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2024 GRADE 4 WATER TREATMENT EXAM PREP WITH CORRECT ANSWERS
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2024 GRADE 4 WATER TREATMENT EXAM PREP WITH CORRECT ANSWERS
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2024 GRADE 4 WATER TREATMENTEXAM PREP WITH CORRECT
ANSWERS
When there is insufficient alkalinity present in water to react with the
coagulant, alkalinity should be supplied by
a.) Adding Lime
b.) Adding Turbidity
c.) Reducing plant flow
d.) Removing carbon dioxide - CORRECT-ANSWERSA
Chlorine dioxide is generated on-site by the reaction of chlorine with what
chemical?
a.) Oxygen
b.) Sodium Chlorite
c.) Salt Brine
d.) Carbon - CORRECT-ANSWERSB
Which one of the following statements about ozone is false?
a. It is an oxidizing agent
b. It must be generated at its point of use
c. It is a reducing agent
d It is fed as a gas - CORRECT-ANSWERSC
In a pumping station where two complete pumping units are provided, how
much should a pump be capable of delivering?
a.) Average Flow
b.) Maximum Flow
c.) 1/2 the average flow
d.) 1/2 maximum flow - CORRECT-ANSWERSA
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. - CORRECT-
ANSWERSB
Which of the following chemicals can be used for corrosion control in water
treatment?
a. Lime, alum, and permanganate
b. Soda ash, activated carbon, and fluoride
c. Phosphate compounds, caustic soda, and alum
d. Phosphates, lime, and soda ash - CORRECT-ANSWERSD
The most favorable raw water condition for good coagulation with alum is
a. High pH, high alkalinity
b. High pH, low alkalinity
c. Low pH, High alkalinity
d. Low pH, low alkalinity - CORRECT-ANSWERSC
What is the best pH range for coagulating water?
a. 2-5
b. 3-10
c. 5-7
d. 7-10 - CORRECT-ANSWERSC
Which of the following offers the highest level of protection against back
flow?
a. Air gap
b. Dual independent check valves
c. Reduced-pressure back flow preventer
d. Vacuum breaker - CORRECT-ANSWERSA
Why must the horizontal pipes holding the air diffuser all be at the same
elevation?
a. To release air into the aerator evenly
b. To taper the release of air into the aerator
c. To prevent clogging of the diffusers
d. To promote complete mixing aeration. - CORRECT-ANSWERSA
Which of the following is added to the water to increase both pH and
alkalinity?
a. Carbon dioxide
, b. Lime
c. Chlorine
d. Fluoride - CORRECT-ANSWERSB
Contamination of domestic water distribution lines is best prevented by
a. An active cross-connection prevention program
b. Cutting off service to a violator of the rules
c. Use of uv light source on all new water
d. use of a zone pressure system - CORRECT-ANSWERSA
How are tastes and odors from phenolic compounds affected by chlorination?
a. Unaffected
b. Eliminated
c. Decreased
d. Increased - CORRECT-ANSWERSD
If the free chlorine residual falls below the minimum allowed in a system
using grab sampling in lieu of continuous monitoring, how often must the
system take a grab sample until the free chlorine residual concentration is
equal or greater than the minimum allowed?
a. Every hour
b. Every 2 hours
c. Every 4 hours
d. Every 12 hours - CORRECT-ANSWERSc
If sodium fluoride solution is used in water containing hardness greater than
75 mg/L as CaCo3, which of the following is recommended?
a. Total hardness be increased by the lime-soda ash process or ion-exchange
method
b. Make-up of the water be softened
c. Hydroflurosilicic acid is substituted
d. Hydrofluorosilicic acid can be used and diluted - CORRECT-ANSWERSB
Cascade aeration is used to treat a groundwater source in an enclosed
building. What possible contaminant could cause a risk to a plant personnel?
a. Calcium carbonate
b. Iron
c. manganese
d. Radon - CORRECT-ANSWERSD
Granular activated carbon will last longer when used to adsorb
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