Texas Water Operator Class B Exam Prep FREE Sample Exam

Which set of articles may a candidate use during a Class B computer-based test?

Personal notes, a programmable calculator, and a cell phone kept face down on the desk

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A textbook, scratch paper supplied by the candidate, and a smart watch worn on the wrist

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A pencil or pen, scratch paper provided by the proctor, and a non-programmable calculator

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A dictionary, a translator device, and a programmable calculator borrowed from the center

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Before an analyst uses a new laboratory reagent for the first time, what precaution does the safety program require?

Testing a drop of the reagent on a small skin area first to check whether it causes any reaction or irritation

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Asking a coworker whether the reagent seemed strong last time

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Reviewing the reagent's safety data sheet for its hazards, handling, and first-aid information

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Diluting the reagent by half so it is safer to handle

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A chief operator is assigning a week’s distribution work: a main repair, routine flushing, meter change-outs, and a storage inspection assist. What supervision principle governs the assignments?

Any available employee may be assigned any of the tasks if the chief operator is busy with other duties elsewhere in the system

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Tasks are matched to each worker's license and competence, with the chief directing and checking subordinate operators' work

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The most senior employee chooses their own tasks and supervises themselves

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Contract crews need no direction once their contract is signed

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Which verification duty belongs to the Class B chief operator before system reports leave the plant?

Verifying that sampling results, records, and report entries agree before the report is signed and submitted

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Checking that only the final summary page is retained and that all supporting records are discarded as soon as the report is filed

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Signing reports prepared by others without reviewing the underlying entries

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Having an unlicensed trainee reconcile any differences found in the entries

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After a well starts, the discharge runs milky white, then clears from the bottom of a sample glass upward within a minute or two. What is the chief operator actually looking at?

Fine silt passing the screen that must be filtered out at the plant

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Precipitated hardness forming because the water was warmed in the line, based on the readings recorded in the current operating log

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Chlorine gas coming out of solution because the dose is set too high

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Entrained air entering through the well or suction side and escaping from the water

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A Class D operator wants to change a coagulant feed at a surface plant. When may the operator make that adjustment?

Whenever the shift log shows a turbidity change

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Only after routine weekly approval from any operator while keeping the current settings in place until the next scheduled staff review meeting is held

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Only when a Class C or higher surface water operator is present and has issued specific instructions

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At any time if the chief is reachable by phone

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A groundwater system sees a rising pattern of pinhole leaks in customer plumbing and red-water complaints, while its wells produce water the laboratory describes as unstable and corrosive. As chief operator, what program response is appropriate?

Advise customers that pinhole leaks are a private plumbing matter only

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Increase distribution flushing frequency across the whole system and consider the matter addressed for the year

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Direct a corrosion investigation tying corrosiveness measurement of the source water to a control strategy

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Replace the system's oldest water mains on an emergency basis

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Why can an elevated storage tank maintain distribution pressure during a period when no pumps are running?

The tank's altitude valve pumps water uphill into the distribution system

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Water stored at elevation flows by gravity, and its height provides the pressure in the system below it

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The tank's overflow pipe pressurizes the mains whenever the pumps stop for any length of time during the day or night at the station

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Compressed air in the tank expands and pushes water into every main at once

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Trihalomethane results are trending upward while distribution residuals are compliant. A staff operator proposes cutting the plant dose below what holds the far-point minima. What does the chief operator direct instead?

Approve the cut, because by-product results outrank the minimum residual requirements and the far points can be allowed to run below their minima during the warm months of the year, provided the entry point residual is checked weekly and the change is noted in the operating log

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Control formation on the precursor and exposure side, through treatment that removes organic precursors, chlorine optimization, and reduced water age, while still holding every required residual minimum

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Stop disinfecting on weekends so the weekly average dose falls, and make up the lost disinfection by feeding a larger dose on Mondays when the plant staff returns to work

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Dilute the finished water with an undisinfected purchased supply at the edge of the system to lower the measured by-products, and report the blended results as the system's own

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In the plant laboratory, what does ultraviolet absorbance measured at 254 nanometers on a raw-water sample chiefly indicate for the chief operator?

A surrogate measure of aromatic organic matter — the precursor load that drives coagulant demand and by-product formation potential

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A direct count of coliform organisms in the sample, obtained from the light those organisms absorb as the beam passes through the cell

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A direct measure of the sample's hardness, obtained from the calcium and magnesium that absorb the beam in proportion to their concentration

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A direct measure of the sample's turbidity, reported in the same units a nephelometer produces when it reads scattered light instead

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Which setup correctly expresses percent removal across a treatment step?

Percent removal equals the outlet value divided by the inlet value, times 100 while keeping the current settings in place until the next scheduled staff review meeting is held

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Percent removal equals inlet minus outlet, with no comparison to the inlet

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Percent removal equals the drop from inlet to outlet, divided by the inlet value, times 100

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Percent removal equals the inlet value divided by the drop, times 100

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A plant treats 0.83 MGD and applies a dose of 2.35 mg/L. How many pounds of chemical per day are required?

13.02 lb/day

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16.27 lb/day

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19.51 lb/day

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1.95 lb/day

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Texas Water Operator Class B Exam Prep FREE Sample Exam — Fixed Set

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