Water Treatment Class IV Exam Prep FREE Sample Exam

A residuals discharge is scheduled, but the effluent quality from the residuals stream has degraded and releasing it now would exceed the permit limits that govern that discharge. What should the operator in charge do?

Release it during a period of high receiving-water flow so dilution keeps the exceedance from being noticed

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Release half now and half later so each release looks smaller

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Release it at night when the discharge is least likely to be sampled

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Hold and manage the residuals on site until the discharge can meet its permit limits

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A day tank feeds 585.5 lb/day of coagulant product (taken as 100% chemical for this check) while the plant treats 3.9 MGD. What dose is actually being delivered?

9.0 mg/L

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1.8 mg/L

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27.0 mg/L

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18.0 mg/L

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Over several weeks a membrane train needs steadily rising transmembrane pressure to hold its flux as fouling builds. What is the proper operating response sequence?

Hold the pressure where it is and let the train run at rising pressure until it can no longer produce its share of plant flow

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Use backpulse to restore recovery during operation and schedule chemical cleaning as the pressure trend continues

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Defeat the pressure alarms so the trend stops interrupting operations

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Swap the train's feed to the permeate header to reverse the fouling

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To avoid starting a fourth train, operators have run three trains well above design flux for months. Cleanings are now needed far more often and run lengths keep shrinking. What is the root problem and the correction?

The membranes have reached end of life together; replace all three trains at once

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Sustained over-flux is fouling the trains faster; return to design flux by using all trains and storage as intended

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The cleaning chemical has weakened in storage; order fresh chemical at the same strength and keep the same flux schedule

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Raw water quality has worsened; raise the coagulant dose until the run lengths recover

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Raw water enters treatment at 210 color units and finished water leaves at 18.9 color units. What percent of the color was removed?

82%

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95%

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91%

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86%

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Which laboratory measurement distinguishes a chloramine-decay problem from a dosing problem in a chloraminated system?

Total alkalinity at the plant effluent tap

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Free ammonia at the affected distribution sites

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Raw-water turbidity at the intake structure

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Finished-water hardness leaving the clearwell

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A routine check shows the control system’s backup power batteries can no longer carry the PLC and instruments for their rated time. What is the correct maintenance action?

Leave them in place, because controls draw almost no power during an outage

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Test them again in a year to confirm the decline is real before spending money for the record

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Replace or restore the batteries promptly, before an outage tests them in service

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Remove the batteries so a weak set cannot drag down the control voltage

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A discharge gauge on a booster pump reads 58 psi during an efficiency test. How many feet of head does this represent?

125.4 ft

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145.5 ft

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134.0 ft

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115.5 ft

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Heavy algae growth noted during a reservoir inspection warns the operator to expect which combination at the plant?

Taste and odor complaints, higher daytime pH, and shorter filter runs

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Lower raw-water pH at midday and steadily lengthening filter runs

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Falling iron and manganese with no change in raw-water turbidity

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Rising well yields and a falling demand for coagulant chemicals

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A utility-sponsored household hazardous-waste collection day supports source water protection mainly by doing what?

Testing each resident's well water while chemicals are dropped off

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Giving residents a proper disposal route for chemicals kept at home

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Replacing the watershed protection plan with a one-day cleanup event

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Removing sediment that has accumulated in the raw-water reservoir

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A plant’s annual operating budget is $625,000, and $187,500 has been spent by the end of the first quarter review. What percent of the operating budget has been expended?

33.33% of the budget

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70.00% of the budget

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30.00% of the budget

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25.00% of the budget

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Preparing an annual evaluation, a supervisor realizes the file holds only notes from a difficult incident last month, though the operator performed well most of the year. What should the supervisor do?

Write the evaluation around the incident because it is best documented

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Give the operator the same rating as last year to avoid the missing data

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Reconstruct the full-year record from logs and notes before evaluating

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Skip the evaluation this year because the documentation is incomplete

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Water Treatment Class IV Exam Prep FREE Sample Exam — Fixed Set

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