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T2 Practice Questions > T2 Prac 3 > Flashcards

T2 Prac 3 Flashcards

1
Q

What is the criteria for a community water system?

A

Has at least 15 service connections used by all-year residents or regularly serves at least 25 all-year residents

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2
Q

What is the acceptable limit of copper in drinking water?

A

1.3 mg/l

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3
Q

Which type of reservoir is rich in nutrients?

A

Eutrophic

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4
Q

What is a mechanical seal?

A

Metallic flat surfaces used to minimize leakage around the pump shaft

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5
Q

What is a confined aquifer?

A

An aquifer that is bounded above and below by confining beds

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6
Q

What best describes pumping water level in a well?

A

Upper surface of the groundwater that is being pumped

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7
Q

What is the name of the deepest layer of a reservoir under thermal stratification?

A

Hypolimnion

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8
Q

What is the health effect of consuming water with high levels of copper?

A

Stomach and intestinal distress such as nausea, vomiting, diarrhea and stomach cramps

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9
Q

What best describes a turbine pump?

A

A centrifugal pump that is mainly used to pump water from wells

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10
Q

What is typically used to clean the sludge on the bottom of a rectangular clarifier?

A

Chain and flight collectors

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11
Q

How often should preventative maintenance be performed on equipment?

A

Use manufacturer’s recommendation

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12
Q

What is CT?

A

Contact time X chlorine residual concentration

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13
Q

What is absorption?

A

Constituent is sucked in

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14
Q

What is the purpose of a check valve?

A

Allows water to flow in one direction and prevents reverse flow

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15
Q

What would happen to the pH of water if lime was added?

A

Increases pH

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16
Q

What is the term used to describe groundwater that flows naturally from the ground?

A

Spring

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17
Q

Once thermal stratification occurs in the middle and lower zones of a reservoir, what type of problem occurs in these layers?

A

Depletion of total dissolved oxygen

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18
Q

What is the most critical problem that may be encountered when entering a confined space?

A

Oxygen deficiency and toxic gas

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19
Q

What is a settleable solid?

A

Sand

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20
Q

What is not a commonly-used coagulant?

A

Sodium hypochlorite

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21
Q

What is the purpose of a coagulant aid?

A

Add density to slow settling flows and add toughness to the flocs

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22
Q

What is the purpose of a coagulant (not coagulant aid)?

A

Neutralize electrical charge

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23
Q

What is least likely to be removed in the sedimentation process?

A

Aqueous form of manganese

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24
Q

In the sedimentation process, what would happen if the flowrate were increased?

A

Lower efficiency

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25
Q

If turbidity is rising rapidly what should you do?

A

Verify the effectiveness of the coagulant chemicals and dosage at the flash mixer

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26
Q

The collection of a bad sample is as useful as what?

A

No result

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27
Q

What is not a mechanism that occurs in the filter media?

A

Precipitation

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28
Q

What is not a type of filter media used for gravity filtration?

A

Diatomaceous earth

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29
Q

What are the 3 types of media used in a multi-media filtration system?

A

Sand, anthracite coal, and garnet

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30
Q

What does “fluidized” mean in filtration?

A

Filter media is expanded during backwash

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31
Q

What is not an attribute of activated carbon?

A

Removes nitrate

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32
Q

How is filtration efficiency evaluated?

A

Turbidity measurement

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33
Q

What is not a way to address backwashing problems in a filter?

A

Adjust chemical injection rate

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34
Q

What is a requirement of the Surface Water Treatment Rule?

A

At least 99.9% removal of Giardia cysts

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35
Q

What is not a process that will remove pathogens from water?

A

Screening

36
Q

What will be formed when free chlorine combines with water?

A

Hypochlorous acid

37
Q

What is true about chlorine gas by itself?

A

Non-flammable and nonexplosive

38
Q

What is the most common source of waterborne disease outbreaks?

A

Backflow

39
Q

Why would a water utility switch from using sodium hypochlorite to chloramines?

A

Reduce formation of THMs

40
Q

What is a CT value?

A

A measure of the degree of pathogenic inactivation

41
Q

When is a hypochlorinator typically used?

A

To feed liquid chlorine

42
Q

Which contaminant should never be sampled using a composite sample?

A

Bacteria

43
Q

If liquid chlorine is leaking from a cylinder what should you do?

A

Turn container so that the leak is on top

44
Q

What provides the most convenient and repeatable chlorine residual results?

A

Amperometric titration

45
Q

What does not have a primary MCL?

A

Iron

46
Q

What is not true about chlorine gas?

A

Most people cannot detect chlorine gas at about 2 ppm

47
Q

What is the disadvantage of using ozone to disinfect water?

A

Cost

48
Q

What is the most common technique used to control taste and odor?

A

PAC

49
Q

What does an organic compound always contain?

A

Carbon

50
Q

What is a type of acid?

A

Hydrochloric

51
Q

What would violate the basic rules of laboratory work?

A

Pipet hazardous materials with your mouth

52
Q

What is true regarding water sampling?

A

Collecting samples at a water treatment plant is no different than collecting samples from a stream or river

53
Q

What has a rotten egg smell?

A

Hydrogen sulfide

54
Q

What total coliform bacteria test involves the use of lauryl tryptose broth?

A

Multiple tube fermentation method

55
Q

How is aklanity usually expressed?

A

Calcium carbonate equivalents

56
Q

What does a pH of 2 represent?

A

Strong acid

57
Q

What impact does Total Dissolved Solids (TDS) have on water quality?

A

Adverse taste

58
Q

What is the optimum pH of water for disinfecting bacteria?

A

7.5

59
Q

What is wire-to-water efficiency?

A

The combine efficiency of a pump and motor

60
Q

What is not a type of positive displacement pump?

A

Centrifugal

61
Q

What rotates at a high speed and imparts velocity to the water?

A

Impeller

62
Q

What is the term used to describe the shallow water of a reservoir with abundant plant growth?

A

Littoral zone

63
Q

What term is used to describe a connection between a drinking water system and an unapproved water supply?

A

Cross connection

64
Q

What impact do algal blooms have on the pH of a reservoir?

A

Increases pH

65
Q

What type of charge would you expect to see on a coagulant?

A

Positive

66
Q

What would cause excessive media to be in the spent backwash water?

A

Backwashing at high velocity

67
Q

What safety equipment must be worn before entering a confined space?

A

Harness

68
Q

What are typical characteristics of the source water for a direct filtration plant?

A

Low turbidity level, less than 2 NTU

69
Q

What is the purpose of the coagulation and flocculation process?

A

Neutralize the negative charges on the colloids, and slowly stir water to create flocs

70
Q

What would not trigger a filtration system to backwash?

A

Temperature

71
Q

What is the definition of disinfection?

A

Inactivation of most pathogens

72
Q

What is a secondary contaminant?

A

Manganese

73
Q

What is the safety hazard of working with polymers?

A

Slippery floors

74
Q

What is the disadvantage of using chloramines?

A

Weak disinfectant

75
Q

What is the purpose of a dial indicator?

A

Measure shaft misalignment

76
Q

What is an attribute of a diatomaceous earth filter?

A

Mesh screen is pre-coated with powdered media

77
Q

What is true about the presumptive test?

A

It takes 48 hrs to obtain results for the total coliform test

78
Q

What is a carcinogen?

A

Causes cancer

79
Q

What is the minimum required disinfection residual concentration leaving a surface water treatment plant?

A

.2 mg/l

80
Q

What is equal to 1 ppm?

A

1 mg/l

81
Q

What is the disadvantage of using UV to disinfect water?

A

No disinfectant residual

82
Q

What would most likely occur if a higher quantity of chlorine is added to water?

A

More THMs will form

83
Q

What is the most common error in water quality analysis?

A

Sampling

84
Q

What is the term used to describe the introduction into water of microorganisms, chemicals, and toxic substances in a concentration that makes the water unfit for its next intended use?

A

Contamination

85
Q

What acid is formed when chlorine is mixed with water?

A

Hypochlorous acid

T2 Practice Questions (4 decks)

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