Texas Wastewater Operator Class B Exam Prep FREE Sample Exam

Which groups does the wastewater licensing and registration framework establish qualifications for?

Only companies operating facilities on contract, with individual operators outside the framework

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Treatment operators and the laboratories that test their samples, with collection operators outside the framework

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Domestic wastewater treatment facility operators, wastewater collection system operators, and companies operating these facilities on contract

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Only individual treatment facility operators, with companies and collection operators outside the framework and free of its qualification requirements

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What is the lowest license the operator in charge of a shift at a Category B facility may hold?

Class B

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Class A

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Class D

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Class C

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Why does the Class B operator recognize a need for adequate pretreatment of industrial wastes?

It reduces treatment costs and protects the domestic wastewater collection and treatment system

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It allows the plant to stop monitoring industrial discharges, since pretreatment is verified once at the source

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It transfers the plant's permit limits, and the liability for meeting them, to the industrial users themselves

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It eliminates the need for preliminary treatment at the plant, because industrial wastes arrive already treated

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A large interceptor runs surcharged, and a camera survey shows only murky water with no view of the bottom, yet the crew must know how much sediment the line is carrying before planning cleaning. What tool answers the question, and how?

A smoke test, which escapes through cracks above the sediment and outlines the depth of the deposit on the ground surface over the line for the crew to mark out

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A sonar profiler floated through the submerged line, which maps the sediment surface below the waterline so the deposit depth and volume can be measured

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A mandrel, which is pulled through the surcharged line and gauges the sediment by the drag it creates

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A dye trace, which colors the sediment so its depth can be read through the water from the manhole

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During a hot spell, a primary clarifier develops rising black solids and a sour odor at the surface a few hours after each sludge draw, even though the draw itself runs thick. Flows and loads are normal for the season. What operating change addresses the cause?

Draw sludge less often so each draw removes a larger, more completely digested mass of solids and accept the floating solids as a normal feature of warm-weather operation

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Add chlorine to the clarifier surface each afternoon to suppress the odor where it is noticed

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Slow the collector mechanism so the settled sludge is disturbed less between draws

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Increase the withdrawal frequency so settled sludge spends less time decomposing in the warm blanket before removal

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A utility’s exposure-control program for collection and treatment crews includes more than gloves and washing stations. Which additional protective measure belongs in such a program?

Requiring every worker to take a daily preventive antibiotic for as long as he or she continues to work in and around raw wastewater

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Rotating workers out of wastewater duties every month so no one accumulates any disease exposure

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Testing the wastewater weekly for pathogens and suspending all work whenever any are detected

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Offering workers immunization against sewage-borne diseases appropriate to their exposure, alongside hygiene and protective equipment

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A grade check on a new sewer reach reads an upstream invert elevation of 412.36 feet and a downstream invert elevation of 409.88 feet. The surveyed horizontal distance between the two manholes is 640 feet. First find the fall from the two elevations, then work out the grade. What is the slope of the reach, in percent?

0.31 percent

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3.88 percent

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0.04 percent

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0.39 percent

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An air-driven RBC has slowed noticeably, its film is thickening, and effluent quality is slipping. The air header pressure reads normal at the blower, but the drive cups along the media periphery are coated and partly filled with growth and debris. What is the proper response?

Clean the fouled drive cups and verify air delivery at the unit, restoring the buoyant drive force the cups provide as they fill and rise

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Convert the unit to a larger electric drive, because air drive cannot be restored once the cups have fouled in service, and the finding is recorded on the operating log for follow-up on the next round.

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Slow the other RBC units to match this one, because equal rotation speeds matter more than reaching the design speed, since leaving it uncorrected only lets the underlying problem grow worse with time.

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Raise blower pressure well above its normal range until the fouled cups are forced to perform like clean ones again

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A plant’s sludge volume index has climbed for two weeks. The settleability test shows slow settling with a clear supernatant, and microscopic examination shows long filaments extending from floc to floc, holding the particles apart. What does this combination establish?

The sludge is simply too old and should be wasted heavily until the index falls

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Filamentous bulking, confirmed by the bridging filaments

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Dispersed growth from a toxic discharge is preventing floc from forming at all

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The clarifier is hydraulically overloaded and the biology is not involved

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After a new industrial discharge begins, the plant laboratory finds the influent chemical oxygen demand has risen sharply while the biochemical oxygen demand is nearly unchanged, and aeration performance on the added load is poor. What does the widening gap between the two tests indicate?

The biochemical test bottles must be broken, because the chemical test always reads exactly twice the biochemical result on any wastewater

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The added load is mostly inert grit, because grit is the one material that raises chemical demand without raising biochemical demand

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The industrial discharge is easier to treat than sewage, because a load the biology ignores passes through without consuming any oxygen anywhere, so no pretreatment inquiry is warranted by these results

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Much of the added load is chemically oxidizable but poorly biodegradable, so the biological process cannot be expected to remove it like ordinary sewage strength

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An ultraviolet disinfection system shows normal lamp intensity and recently cleaned sleeves, but effluent coliform counts jump on the same afternoons the final clarifier carries solids over its weirs. What is the most probable cause?

The lamps have reached the end of their rated life and no longer emit germicidal wavelengths

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The ultraviolet transmittance of the water has fallen because of a dissolved color change upstream

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Suspended solids in the effluent are shielding organisms from the ultraviolet light as they pass the lamps

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The flow has dropped so low that the lamps are overheating and shutting down between samples

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A belt press crew keeps raising the polymer dose because the cake looks wet. The feed floc has become slick and gelatinous, free water runs poorly off the gravity section, and cake solids are getting worse rather than better. What should they reconsider?

The belt speed is too slow, because a press that holds sludge longer on the gravity section always produces a wetter cake

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The sludge is overconditioned: excess polymer is making the floc slippery and blinding drainage, so a lower dose may dewater better

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The wash water pressure is too high, because hard washing is known to dissolve polymer floc and release the water it had captured

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The feed solids are too thick, because thick feed is the one condition under which added polymer stops working entirely

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

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