1
Q
When is an appropriate time to use a by-pass valve?
A
With a gate valve
2
Q
Fire demand can account for what percentage of total capacity of a storage system?
A
50%
3
Q
The profundal zone of a lake is?
A
a deep zone of an inland body of freestanding water, located below the range of effective light penetration.
4
Q
When a control switch that is operated by changes in pressure located too close to a pump station what problem may occur?
A
Racking-erratic pump operator
5
Q
What type of joint for connecting water pipes has the disadvantage of having a groove that weakens the pipe wall?
A
Victaulic joint
6
Q
Shielding or trench box must?
A
Extend 18” above the top of excavation and 2’ maximum gap from the bottom.
7
Q
how often should you change the fusible plug on a 150lb chlorine cylinder?
A
Never
8
Q
What type of pipe joint consists of two machined surfaces?
A
Flanged joints
9
Q
A grout seal should be?
A
Filled with cement grout to a minimum of 10’ down
10
Q
1 psi=
A
2.31’ of head
11
Q
red hydrant cap means?
A
Less than 500gpm
12
Q
Type of polar bonds are between the hydrogen atoms and the oxygen atom in the water?
A
Covalent bonds
13
Q
What type of pressure sensor uses a wire attached to a diaphram?
A
Strain gauge
14
Q
Spontaneous combustion can occur when chlorine is mixed with?
A
Activated carbon
15
Q
What can be used to control scaling, but never be used to control corrosion?
A
Sequestering
16
Q
What is the purpose of sodium thiosulfate in a water sample bottle?
A
To neutralize any chlorine present in the water sample
17
Q
What type of pipe joint is available in both bolted and boltless flexible pipe joint designs?
A
Ball and socket
18
Q
Almost all methods used to aerate a reservoir include?
A
Exposing a large surface area to the atomsphere
19
Q
If a pump does not hold its prime, what could be wrong?
A
Foot valve is worn out
20
Q
Hydraulics is the study of?
A
Fluids in motion and at rest
21
Q
Soil that is cohesive contains a lot of ?
A
Clay
22
Q
If air is used to generate ozone, which percentage of the air is usually converted to ozone?
A
1-3%
23
Q
The proper emergency kit for a chlorine tanker is?
A
Kit C
24
Q
If a lane on a road needs to be closed due to an excavation and the speed limit is 25mph, how many cones are required to divert traffic?
A
6
25
Where do good public relations start for any water district?
Through all the water districts employees
26
If a water system fails to collect their water distribution system samples, under which public notification tier would the water system fall under?
Tier III
27
On a brand new pump, when should the first oil change be done?
After one month of operation
28
What device changes the alternating current to direct current by allowing the electric current to flow in one direction but blocks flow in the opposite direction?
Rectifier
29
What type of joint has moderate deflection and gaskets absorb vibration and pipe movement?
Dressler coupling
30
Centrifugal force is generated?
In a direct ratio to the amount of water horsepower
31
What is the odor detection limit for chlorine gas?
0.3 ppm
32
When using chlorine tablets to disinfect a pipeline during installation, the tablets should be placed where?
On the inside top of the pipe
33
What term describes a measure of the capacity of water to neutralize a strong acid?
Alkalinity
34
Aeration of certain organic compounds and free chlorine can form?
Trihalomethanes (THM's)
35
How is capacity of a centrifugal pump related to the total head?
Directly
36
According to the SWTR, water systems serving a population of more than 500 persons must sample the filtered water for turbidity every?
every four hours
37
The proper emergency kit for a TON chlorine cylinder is?
Kit B
38
Water mains that are 12" or less in diameter should have isolation valves that are located not more than how many feet between each other?
1,000'
39
The sample size for lead and copper analysis?
1,000 mg/l
40
The disinfection power of chlorine goes down as the pH decreases.
False
41
What is the MCL for coliform Bacteria
Based on the population
42
When responding to a chlorine gas leak, the responder should have a SCBA and a?
Level A suit
43
Chlorine is chosen over chloramines because chlorine?
Is a much stronger oxidant
44
What is an example of a Tier III violation
Failing to take a routine water sample on time
45
Equipment that needs to be lubed in a water system setting should be lubed?
To manufacturer's specifications
46
What us the measure of a materials opposition to the flow of electrical current?
Ohm's
47
The SWTR requires that disinfectant residuals be collected at the same location in the distribution system as?
Samples tested for Coliforms
48
What valve can go from fully open to fully closed with 1/4 turn?
Plug valve
49
What will a flexible diaphragm coupling compensate for in angular movement?
4 degrees
50
What type of joint is for steel piping?
Expansion joint
51
Velocity of flow in water mains is usually expressed in?
FPS
52
What provides a profile of hazardous mixtures and substances?
SDS- safety data sheets
53
Free chlorine residual values are based on contact time of at least?
1 min
54
Haloacetic acids (HAA5) are formed through?
Disinfection process of drinking water
55
Pollutants in water?
Are a low hazard and effect water aesthetics
56
a one ton cylinder filled with chlorine weighs approximately?
3700lbs
57
Ideally, water mains should be flushed at what rate?
5 fps
58
What can be done to prevent cavitation from occurring?
Reduce the suction lift
59
The limnetic zone of a lake is?
Well lit open surface waters in a lake away from shore
60
An autoclave will sterilize at
with steam at 121 degrees Celsius at 15 psi
61
*What agency mandates the language and methods for Public notification.*
*USEPA
62
A public water system that uses surface water or ground water under the influence of surface water and provides filtration treatment is required to report an active violation of the filtered water turbidity standard if any turbidity measurements collected during the month exceeded?
5.0 NTU
63
In an excavation a ladder must be placed within how many feet of every person in the trench?
25'
64
Calcium hypchlorite comes in the form?
Tablets
65
If ammonia vapor is passed over a chlorine leak from a cylinder valve, the leak is indicate by
White cloud
66
Taste and odor complaints in the water system can be caused by?
Dead end water mains
67
How much deflection is allowed for AC couplings that are 3" to 12" in diameter?
5 degrees
68
What should be installed at dead end water main?
Blow-off valve
69
What type of pipe joint is used in an area with hills or earthquakes to make sure joints do not separate?
Restrain joint
70
What tier violation has the most critical impact on human health and notification is immediate?
Tier I
71
What chemical decreases corrosion rates?
Calcium Carbonate CaCo3
72
When should packing replacement occur?
When no further tightening can be done to the packing gland
73
What reduces pressure down stream?
Pressure reducing regulator
74
MCLG for lead in the drinking water?
0 Mg/L
75
how are chloramines formed?
When chlorine is combined with aqua ammonia
76
Meters that work over a wide range of flows are known as?
Compound
77
Although velocity head can usually be ignored, it be considered when it is what percent of pressure head?
1-2%
78
What type of oil should not be used to lubricate bearings because it forms acids as it begins to break down?
Animal oil
79
A water sample should be analyzed for a chlorine residual immediately, but if not the operator can analyze the sample for chlorine residual within?
15 mins
80
What thrust control is easy to use, especially in locations where existing utilities or structures are numerous?
Restraining fittings
81
Minimum desired water pressure is?
35 psi
82
The fluoride concentration in drinking water is set in relation to?
Annual average maximum daily air temperature
83
When sampling for THM's what percentage of samples must be taken at the furthest point in the distribution system?
25%
84
Opening the discharge valve one full turn on a chlorine cylinder will?
Permit maximum discharge
85
pH is a measure of
Hydrogen ion activity
86
What is the term that defines the inactivation of pathogenic organisms in water?
Disinfection
87
The breaking of a buried pipe when it is unevenly supported is called?
Beam breakage
88
The more hydrogen ions
the more acidic the solution
89
The EPA recommends water systems using surface water to collect samples for hexavalent chromium (chromium-6) on what basis?
Quarterly basis
90
Type of valve is used on hydraulic lines connected to valve actuators?
Needle valve
91
Important factor prevents contamination of a ground water well?
Sanitary seal
92
How much chlorine should be used when swabbing new water lines ?
2 ounces dry calcium hypochlorite per 1 gallon of water
93
A water source that flows continuously at all times of the year is called?
Perennial stream
94
The amount of power in watts required during a certain time period is?
Electrical demand
95
What chlorine concentration should be used to spray or paint disinfect the inside of a water storage tank?
200mg/L
96
What does DBP stand for?
Disinfection before production
97
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?
2-4"
98
Minimum velocity water main should be flushed?
2.5 fps
99
How much deeper below the grade line of a pipe bottom should a trench be excavated if it is being dug in a rock formation?
6-9in
100
Gauge used to perform hydrant flow testing?
pitot gauge
101
Type of Meyer based on the Doppler effect?
Ultrasonic Meter
102
How often should bearings be regreased?
3-6 months
103
venturi meters are used for?
Large flows
104
What is the pneumatic standard range?
3-15 PSIG
105
How much larger should the outside diameter be of casing pipe protecting large water mains?
2-8" larger than the water main bells
106
The minimum cover over a water service in a warm climate is?
18"
107
What is the minimum contact time when disinfecting water mains using the chlorine slug method?
3hrs
108
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
false
109
Mechanical seals are most appropriate for pumps operating under what condition?
High Suction Head
110
An approved backflow assembly that can be used to prevent backflow and backsiphonage is
Reduced Pressure Principle - RP
111
DPD indicator turns water what color.
Pink/Red
112
All consumer water meters must test within what range of accuracy?
Within 1.5% Over or Under
113
To ease installation of impeller wear rings, they can be?
Heated
114
What present in water will increase corrosion rates?
Dissolved Oxygen
115
115
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen. T or F
True
115
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