California Water Treatment T3 Exam Prep FREE Sample Exam

Raw-water storage that has sat nearly full through many days of very low demand holds water whose age has grown. The recognized operator control on that stored water’s age is to

seal the storage vents and hatches so the aged water cannot be affected by air

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keep the oldest water stored indefinitely, because stored raw water improves with age and should be drawn only in a genuine emergency, since age alone guarantees it stays at its best

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drain the entire storage to waste at once regardless of the quality the water shows

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manage draw and refill to turn the storage over, and check the aged water's quality as it is brought back into regular use

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A pressure gauge at the base of a raw-water tank reads 47.3 psi. How many feet of water stand above the gauge?

20.48 ft

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94.60 ft

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109.26 ft

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142.85 ft

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Dissolved iron in well water causes red water and rust-colored staining only after it is oxidized. What does oxidation convert, and into what?

Ferric iron Fe3+ is converted to ferrous iron Fe2+, which precipitates as a clear solid

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Ferrous iron Fe2+ is converted to ferric iron Fe3+, which precipitates as ferric hydroxide, the rust-colored solid removed by filtration

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Elemental iron is converted directly to manganese dioxide by the oxidant feed

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Ferrous iron Fe2+ is converted to a soluble ferric complex that can never be filtered out of the water by any filter the plant operates now or later

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In a pH-series at a fixed dose, the middle-pH jars form large floc and clear supernatant, while the lowest- and highest-pH jars stay cloudy with pinpoint floc. What does the series show?

The dose is too low at every pH tested, so pH control has no bearing on the result

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The jars were mixed unevenly during the test, so the whole series should be discarded

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The coagulant performs only inside a favorable pH range; hold plant pH there

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The highest pH is the best one to run, because its floc appeared to form the fastest

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A filter runs at 587 gpm for a run lasting 13.7 hours before it is backwashed. How many gallons does the filter produce during the run?

482,514 gal

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402,095 gal

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563,520 gal

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8,042 gal

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For the same basin, how does lowering the surface overflow rate affect settled-water quality?

Clarification improves, because more particles settle faster than the overflow rate

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Clarification gets worse, because water that stays in the basin longer always carries more floc over

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Nothing changes at all, because settling in a basin depends on the depth of the water alone

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Only the weir loading changes with flow; particle removal from the basin is unaffected

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Beyond closing out individual repairs, what does a complete work-order history let a chief operator do?

Prove that every repair was someone else's fault, which is the history's main use when a budget is questioned and the use the auditors ask about when the history is reviewed each year

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Replace the need for preventive maintenance, because a well-kept history stops equipment from failing in the first place

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See repeat failures and wear patterns building, predict which assets are heading for failure, and justify overhaul or replacement before the failure picks the timing

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Set chemical doses, since past repair records show what the raw water will demand next season

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A pump delivers 743 gpm against a total head of 157 ft, and the pump efficiency is 79%. What is the brake horsepower the driver must supply?

29.46 hp

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23.27 hp

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44.19 hp

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37.29 hp

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Correct alkalinity titration practice calls for reading the starting buret meniscus at eye level. What error does this prevent?

A reading error from viewing the meniscus at an angle, which would misstate the acid volume used

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Evaporation of titrant from the buret tip while the reading is being taken

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Neutralization of the standard acid by the glass of the buret barrel

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Formation of an air bubble in the buret tip during the titration

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In multiple-tube fermentation, the completed phase is used under which circumstance?

On every sample, as the first step performed before the presumptive broth is inoculated

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Only when the presumptive tubes show no gas, to prove that the sample was truly negative

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As a substitute for the confirmed phase whenever the laboratory is short on confirmatory media

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When full confirmation is required, using further plating and transfer beyond the confirmed phase

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What percent removal corresponds to a 2-log removal?

90 percent removal

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99 percent removal

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99.9 percent removal

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20 percent removal

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What does administering a plant safety plan mean in practice?

Filing the written plan and reviewing it only after a serious injury occurs at the plant, including during nights, weekends, holidays, and periods when the plant is operating short-staffed

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Keeping it current, training staff to it, auditing compliance, investigating incidents, and revising it

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Assigning the plan to a single operator so other staff do not need to know its contents

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Copying another plant's plan so the facility does not have to develop its own procedures

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California Water Treatment T3 Exam Prep FREE Sample Exam — Fixed Set

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