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Water > Water Distribution > Flashcards

Water Distribution Flashcards

1
Q

Head is measured in?

A

Feet

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2
Q

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

A

All of the above

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3
Q

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

A

5 degrees

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4
Q

Water high in nitrates can cause?

A

Methemoglobinemia also known as Blue Baby Disease

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5
Q

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?

A

2-4”

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6
Q

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

A

All of the above

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7
Q

Hydraulics is the study of?

A

Fluids in motion and at rest

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8
Q

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

A

Victaulic Joint

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9
Q

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

A

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

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10
Q

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

A

Permit Maximum Discharge

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11
Q

OSHA stands for?

A

Occupational Safety and Health Administration

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12
Q

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

A

Tuberculation

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13
Q

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

A

The throat of the venturi

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14
Q

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

A

Iron and Manganese

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15
Q

What is the MCL for THM’s?

A

80 mg/L

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16
Q

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

A

Restrain Joint

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17
Q

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

A

Flanged

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18
Q

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

A

Residual Drawdown

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19
Q

Venturi meters work on a?

A

Pressure Differential and have No Moving Parts

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20
Q

1 psi =

A

2.31’ of head

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21
Q

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

A

Wear Rings

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22
Q

Most regulated contaminants in drinking water?

A

Only cause health effects after long term exposure

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23
Q

What is the equation for Ohm’s law?

A

Volts=(amps)(ohms)

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24
Q

What effects does manganese in the water have?

A

Can discolor consumer’s laundry

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25
Q

Head loss in a water distribution system depends on

A

All of the above

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26
Q

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

A

Needle Valve

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27
Q

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

A

Steps or Ladder

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28
Q

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

A

Cone of depression

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29
Q

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

A

Comprehensive Map

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30
Q

Chlorine gas expands?

A

460 times to 1

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31
Q

The Safe Drinking Water Act sets?

A

Primary and Secondary Standards

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32
Q

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

A

Population or Number of Services

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33
Q

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

A

Ball and Socket Joints

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34
Q

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

A

Pressure Reducing Valve

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35
Q

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

A

Use portable blowers

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36
Q

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

A

False

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37
Q

Packing glands on a pump should always?

A

Be tightened to leak a few drops per minute

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38
Q

Why should a centrifugal pump never be run empty?

A

It would cause parts lubricated by water to be damaged

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39
Q

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

A

Animal Oil

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40
Q

Newly installed water mains should be flushed

A

Prior to and after disinfection

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41
Q

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

A

1-2’

42
Q

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

A

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

43
Q

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

A

6”

44
Q

Class B fire involves?

A

Flammable Liquids and Gas

45
Q

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

A

Come up to the centerline of the pipe

46
Q

Centrifugal force is generated?

A

In a direct ratio to the amount of water horsepower

47
Q

Almost all methods used to aerate a reservoir include?

A

Exposing a large surface area to the atmosphere

48
Q

A gallon jug filled with water weighs?

A

8.34lbs

49
Q

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

A

Possible Pollution in the Water Supply

50
Q

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

A

10 years

51
Q

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

A

8 hours

52
Q

Calcium hypochlorite comes in what form?

A

Tablets

53
Q

What is the odor detection limit for chlorine gas?

A

0.3ppm

54
Q

What is the sample size for lead and copper analysis?

A

1,000 mg/L

55
Q

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

A

White Cloud

56
Q

What is the minimum separation for an Air Gap?

A

1”

57
Q

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?

A

13

58
Q

What is this and what is it used for?

A

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

59
Q

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

A

19.5%

60
Q

The Total Coliform Rule is based on?

A

The presence or absence of coliforms in a water sample

61
Q

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

A

True

62
Q

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

A

At least 15 mins

63
Q

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

A

All of the Above

64
Q

A grout seal should be?

A

Filled with cement grout to a minimum of 10’ down

65
Q

Chlorine is chosen over chloramines because chlorine?

A

Is a much stronger oxidant

66
Q

What is a prescriptive water right?

A

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

67
Q

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

A

Pipeline Air Leaks

68
Q

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

A

Proportional

69
Q

What type of pipe joint consists of two machined surfaces?

A

Flanged Joints

70
Q

Sacrificial anodes are also known as?

A

Galvanic Anodes

71
Q

The middle layer is a reservoir is?

A

Metalimnion

72
Q

What is an example of Tier III violation.

A

Failing to take a routine water sample on time

73
Q

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

A

1-3%

74
Q

Sodium Hypochlorite comes in what form?

A

Liquid

75
Q

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

A

True

76
Q

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

A

Outside of the building

77
Q

Pipe strength is expressed in?

A

Tensile and Flexural

78
Q

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

A

True

79
Q

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

A

8”

80
Q

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

A

Strain Gauge

81
Q

Thrust blocks are installed to?

A

Prevent movement of pipes and joints

82
Q

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

A

DC Current

83
Q

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

A

True

84
Q

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

A

3hrs

85
Q

Anaerobic bacteria live?

A

In the absence of free oxygen

86
Q

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

A

Quarterly basis

87
Q

What type of joint is for steel piping?

A

Rubber Gasket Joint

88
Q

What present in water will increase corrosion rates?

A

Dissolved Oxygen

89
Q

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

A

Air

90
Q

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?

A

15 to 22 feet

91
Q

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

A

10ppm

92
Q

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

A

5 TON

93
Q

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

A

Eye Goggles

94
Q

Pollutants in water?

A

Are a low hazard and effect water aesthetics

95
Q

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

A

Alkalinity

96
Q

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?

A

24hrs

97
Q

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

A

4 degrees

98
Q

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

A

100ml

99
Q

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

A

Reinforced Concrete

100
Q

What is the most common problem with a hypochlorinator?

A

Clogged Equipment

Water (1 decks)

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