Wastewater Collection Class II Exam Prep FREE Sample Exam

Camera work from the main shows a leaking tap connection, but a lateral camera pushed up the service line finds the lateral itself cracked and root-filled for most of its length. Why is a top-hat liner alone the wrong rehabilitation here?

A top-hat seals only the connection area and a short piece of lateral, leaving the damaged lateral unrepaired

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A top-hat liner can be installed only in manholes, so it can never be used at any lateral connection at all

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A top-hat would add so much thickness that the main would be blocked for its entire remaining length

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A top-hat requires the lateral to be in perfect condition at the connection, which is the opposite of this case

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Before a wet well is taken out of service for rehabilitation, the crew must know how much wastewater the well holds so it can be pumped down and hauled. The cylindrical wet well is 11 ft in diameter and holds a depth of 9 ft. What is its volume?

854.87 gal

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6,394.39 gal

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12,788.78 gal

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3,197.20 gal

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Two air tools must run at the same time from one compressor, and together they draw more air than the compressor can deliver at working pressure. What happens in operation, and what selection fixes it?

Working pressure holds steady, because pneumatic tools share a supply without any loss

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Both tools run noticeably faster than normal when they are fed from the shared supply

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Pressure falls and tools weaken; a larger-delivery compressor is needed

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The receiver tank alone makes up the whole difference for as long as the job continues

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Before a crew can repair a leaking tap, the exact position of the lateral where it meets the main must be confirmed in a yard crossed by other buried services. Which excavation approach best fits?

Open a wide trench with an excavator bucket across the whole yard so every buried service in the area is uncovered at once

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Probe blindly with a steel bar until the lateral is struck

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Hydro excavate a narrow exposure that daylights the tap and the nearby services

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Jet the main from inside and judge the tap position from the surface

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Flow in a trunk channel measures 24 cubic feet per second through a flow area of 3.0 square feet. What is the velocity?

0.13 ft/s

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72 ft/s

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4.0 ft/s

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8.0 ft/s

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A reach drops 2.1 ft over a run of 300 ft. What is the slope of the reach?

0.07%

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7.0%

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0.7%

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1.4%

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A lift station pump motor runs at full speed but the pump delivers no flow, and the condition began after the wet well was drawn down unusually low. What condition inside the pump best explains this?

The pump has become air-bound, with air trapped in the casing preventing it from moving liquid

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The force main has become too clean for the pump to work against

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The check valve has opened too far and cannot be slowed

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The wet well has gained volume while the pump was off

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Wastewater moves through a force main at 4.2 ft/s, and the pipe offers 1.5 square feet of flow area. How many gallons per minute pass a given point in the line?

About 2,827 gpm

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About 2,262 gpm

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About 3,392 gpm

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About 1,979 gpm

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What is the purpose of a deadband built into a SCADA level alarm setting?

It silences every alarm at the station automatically during the nighttime hours, on the assumption that no genuine emergency can develop while the crew is off site

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It keeps the alarm from chattering on and off when the level hovers right at the alarm point

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It delays every alarm by one full day so a supervisor can review it first

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It disconnects the level sensor whenever the measured level is holding steady

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Dry-weather flow from one basin has declined steadily for a year while customer counts and neighboring basins stayed stable. Which defect should the operator investigate?

The basin's manholes have begun taking in far too much storm water lately

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The treatment plant is drawing extra flow out of that basin every night

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Wastewater may be leaking out of the basin's pipes through defects — exfiltration — or being diverted before the meter

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The basin's residents are all using less water for no identifiable reason

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A repair will close one lane of a busy street for most of a day. What is the best traffic-control action?

Configure the plan and signs in advance, coordinate the detour with city or agency contacts, and brief the crew

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Place cones when the crew arrives and let traffic sort itself out, with drivers choosing whatever route around the work they prefer

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Close both lanes without notice to shorten the job

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Rely on the truck's flashing lights as the only traffic control

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A crew finds drums of unknown material dumped beside a manhole, with liquid pooled nearby. What is the best program response?

Have the crew open a drum to identify the contents by smell

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Load the drums onto the crew truck and haul them to the yard, where they can be stored until someone has time to look at them properly and decide

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Wash the pooled liquid into the manhole so the area looks clean

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Keep the crew back, secure the area, and coordinate the response through the program's hazardous-materials and emergency contacts

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Wastewater Collection Class II Exam Prep FREE Sample Exam — Fixed Set

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