Water Distribution

Rising stem valves are used most often

When a bacteriological water sample comes back marked "positive" you should immediately

A connection between a safe and an unsafe water supply is

The number of distribution system samples that must be taken each month is based on

The primary reason for a dry barrel fire hydrant is

Positive displacement meters are the ______ and ______type

The typical daily water usage in gallons per capita per day (gpcd) is about

A new section of water main has series of things that must be done to it before completely backfilling and putting it into service. What is the proper order for doing them?

Shut-off valves in residential area should be located at least every

The average water loss )per AWWA) due to leakage in most systems is

Service lines that connect the consumer to the water system usually range from

There are several considerations to be taken into account when installing a routine bacteriological sample station. Out of the following, which would you choose?

The killing of pathogenic organisms is called

If you went to a customer's service to turn the water off (lock-off) for non-payment, the valve you would most likely use would be the

When operating valves there are two main problems that can occur (besides a stuck or broken valve). One is water hammer, the other is

When operating a dry barrel fire hydrant it is important to operate with the valve fully open to allow

Sodium thiosulfate neutralizes ______ in water samples.

When the flow into a reservoir is set about the same as the average demand then the reservoir is said to be

Water is considered to be ____ if it's chemical, physical, and bacteriological characteristics make it satisfactory for drinking.

Normally a distribution reservoir will contain _____hours of "peak period" demand.

The dafe yield for a well is the amount of water that can be pumped from the aquifer over period of time that includes

When pressure testing a new "CCCL" water main you should fill it first and wait at least

Dissolved iron in a public water supply system may cause

A system that uses a sealed tank that is partially filled with air that is compressed in order to supply water pressure to a service area is called a(n).

If a bacteriological sample cannot be analyzed within _____ it should be refrigerated.

"Force" is a problem with many valves used in a water system. A valve that is commonly used in larger sizes that does not suffer the effects of force is the

In waterworks terminology the word "residual" is used to describe

The USEPA sets primary and secondary standards for water. The primary standards are related to _____ and the secondary standards are related to __________.

The resistance to flow of water in a pipe is called

The use of meters on consumer services has led to

Air release valves are installed on the

Which of the following meters has no moving parts>

The term "water table" is used to describe

If source water contains toxic agents in it that make it hazardous, it is considerd

A venturi meter determines flow by comparing the pressure at the throat and a point just _____of the throat.

MCL stands for

Deposits in cast iron water mains are called

A high "C" factor number indicates that a pipe

A toxic substance is always

"Clear Wells" are used to store water from

When collecting a water sample for bacteriological testing, you should

Two conditions that could cause a backflow are

Positive pressure in the main is a

Any vertical wall trench ______ or deeper must be shored

The amount of pressure pushing downward on the outside of a pipe from the earth covering it is called

The use of wells in a distribution system can decrease the needs for

When drawing a bacteriological sample it is important not to

"Thrust" is a condition that will occur at

A gate valve

The "cone of depression" is the

Milky looking water is usually a result of

Consistent pressure in a distribution system reservoir

the longer water remains in a distribution reservoir

Cholera, typhoid, dysentery, and diarrhea are the most common

An altitude valve is used to

__________ is the most common method of well construction

The term "drawdown" is the elevation difference between the _______ and the ________.

When distribution valves are opened and closed rapidly

The AWWA recommends that 5/8 water meters be tested once every

The hardness of water is

The hydraulic grade line is the elevation _________ that water would rise to at a given point in a distribution system.

The carrying capacity of a water system can be improved by

_________ is the minimum pressure that should be allowed in a distribution system, even during fire fighting.

New service connections can be made on a "live" water line by making a

Globe style vavles (is Cla-Valves) are mainly used for

Pathogenic bacteria is considered

The main use of gate valves in the distribution system is for

How long does it take to get results for a Colilert bacteria test?

Small flow meters are usually displacement meters, and large flow meters are usually

Drinking water standards are categorized as

Concrete coated cement lined steel cylinder pipe is most commonly used for

Reservoir drains and overflows are plumbed

Water and sewer mains are installed

If a trench cannot be shored for some reason, then

After emergency repairs a water main can be chlorinated to _________ to reduce the required contact time to _________.

_________ is the preferred distribution disinfectant to aid in the control of THM's.

Large gate valves sometimes have a small by-pass installed around them. What is the purpose of this by-pass?

Aesthetic aspects of water deal with

Water mains are disinfected

AWWA standards require positive displacement meters to read

Pressure regulating stations are used to

The type of meter most commonly used for varying assemblies are

As a common practice, air release and vacuum valve assemblies are

"Hardness" in water is generally caused by

The "Zone of Influence" refers to the

A positive displacement meter is usually used on a service that has

When taking a bacteria (coliform) sample it is important that the operator

The AWWA has standards for accuracy requirements for new meters of various types. What are the accuracy requirements for a new positive displacement type meter at normal flow rates?

The resistance to flow of water in a pipe is called

In determining the purity of a water sample, it is usually tested for the presence of coliform bacteria because

The primary purpose of distribution system storage (reservoirs) is

The person in your department that is responsible for being sure that your department has a good record keeping system is

The maximum withdrawal rate from 150 lb chlorine cylinder is

The carry capacity of a water main can be reduced by

The primary reason to install a dry barrel type hydrant (other than fighting fires) is

A _______ type pump must never be started against a closed discharge valve.

You are to dig a trench about 4.5 feet deep to install a pipe in. As you are digging you find that the soil is very loose. You are unable to slope the trench due to near-by utilities. What will help you shore this type of trench?

As water meters age, they tend to

When installing new packing rings in a pump you should

The device installed on a pump shaft that causes the water to be (moved) forced out against the case is called the

When disinfecting a new water main, the chlorine residual must not drop below _______ for at least ________.

If a water sample cannot be analyzed within _______ it should be refrigerated.

The most frequently reported cause of waterborne disease in the U.S. is

A standard measurement of electrical power is the

The pressure exerted downward on a water line from the soil covering it is known as the

When testing for chlorine residuals, the reagent most used is

A new section of water line has been laid. Before it is completely backfilled and put into service, several things must be done. What is the proper order for doing them?

The results of a "grab" sample in a distribution system indicate

Your supervisor has instructed you to paint an existing pressure regulating station. You realize that this is a confined space and you know that you will have a problem with paint fumes. What will you do to protect yourself?

Combustible gas detectors have an 'LEL" (Lower Explosive Limit) alarm setting of ________.

When constructing a large well, the pump most used is a

Taste and odor problems are more noticeable

According to the AWWA, about ________ percent of potable water supplied to a distribution is unaccounted for (due to leaks, bad meters, etc.)

The difference between the amount of chlorine added and the residual detected at a given point downstream in the water distribution system is called the

Rising-stem valves are usually used

Dry barrel hydrants have their operating valves

To find the elevation of a pipe's "invert" (inside-bottom) an operator would

An example of a confined space would be a(n)

After the disinfection process on a new water main, bacteriological samples are drawn and the water main is put into service

You have a pump that raises water to a higher elevation reservoir. This pump has a normal discharge pressure of 115 psi and a normal flow of 2,300 gpm. On a routine check, you find that the pump has a discharge pressure of 162 psi and no flow. What would you suspect is the cause?

When talking about pumps, the term "semi-open" refers to _______ design.

While working in a chlorine station an operator got chlorine in his eyes, he should imediately

A piston pump operates on the _________ principal.

Some of all of the forces that a pump must operate against is known as

When entering a confined space, what % oxygen level is the minimum required for self contained breathing apprentice?

The killing of pathogenic organisms in water is called

When drawing a sample for bacteriological examination

Bacteria that are know to be disease causing are called

The chemical used most for disinfection of water in the U.S. is

Sodium hypochlorite is

Water bearing geological formation is called

One of the biggest problems with hyrogen sulfide gas is

If the speed of a positive displacement pump is varied then

The reducer installed in a centrifugal pump is called a

A Ventri meter detrims flow by measuring the pressure differencial

The most important reason to use a casing the first 50' feet of a well is

A valve that joins a customer to a water main is called a

The maximum suction lift from a centrifugal pump is

To determine is a sewer line crosses under or over a water line, you would look at

The bend or goose neck is put in a water service line to allow

In well terminology, the term draw down means

Compound meters are used on service connections that have

Starting a centrifugal pump against a "closed" valve helps reduce__________ and ___________.

If you find a coworker unconscious at the bottom of a confined space, you should

The most common use for a gate valve is

Plants give off vapor to the atmosphere in a process called

Thrust is a condition that occurs in

If a pump operates at a suction head of ________, mechanical seals are recommended

Fusible plug in a chlorine cylinder is designed to melt around ___________ to release pressure in a fire.

The most commonly used pump in the water distribution system is a

All vertical wall trenches 5' or deaper

Blow off valves are installed on

Velocity in a water main is usually measured

Distribution system pressure should not be allowed to drop below

The major cause of undue wear in a pump is

Liquefied chlorine will vaporize to gas and expand to aproximatly

Potable water lines should have at least _______ of horizontal separation from the sewer main

The C factor of a water pipe is

Hardness is water is caused by presences of

The standard current signal output used by most analog measuring devices in the water industry is

A common a very dangerous gas found in some confined spaces is

The type of pipe used for large water transmission mains is

In residential areas, isolation valves should be located at least every

"MCL" stands for

The maximum amount of water that can be withdrawn from a well continually over a period of time, which includes "the dries year", is referred to as the ___________ of a well.

The number of bacteriological samples that a water supplier must take monthly is based on