Water Distribution Class IV Exam Prep FREE Sample Exam

Why does a water-age limit act as a binding constraint on a production schedule, even when a cheaper way to run the sources is available?

Stored water loses quality as it ages, so storage must be cycled even when holding it longer would cost less

Correct Incorrect Correct answer

Older water raises the pumping head in every main in the system, which is why the age limit must be enforced daily

Correct Incorrect Correct answer

The age limit is what determines the correct size of customer service lines

Correct Incorrect Correct answer

Water age is recorded only because it is needed for customer billing

Correct Incorrect Correct answer

A peak-shaving plan depends on a transfer section with a flow area of 1.85 square feet carrying water at 3.62 feet per second. What flow rate, in gallons per minute, does that section deliver?

About 3,006 gpm

Correct Incorrect Correct answer

About 2,405 gpm

Correct Incorrect Correct answer

About 3,607 gpm

Correct Incorrect Correct answer

About 1,503 gpm

Correct Incorrect Correct answer

A hydraulic model predicts adequate pressures in a zone, but field gauges there read much lower. What is the directing operator’s first response?

Approve replacement of the zone's oldest mains on the strength of the model alone, without any field check

Correct Incorrect Correct answer

Verify field conditions first, checking for a closed valve, bad data, or changed demand

Correct Incorrect Correct answer

Raise production until the model prediction and the field readings happen to match

Correct Incorrect Correct answer

Lower the zone's pressure target so the existing readings comply on paper

Correct Incorrect Correct answer

A new rectangular ground reservoir is 24 ft long, 15 ft wide, and 8 ft deep. What is its volume in gallons?

21,542.4 gal

Correct Incorrect Correct answer

18,240 gal

Correct Incorrect Correct answer

25,118 gal

Correct Incorrect Correct answer

15,980.5 gal

Correct Incorrect Correct answer

A well pump delivers 480 gpm against 135 ft of head at 75 percent efficiency. What brake horsepower must the motor supply?

16.36 hp

Correct Incorrect Correct answer

25.90 hp

Correct Incorrect Correct answer

18.42 hp

Correct Incorrect Correct answer

21.82 hp

Correct Incorrect Correct answer

At a program audit, a booster station’s feeder delivers 34.7 lb/day into a flow of 2.05 MGD. What dose is the station actually applying?

1.73 mg/L

Correct Incorrect Correct answer

2.44 mg/L

Correct Incorrect Correct answer

16.9 mg/L

Correct Incorrect Correct answer

2.03 mg/L

Correct Incorrect Correct answer

What makes a sampling site representative when a program is redesigned for a grown system?

It is the site easiest for the sampler to reach each morning, and no follow-up sampling or verification is needed afterward

Correct Incorrect Correct answer

It reflects the water actually delivered to a real service area, including its age and flow conditions

Correct Incorrect Correct answer

It is any hydrant, since all distribution water is identical

Correct Incorrect Correct answer

It is the site closest to the treatment plant, where water is freshest, regardless of what the rest of the system's monitoring shows that month

Correct Incorrect Correct answer

During a quality response, a station feeds a flow of 1.45 MGD at a chlorine dose of 4.2 mg/L. How many pounds per day are applied?

60.9 lb/day

Correct Incorrect Correct answer

42.3 lb/day

Correct Incorrect Correct answer

50.77 lb/day

Correct Incorrect Correct answer

6.09 lb/day

Correct Incorrect Correct answer

How do grab samples and continuous analyzers complement each other in a monitoring program?

Grab samples are only for training new operators

Correct Incorrect Correct answer

Analyzers show the pattern between visits at one location, while grab samples verify analyzer accuracy and cover the wider system

Correct Incorrect Correct answer

Analyzers make grab sampling unnecessary at every location

Correct Incorrect Correct answer

Grab samples calibrate themselves against the analyzer automatically because it has been the utility's long-standing practice in similar cases

Correct Incorrect Correct answer

A validated top-down water audit shows real losses dominate the system’s losses, but it cannot say where in the system the water is escaping. What program step should be directed next?

Fund additional leak repair crews evenly across every district at once, and record that decision in the program file for the next scheduled review

Correct Incorrect Correct answer

Use district metering and night-flow analysis to locate where real losses are concentrated before committing repair resources

Correct Incorrect Correct answer

Raise the apparent-loss program's funding, since its work is better understood, while noting the choice in the quarterly program report sent to utility leadership

Correct Incorrect Correct answer

Set a lower loss target and wait for the next annual audit to clarify the picture, and leave the underlying program arrangements unchanged for the rest of the operating year

Correct Incorrect Correct answer

Pumping energy cost $132,000 of a distribution operating budget totaling $300,000 for the year. What percent of the operating budget is pumping energy?

22%

Correct Incorrect Correct answer

56%

Correct Incorrect Correct answer

44%

Correct Incorrect Correct answer

13.2%

Correct Incorrect Correct answer

A flood forces one of the system’s two sources out of service for at least two days during a high-demand week, while storage is near normal. What is the directing operator’s first plan-level action?

Activate the emergency response plan, shifting zones and storage to the remaining source under its pre-set priorities

Correct Incorrect Correct answer

Ask customers system-wide to stop all outdoor use indefinitely, with no end condition stated and no review date set, until someone remembers to lift the request

Correct Incorrect Correct answer

Wait for storage to fall to its lowest level before changing any system operations

Correct Incorrect Correct answer

Continue the routine plan unchanged because the remaining source is still producing water

Correct Incorrect Correct answer

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

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

5. Question

6. Question

7. Question

8. Question

9. Question

10. Question

11. Question

12. Question

Programs

Company

Legal

Account