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T2 Practice Questions > T2 Prac 1 > Flashcards

T2 Prac 1 Flashcards

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
Q

What happens after breakpoint chlorination is achieved?

A

Chlorine dose and residual increase at the same rate.

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26
Q

If chlorine residual is not detected after 3 mg/l of dosage is applied, then what might be occurring in the water?

A

Demand has not been met

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27
Q

Which of the following is an indicator organism for pathogens?

A

Coliform

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28
Q

What would happen if there is an increase in turbidity, organics, and manganese in the water?

A

Increase in chlorine demand

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29
Q

Which of the following would increase alkalinity in the water?

A

CaCO³ (calcium carbonate)

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30
Q

If you dropped the lid of a sample bottle prior to sampling, what should you do?

A

Use a new container

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31
Q

What is the purpose of the lantern ring in a centrifugal pump?

A

Provide lubrication and cooling

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32
Q

What is the definition of well draw down?

A

Distance between static and pumping water level

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33
Q

What should be done with a water sample that can not be analyzed in a timely manner?

A

Refrigerate it

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34
Q

What source water would most likely contain Cryptosporidium and Giardia?

A

Stream

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35
Q

What is the purpose of chlorine residual?

A

Provides a safeguard to kill additional microorganisms encountered after treatment

36
Q

What is the equivalent to 3 log removal?

A

99.9%

37
Q

How is turbidity measured?

A

Nephelometric

38
Q

Which chemical is used to dechlorinate water?

A

Sodium thiosulfate

39
Q

What must you wear prior to being exposed to chlorine gas?

A

Self-contained breathing apparatus (SCBA)

40
Q

What is the minimum chlorine concentration required prior to introducing the effluent from a surface water filtration plant to the distribution system?

A

0.2 ppm

41
Q

What best describes a water table?

A

Upper water surface of an aquifer

42
Q

The Total Coliform Rule applies to what water system?

A

All public water systems

43
Q

What is the purpose of a shaft sleeve in a pump?

A

Protects shaft from wear at stuffing box

44
Q

Why isn’t chlorine injected immediately prior to filtration?

A

Increases THMs

45
Q

Which of the following is a disinfection by-product?

A

Trihalomethane

46
Q

What is used to describe a well that is under pressure?

A

Artesian well

47
Q

What would cause high concentration of nitrate in groundwater?

A

Over-fertilization of land

48
Q

What is the purpose of Lead and Copper Rule?

A

Protect the public health by minimizing lead and copper in drinking water primarily by reducing water corrosivity

49
Q

What is not affected by chlorine dose?

A

Hardness

50
Q

How long should you run the water before you grab a water sample?

A

2 to 3 minutes

51
Q

What is a typical form of calcium hypochlorite?

A

65% solid tablet

52
Q

Frosting around the outlet connection of a chlorine gas cylinder indicates what?

A

Reduced flow of chlorine gas

53
Q

What describes trickling of water from the ground surface towards the aquifer?

A

Percolation

54
Q

What is a likely discharge of industrial waste found in surface water?

A

Organic solvents

55
Q

Why shouldn’t you have zero pressure in a water main?

A

Back siphonage may contaminate the water main

56
Q

What should be inside a sample bottle when obtaining a sample for a coliform test?

A

Sodium thiosulfate

57
Q

If the MCL for a constituent is violated, who is responsible for notifying the customers about this?

A

Water purveyor

58
Q

What is the typical concentration of sodium hypochlorite?

A

12.5%

59
Q

Is 2.5 mg/l of chlorine is dosed, and there is .5 mg/l of residual, what is the reason for the residual?

A

The residual is a safeguard for unanticipated chlorine demand in the distribution system

60
Q

What must always be done before repairing a pump?

A

Lock out equipment

61
Q

What is least likely to affect the effectiveness of chlorine?

A

Sodium

62
Q

What is considered safe to drink?

A

No pathogens

63
Q

Which reading must be taken in the field when obtaining a sample?

A

Chlorine residual

64
Q

What device will give you the hydrogen ion concentration?

A

pH meter

65
Q

What is a correct laboratory procedure?

A

Add acid to water

66
Q

When dealing with a high pressure pipeline, what must you do?

A

Open and close valve slowly

67
Q

What water source is more likely to have iron and manganese?

A

Groundwater

68
Q

What will affect chlorine demand the most?

A

Turbidity and organics

69
Q

What will make chlorine more effective in water?

A

Moderate increase in temperature

70
Q

What are colloidal particles?

A

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
Q

What is alkalinity?

A

The capacity of water to neutralize acid

72
Q

What does MCL stand for?

A

Maximum Contaminant Level

73
Q

What is in the zone of saturation?

A

Aquifer

74
Q

What is a hydrologic cycle?

A

Continuous movement of water throughout the planet

75
Q

What typically occurs at the beginning of a breakpoint chlorination curve?

A

Chlorine destroyed by reducing compounds

76
Q

What is the drawback of pre-chlorination?

A

Formation of THMs

77
Q

How long should the tap remain turned off before grabbing a sample for a lead and copper test?

A

6 hours

78
Q

The secondary MCL is set for what purpose?

A

Aesthetic

79
Q

What will lead to an illness?

A

Nitrate

80
Q

What is the most likely cause of decreasing chlorine residual on the water main?

A

Bacteria and organics may be present

81
Q

What is the aquifer typically composed of?

A

Sand and gravel

82
Q

What is used to lower pH in water?

A

CO2, carbon dioxide

83
Q

What is the maximum allowable chlorine residual concentration in the distribution main?

A

4 mg/l

84
Q

Why is Trihalomethane considered to be harmful?

A

It is a carcinogen

85
Q

What describes turbidity?

A

Cloudiness or haziness of a fluid caused by suspended solids

T2 Practice Questions (4 decks)

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