to convert
liquid chlorine to chlorine gas
List four operating problems related to chlorination - answer-any
four o the following: chlorine leaks, stiff container valves,
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hypochlorinator problems, tastes and odors, sudden change in
residual, trihalomethane formation
Compared to air, how dense is chlorine gas? - answer-2.5 times
as dense
Which of the following would immediately occur if newly installed
manganese greensand was not skimmed of the fines after
backwashing and stratification steps we completed? - answer-
shorter filter runs
Manganese greensand filters can be regenerated by using -
answer-potassium permanganate solution during bckwashing
Wich material is manganese greensand and which is the coating -
answer-glauconite sand coated with manganese dioxide
Depending on water temperature, what is the typical backwashing
flow rate for a manganese greensand filter be? - answer-10-12
gpm/ft^2
WATER TREATMENT GRADE 2 EXAM NEWEST 2025/2026 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED||
In a typical air-scour sequence, air is applied ____________
backwash water is introduced. - answer-before
What is the filtration flow rate through a high-rate mixed media
filter? - answer-3-8 pm/ft^2
Which system is the first and oldest type of underdrain system,
having a central manifold pipe with perforated lateral pipes on
each side? - answer-pipe lateral collectors
Which regulation requires that all filters in a surface water
treatment plant have online turbidimeters, and that they monito
the filter while it is in operation? - answer-ieswtr
Prehistoric deposits of the skeletal remains of microscopic aquatic
plants and elements are the source of what useful filtering
element? - answer-diatomaceous earth
,2|Page
The advantage to using the oxidant ozone is that it - answer-has
little ph effect
Pretreatment with chlorine is being eliminated at many water
treatment plants because it has been shown to - answer-
sometimes produce disinfection by-products known to be
carcinogenic
C x t values are based on - answer-concentration of chlorine,
contact time, ph, and temperature
Which index determines the calcium carbonate deposition
property of water by calculating the saturation ph, where a
negative value indicates corrosive water - answer-langelier
saturation index
Which type of chlorine gas feeder is most commonly used? -
answer-vacuum
,3|Page
Which device(s) uniformly disperse(s) the chlorine solution into
the main flow of water - answer-diffusers
The pressure in a chlorine cylinder depends on the_______ -
answer-temperature of the chlorine liquid
Chlorine cylinders and ton containers are equipped wit valves,
which must comply with standards set by which organization? -
answer-the chlorine institute
What is an injector? - answer-a venture device that pulls chlorine
gas into a passing stream of dilution water, forming a strong
solution of chlorine and water
What is an evaporator? - answer-a heating device used to convert
liquid chlorine to chlorine gas
List four operating problems related to chlorination - answer-any
four o the following: chlorine leaks, stiff container valves,
, 4|Page
hypochlorinator problems, tastes and odors, sudden change in
residual, trihalomethane formation
Compared to air, how dense is chlorine gas? - answer-2.5 times
as dense
Which of the following would immediately occur if newly installed
manganese greensand was not skimmed of the fines after
backwashing and stratification steps we completed? - answer-
shorter filter runs
Manganese greensand filters can be regenerated by using -
answer-potassium permanganate solution during bckwashing
Wich material is manganese greensand and which is the coating -
answer-glauconite sand coated with manganese dioxide
Depending on water temperature, what is the typical backwashing
flow rate for a manganese greensand filter be? - answer-10-12
gpm/ft^2
