Grade 4 Water Treatment Exam Prep QUESTIONS WITH ANSWERS

Grade 4 Water Treatment Exam Prep |\ |\ |\ |\ |\ |\




QUESTIONS WITH ANSWERS |\ |\




In a pumping station where two complete pumping units are
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provided, how much should a pump be capable of delivering?
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a.) Average Flow
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b.) Maximum Flow
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c.) 1/2 the average flow
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d.) 1/2 maximum flow - CORRECT ANSWERS ✔✔A
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When there is insufficient alkalinity present in water to react with
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the coagulant, alkalinity should be supplied by
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a.) Adding Lime
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b.) Adding Turbidity
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c.) Reducing plant flow
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d.) Removing carbon dioxide - CORRECT ANSWERS ✔✔A
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Chlorine dioxide is generated on-site by the reaction of chlorine
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with what chemical? |\ |\




a.) Oxygen|\




b.) Sodium Chlorite
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,c.) Salt Brine
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d.) Carbon - CORRECT ANSWERS ✔✔B
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Why is carbon dioxide primarily used in the stabilization process?
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a.) Decrease pH
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b.) Increase pH
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c.) Tie up scale forming ions
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d.) Form a protective coating - CORRECT ANSWERS ✔✔A
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If fluoride is fed ahead of filtration what can occur?
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a.) Some fluoride loss
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b.) Problems with disinfection
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c.) Increases in fluoride concentration
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d.) Formation of precipitate - CORRECT ANSWERS ✔✔A
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Which of the following emergency leak repair kits should be on
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hand for ton cylinders?
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a.) Emergency Kit A
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b.) Emergency Kit B
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c.) Emergency Kit C
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d.) Emergency Kit D - CORRECT ANSWERS ✔✔B
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,What will iron that remains in the ferrous state do?
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a.) Be removed by filters
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b.) Pass through the filters
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c.) Precipitate in the reaction tank
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d.) Settle out - CORRECT ANSWERS ✔✔B
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Short circuiting in the flocculation process can be corrected by
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a.) Adjusting the pH
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b.) Decreasing the flows
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c.) Increasing coagulant dosages
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d.) Providing several compartments in series - CORRECT
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ANSWERS ✔✔D |\




What removes organic substances from depleted activated
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carbon?


a.) Degasification
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b.) Recarbonation
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c.) Reduction
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d.) Reactivation - CORRECT ANSWERS ✔✔D
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, What is the purpose of an anti-siphon valve on a fluoride
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metering pump? |\




a.) The same as that of the overflow connection on the supply
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b.) To prevent fluoridated water from being siphoned into the
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feed equipment |\




c.) To prevent potential overfeed of fluoride
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d.) The same as that of a vacuum breaker on the potable makeup
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water line - CORRECT ANSWERS ✔✔B
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A perfectly uniform sand would have a uniformity coefficient of
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a.) 0 |\




b.) 1 |\




c.) 1.5 |\




d.) 1.7 - CORRECT ANSWERS ✔✔C
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When handling any dry fluoride compound one important safety
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precaution that should be observed is to |\ |\ |\ |\ |\ |\




a.) Have another operator near by
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b.) Keep all windows closed to prevent the escape of dangerous
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dusts into the environment
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c.) Keep skin contact with fluoride dusts to a minimum
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d.) Use only explosion proof fixtures - CORRECT ANSWERS ✔✔C
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