Texas Wastewater Operator Class A Exam Prep FREE Sample Exam

What is the time limit for the Class A wastewater treatment facility operator computer-based examination?

Three hours, the same default limit that governs the other wastewater examinations

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Five hours, two hours longer than the default limit for the other wastewater exams

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Six hours, the only six-hour examination among the wastewater examinations

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Four hours, one hour longer than the default limit for the other wastewater exams

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A resident submits a request for the utility’s discharge reports and correspondence. What is the proper handling?

Route it through the designated records custodian, who responds under the utility's records procedures

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Decline the request, because operating records are internal documents

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Ask the resident to obtain the records from a neighboring utility instead

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Have each shift search its own files and send whatever each shift happens to find directly to the resident

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A chief operator wants to know how much of a district’s flow is infiltration rather than sanitary use. Which measurement best isolates it?

Measure the district's flow in the small hours of the night, when legitimate sanitary use is at its lowest, and treat the base flow that remains as largely infiltration

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Compare the district's billed water consumption with its population, and estimate the infiltration share by judgment from the difference between the two figures

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Measure the district's flow at the evening peak, when sanitary use by homes and businesses is at its highest point of the day, and treat the peak as the infiltration figure

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Measure the district's flow during the first storm of the wet season, while the ground is still dry, and treat everything above the dry-day average as infiltration

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A lift station serving a restaurant district short-cycles through the night and twice overflowed with pumps proven sound. Divers find a thick grease mat floating on the wet well, with the floats embedded in it. What is the chief-level response?

Raise the pump-on float so the mat passes under it before the pumps are called to start

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Fix the sensing failure with mat-resistant level measurement and attack the source through the grease-control program for food establishments

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Add a third pump so the station can out-pump the level swings the mat creates

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Dose the wet well with hot water weekly so the mat melts and flows to the plant and repeat the dosing after every weekend, when restaurant discharge is at its heaviest for the whole week

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Why are mechanically cleaned bar screens, rather than hand-raked screens, the standard choice at a large treatment plant’s headworks?

They eliminate the need for grit removal, because the rake grinds trapped grit fine enough to pass downstream harmlessly

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They use no electrical power, because the wastewater flow itself drives the raking mechanism at all plant flow rates

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They remove a greater share of dissolved pollutants than hand-raked screens, because the moving rake stirs the wastewater as it cleans

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They clean continuously and automatically, sustaining screening capacity through storms and debris surges that would overwhelm manual raking

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A chief training attendants on pre-entry testing should teach that the atmosphere is tested in what order, and why?

Oxygen first, because low oxygen threatens the entrant directly and skews the readings of the other sensors

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Hydrogen sulfide first, because it is the gas most often present in wastewater spaces and for that reason it is always measured before any other gas in any space the department enters

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Combustible gas first, because an explosion would injure the whole entry crew at once

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Carbon monoxide first, because it is colorless and gives the entrant no warning at all

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A sludge facility treats a flow of 13.7 MGD with a polymer dose of 2.7 mg/L. The same report lists a thickener diameter of 55 ft, a cake solids content of 19 percent, and a filtrate flow of 0.4 MGD. How many pounds of polymer are fed per day?

308.50 lb/day

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369.90 lb/day

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274.12 lb/day

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36.99 lb/day

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A rock trickling filter has lost performance over years, and the choice is between treating the bed’s surface and excavating the media. What diagnostic should decide it?

Core down through the bed at several points and examine the media with depth, so the renewal matches how far the fouling and breakdown actually extend

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Judge by the bed's surface alone from the walkway, because the condition of the top layer reliably shows the condition of the whole depth of media below it

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Judge by the filter's age alone, because every rock bed of the same age is fouled to the same depth regardless of its loading history

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Judge by effluent quality alone over one week, because a single week's results separate surface fouling from deep breakdown every time

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A large treatment facility runs conventional activated sludge, a mode other than extended aeration or an oxidation ditch, and its flow is greater than 10.0 million gallons per day. How is the facility classified?

It is a Category A facility — the top classification at this flow

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Category B, because only extended aeration systems can reach the top category

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Category C, because conventional activated sludge is capped in the middle categories

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Category D, because the treatment mode rather than the flow sets the category

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A plant laboratory opens a new lot of an ammonia test reagent, and from that day every ammonia result, influent and effluent alike, reads noticeably higher while plant operations have not changed. Before any process adjustment is made, what is the soundest laboratory judgment?

Raise aeration without delay, because higher ammonia readings in the plant must always be taken at face value

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Average the new results together with last week's figures to smooth the transition from one lot to the next

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Report the higher values as measured and simply note the lot change in the laboratory file without checks

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Suspect the new lot, verify it against a known standard, and hold process decisions until the shift is explained

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For a disinfection expansion at a very large plant, the chief operator is comparing gas chlorine with the liquid alternatives. Which comparison is correct?

Gas chlorine carries the lowest hazard of the chlorine forms and the least emergency-planning burden of any disinfectant the plant could choose for the expansion

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Gas chlorine generally offers the lowest unit chemical cost at large scale, balanced against the greatest storage hazard and emergency-planning burden

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Liquid hypochlorite is always cheaper than gas chlorine once a plant reaches very large flows

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All chlorine forms impose identical safety programs, so cost is the only real difference

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A large plant’s anaerobic digester develops a thick foam layer and carries solids into the gas line shortly after the waste activated sludge share of the feed was sharply increased. What is the most defensible chief-level response?

Shut the digester down and landfill its contents, because foaming always means the vessel is ruined

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Raise digester temperature quickly to burn the foam layer off the surface

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Add large volumes of water to wash the foam down into the digester contents

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Meter the feed increase back gradually and control the foam, because a sudden load of filament-rich sludge is a recognised foaming trigger

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Texas Wastewater Operator Class A Exam Prep FREE Sample Exam — Fixed Set

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