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T2 Practice Questions > T2 Prac 1 > Flashcards

T2 Prac 1 Flashcards

(85 cards)

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1
Q

What is removed at the raw water intake?

A

Fish and debris

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2
Q

What is more likely to be found in groundwater?

A

Minerals

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3
Q

What is most commonly used to control algae growth in reservoirs?

A

Copper sulfate

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4
Q

What are common filtration rates in gravity filtration?

A

2 to 10 GPM/sq.ft.

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5
Q

Leakage within a centrifugal pump is intended for what purpose?

A

Cool moving parts

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6
Q

Definition of a grab sample

A

A single sample of water collected at a particular time and place which represents the composition of the water only at that time and place.

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7
Q

Adding sodium hypochlorite to water will have what effect?

A

Increase pH

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8
Q

What is the purpose of the Groundwater Rule?

A

To protect the groundwater from disease-causing microorganisms.

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9
Q

What is true about the Total Coliform Rule?

A

Establishes an MCL based on the presence and absence of total coliform or E. coli

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10
Q

What will happen to water quality if chlorine is injected at the same location as power activated carbon (PAC)?

A

Chlorine will react with carbon and neutralize the effects of both.

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11
Q

What will react with chlorine to form Trihalomethane?

A

Natural organic matter

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12
Q

What type of pump has a piston within the casing?

A

Reciprocating

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13
Q

What must be located near a hazardous chemical storage room?

A

SDS (safety data sheet)

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14
Q

What term describes the depression of a water table?

A

Cone of depression

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15
Q

What is the radius of influence?

A

The radial distance from the center of a well bore to the point where there is no lowering on the water table.

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16
Q

What is the best way to monitor filter performance?

A

Turbidity

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17
Q

What causes the water to look cloudy?

A

Suspended material

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18
Q

What chemical is sprayed near a chlorine gas leak to produce a white smoke?

A

Ammonia

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19
Q

Which water sampling parameters must be taken in the field?

A

pH and temperature

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20
Q

If the total coliform tests positive, then what must be done next?

A

Test for fecal coliform

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21
Q

What is performed to evaluate suspectibility to potential threats and identify corrective actions that can reduce or mitigate the risk for a water system?

A

Vulnerability assessment

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22
Q

What is the definition of holding time for water samples?

A

The length of time a water sample is retained between taking the sample and laboratory analysis

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23
Q

From a bacteriological standpoint, what is important for a well?

A

Protect it from contaminated runoff

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24
Q

Which is true of chlorine gas?

A

Its 2.5x heavier than air

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25
What happens after breakpoint chlorination is achieved?
Chlorine dose and residual increase at the same rate.
26
If chlorine residual is not detected after 3 mg/l of dosage is applied, then what might be occurring in the water?
Demand has not been met
27
Which of the following is an indicator organism for pathogens?
Coliform
28
What would happen if there is an increase in turbidity, organics, and manganese in the water?
Increase in chlorine demand
29
Which of the following would increase alkalinity in the water?
CaCO³ (calcium carbonate)
30
If you dropped the lid of a sample bottle prior to sampling, what should you do?
Use a new container
31
What is the purpose of the lantern ring in a centrifugal pump?
Provide lubrication and cooling
32
What is the definition of well draw down?
Distance between static and pumping water level
33
What should be done with a water sample that can not be analyzed in a timely manner?
Refrigerate it
34
What source water would most likely contain Cryptosporidium and Giardia?
Stream
35
What is the purpose of chlorine residual?
Provides a safeguard to kill additional microorganisms encountered after treatment
36
What is the equivalent to 3 log removal?
99.9%
37
How is turbidity measured?
Nephelometric
38
Which chemical is used to dechlorinate water?
Sodium thiosulfate
39
What must you wear prior to being exposed to chlorine gas?
Self-contained breathing apparatus (SCBA)
40
What is the minimum chlorine concentration required prior to introducing the effluent from a surface water filtration plant to the distribution system?
0.2 ppm
41
What best describes a water table?
Upper water surface of an aquifer
42
The Total Coliform Rule applies to what water system?
All public water systems
43
What is the purpose of a shaft sleeve in a pump?
Protects shaft from wear at stuffing box
44
Why isn't chlorine injected immediately prior to filtration?
Increases THMs
45
Which of the following is a disinfection by-product?
Trihalomethane
46
What is used to describe a well that is under pressure?
Artesian well
47
What would cause high concentration of nitrate in groundwater?
Over-fertilization of land
48
What is the purpose of Lead and Copper Rule?
Protect the public health by minimizing lead and copper in drinking water primarily by reducing water corrosivity
49
What is not affected by chlorine dose?
Hardness
50
How long should you run the water before you grab a water sample?
2 to 3 minutes
51
What is a typical form of calcium hypochlorite?
65% solid tablet
52
Frosting around the outlet connection of a chlorine gas cylinder indicates what?
Reduced flow of chlorine gas
53
What describes trickling of water from the ground surface towards the aquifer?
Percolation
54
What is a likely discharge of industrial waste found in surface water?
Organic solvents
55
Why shouldn't you have zero pressure in a water main?
Back siphonage may contaminate the water main
56
What should be inside a sample bottle when obtaining a sample for a coliform test?
Sodium thiosulfate
57
If the MCL for a constituent is violated, who is responsible for notifying the customers about this?
Water purveyor
58
What is the typical concentration of sodium hypochlorite?
12.5%
59
Is 2.5 mg/l of chlorine is dosed, and there is .5 mg/l of residual, what is the reason for the residual?
The residual is a safeguard for unanticipated chlorine demand in the distribution system
60
What must always be done before repairing a pump?
Lock out equipment
61
What is least likely to affect the effectiveness of chlorine?
Sodium
62
What is considered safe to drink?
No pathogens
63
Which reading must be taken in the field when obtaining a sample?
Chlorine residual
64
What device will give you the hydrogen ion concentration?
pH meter
65
What is a correct laboratory procedure?
Add acid to water
66
When dealing with a high pressure pipeline, what must you do?
Open and close valve slowly
67
What water source is more likely to have iron and manganese?
Groundwater
68
What will affect chlorine demand the most?
Turbidity and organics
69
What will make chlorine more effective in water?
Moderate increase in temperature
70
What are colloidal particles?
Very small particles that do not dissolve and remain dispersed in a liquid for a long time due to their small size and electrical charge
71
What is alkalinity?
The capacity of water to neutralize acid
72
What does MCL stand for?
Maximum Contaminant Level
73
What is in the zone of saturation?
Aquifer
74
What is a hydrologic cycle?
Continuous movement of water throughout the planet
75
What typically occurs at the beginning of a breakpoint chlorination curve?
Chlorine destroyed by reducing compounds
76
What is the drawback of pre-chlorination?
Formation of THMs
77
How long should the tap remain turned off before grabbing a sample for a lead and copper test?
6 hours
78
The secondary MCL is set for what purpose?
Aesthetic
79
What will lead to an illness?
Nitrate
80
What is the most likely cause of decreasing chlorine residual on the water main?
Bacteria and organics may be present
81
What is the aquifer typically composed of?
Sand and gravel
82
What is used to lower pH in water?
CO2, carbon dioxide
83
What is the maximum allowable chlorine residual concentration in the distribution main?
4 mg/l
84
Why is Trihalomethane considered to be harmful?
It is a carcinogen
85
What describes turbidity?
Cloudiness or haziness of a fluid caused by suspended solids

T2 Practice Questions (4 decks)

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