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D2 Practice Questions > D2 Practice 3 > Flashcards

D2 Practice 3 Flashcards

1
Q

Which device measures the hydrogen ion activity in a solution?

A

pH meter

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2
Q

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

A

Protects the sleeve from damage

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3
Q

What is a nutating-disc?

A

Type of water meter for small-diameter domestic service

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4
Q

What will happen to a steel pipe if the water has low pH?

A

Corrode

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5
Q

_______ is a disinfection by-product precursor.

A

Natural organic matter

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6
Q

One of the requirements of the Lead and Copper Rule is for water systems to ______ if the action levels for lead or copper are exceeded (based on 90th percentile of tap water samples).

A

Install corrosion control

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7
Q

If chlorine was added to water, but there is no chlorine residual, what is true?

A

Chlorine demand has not been met

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8
Q

Which following is a parasite and microbiological contaminant?
Iron, Nitrate, Giardia, Arsenic

A

Giardia

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9
Q

What is a typical characteristic of surface water?

A

Surface Water contains more microorganisms and less minerals than groundwater.

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10
Q

If groundwater is under the direct influence of surface water, how could the surface water affect the quality of groundwater?

A

Increases microorganisms and turbidity

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11
Q

What is an advantage of using a flex-coupling on a pump?

A

Allows for a slight shaft misalignment between the pump and motor

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12
Q

What could happen if a valve is closed too quickly?

A

Water hammer

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13
Q

Which terminology refers to a well under pressure?

A

Artesian well

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14
Q

What is the typical strength of bulk sodium hypochlorite solution for disinfecting a water supple?

A

12.5%

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15
Q

What is required if you drop a sample container and the lid?

A

Get a new container and lid

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16
Q

Why is trihalomethane considered a threat to human health?

A

Carcinogen

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17
Q

What safety equipment should be used when handling calcium hypochlorite?

A

Wear rubber gloves, rubber apron, rubber boots, and a face shield

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18
Q

Which document contains information about chemicals, including instructions for safe use and a description of the hazards associated with the chemical?

A

MSDS or SDS

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19
Q

What following is a disinfection by-product?
Sodium hypochlorite, Calcium hypochlorite, THM, Sodium thiosulfate

A

THM

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20
Q

What is coliform bacteria?

A

Indicator organism

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21
Q

How could you minimize the formation of disinfection by-products?

A

Change the type of disinfectant used

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22
Q

What is the best way to prevent back flow?

A

Air gap

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23
Q

What is recommended if you encounter a centrifugal pump with a slight leak at the packings?

A

Do nothing. The slight leak is required to cool and lubricate the packings.

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24
Q

What is the common valve in the water distribution system?

A

Gate valve

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25
Q

Which disinfectant is less effective than free chlorine residuals but will last a long time in the distribution system?

A

Chloramine

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26
Q

Which two factors are essential to effectively kill pathogens?

A

Adequate chlorine residual and contact time

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27
Q

What impact will injecting sodium hypochlorite have on the pH of water?

A

Increases pH

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28
Q

What is always required before performing any maintenance work on a mechanical or electrical equipment?

A

Lock-out / tag-out

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29
Q

What is a secondary contaminant?

A

Contaminant that affects the anesthetics, such as taste color and odor

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30
Q

What is the correct way to disinfect a newly installed water main using the tablet method?

A

Chlorinated with a dose of 25mg/L, flush out highly chlorinated water from main, and perform bacteriological testing

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31
Q

What is cathodic protection?

A

Corrosion control to protect metals, such as pipelines and tanks

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32
Q

What is required when replacing a chlorine gas cylinder?

A

Always use a new lead gasket

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33
Q

What type of hardness can be removed by boiling the water?

A

Temporary hardness

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34
Q

Iron and manganese are classified as _______

A

Secondary contaminants

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35
Q

What is used as a preservative for a water sample, collected for lead and copper analysis?

A

Nitric acid

36
Q

What is the purpose of priming a pump?

A

To fully submerge the impeller in water and remove the air inside the pump

37
Q

Which is a mechanical coupling?
Flange, Victaulic, push-on, Bell and spigot

A

Victaulic

38
Q

What is chlorine residual?

A

Free uncombined and all chlorine compounds with disinfecting properties.

39
Q

What terminology refers to the depression of water table near a well during pumping?

A

Cone of depression

40
Q

What is an aquifer with impermeable layers above and below it?

A

Confined aquifer

41
Q

What is the benefit of looping a water main?

A

Improves water quality and flow

42
Q

Definition of a public water system

A

Water system with at least 15 service connections or regularly serves an average of 25 individuals daily for at least 60 days out of the year

43
Q

What following pH is a strong acid?
1, 6, 8, 13

A

1

44
Q

What is used to identify the weaknesses of a water system if a disaster struck and recommends improvements to ensure reliability?

A

Vulnerability assessment

45
Q

What is a detailed evaluation of the water source and facilities to ensure the drinking water is protected from all pollution sources?

A

Sanitary survey

46
Q

What’s a moderately flexible pipe with smooth interior surface, good flow factor, light weight, and least susceptible to corrosion?

A

PVC pipe

47
Q

What would it indicate if the pH of water is 5?

A

Corrosive

48
Q

What is a specific capacity of a well?

A

Well yield per unit of drawdown

49
Q

What is the purpose of a lantern ring?

A

Distributes water uniformly around the shaft to provide lubrication and cooling, and provides seal water along the shaft

50
Q

What is one of the main benefits of using steel pipe in the distribution system?

A

Strength

51
Q

What is a preventative maintenence program?

A

Detecting and correcting problems before equipment breaks down

52
Q

Which backflow preventer is suitable for any type of cross-connection?

A

Reduced pressure zone backflow preventer

53
Q

What best describes a positive displacement water meter?

A

Measures the volume of water passing through the flowmeter by repeatedly entrapping water in order to measure flow

54
Q

Which water meter is a pressure-differential type?

A

Venturi

55
Q

What is the primary reason for installing a service lateral on a water main at a 45-degree angle?

A

To prevent sediments and air from entering the service lateral

56
Q

What is the purpose of installing a tracer wire with a new water main?

A

To locate the pipe after it has been backfilled

57
Q

Which water quality parameter(s) must be tested and obtained in the field, immediately after collecting a sample?

A

Chlorine residual, pH, and temperature

58
Q

What is the primary purpose of flushing a water main?

A

Improve water quality

59
Q

What is breakpoint chlorination?

A

Addition of chlorine to water until the chlorine demand has been satisfied

60
Q

Which is the most effective for removing encrustation in a water main?
Pigging, UV, Chlorinating, injecting sodium thiosulfate

A

Pigging

61
Q

If coliform bacteria is found in the water supply, what is most likely true?

A

Pathogens may also be in the water supply

62
Q

What is the most common disinfectant used in the water industry?

A

Free chlorine

63
Q

Which valve is used to release small pockets of air that gather at the high points of a pipeline?

A

Air release valve

64
Q

What is a water table?

A

Upper water surface of an unconfined aquifer

65
Q

What is applied to a new sample bottle in the field, before you collect a sample for total coliform?

A

Do nothing, new sample bottles are ready for use.

66
Q

What is true when collecting a sample for biological contaminants, such as total coliform?

A

Leave a one inch gap at the top of the bottle

67
Q

What is the action level for lead?

A

0.015 mg/L

68
Q

What could be used to increase alkalinity?

A

Calcium carbonate (CaCO3)

69
Q

If you are an attendant for a confined space entry, and notice that the authorized entrant needs assistance to evacuate the space, what’s your immediate response?

A

Summon rescue

70
Q

What causes Blue Baby Syndrome?

A

Nitrate

71
Q

What is the radius of influence?

A

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

72
Q

What best describes pumping water level?

A

The water level in a well when the pump is in operstion

73
Q

What best describes static water level?

A

The water level in a well when the pump is off

74
Q

What is a single sample of water, collected at a particular time and place?

A

Grab sample

75
Q

What is used to regulate the levels of iron and manganese in drinking water?

A

SMCL

76
Q

How long should you wait before you test a water sample for chlorine residual?

A

It must be tested immediately

77
Q

Which terminology refers to disease-causing microorganisms?

A

Pathogens

78
Q

What is alkalinity?

A

The capacity of water to neutralize an acid

79
Q

Drinking water standards are based on ________

A

Maximum Contaminant Level

80
Q

The Public Notification Rule requires a public water system to notify their customers regarding a(n) _______ as soon as practical, but no later than 24 hours after the public water system learns of the violation.

A

Acute violation

81
Q

Which rule was implemented to improve public health protection by reducing fecal pathogens to minimal levels in the drinking water supply?

A

Total Coliform Rule

82
Q

What is one of the requirements when a routine water sample tests positive for total coliform?

A

Collect a repeat sample from the same tap as the original sample. Additionally collect a repeat sample within 5 services upstream and a repeat sample within 5 services downstream of the same tap as the original sample

83
Q

Which terminology refers to the trickling of water from ground surface to the aquifer?

A

Percolation

84
Q

What is the differemce between MCL and SMCL?

A

MCLs are for substances that pose a threat to human health,while SMCLs are for those that affect the aesthetic qualities of drinking water

85
Q

What could be implemented to control and minimize corrosion?

A

Increase pH

D2 Practice Questions (3 decks)

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