Water Distribution Class III Exam Prep FREE Sample Exam

Every tank is full, demand is moderate, and pressures at low-elevation services are climbing above the normal working range while hilltop pressures remain comfortable. What adjustment should the senior operator make?

Reduce the feed into the low area and trim production until pressures return to the normal range

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Start another booster pump so the low area has even more water available

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Open a tank drain and waste water until the low-elevation pressures look better

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Take no action at all, because high pressure simply means customers have plenty of water and pressure can never be too high in a distribution system

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To measure how much water a district actually uses overnight, an operator isolates the district so its tank is the only supply, holds all pumps off for a timed period, and records the tank level drop and the tank dimensions. What does this test determine?

The C-factor of the oldest main in the district, from the speed of the level drop

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The specific capacity of the well that normally feeds the tank during the day

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The pressure that will be available at the highest service in the district during the next fire event

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The district's actual flow rate over the test period, from the volume that left storage

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To plan a turnover cycle, a senior operator will draw a storage tank holding 297,000 gallons at an average rate of 550 gpm. How long will it take to exchange that volume at that draw rate?

About 9.0 hours

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About 5.4 hours

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About 18.0 hours

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About 540 hours

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A repaired main section is ready for its post-repair flush. From which direction should flushing flow be moved through the section?

From the repaired section outward into the clean system on both sides

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From a clean, unaffected part of the system toward and past the repair, carrying debris out at the discharge point

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From the nearest dead end back toward the repair, to save water

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Direction does not matter as long as the velocity is high

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A station pump delivers 480 gpm against 142 feet of head at 72 percent efficiency. What brake horsepower must the motor supply?

About 17.2 hp

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About 12.4 hp

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About 33.2 hp

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About 23.9 hp

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Pipe and fittings for a repair were disinfected early in the shift, then left open and uncovered in the trench while the crew was pulled to an emergency, returning the next morning to dusty, open pipe ends. Before assembly, what must happen?

The parts may be assembled as disinfected, because the previous day's chlorine treatment remains effective on the surfaces

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Only the pipe ends need a freshwater rinse, since dust on an interior surface flushes out harmlessly at startup

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The parts must be scrapped and replaced with new stock, because once disinfected parts sit overnight they cannot be re-treated

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The parts must be cleaned and disinfected again immediately before they are assembled

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What is the purpose of routine maintenance on chemical feed equipment in a distribution disinfection program?

To allow longer intervals between residual samples, since maintained feeders cannot drift, even though the same approach has not corrected it before

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To keep feeders, lines, and injectors clean and calibrated so the applied dose stays accurate and uninterrupted

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To document equipment age for the asset inventory, with no effect on dosing accuracy

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To reduce chemical usage by intentionally restricting the maximum feed rate of each pump

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A station treats 0.72 MGD and must apply a dose of 1.8 mg/L using a product that is 65% available chlorine. How many pounds of product must be fed per day?

10.81 lb/day

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7.02 lb/day

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16.63 lb/day

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21.55 lb/day

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A repaired main has been disinfected and flushed, and the first bacteriological set is satisfactory. A supervisor presses to return it to service before the second set to restore a detour route sooner. What should the senior operator do?

Return it to service; one clean set is enough when traffic is waiting, and treat the result as settled without further checking

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Hold it out of service until the second consecutive satisfactory set is in hand

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Return it but tell customers not to drink the water

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Skip sampling and rely on the chlorine residual instead

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In a planned traffic control setup, what is the purpose of the open buffer area between the end of the taper and the start of the actual work area?

It gives an errant or slow-stopping vehicle room to stop or recover before reaching the crew and the excavation

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It is the designated place to park the crew truck and stage pipe where it is closest to the trench

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It is extra pavement kept clear so flaggers can step back and talk with the crew between traffic cycles

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It is a storage lane for signs and cones that will be needed when the closure is taken down at the end of the day

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A distribution maintenance budget totals $300,000 for the year. The meter change-out program accounts for $51,000 of that budget. What percent of the maintenance budget does the meter change-out program represent?

5.9%

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17.0%

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20.5%

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83.0%

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A program evaluation shows the testing compliance rate has dropped sharply over two quarters. Review finds the assemblies were installed and inventoried correctly, but reminder notices were mailed to outdated addresses copied from an old billing list, and many owners never learned their tests were due. What is the correct program fix?

Extend every affected assembly's testing due date by a full additional year to clear the backlog, and suspend new notices in that area until the following cycle

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Record the untested assemblies as passing for this cycle so the compliance rate returns to normal

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Begin formal enforcement proceedings against all of the affected property owners at the same time

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Correct the address records against current account data and reissue the notices with a new deadline

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Water Distribution Class III Exam Prep FREE Sample Exam — Fixed Set

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