Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

WATER DISTRIBUTION LEVEL 1 EXAM 2025/2026 LATEST QUESTIONS AND ANSWERS GRADED A+, Exams of Water Resources Planning and Management

WATER DISTRIBUTION LEVEL 1 EXAM 2025/2026 LATEST QUESTIONS AND ANSWERS GRADED A+ The minimum and maximum chloride residual in a water distribution system is ? 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? 10 mg/L The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? The population served by the system When a distribution bacteriological sample is positive for a total coliform the procedure is ? Repeat the sample and take a sample 5 connections upstream and downstream to confirm total coliform

Typology: Exams

2024/2025

Available from 06/17/2025

LennieDavis
LennieDavis 🇺🇸

793 documents

1 / 50

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
WATER DISTRIBUTION LEVEL 1 EXAM
2025/2026 LATEST QUESTIONS AND ANSWERS
GRADED A+
The minimum and maximum chloride residual in a water distribution system is ?
0.2 mg/l and 4mg/L of free chlorine
Nitrate may not exceed what concentration when tested yearly for a groundwater
treatment plant ?
10 mg/L
The minimum number of total coliform samples that must be collected per month
is based on Wich of the following ?
The population served by the system
When a distribution bacteriological sample is positive for a total coliform the
procedure is ?
Repeat the sample and take a sample 5 connections upstream and downstream to
confirm total coliform
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22
pf23
pf24
pf25
pf26
pf27
pf28
pf29
pf2a
pf2b
pf2c
pf2d
pf2e
pf2f
pf30
pf31
pf32

Partial preview of the text

Download WATER DISTRIBUTION LEVEL 1 EXAM 2025/2026 LATEST QUESTIONS AND ANSWERS GRADED A+ and more Exams Water Resources Planning and Management in PDF only on Docsity!

WATER DISTRIBUTION LEVEL 1 EXAM

2025/2026 LATEST QUESTIONS AND ANSWERS

GRADED A+

The minimum and maximum chloride residual in a water distribution system is?

0.2 mg/l and 4mg/L of free chlorine

Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant?

10 mg/L

The minimum number of total coliform samples that must be collected per month is based on Wich of the following?

The population served by the system

When a distribution bacteriological sample is positive for a total coliform the procedure is?

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?

6 hours

The chlorine dose added to water for disinfection is:

Demand plus residual

The sterilization of drinking water

is not necessary

Chlorine gas has what effect on the pH of water?

It lowers the pH

Disease causing bacteria are known as what?

Pathogenic

What is the recommended minimum contact time when disinfecting water mains with the C12 slug method?

Hard water

Low water temperature has what effect on the density of water?

Increases the density

T or F: All bacteria under the Total Coliform group are pathogenic

False

1 multiple choice option

T or F: The P/A test method will allow you to quantify the number of organisms per 100 mL of sample

False

1 multiple choice option

A positive to the Total Coliform test using the MPN method is indicated by:

Formation of gas bubbles

The action levels for lead and copper are based on:

90th percentile level of tap water samples

When changing gas chlorine cylinders, an operator should:

Do it with a buddy and have access to SCBA gear

Gas chlorine is closer to:

100% pure

What class of fire involves electrical equipment?

Class C

AD

What type of fire hydrants are usually seen in the movies sheared off and spraying?

Wet barrel

Fire hydrants should be installed how many feet back from the curb?

2 feet

When using a fire hydrant for construction, what should be used?

Corp stop and venturi meter

Which type of hydrant has no main valve and each nozzle has a valve?

Wet barrel

What type of hydrant is used in freezing climates?

Dry barrel

What happens if a dry barrel hydrant is not completely open or completely closed?

Weep hole leaks, causing problems

Where is the main valve located on a dry barrel hydrant

Underground

How far apart should hydrants be in commercial areas

Every 300 feet

If drainage is not possible with a dry barrel hydrant, you should

Combination or compound

When water flow enters the throat of a venturi meter, the water velocity:

Increases

A typical small flow meter will have this kind of valve right before it

Back flow valve

Cathodic protection is

An electrical system for the prevention of corrosion

What role does a storage tank play in the distribution system?

Equalizes Supply and Demand and Increase detention time

What is the main purpose of elevating a storage tank?

Pressure

What kind of tank maintenance is preferrable?

Preventative

What is the purpose of an air vent on a storage tank?

All the Above

AD

What causes corrosion in a metallic storage tank?

All the above

Which of the following characteristic of a pump is shown in a pump curve?

Efficiency

What type of motor is used when infrequent starting is required, and the load needs to be brought up to speed very quickly?

Capacitor-start

What type of pump has a rotating propellor

Axial-flow

What type of motor requires no windings and has low starting torque?

Split-phase

AD

The formation of trihalomethanes in water treatment is due to the reaction of chlorine with what?

Natural organics

The 3 types of water rights are:

Riparian, prescriptive, and appropriative

Surface water requires more treatment than ground water due to

Higher levels of organics

Reservoirs are stratified in three layers known as:

Epilimnion, metalimnion, and hypolimnion

What is the minimum flushing velocity when using the unidirectional flushing method?

5-7 fps

What type of pipe joint lacks flexibility and is not normally burried?

Flanged

What is the equation for Ohm's Law

V=Amps*Ohms

What is the unit of measurement used to express velocity in a water pipe?

FPS

A public water system using surface water must continuously monitor the disinfection residual entering the system if serving more than________?

It is essential to ventilate a vault before entering in order to?

Remove dangerous gasses and ensure proper oxygen levels

Calcium Hypochlorite comes in what form?

Tablets

What type of meter is usually 2" and under and is sensitive to low flow rates?

Positive displacement

If an employee is caught in a room where there is a chlorine gas leak and the employee does not have on a mask, what should the employee do?

All of the above

The proper emergency kit for a 150lb chlorine cylinder is?

Kit A

The pulling or stretching of a water pipe without breaking is known as its?

Tensile Strength

T or F: Never apply water to a gaseous chlorine leak because the water will cause more issues.

True

1 multiple choice option

Hydraulics is the Study of?

Fluids in Motion and at Rest

A sample taken that represents the water at particular time and place is?

Grab Sample

The arrangement of water pumps in parallel is typically used to?

Increase Flow

What is the term that defines the inactivation of pathogenic organisms in water?

Disinfection

How long can samples being tested for coliforms be refrigerated before analysis?

8 hours

Surge tanks in the water system are used for?

Eliminating water hammer and prevent pressure spikes