Texas Wastewater Operator Class C Exam Prep FREE Sample Exam

An applicant for the Class C wastewater treatment facility operator license asks whether the computer-based examination is offered in any language besides English. What is the correct answer?

A Spanish-language form of the Class C wastewater examination is available

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No wastewater examination at any level is offered in any language besides English, and no translated form is planned

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A Spanish form exists only for the entry-level treatment examination

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A Spanish form exists only for collection system examinations

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An operator discovers late in a shift that a discharge result has exceeded a permit limit. What is the appropriate management response?

Promptly notify the chief operator and the responsible management chain, and document what was found

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Wait and mention it in the monthly summary if it happens again

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Adjust the recorded result during the next reporting cycle so the report stays within the limit without drawing attention to the event

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Say nothing, because a single exceedance has no consequences

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Where does the pH of typical raw domestic wastewater usually fall?

Strongly acidic, well below the neutral point at all times, because household wastes are dominated by acids from cleaning and cooking

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Near neutral, generally in a slightly alkaline to neutral range

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Strongly alkaline, comparable to cleaning solutions

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Exactly at the neutral point in every community served

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Run-time meters at a duplex station show one pump has logged nearly all the hours for months while the other has barely run, though levels and alarms are normal. What should the operator suspect first?

The alternator is no longer swapping the lead role

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The wet well is too small for the inflow

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Both discharge check valves are leaking back

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The standby pump's impeller is clogged with rags

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How does an operator check how much sludge has accumulated in the digestion compartment of an Imhoff tank?

By lowering a probe or weighted line through the gas vent area until it meets the sludge layer

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By reading the sludge level directly off the graduated scale mounted beside the settling compartment's effluent weir

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By measuring the thickness of the scum blanket floating on the surface of the settling compartment each morning

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By timing exactly how long the sludge draw valve runs open during a routine draw-off and converting that to depth

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Before a worker enters a deep manhole, the air is tested at several depths rather than at one level. Why?

The meter reads more accurately once it has taken several samples

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Testing at several depths stirs the air in the space and clears out any bad gas before the worker goes down

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Gases settle or rise by density, so a safe reading at one level can hide a deadly layer at another

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Each run of the ladder counts as a separate confined space to test

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A channel section carries a flow of 9.87 cubic feet per second through a flow area of 2.3 square feet. What is the velocity of the wastewater, in feet per second?

22.70 feet per second

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0.23 feet per second

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4.94 feet per second

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4.29 feet per second

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A plastic-media trickling filter sat drained and uncovered through a long, sunny outage. When work resumes, several top modules crack and crumble at their edges as they are lifted. What happened to the media?

The film that dried on the modules turned into a hard mineral crust during the outage, and what looks like damaged plastic is only crust that will soften once the bed is rewetted

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Ultraviolet exposure during the long uncovered outage degraded the exposed plastic, leaving it brittle; the damaged modules must be replaced

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The modules absorbed pond water while drained and swelled, and they will return to full strength once rewetted

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Birds nesting in the bed pecked the module edges apart, and screening the bed is the only repair required

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At a small activated sludge plant, the waste sludge line plugs with settled solids every few weeks, usually discovered at the start of a wasting cycle. What routine practice prevents this?

Waste a much larger volume once a month instead of small amounts often, and then return to the normal wasting schedule as soon as the line clears

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Flush the waste line with water at the end of each wasting cycle so solids do not sit and thicken in it

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Leave the waste valve cracked open so the line never sits full

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Heat the waste line so the sludge stays thin

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How is a sample collected for chemical oxygen demand analysis protected until it can be run?

It is frozen solid in a plastic bag

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It is left open on the laboratory bench overnight so the sample can equilibrate with the air before the digestion begins

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It is acid-preserved and refrigerated so the oxidizable material does not change before analysis

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It is mixed with chlorine to hold its strength

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A large plant’s chlorinators demand more gas than the ton containers can vaporize on their own; container shells frost and feed falters at high demand. What equipment addition solves this?

A booster fan to blow warm room air across the containers all day

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A second dechlorination feed pump on the discharge line

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A larger contact basin to store chlorine against peak demand

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An evaporator that heats liquid chlorine for high gas rates

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An operator fills a sand drying bed nearly to the boards with liquid digested sludge in one application, and weeks later it is still wet and odorous underneath. What application practice was violated?

In a shallow lift that can drain, dry, and crack in reasonable time

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Sludge should be applied only on rainy days so the surface stays soft

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Sludge should be mixed with filtrate to keep it liquid longer

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Sludge should be applied over the previous cake to save removal labor

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

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