Water Distribution

Question 1

Head is measured in?

Answer 1

Feet

Question 2

Critical safeguard(s) for a water distribution system are?

Answer 2

All of the above

Question 3

How much deflection is allowed for AC couplings that are 3” to 12” in diameter?

Answer 3

5 degrees

Question 4

Water high in nitrates can cause?

Answer 4

Methemoglobinemia also known as Blue Baby Disease

Question 5

If a water main can not be installed at an adequate depth to prevent freezing, Styrofoam
insolation board can be used to protect the water in the pipe from freezing. How far above the pipe
does the Styrofoam insulation need to be installed?

Answer 5

2-4”

Question 6

Identify which is a Cross-Connection hazard in a drinking water system.

Answer 6

All of the above

Question 7

Hydraulics is the study of?

Answer 7

Fluids in motion and at rest

Question 8

What type of joint for connecting water pipes has the disadvantage of having a groove that
weakens the pipe wall?

Answer 8

Victaulic Joint

Question 9

In order for a sample to be considered a, “First Draw Sample” for Lead & Copper testing, the
water must?

Answer 9

Have been motionless in the service line for at least 6 hours

Question 10

Opening the discharge valve one full turn on a chlorine cylinder will?

Answer 10

Permit Maximum Discharge

Question 11

OSHA stands for?

Answer 11

Occupational Safety and Health Administration

Question 12

The C factor, or carrying capacity of a pipe, is often reduced by?

Answer 12

Tuberculation

Question 13

On a venturi meter the up or down stream pressure is compared to the pressure?

Answer 13

The throat of the venturi

Question 14

Black and Red stains on a consumer’s plumbing could indicate that the source water has high
levels of?

Answer 14

Iron and Manganese

Question 15

What is the MCL for THM’s?

Answer 15

80 mg/L

Question 16

What type of pipe joint is used in an area with hills or earthquakes to make sure joints do not
sperate?

Answer 16

Restrain Joint

Question 17

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

Answer 17

Flanged

Question 18

The water level below the normal level that persists after a well pump has been off for a period
of time is?

Answer 18

Residual Drawdown

Question 19

Venturi meters work on a?

Answer 19

Pressure Differential and have No Moving Parts

Question 20

1 psi =

Answer 20

2.31’ of head

Question 21

What parts on a centrifugal pump restricts flow between the impeller discharge and suction
areas?

Answer 21

Wear Rings

Question 22

Most regulated contaminants in drinking water?

Answer 22

Only cause health effects after long term exposure

Question 23

What is the equation for Ohm’s law?

Answer 23

Volts=(amps)(ohms)

Question 24

What effects does manganese in the water have?

Answer 24

Can discolor consumer’s laundry

Question 25

Head loss in a water distribution system depends on

Answer 25

All of the above

Question 26

What type of valve is used on hydraulic lines connected to valve actuators?

Answer 26

Needle Valve

Question 27

When employees are working in a trench that is 5' deep or more, that must have an adequate means of exit within 25' like?

Answer 27

Steps or Ladder

Question 28

The depression around the wall of the water surface caused by pumping water from the well is?

Answer 28

Cone of depression

Question 29

What type of map provides a clear picture of the entire water distribution system?

Answer 29

Comprehensive Map

Question 30

Chlorine gas expands?

Answer 30

460 times to 1

Question 31

The Safe Drinking Water Act sets?

Answer 31

Primary and Secondary Standards

Question 32

What determines the minimum number of bacteriological samples that must be collected in a water distribution system?

Answer 32

Population or Number of Services

Question 33

What type of joint is available in both bolted and boltless flexible pipe joint desings?

Answer 33

Ball and Socket Joints

Question 34

What valve should be used when it is needed to supply water to different pressure zones?

Answer 34

Pressure Reducing Valve

Question 35

The most effective means of reducing atmospheric hazards in a confined space is?

Answer 35

Use portable blowers

Question 36

Water mains should only be flushed when there is an apparent water quality issue.

Answer 36

False

Question 37

Packing glands on a pump should always?

Answer 37

Be tightened to leak a few drops per minute

Question 38

Why should a centrifugal pump never be run empty?

Answer 38

It would cause parts lubricated by water to be damaged

Question 39

What type of oil should not be used to lubricate bearings because it forms acids as it begins to break down?

Answer 39

Animal Oil

Question 40

Newly installed water mains should be flushed

Answer 40

Prior to and after disinfection

Question 41

A trench should generally be no more than how many feet wider than the diameter of the water main?

Answer 41

1-2'

Question 42

One of the best ways to prevent freezing in a storage tank is to?

Answer 42

Lower the Tank Full Step points and Raise and Lower the Level of the Tank Frequently

Question 43

Fire insurance underwriters recommend that no water main should have a diameter less than?

Answer 43

6"

Question 44

Class B fire involves?

Answer 44

Flammable Liquids and Gas

Question 45

The first layer of backfill compaction that is required for a newly installed pipe should?

Answer 45

Come up to the centerline of the pipe

Question 46

Centrifugal force is generated?

Answer 46

In a direct ratio to the amount of water horsepower

Question 47

Almost all methods used to aerate a reservoir include?

Answer 47

Exposing a large surface area to the atmosphere

Question 48

A gallon jug filled with water weighs?

Answer 48

8.34lbs

Question 49

The chlorine demand to maintain a residual jumps from 0.9mg/L to 3.0mg/L. What does this indicate?

Answer 49

Possible Pollution in the Water Supply

Question 50

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

Answer 50

10 years

Question 51

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

Answer 51

8 hours

Question 52

Calcium hypochlorite comes in what form?

Answer 52

Tablets

Question 53

What is the odor detection limit for chlorine gas?

Answer 53

0.3ppm

Question 54

What is the sample size for lead and copper analysis?

Answer 54

1,000 mg/L

Question 55

If ammonia vapor is passed over a chlorine leak from a cylinder valve, the leak is indicate by

Answer 55

White Cloud

Question 56

What is the minimum separation for an Air Gap?

Answer 56

1"

Question 57

If a lane on a road needs to be closed due to an excavation and the speed limit is 45mph, how many cones are required to divert traffic?

Answer 57

13

Question 58

What is this and what is it used for?

Answer 58

Corporation Stop used to shut off the water at the water main feeding the service line

Question 59

When working in a confined space the oxygen level should never drop below?

Answer 59

19.5%

Question 60

The Total Coliform Rule is based on?

Answer 60

The presence or absence of coliforms in a water sample

Question 61

The backfill material for a pipe installation should contain enough moisture for a thorough compaction?

Answer 61

True

Question 62

If an operator gets sodium hypochlorite on their skin or in their eyes, immediately flush with water for how long?

Answer 62

At least 15 mins

Question 63

When entering a permitted confined space entry structure, always complete a permit and?

Answer 63

All of the Above

Question 64

A grout seal should be?

Answer 64

Filled with cement grout to a minimum of 10' down

Question 65

Chlorine is chosen over chloramines because chlorine?

Answer 65

Is a much stronger oxidant

Question 66

What is a prescriptive water right?

Answer 66

A right that is acquired through adverse possession of someone else’s water right. It is similar to a “squatter’s right” to land.

Question 67

Milky water that clears in time from the bottom up is a possible indication of?

Answer 67

Pipeline Air Leaks

Question 68

What type of water meter determines the total flow by multiplying the flow through meter by a factor?

Answer 68

Proportional

Question 69

What type of pipe joint consists of two machined surfaces?

Answer 69

Flanged Joints

Question 70

Sacrificial anodes are also known as?

Answer 70

Galvanic Anodes

Question 71

The middle layer is a reservoir is?

Answer 71

Metalimnion

Question 72

What is an example of Tier III violation.

Answer 72

Failing to take a routine water sample on time

Question 73

If air is used to generate ozone, which percentage of the air is usually converted to ozone?

Answer 73

1-3%

Question 74

Sodium Hypochlorite comes in what form?

Answer 74

Liquid

Question 75

Lead contamination in drinking water may cause children to have altered physical and mental developments.

Answer 75

True

Question 76

The chlorine room should be constructed so it can only be entered from?

Answer 76

Outside of the building

Question 77

Pipe strength is expressed in?

Answer 77

Tensile and Flexural

Question 78

Permit required confined space entry requires a chest or full body harness and a retrieval line.

Answer 78

True

Question 79

The ISO recommends that non-looped water mains connected to fire hydrants have a diameter of at least?

Answer 79

8"

Question 80

What type of pressure sensor uses a wire attached to a diaphram?

Answer 80

Strain Gauge

Question 81

Thrust blocks are installed to?

Answer 81

Prevent movement of pipes and joints

Question 82

What is applied to electrodes placed in the water of a water storage tank?

Answer 82

DC Current

Question 83

Valve opening and closing is the main cause of hydraulic transient in a water distribution system.

Answer 83

True

Question 84

What is the minimum contact time when disinfecting water mains using the chlorine slug method?

Answer 84

3hrs

Question 85

Anaerobic bacteria live?

Answer 85

In the absence of free oxygen

Question 86

The EPA recommends water systems using surface water to collect samples for hexavalent chromium (chromium-6) on what basis?

Answer 86

Quarterly basis

Question 87

What type of joint is for steel piping?

Answer 87

Rubber Gasket Joint

Question 88

What present in water will increase corrosion rates?

Answer 88

Dissolved Oxygen

Question 89

The sensors that respond to liquid pressure will perform poorly if what enters the sensor?

Answer 89

Air

Question 90

You have a new gasoline powered diaphragm pump and are using heavy-duty spiral wire reinforced suction hose. What is the practical maximum height at which to set the pump above the water level?

Answer 90

15 to 22 feet

Question 91

The IDLH (immediately dangerous to life and health) value for chlorine is?

Answer 91

10ppm

Question 92

What level of threshold odor number (TON) will result in a customer complaint?

Answer 92

5 TON

Question 93

What type of personal protective equipment should an operator wear when handling hypochlorite?

Answer 93

Eye Goggles

Question 94

Pollutants in water?

Answer 94

Are a low hazard and effect water aesthetics

Question 95

What term describes a measure of the capacity of water to neutralize a strong acid?

Answer 95

Alkalinity

Question 96

What is the detention time for disinfecting a water storage tank with water mixed with hypochlorites and has a free chlorine of 10 mg/L?

Answer 96

24hrs

Question 97

What will a flexible diaphragm coupling compensate for in angular movement?

Answer 97

4 degrees

Question 98

What is the volume of a bac-T sample (coliform sample)

Answer 98

100ml

Question 99

What type of pipe requires special external protection in high-chloride soil?

Answer 99

Reinforced Concrete

Question 100

What is the most common problem with a hypochlorinator?

Answer 100

Clogged Equipment