Liberty Distritubution Exam Prep 2

Front 1

Comprehensive maps of medium to large systems will usually have a scale ranging from _______ to _________ feet per 1 inch.

Back 1

500 to 1000

Front 2

An Ultrasonic meter operates on what principle?

Back 2

Doppler effect

Front 3

What is the determining factor when designing the size and capacity of distribution system tanks, pipes and pumps?

Back 3

Fire protection needs

Front 4

Most water systems use hydrants that have two nozzles with diameters of ______ inches and one nozzle with a diameter of _____ inches.

Back 4

2.5, 4.5

Front 5

What is the main purpose of distribution storage tanks?

Back 5

Meet peak water demands

Front 6

What other bacteriological sample may be substituted for the analysis of residual disinfectant concentration, when total coliforms are also sampled at the same sampling point?

Back 6

Heterotrophic plate count

Front 7

From the list below, select a type of joint for high-density polyethylene piping.

Back 7

thermal butt-fusion

Front 8

A concrete block that is placed around a pipe, usually at a bend or intersection to prevent movement, is called a:

Back 8

thrust block

Front 9

If you need to measure the flow of dirty or corrosive water, what type of meter would be the best choice?

Back 9

Magnetic

Front 10

Which gas has a rotten egg odor?

Back 10

Hydrogen sulfide

Front 11

The pressure in the system should always be above ______ psi during peak fire flow.

Back 11

20 psi

Front 12

Velocity meters are also known as:

Back 12

Current meters

Front 13

If the static water level in a well remains the same, and the drawdown is decreasing, what is the most likely cause?

Back 13

Well pump is losing its efficiency

Front 14

What is the purpose of sodium thiosulfate in coliform sample bottles?

Back 14

Remove chlorine residual

Front 15

Methemoglobinemia is caused by what water contaminant?

Back 15

Nitrate

Front 16

___________ maps should not overlap each other.

Back 16

Sectional

Front 17

The primary source of lead in drinking water is:

Back 17

Corrosion of plumbing systems

Front 18

A corporation stop is used for connecting a _________ line to the water main.

Back 18

Service

Front 19

Frequent starting of distribution system pumps is an indication of

Back 19

inadequate system storage

Front 20

What is the maximum practical lift range of most pumps?

Back 20

15-25 feet

Front 21

According to the SDWA, a public water system is one that has:

Back 21

15 service connections or serves 25 or more people for 60 or more days per year

Front 22

Residential distribution system pressure should be limited to prevent the premature failure of:

Back 22

Water heaters and other water appliances

Front 23

What needs to be determined first when designing a booster station?

Back 23

Head requirements

Front 24

Who is responsible for public notification if there is a water quality problem?

Back 24

The water system

Front 25

From the choices below, which violations are the most serious?

Back 25

Tier I

Front 26

If coliform bacteria is found in a water supply, what is the likely source?

Back 26

Fecal matter from warm blooded animals

Front 27

The energy loss called “minor head losses” are caused by

Back 27

sudden changes in direction or velocity of flow

Front 28

What component is at the top of a stuffing box?

Back 28

Packing gland

Front 29

Chlorine demand is the difference between the chlorine ________ and the chlorine _________ .

Back 29

Dose, residual

Front 30

The temperature of centrifugal pump motor bearings should be checked with a thermometer:

Back 30

Once a month

Front 31

Dead-ends in distribution systems are a common cause of what water quality complaint?

Back 31

Taste and odor

Front 32

What causes pressure head?

Back 32

Water elevation

Front 33

The Act passed by the U.S. Congress in 1974 to ensure safe drinking water for consumers is called the:

Back 33

Safe drinking water act

Front 34

What happens to the disinfection effectiveness of chlorine as water temperature decreases?

Back 34

Less effective

Front 35

A dry-barrel fire hydrant has:

Back 35

One main valve to isolate the barrel from water main pressure

Front 36

The total number of monthly distribution system total coliform (bacteriological) samples required is:

Back 36

based on population served

Front 37

Why is it necessary to maintain system pressure above 20 psi?

Back 37

Prevent contamination

Front 38

The best choice from this list of valves to regulate pressure and flow is: gate, globe, ball, check

Back 38

Globe

Front 39

Ductile iron piping using flexible ball joints is most appropriate for:

Back 39

River crossings or rugged terrain

Front 40

Water treatment plants using lime and soda ash precipitation softening methods try to end up with distribution system water that is:

Back 40

slightly scale forming

Front 41

A simple AC motor whose rotors are a series of bars placed in slots is called a __________ - __________ motor.

Back 41

Squirrel cage

Front 42

What type of valve is used to maintain the water level in a storage tank?

Back 42

Altitude valve

Front 43

A double acting altitude valve allows flow:

Back 43

In two different directions

Front 44

What happens to the accuracy of a positive displacement meter over time?

Back 44

It reads low

Front 45

What is the function of a foot valve?

Back 45

Maintain a prime on a pump

Front 46

From the list below, select a type of joint for ductile iron piping.

Back 46

Bell and spigot with rubber o-ring

Front 47

A __________ valve is commonly used on hydraulic lines connected to valve actuators.

Back 47

Needle

Front 48

Which test measures how clear water is?

Back 48

Turbidity

Front 49

When is the stored water age the highest in the distribution system?

Back 49

Early morning

Front 50

How are sample locations for coliform sampling selected.

Back 50

Locations that are representative of the entire system

Front 51

A connection between a potable water system and a non-potable water system is called a:

Back 51

Cross connection

Front 52

What is the maximum hold time for a coliform sample if you are sending it to an outside lab?

Back 52

30 hours

Front 53

What is the temperature in degrees Fahrenheit if the thermometer reads 16 degrees Celsius?

Back 53

61 degrees F

Front 54

The distance from a well that the cone of depression affects the normal water level is called:

Back 54

Zone of influence

Front 55

What type of meter is most commonly used for residential water metering?

Back 55

Positive displacement

Front 56

Chlorine gas is ___ times heavier than air.

Back 56

2.5

Front 57

PVC pipe should not be stacked more than _____ feet high when stacked loosely.

Back 57

3.0

Front 58

Why is it necessary to maintain a chlorine residual in the distribution system?

Back 58

Contamination can occur at any time

Front 59

After installing and pressure testing a new water main, what is the next thing that should be done?

Back 59

Disinfect it with a 25 mg/L to 50 mg/L chlorine solution for 24 hours

Front 60

What is the most common cause for pipe joint failure (leaking) in newly installed pipe?

Back 60

Not having the joint completely clean

Front 61

If a valve stem is packed with only two packing rings, how many degrees apart should the joints be staggered?

Back 61

90-180 degrees

Front 62

A water sample that is nearly identical to the content and consistency of a larger body of water is called a:

Back 62

Representative sample

Front 63

Polyvinyl chloride piping using solvent weld joints is only appropriate:

Back 63

For small lines

Front 64

A fire burning a wood framed building is considered a:

Back 64

Class A fire

Front 65

What device serves the same function as the packing but is used when pump suction pressure is ≥ 60 psi?

Back 65

mechanical seal

Front 66

The resistance of a material to longitudinal pulling forces before it breaks is called:

Back 66

Tensile strength

Front 67

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

Back 67

Ball-and-socket joint

Front 68

According to drinking water regulations, what does a water utility have to do if they fail to comply with monitoring requirements?

Back 68

Notify the public within one year of the violation

Front 69

How far can water be lifted by a siphon at sea level?

Back 69

33.9 feet

Front 70

What is the minimum required free chlorine residual in all parts of the distribution system is

Back 70

A detectable level

Front 71

When is the age of the water stored in the distribution system the lowest?

Back 71

Late evening

Front 72

If you suspect a chlorine cylinder valve is leaking, what is the best and most reliable method for determining if there is a leak?

Back 72

Use a chlorine gas detector and place it next to any area suspected of leaking

Front 73

How many times above the normal operating pressure should the pressure rating of distribution system piping be?

Back 73

2.5 to 4.0 times

Front 74

A fire hydrant that is hidden from public view is called a:

Back 74

Flush hydrant

Front 75

Which agency is responsible for establishing standards for drinking water?

Back 75

USEPA

Front 76

What is the average TTHM level if you have the following results: 0.0078 mg/L 0.0092 mg/L 0.0050 mg/L 0.0064 mg/L.

Back 76

0.0071 mg/L

Front 77

What type of valve will dampen the shock of water hammer?

Back 77

Pressure relief

Front 78

What color is used to mark reclaimed water piping?

Back 78

Purple

Front 79

From the choices below, choose a type of joint for ductile iron piping

Back 79

Flanged joint

Front 80

The difference between the static water level and pumping water level in a well is called:

Back 80

Drawdown

Front 81

The resistance of a material to the flow of electrical current is measured in _________.

Back 81

Ohms

Front 82

The first oil change on a newly installed pump should be performed:

Back 82

After one month of operation

Front 83

What are the units of head?

Back 83

Feet

Front 84

Which type of pipe joint joins pipe that has machined ends?

Back 84

Shouldered joint

Front 85

Flow velocity through pipe should be limited to 5 ft/sec in order to:

Back 85

minimize friction loss.

Front 86

Which gas has a rotten egg odor?

Back 86

Hydrogen sulfide

Front 87

The pressure in the system should always be above ______ psi during peak fire flow.

Back 87

20 psi

Front 88

Velocity meters are also known as:

Back 88

Current meters

Front 89

If the static water level in a well remains the same, and the drawdown is decreasing, what is the most likely cause?

Back 89

Well pump is losing its efficiency

Front 90

What is the purpose of sodium thiosulfate in coliform sample bottles?

Back 90

Remove chlorine residual

Front 91

Methemoglobinemia is caused by what water contaminant?

Back 91

Nitrate

Front 92

___________ maps should not overlap each other.

Back 92

Sectional

Front 93

The primary source of lead in drinking water is:

Back 93

Corrosion of plumbing systems

Front 94

A corporation stop is used for connecting a _________ line to the water main.

Back 94

Service

Front 95

Frequent starting of distribution system pumps is an indication of

Back 95

inadequate system storage

Front 96

What is the maximum practical lift range of most pumps?

Back 96

15-25 feet

Front 97

According to the SDWA, a public water system is one that has:

Back 97

15 service connections or serves 25 or more people for 60 or more days per year

Front 98

Residential distribution system pressure should be limited to prevent the premature failure of:

Back 98

Water heaters and other water appliances

Front 99

What needs to be determined first when designing a booster station?

Back 99

Head requirements

Front 100

Who is responsible for public notification if there is a water quality problem?

Back 100

The water system

Front 101

From the choices below, which violations are the most serious?

Back 101

Tier I

Front 102

If coliform bacteria is found in a water supply, what is the likely source?

Back 102

Fecal matter from warm blooded animals

Front 103

The energy loss called “minor head losses” are caused by

Back 103

sudden changes in direction or velocity of flow

Front 104

What component is at the top of a stuffing box?

Back 104

Packing gland

Front 105

Chlorine demand is the difference between the chlorine ________ and the chlorine _________ .

Back 105

Dose, residual

Front 106

The temperature of centrifugal pump motor bearings should be checked with a thermometer:

Back 106

Once a month

Front 107

Dead-ends in distribution systems are a common cause of what water quality complaint?

Back 107

Taste and odor

Front 108

What causes pressure head?

Back 108

Water elevation

Front 109

The Act passed by the U.S. Congress in 1974 to ensure safe drinking water for consumers is called the:

Back 109

Safe drinking water act

Front 110

What happens to the disinfection effectiveness of chlorine as water temperature decreases?

Back 110

Less effective

Front 111

A dry-barrel fire hydrant has:

Back 111

One main valve to isolate the barrel from water main pressure

Front 112

The total number of monthly distribution system total coliform (bacteriological) samples required is:

Back 112

based on population served

Front 113

Why is it necessary to maintain system pressure above 20 psi?

Back 113

Prevent contamination

Front 114

The best choice from this list of valves to regulate pressure and flow is: gate, globe, ball, check

Back 114

Globe

Front 115

Ductile iron piping using flexible ball joints is most appropriate for:

Back 115

River crossings or rugged terrain

Front 116

Water treatment plants using lime and soda ash precipitation softening methods try to end up with distribution system water that is:

Back 116

slightly scale forming

Front 117

A simple AC motor whose rotors are a series of bars placed in slots is called a __________ - __________ motor.

Back 117

Squirrel cage

Front 118

What type of valve is used to maintain the water level in a storage tank?

Back 118

Altitude valve

Front 119

A double acting altitude valve allows flow:

Back 119

In two different directions

Front 120

What happens to the accuracy of a positive displacement meter over time?

Back 120

It reads low

Front 121

What is the function of a foot valve?

Back 121

Maintain a prime on a pump

Front 122

From the list below, select a type of joint for ductile iron piping.

Back 122

Bell and spigot with rubber o-ring

Front 123

A __________ valve is commonly used on hydraulic lines connected to valve actuators.

Back 123

Needle

Front 124

Which test measures how clear water is?

Back 124

Turbidity

Front 125

When is the stored water age the highest in the distribution system?

Back 125

Early morning

Front 126

How are sample locations for coliform sampling selected.

Back 126

Locations that are representative of the entire system

Front 127

A connection between a potable water system and a non-potable water system is called a:

Back 127

Cross connection

Front 128

What is the maximum hold time for a coliform sample if you are sending it to an outside lab?

Back 128

30 hours

Front 129

What is the temperature in degrees Fahrenheit if the thermometer reads 16 degrees Celsius?

Back 129

61 degrees F

Front 130

The distance from a well that the cone of depression affects the normal water level is called:

Back 130

Zone of influence

Front 131

What type of meter is most commonly used for residential water metering?

Back 131

Positive displacement

Front 132

Chlorine gas is ___ times heavier than air.

Back 132

2.5

Front 133

PVC pipe should not be stacked more than _____ feet high when stacked loosely.

Back 133

3.0

Front 134

Why is it necessary to maintain a chlorine residual in the distribution system?

Back 134

Contamination can occur at any time

Front 135

After installing and pressure testing a new water main, what is the next thing that should be done?

Back 135

Disinfect it with a 25 mg/L to 50 mg/L chlorine solution for 24 hours

Front 136

What is the most common cause for pipe joint failure (leaking) in newly installed pipe?

Back 136

Not having the joint completely clean

Front 137

If a valve stem is packed with only two packing rings, how many degrees apart should the joints be staggered?

Back 137

90-180 degrees

Front 138

A water sample that is nearly identical to the content and consistency of a larger body of water is called a:

Back 138

Representative sample

Front 139

Polyvinyl chloride piping using solvent weld joints is only appropriate:

Back 139

For small lines

Front 140

A fire burning a wood framed building is considered a:

Back 140

Class A fire

Front 141

What device serves the same function as the packing but is used when pump suction pressure is ≥ 60 psi?

Back 141

mechanical seal

Front 142

The resistance of a material to longitudinal pulling forces before it breaks is called:

Back 142

Tensile strength

Front 143

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

Back 143

Ball-and-socket joint

Front 144

According to drinking water regulations, what does a water utility have to do if they fail to comply with monitoring requirements?

Back 144

Notify the public within one year of the violation

Front 145

How far can water be lifted by a siphon at sea level?

Back 145

33.9 feet

Front 146

What is the minimum required free chlorine residual in all parts of the distribution system is

Back 146

A detectable level

Front 147

When is the age of the water stored in the distribution system the lowest?

Back 147

Late evening

Front 148

If you suspect a chlorine cylinder valve is leaking, what is the best and most reliable method for determining if there is a leak?

Back 148

Use a chlorine gas detector and place it next to any area suspected of leaking

Front 149

How many times above the normal operating pressure should the pressure rating of distribution system piping be?

Back 149

2.5 to 4.0 times

Front 150

A fire hydrant that is hidden from public view is called a:

Back 150

Flush hydrant

Front 151

Which agency is responsible for establishing standards for drinking water?

Back 151

USEPA

Front 152

What is the average TTHM level if you have the following results: 0.0078 mg/L 0.0092 mg/L 0.0050 mg/L 0.0064 mg/L.

Back 152

0.0071 mg/L

Front 153

What type of valve will dampen the shock of water hammer?

Back 153

Pressure relief

Front 154

What color is used to mark reclaimed water piping?

Back 154

Purple

Front 155

From the choices below, choose a type of joint for ductile iron piping

Back 155

Flanged joint

Front 156

The difference between the static water level and pumping water level in a well is called:

Back 156

Drawdown

Front 157

The resistance of a material to the flow of electrical current is measured in _________.

Back 157

Ohms

Front 158

The first oil change on a newly installed pump should be performed:

Back 158

After one month of operation

Front 159

The volume of a sample for coliform compliance is:

Back 159

100 ml

Front 160

What type of valve is useful for throttling the flow of corrosive liquids?

Back 160

Pinch valve

Front 161

The study of fluids in motion is called

Back 161

Hydraulics

Front 162

The chlorine concentration in a distribution system, once the chlorine demand has been met, is called

Back 162

Chlorine residual

Front 163

What are the units of head?

Back 163

Feet

Front 164

From the list below choose which type of pipe has the lowest normal maximum working pressure.

Back 164

Polyvinyl chloride

Front 165

What type of pipe comes in a diameter as large as 14 ft (168 inches)?

Back 165

Reinforced concrete

Front 166

A sectional map has a scale ranging from _____ to _____ feet per 1 inch.

Back 166

50 to 100

Front 167

Why are booster pumps used in a distribution system?

Back 167

Raise pressure to overcome an elevation difference

Front 168

Who must sign the permit for a confined space entry?

Back 168

Entry supervisor

Front 169

A water tank has a sight glass on its side showing the water level in the tank. What is this surface level called?

Back 169

Piezometric surface

Front 170

A chemical feed pump used to dispense a chlorine solution into a water system is called a:

Back 170

hypochlorinator

Front 171

According to NFPA 291, what color should a fire hydrant that is connected to a municipal water system be painted if it is capable of delivering > 1,500 gpm at 20 psi?

Back 171

Blue

Front 172

Select the type of joint that can be used for connecting steel.

Back 172

Expansion joint

Front 173

Before entering an enclosed tank to work, what paperwork should be completed?

Back 173

Confined space permit

Front 174

Which type of pipe joint joins pipe that has machined ends?

Back 174

Shouldered joint

Front 175

What should the chlorine dose be when disinfecting a water main with the slug method?

Back 175

100 mg/l

Front 176

__________ __________ is the amount of energy in feet required to overcome resistance to flow in a pipe.

Back 176

Friction head

Front 177

What is the configuration of the distribution system that has dead-ends and smaller water mains?

Back 177

Tree system

Front 178

What is applied to the electrodes used for cathodic protection of a water storage tank?

Back 178

Dc current

Front 179

What type of pipe and fittings can be used with ductile iron pipe and fittings?

Back 179

PVC

Front 180

___________ _________ pipe has the highest normal maximum working pressure of the commonly used pipe material.

Back 180

Ductile iron

Front 181

Flow velocity through pipe should be limited to 5 ft/sec in order to:

Back 181

minimize friction loss.

Front 182

Which gas has a rotten egg odor?

Back 182

Hydrogen sulfide

Front 183

The pressure in the system should always be above ______ psi during peak fire flow.

Back 183

20 psi

Front 184

Velocity meters are also known as:

Back 184

Current meters

Front 185

If the static water level in a well remains the same, and the drawdown is decreasing, what is the most likely cause?

Back 185

Well pump is losing its efficiency

Front 186

What is the purpose of sodium thiosulfate in coliform sample bottles?

Back 186

Remove chlorine residual

Front 187

Methemoglobinemia is caused by what water contaminant?

Back 187

Nitrate

Front 188

___________ maps should not overlap each other.

Back 188

Sectional

Front 189

The primary source of lead in drinking water is:

Back 189

Corrosion of plumbing systems

Front 190

A corporation stop is used for connecting a _________ line to the water main.

Back 190

Service

Front 191

Frequent starting of distribution system pumps is an indication of

Back 191

inadequate system storage

Front 192

What is the maximum practical lift range of most pumps?

Back 192

15-25 feet

Front 193

According to the SDWA, a public water system is one that has:

Back 193

15 service connections or serves 25 or more people for 60 or more days per year

Front 194

Residential distribution system pressure should be limited to prevent the premature failure of:

Back 194

Water heaters and other water appliances

Front 195

What needs to be determined first when designing a booster station?

Back 195

Head requirements

Front 196

Who is responsible for public notification if there is a water quality problem?

Back 196

The water system

Front 197

From the choices below, which violations are the most serious?

Back 197

Tier I

Front 198

If coliform bacteria is found in a water supply, what is the likely source?

Back 198

Fecal matter from warm blooded animals

Front 199

The energy loss called “minor head losses” are caused by

Back 199

sudden changes in direction or velocity of flow

Front 200

What component is at the top of a stuffing box?

Back 200

Packing gland

Front 201

Chlorine demand is the difference between the chlorine ________ and the chlorine _________ .

Back 201

Dose, residual

Front 202

The temperature of centrifugal pump motor bearings should be checked with a thermometer:

Back 202

Once a month

Front 203

Dead-ends in distribution systems are a common cause of what water quality complaint?

Back 203

Taste and odor

Front 204

What causes pressure head?

Back 204

Water elevation

Front 205

The Act passed by the U.S. Congress in 1974 to ensure safe drinking water for consumers is called the:

Back 205

Safe drinking water act

Front 206

What happens to the disinfection effectiveness of chlorine as water temperature decreases?

Back 206

Less effective

Front 207

A dry-barrel fire hydrant has:

Back 207

One main valve to isolate the barrel from water main pressure

Front 208

The total number of monthly distribution system total coliform (bacteriological) samples required is:

Back 208

based on population served

Front 209

Why is it necessary to maintain system pressure above 20 psi?

Back 209

Prevent contamination

Front 210

The best choice from this list of valves to regulate pressure and flow is: gate, globe, ball, check

Back 210

Globe

Front 211

Ductile iron piping using flexible ball joints is most appropriate for:

Back 211

River crossings or rugged terrain

Front 212

Water treatment plants using lime and soda ash precipitation softening methods try to end up with distribution system water that is:

Back 212

slightly scale forming

Front 213

A simple AC motor whose rotors are a series of bars placed in slots is called a __________ - __________ motor.

Back 213

Squirrel cage

Front 214

What type of valve is used to maintain the water level in a storage tank?

Back 214

Altitude valve

Front 215

A double acting altitude valve allows flow:

Back 215

In two different directions

Front 216

What happens to the accuracy of a positive displacement meter over time?

Back 216

It reads low

Front 217

What is the function of a foot valve?

Back 217

Maintain a prime on a pump

Front 218

From the list below, select a type of joint for ductile iron piping.

Back 218

Bell and spigot with rubber o-ring

Front 219

A __________ valve is commonly used on hydraulic lines connected to valve actuators.

Back 219

Needle

Front 220

Which test measures how clear water is?

Back 220

Turbidity

Front 221

When is the stored water age the highest in the distribution system?

Back 221

Early morning

Front 222

How are sample locations for coliform sampling selected.

Back 222

Locations that are representative of the entire system

Front 223

A connection between a potable water system and a non-potable water system is called a:

Back 223

Cross connection

Front 224

What is the maximum hold time for a coliform sample if you are sending it to an outside lab?

Back 224

30 hours

Front 225

What is the temperature in degrees Fahrenheit if the thermometer reads 16 degrees Celsius?

Back 225

61 degrees F

Front 226

The distance from a well that the cone of depression affects the normal water level is called:

Back 226

Zone of influence

Front 227

What type of meter is most commonly used for residential water metering?

Back 227

Positive displacement

Front 228

Chlorine gas is ___ times heavier than air.

Back 228

2.5

Front 229

PVC pipe should not be stacked more than _____ feet high when stacked loosely.

Back 229

3.0

Front 230

Why is it necessary to maintain a chlorine residual in the distribution system?

Back 230

Contamination can occur at any time

Front 231

After installing and pressure testing a new water main, what is the next thing that should be done?

Back 231

Disinfect it with a 25 mg/L to 50 mg/L chlorine solution for 24 hours

Front 232

What is the most common cause for pipe joint failure (leaking) in newly installed pipe?

Back 232

Not having the joint completely clean

Front 233

If a valve stem is packed with only two packing rings, how many degrees apart should the joints be staggered?

Back 233

90-180 degrees

Front 234

A water sample that is nearly identical to the content and consistency of a larger body of water is called a:

Back 234

Representative sample

Front 235

Polyvinyl chloride piping using solvent weld joints is only appropriate:

Back 235

For small lines

Front 236

A fire burning a wood framed building is considered a:

Back 236

Class A fire

Front 237

What device serves the same function as the packing but is used when pump suction pressure is ≥ 60 psi?

Back 237

mechanical seal

Front 238

The resistance of a material to longitudinal pulling forces before it breaks is called:

Back 238

Tensile strength

Front 239

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

Back 239

Ball-and-socket joint

Front 240

According to drinking water regulations, what does a water utility have to do if they fail to comply with monitoring requirements?

Back 240

Notify the public within one year of the violation

Front 241

How far can water be lifted by a siphon at sea level?

Back 241

33.9 feet

Front 242

What is the minimum required free chlorine residual in all parts of the distribution system is

Back 242

A detectable level

Front 243

When is the age of the water stored in the distribution system the lowest?

Back 243

Late evening

Front 244

If you suspect a chlorine cylinder valve is leaking, what is the best and most reliable method for determining if there is a leak?

Back 244

Use a chlorine gas detector and place it next to any area suspected of leaking

Front 245

How many times above the normal operating pressure should the pressure rating of distribution system piping be?

Back 245

2.5 to 4.0 times

Front 246

A fire hydrant that is hidden from public view is called a:

Back 246

Flush hydrant

Front 247

Which agency is responsible for establishing standards for drinking water?

Back 247

USEPA

Front 248

What is the average TTHM level if you have the following results: 0.0078 mg/L 0.0092 mg/L 0.0050 mg/L 0.0064 mg/L.

Back 248

0.0071 mg/L

Front 249

What type of valve will dampen the shock of water hammer?

Back 249

Pressure relief

Front 250

What color is used to mark reclaimed water piping?

Back 250

Purple

Front 251

From the choices below, choose a type of joint for ductile iron piping

Back 251

Flanged joint

Front 252

The difference between the static water level and pumping water level in a well is called:

Back 252

Drawdown

Front 253

The resistance of a material to the flow of electrical current is measured in _________.

Back 253

Ohms

Front 254

The first oil change on a newly installed pump should be performed:

Back 254

After one month of operation

Front 255

The volume of a sample for coliform compliance is:

Back 255

100 ml

Front 256

What type of valve is useful for throttling the flow of corrosive liquids?

Back 256

Pinch valve

Front 257

The study of fluids in motion is called

Back 257

Hydraulics

Front 258

The chlorine concentration in a distribution system, once the chlorine demand has been met, is called

Back 258

Chlorine residual

Front 259

What are the units of head?

Back 259

Feet

Front 260

From the list below choose which type of pipe has the lowest normal maximum working pressure.

Back 260

Polyvinyl chloride

Front 261

What type of pipe comes in a diameter as large as 14 ft (168 inches)?

Back 261

Reinforced concrete

Front 262

A sectional map has a scale ranging from _____ to _____ feet per 1 inch.

Back 262

50 to 100

Front 263

Why are booster pumps used in a distribution system?

Back 263

Raise pressure to overcome an elevation difference

Front 264

Who must sign the permit for a confined space entry?

Back 264

Entry supervisor

Front 265

A water tank has a sight glass on its side showing the water level in the tank. What is this surface level called?

Back 265

Piezometric surface

Front 266

A chemical feed pump used to dispense a chlorine solution into a water system is called a:

Back 266

hypochlorinator

Front 267

According to NFPA 291, what color should a fire hydrant that is connected to a municipal water system be painted if it is capable of delivering > 1,500 gpm at 20 psi?

Back 267

Blue

Front 268

Select the type of joint that can be used for connecting steel.

Back 268

Expansion joint

Front 269

Before entering an enclosed tank to work, what paperwork should be completed?

Back 269

Confined space permit

Front 270

Which type of pipe joint joins pipe that has machined ends?

Back 270

Shouldered joint

Front 271

What should the chlorine dose be when disinfecting a water main with the slug method?

Back 271

100 mg/l

Front 272

__________ __________ is the amount of energy in feet required to overcome resistance to flow in a pipe.

Back 272

Friction head

Front 273

What is the configuration of the distribution system that has dead-ends and smaller water mains?

Back 273

Tree system

Front 274

What is applied to the electrodes used for cathodic protection of a water storage tank?

Back 274

Dc current

Front 275

What type of pipe and fittings can be used with ductile iron pipe and fittings?

Back 275

PVC

Front 276

___________ _________ pipe has the highest normal maximum working pressure of the commonly used pipe material.

Back 276

Ductile iron

Front 277

Flow velocity through pipe should be limited to 5 ft/sec in order to:

Back 277

minimize friction loss.