Distribution operator

Question 1

Regardless of staging, the maximum theoretical suction lift of any pump is about:

Answer 1

34 ft.

Question 2

To properly flush a newly installed water main, the MINIMUM velocity should be:

Answer 2

2.5 ft. per sec.

Question 3

The two basic categories of pumps used in water supply are:

Answer 3

Velocity

Positive displacement

Question 4

Minimum pressure in a distribution system should not fall below:

Answer 4

20 psi

Question 5

The pH scale extends from:

Answer 5

0-14

Question 6

What is the weight of 1 cubic foot of water?

Answer 6

62. 4 Lbs.

8. 34 X 7.48

Question 7

Fire demand can account for as much as ____% of the total storage capacity.

Answer 7

50%

Question 8

Amount of storage and size of distribution mains is usually determined by:

Answer 8

Fire-flow demand

Question 9

Sheeting and shoring must be used in any excavation that is:

Answer 9

5 ft. or more in depth

Question 10

Class A fire extinguisher would be used on:

Answer 10

Paper, wood and clothing.

Question 11

In a dry barrel fire hydrant, the main valve is located:

Answer 11

In the foot

Question 12

Material excavated from a trench must be placed ___ft. from trench?

Answer 12

2 ft.

Question 13

Chlorine gas is:

Answer 13

Greenish-yellow in color.

Question 14

Flanged joint fittings are mainly used for:

Answer 14

Above ground fittings

Question 15

Most common type of meter used for private homes is:

Answer 15

Displacement

Question 16

What form of chlorine is most commonly used to disinfect a new water main?

Answer 16

Calcium hypochlorite

Question 17

Type of meter usually accurate over a wide range of flow is:

Answer 17

Compound

Question 18

Electrical current flow is measured in:

Answer 18

Amps

Question 19

The minimum distance a potable water line should be laid from a sewer line is:

Answer 19

10 ft.

Question 20

How often should an RPZ backflow preventer be tested?

Answer 20

Once a year

Question 21

C-factor refers to:

Answer 21

The smoothness of the interior of the pipe.

Question 22

Piezo metric elevation or pressure head is:

Answer 22

Vertical water column height

Question 23

What is the advantage in using centrifugal pumps?

Answer 23

Easy to repair

Question 24

When sampling for bacteria, sample bottle is prepared with which chemical in bottle?

Answer 24

Sodium Thiosulfate

Question 25

What is the main purpose of a water storage facility?

Answer 25

Provide sufficient amount of water to average or equalize the daily demands plus provide minimum pressures to fight fires

Question 26

Electrical demand in a wiring system is determined by the amount of:

Answer 26

Watts consumed

Question 27

Baffling in a storage facility is needed to prevent:

Answer 27

Straight through flows

Question 28

Chlorine may be added to water in continuous, slug and/or the _____ method.

Answer 28

Tablet

Question 29

Eighty parts per billion is equal to:

Answer 29

0.08mg / l

Question 30

What is the main difference between surface and groundwater contamination?

Answer 30

Groundwater takes longer to recover after contamination.

Question 31

What constitutes a cross-connection?

Answer 31

A connection between an approved and an unapproved water supply.

Question 32

What type of meter is used when the water flow widely fluctuates?

Answer 32

Compound meter

Question 33

Distribution systems are laid out in the following patterns.

Answer 33

Loops and/or circular designs

Question 34

Dead ends in a system are usually located on:

Answer 34

Tree shaped and grid designs

Question 35

Electrical system for prevention of rust and corrosion and pitting is called:

Answer 35

Cathodic protection

Question 36

Most common type of pipe joint is:

Answer 36

push-on joint

Question 37

Absolute minimum pressure a water system should maintain at all times is:

Answer 37

20 psi

Question 38

Systematic destruction of disease producing organisms is:

Answer 38

disinfection

Question 39

Group of bacteria found in intestines of warm blooded animals:

Answer 39

Coliform

Question 40

The principal purpose of an altitude valve on an elevated tank is to:

Answer 40

Control maximum filling level in distribution storage.

Question 41

Cathodic protection systems for tanks use sacrificial anodes and:

Answer 41

A direct current power supply.

Question 42

The rotating element in centrifugal pumps is commonly called an

Answer 42

Impeller

Question 43

The pressure exerted by a column of water when at rest is the ___________ pressure.

Answer 43

Static

Question 44

What is the primary purpose of well grouting?

Answer 44

Prevent surface water contamination from entering the aquifer.

Question 45

The type of corrosion caused by the use of dissimilar metals in water systems is known as ______corrosion.

Answer 45

Galvanic

Question 46

The term for the pressure against which a pump must operate is:

Answer 46

Head

Question 47

What do most pumps require before they can pump fluids?

Answer 47

The casing is full of water (Primed).

Question 48

A pipe's carrying capacity depends on its size, water pressure, flow velocity and what other factor?

Answer 48

Head loss

Question 49

What is pressure head caused by?

Answer 49

Water elevation.

Question 50

What is the maximum recommended distance between valves on mains 12 inch and smaller?

Answer 50

1000 feet

Question 51

Where should distribution storage tanks be located in the system?

Answer 51

In the center of the system.

Question 52

Fire demand can account for what percent of flow in the design of a water system.

Answer 52

50%

Question 53

``` Complaints of poor water quality most likely occur in: A. Arterial loop B. Grid C. Tree D. Nebular ```

Answer 53

C. Tree

Question 54

``` Asbestos-cement pipe contains which of the following materials? A. Fiberglass B. Silica sand C. Polyethylene D. Crushed granite ```

Answer 54

B. Silica Sand

Question 55

``` What type of joint should not be used in underground applications? A. Mechanical B. Flange C. Ball D. Flare ```

Answer 55

B. Flange