Level 1 Water Distribution Practice Test 2023-2024 Questions and Answers 100%
Correct
The minimum and maximum chloride residual in a water distribution system is ? - ANSWER-0.2 mg/l and 4mg/L of free chlorine
Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - ANSWER-10 mg/L
The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? - ANSWER-The population served by the system
When a distribution bacteriological sample is positive for a total coliform the procedure is ? - ANSWER-Repeat the sample and take a sample 5 connections upstream and downstream to confirm total coliform
For lead and copper sample the water must be In the pipeline for at least? - ANSWER-6
hours
What is hydraulic grade line ? - ANSWER-A line to which the water level would rise in a small ,vertical tube,connected to the pipe
How often should cathodic protection anodes in your system be inspected? - ANSWER-
Every year
Water pipelines are generally designed to carry water at a velocity below ? - ANSWER-
2.5b FPS. Feet per second
Energy use in water systems is defined best by ? - ANSWER-Energy use varies among systems and an energy inventory study would need to be conducted to determine relationships
The minimum recommended separation distance between a water main and a storm sewer is ? - ANSWER-6 feet
Which of the following should be in an organization plan ? - ANSWER-Identifies clear lines ,defines the divisions of labor ,establishes unity of command
If pipelines are not restrained using steel rods concrete thrust blocks can be used at ? - ANSWER-Every bend and transition Engineering Drawings that show the depth of pipe, the pipe location both vertically and horizontally and the correct distance form a reference point are known as which of the following - ANSWER-Plan and profile drawings
Which are the components of directing staff ? - ANSWER-Motivating & communicating
The accuracy of large meters should fall within what range ? - ANSWER-Not less than 97% not more than 103%
In some older water system lead service line still exist. What would be the best practice when finding lead pipe ? - ANSWER-Be replaced
What is the acceptable range for water loss in a typical municipal distribution system that has a variety of pvc and di pipe ? - ANSWER-20% (80% effienciency)
What is a major cause of underground construction deaths ? - ANSWER-Lack of shoring or shoring failure
If the tds is marginally too high for the pump the likely result will be ? - ANSWER-
Decrease in flow rate
Air release valves are installed at what location in a water line ? - ANSWER-At high points of a pipe line
The maximum pressure at service connections should be less than ? - ANSWER-100 psi
In selecting and Evaluating a tank, storage capacity must be matched _______of the system ? - ANSWER-Peak demand
A hydraulic grade line will always slope in what direction ? - ANSWER-Slope downward in the direction of the water flow
Where does the majority of microbial growth with in a water distribution system occur ? -
ANSWER-Dead end water lines
Wells that are biologically contaminated from repeat coliform or fecal coliform must be bacteriologically surveyed and sample which is not correct ? - ANSWER-They must be at least 12 hours apart
When backfilling a pipe line how deep should the first layer of backfill be compacted - ANSWER-At the horizontal centerline of the pipe
What is an important step in problem solving - ANSWER-Realization that a problem still exist
Correct
The minimum and maximum chloride residual in a water distribution system is ? - ANSWER-0.2 mg/l and 4mg/L of free chlorine
Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - ANSWER-10 mg/L
The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? - ANSWER-The population served by the system
When a distribution bacteriological sample is positive for a total coliform the procedure is ? - ANSWER-Repeat the sample and take a sample 5 connections upstream and downstream to confirm total coliform
For lead and copper sample the water must be In the pipeline for at least? - ANSWER-6
hours
What is hydraulic grade line ? - ANSWER-A line to which the water level would rise in a small ,vertical tube,connected to the pipe
How often should cathodic protection anodes in your system be inspected? - ANSWER-
Every year
Water pipelines are generally designed to carry water at a velocity below ? - ANSWER-
2.5b FPS. Feet per second
Energy use in water systems is defined best by ? - ANSWER-Energy use varies among systems and an energy inventory study would need to be conducted to determine relationships
The minimum recommended separation distance between a water main and a storm sewer is ? - ANSWER-6 feet
Which of the following should be in an organization plan ? - ANSWER-Identifies clear lines ,defines the divisions of labor ,establishes unity of command
If pipelines are not restrained using steel rods concrete thrust blocks can be used at ? - ANSWER-Every bend and transition Engineering Drawings that show the depth of pipe, the pipe location both vertically and horizontally and the correct distance form a reference point are known as which of the following - ANSWER-Plan and profile drawings
Which are the components of directing staff ? - ANSWER-Motivating & communicating
The accuracy of large meters should fall within what range ? - ANSWER-Not less than 97% not more than 103%
In some older water system lead service line still exist. What would be the best practice when finding lead pipe ? - ANSWER-Be replaced
What is the acceptable range for water loss in a typical municipal distribution system that has a variety of pvc and di pipe ? - ANSWER-20% (80% effienciency)
What is a major cause of underground construction deaths ? - ANSWER-Lack of shoring or shoring failure
If the tds is marginally too high for the pump the likely result will be ? - ANSWER-
Decrease in flow rate
Air release valves are installed at what location in a water line ? - ANSWER-At high points of a pipe line
The maximum pressure at service connections should be less than ? - ANSWER-100 psi
In selecting and Evaluating a tank, storage capacity must be matched _______of the system ? - ANSWER-Peak demand
A hydraulic grade line will always slope in what direction ? - ANSWER-Slope downward in the direction of the water flow
Where does the majority of microbial growth with in a water distribution system occur ? -
ANSWER-Dead end water lines
Wells that are biologically contaminated from repeat coliform or fecal coliform must be bacteriologically surveyed and sample which is not correct ? - ANSWER-They must be at least 12 hours apart
When backfilling a pipe line how deep should the first layer of backfill be compacted - ANSWER-At the horizontal centerline of the pipe
What is an important step in problem solving - ANSWER-Realization that a problem still exist
