Water Treatment Class I Exam Prep FREE Sample Exam

In a conventional surface-water plant, which step immediately follows flocculation in the normal treatment train?

Filtration through a rapid sand bed

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Sedimentation in a clarification basin

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Disinfection in a chlorine contact tank

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Storage in a finished-water clearwell

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Water flows through a channel with a cross-sectional area of 3 square feet at a velocity of 2 feet per second. What is the flow in gallons per minute?

6.00 gpm

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1,346.40 gpm

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5,385.60 gpm

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2,692.80 gpm

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What distinguishes a solids-contact clarifier from a conventional clarifier?

It removes the need for any coagulant chemical because solids alone destabilize colloids

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It settles solids only by spinning the water at high speed in a cylindrical steel tank

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It combines mixing, flocculation, and clarification together inside a single unit

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It filters water through a sand bed before any flocculation or settling can take place

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Which features protect a finished-water storage tank or clearwell from contamination?

Screened vents and a screened, flap-covered overflow pipe

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Open vents and an overflow pipe left unprotected at the top

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Unlocked hatches and lighting left off around the tank site

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Cracked coatings and standing water pooled on the tank roof

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A presence/absence test comes back positive, and a supervisor asks how many coliform organisms the sample contained. What is the correct response?

The count can be estimated reasonably well from how quickly the test changed color after incubation

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A positive result always means the count exceeded one thousand

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The test cannot say; it only shows presence, so a quantitative method would be needed

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The number can be read from the turbidity of the incubated sample

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Hardness in water is caused mainly by which dissolved minerals?

Sodium thiosulfate and DPD

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Iron and aluminum sulfate

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Calcium and magnesium

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Natural organic matter and algae

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Inline turbidimeters, chlorine analyzers, and pH meters require which routine attention?

Calibration only when a reading looks unusual

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No calibration after installation

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Calibration with finished water only, never standards

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Routine calibration against standards

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Calculate the water horsepower for a pump delivering 500 gpm against 100 ft of head.

50.51 hp

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25.25 hp

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12.63 hp

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6.31 hp

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After cleaning battery terminals on a backup system, what step protects against repeat corrosion and poor contact?

Leave the connections finger-tight so they can be removed quickly by hand

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Paint the cable ends the same color so either cable fits either terminal

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Wrap the terminals in dry rags to keep dust from settling on the bare metal

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Tighten connections securely and apply a protective coating to the terminals

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A raw-water sample is cloudy and measures high in turbidity. Turbidity is classified as which type of characteristic?

A physical characteristic

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A biological characteristic

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A chemical characteristic

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A radiological characteristic

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Raw water turbidity entering a presedimentation step is 48 NTU and the settled water leaving it is 6 NTU. What is the percent removal?

87.50%

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12.50%

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42.00%

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77.78%

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A tanker arrives with a chemical delivery the plant was expecting. What should happen first?

The driver checks in, the delivery is verified, and staff direct the unloading process

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The driver unloads wherever the hose reaches while staff finish their other rounds

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The driver is given a plant key so future deliveries can be made without checking in

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The driver drains the remaining heel of the last product into the new storage tank

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Water Treatment Class I Exam Prep FREE Sample Exam — Fixed Set

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