Water Treatment Class II Exam Prep FREE Sample Exam

Over several weeks a membrane unit shows declining flux and rising transmembrane pressure at the same flow. What does this indicate?

The membranes are becoming cleaner with use

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Fouling is building up on the membranes

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Recovery has improved beyond its design value

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The permeate quality has stopped mattering

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Raw water entering an iron-removal filter contains 2.0 mg/L of iron, and the filter effluent contains 0.10 mg/L. What is the percent removal?

95%

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5%

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90%

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50%

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A membrane rack is held at a steady flux, but its transmembrane pressure has climbed steadily for two weeks while permeate quality stays normal. What does this trend call for?

An integrity test, because the fibers must be broken

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A higher operating flux to push through the fouling layer

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Chemical cleaning, because fouling is building up on the membranes

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No action, because permeate quality has not changed yet

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Why are storage tank levels deliberately cycled up and down in a chloraminated system?

To exercise the altitude valve once each shift

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To keep the tank as full as possible at all times

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To reduce detention time, which otherwise drives residual loss and nitrification

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To increase the pressure and storage available to the system during hours of peak demand

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Lab results show a process stream entering at 85 mg/L TSS and leaving at 5 mg/L TSS. What is the percent removal?

80.0%

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94.1%

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5.9%

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17.0%

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The designated distribution sampling tap is locked inside a closed building, so the sampler collects from a garden hose bib next door instead. Why is that sample unacceptable?

Hose bibs always contain much more chlorine than regularly flushed service taps, so the sample would show a falsely high residual and hide any problem

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Samples must come from the cold-water kitchen tap only

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The laboratory cannot analyze water collected outdoors

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Distribution samples must come from representative, regularly flushed service taps at designated sites — not hoses or substitute fixtures

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A high-service pump delivers 1,188 gpm against 75 ft of head. What is the water horsepower?

22.5 hp

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18.0 hp

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28.1 hp

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30.0 hp

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A pump delivers 600 gpm against 150 ft of head at 75% efficiency. What brake horsepower must the motor supply?

22.7 hp in most plants

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17.0 hp

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30.3 hp

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45.5 hp

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A SCADA chlorine reading has not changed at all for hours while plant flow and dose have varied. What is the best interpretation?

The sensor or signal has likely failed and shows a frozen value

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The process is perfectly stable, so no field check is needed

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The chlorine dose should be doubled until the reading moves again

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The contact basin has suddenly gained extra baffling efficiency

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A long dry forecast shows demand staying high while reservoir inflow stays near zero. The best release plan is to:

Release at the normal rate until storage is nearly empty

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Hold all water and supply the system from wells only

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Pace releases against forecasted demand and remaining storage so the supply lasts through the dry period

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Release extra water now to lower the pool before drought

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How do wellhead protection areas restrict activities around a well?

They ban all pumping within a fixed distance of every well in the area

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They restrict activities by groundwater travel-time zones

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They apply only to surface reservoirs, never to groundwater well fields

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They restrict activities based on the age of the pump motor in the well

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A contractor crew arrives to work near chemical storage. What is the supervisor’s best action before work starts?

Assume the contractor's own company has covered all plant hazards fully

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Brief the crew on plant hazards, safety rules, and emergency actions

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Let the crew start and correct any unsafe practice if it is noticed later

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Limit the briefing to parking and break areas to keep the crew on schedule

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

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