Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
____________ are punishment for specific prohibited activities or acts of negligence, usually in
the form of fines.
a.)Actuary penalties
b.) Civil penalties
c.) Criminal penalties
d.) Retributory penalties - ✔✔✔-B
A 4-log inactivation, such as with viruses, is how much removal?
a.) 96%
b.) 99%
c.) 99.9%
d.) 99.99% - ✔✔✔-D
A direct water connection to a high hazard chemical feeder must be protected by a
a.) Reduced pressure zone back flow prevention valve assembly
b.) Single check valve assembly
c.) Dual check valve assembly
d.) Double check valve assembly - ✔✔✔-A
A disinfectant residual in the distribution system cannot be maintained if the only disinfectant
agent used is
a.) chlorine dioxide
b.) ozone
,Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
c.) a monochloramine
d.) free chlorine - ✔✔✔-B
A one-ton cylinder of chlorine gas has developed a small leak. The best action to take is to
a.) apply liquid lead putty over the leak area
b.) hose the cylinder off with cold water
c.) use a chlorine emergency repair kit to contain the leak
d.) read the Chlorine Institute Safety Kit - ✔✔✔-C
A perfectly uniform sand would have a uniformity coefficient of
a.) 0
b.) 1
c.) 1.5
d.) 1.7 - ✔✔✔-C
A tracer added to the clarifier influent is first detected in the effluent in 15 minutes and has
completely passed through the tank in 45 minutes. What does this indicate?
a.) Settling in this tank must be exceptionally good
b.) The tank is too large for the flow being treated
c.) This test has little or no meaning
d.) Flow is passing through the tank too quickly - ✔✔✔-D
,Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
All community public water systems serving more than 50 service connections and which have
their own source of water are required to install, operate, and maintain _____________
disinfection equipment.
a.) Duplicate
b.) Quadruple
c.) Single
d.) Triplicate - ✔✔✔-A
All of the following are possible causes of under dosing fluoride except
a.) careless lab procedures in testing for fluoride
b.) failure to verify the accuracy of the feeder calibration curve
c.) Incomplete mixing of dry chemicals ina dissolving tank
d.) higher than expected purity of fluorosilicic acid - ✔✔✔-D
All types of high-pressure cylinders must be properly restrained in order to
a. Prevent the formation of condensation on the cylinder
b. Prevent damage to the cylinder, which can result in the sudden release of its contents
c. Allow access by the operator
d. Allow identification of the chemical or gas in the cylinder. - ✔✔✔-B
All water quality samples submitted for microbiological examination at the proper state lab
must be examined no later than how many hours after collection?
a.) 12 hours
, Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
b.) 24 hours
c.) 30 hours
d.) 72 hours - ✔✔✔-C
Ammonia addition of water is used for
a. Increasing pH
b. Maintaining chlorine residual
c. Precipitating iron
d. Reducing corrosion - ✔✔✔-B
An operator of a treatment plant that uses the greensand filter process is receiving complaints
of brown or rust colored water. What can be done to correct this problem?
a.) Add sodium bisulfate to the effluent
b.) Decrease the detention time
c.) increase the permanganate dose
d.) Lower the pH by adding and acid - ✔✔✔-B
An operator receives frequent complaints of medicinal (phenolic) tastes in water coming from
the waterworks. What method of treatment would be used to correct this problem?
a.) Fluoridation
b.) chlorine dioxide
c.) Chlorine-ammonia
d.) Superchlorination and dechlorination - ✔✔✔-B
____________ are punishment for specific prohibited activities or acts of negligence, usually in
the form of fines.
a.)Actuary penalties
b.) Civil penalties
c.) Criminal penalties
d.) Retributory penalties - ✔✔✔-B
A 4-log inactivation, such as with viruses, is how much removal?
a.) 96%
b.) 99%
c.) 99.9%
d.) 99.99% - ✔✔✔-D
A direct water connection to a high hazard chemical feeder must be protected by a
a.) Reduced pressure zone back flow prevention valve assembly
b.) Single check valve assembly
c.) Dual check valve assembly
d.) Double check valve assembly - ✔✔✔-A
A disinfectant residual in the distribution system cannot be maintained if the only disinfectant
agent used is
a.) chlorine dioxide
b.) ozone
,Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
c.) a monochloramine
d.) free chlorine - ✔✔✔-B
A one-ton cylinder of chlorine gas has developed a small leak. The best action to take is to
a.) apply liquid lead putty over the leak area
b.) hose the cylinder off with cold water
c.) use a chlorine emergency repair kit to contain the leak
d.) read the Chlorine Institute Safety Kit - ✔✔✔-C
A perfectly uniform sand would have a uniformity coefficient of
a.) 0
b.) 1
c.) 1.5
d.) 1.7 - ✔✔✔-C
A tracer added to the clarifier influent is first detected in the effluent in 15 minutes and has
completely passed through the tank in 45 minutes. What does this indicate?
a.) Settling in this tank must be exceptionally good
b.) The tank is too large for the flow being treated
c.) This test has little or no meaning
d.) Flow is passing through the tank too quickly - ✔✔✔-D
,Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
All community public water systems serving more than 50 service connections and which have
their own source of water are required to install, operate, and maintain _____________
disinfection equipment.
a.) Duplicate
b.) Quadruple
c.) Single
d.) Triplicate - ✔✔✔-A
All of the following are possible causes of under dosing fluoride except
a.) careless lab procedures in testing for fluoride
b.) failure to verify the accuracy of the feeder calibration curve
c.) Incomplete mixing of dry chemicals ina dissolving tank
d.) higher than expected purity of fluorosilicic acid - ✔✔✔-D
All types of high-pressure cylinders must be properly restrained in order to
a. Prevent the formation of condensation on the cylinder
b. Prevent damage to the cylinder, which can result in the sudden release of its contents
c. Allow access by the operator
d. Allow identification of the chemical or gas in the cylinder. - ✔✔✔-B
All water quality samples submitted for microbiological examination at the proper state lab
must be examined no later than how many hours after collection?
a.) 12 hours
, Grade 4 Water Treatment Exam Prep with Questions and Answers – 100% Solved
b.) 24 hours
c.) 30 hours
d.) 72 hours - ✔✔✔-C
Ammonia addition of water is used for
a. Increasing pH
b. Maintaining chlorine residual
c. Precipitating iron
d. Reducing corrosion - ✔✔✔-B
An operator of a treatment plant that uses the greensand filter process is receiving complaints
of brown or rust colored water. What can be done to correct this problem?
a.) Add sodium bisulfate to the effluent
b.) Decrease the detention time
c.) increase the permanganate dose
d.) Lower the pH by adding and acid - ✔✔✔-B
An operator receives frequent complaints of medicinal (phenolic) tastes in water coming from
the waterworks. What method of treatment would be used to correct this problem?
a.) Fluoridation
b.) chlorine dioxide
c.) Chlorine-ammonia
d.) Superchlorination and dechlorination - ✔✔✔-B
