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My Study Qs > Water > Flashcards

Water Flashcards

1
Q

Hydro pneumatic or pressure-tank water systems are suitable for ..

A

small communities, housing developments, private homes, and estates, camps, food services opertaions, and hotels

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2
Q

The hydro pneumatic tank typically contains ___ of its volume as water.

A

20 percent

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3
Q

Water containing nitrates generally indicates…

A

evidence of previous pollution

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4
Q

Hydrogen sulfide can be fatal at exposure of

A

300ppm

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5
Q

Back siphonage is prevented by all of the following except:
a. barometric loop
b. vacuum breaker
c. air gap separation
d. back pressure units

A

a. barometric loop

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6
Q

Of the following, which is not a variable to be considered when deciding upon a safe distance between a well and a sewage disposal system?
a. well construction
b. the number of individuals using the well
c. the volume, strenght, type and dispersion of polluted material
d. soil and texture

A

B. the number of individuals using the well

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7
Q

Microbial pollution travels only a short distance through

A

dried out cracked clay

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8
Q

Typically an abundant supply of ground water may be yielded from

A

sedimentary rock

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9
Q

Which of the following is used to properly seal a drilled well to prevent contamination of the water supply?
a. epoxy
b. bentonite clay
c. grouting
d. a runner seal

A

C. grouting

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10
Q

Which of the following compounds would not contribute to water hardness?
a. calcium sulfate
b. magnesium sulfate
c. calcium chloride
d. sodium chloride

A

d. sodium chloride

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11
Q

The quiescent settling of water such as would occur in a reservoir, lake, or basin without the aid of a chemical is known as

A

plain sedimentation

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11
Q

Which of the following is not a commonly accepted method or device to prevent back siphonage:
a.vacuum breaker
b.cross connections
c. air gap separation
d. back pressure units

A

B. cross-connections

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12
Q

Which of the following compounds can be used full strength to disinfection:
a. perchloron
b. calcium hypochlorite
c. chlorinated lime
d. sodium hypochlorite

A

d. sodium hypochlorite

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13
Q

The presence of which of the following elements in water treatment plant effluent is used as a measure of filtration efficiency?
a. copper
b. aluminum
c. zinc
d. lead

A

b. aluminum

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14
Q

Proper disinfection of water using chlorine depends on the concentration of chlorine plus which of the following?
a. temperature of the water
b. pH of the water
c. contact period time
d. all of the above

A

d. All of the above

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15
Q

Which of the following is used to control the growth of algae and protozoa?
a. copper sulfate
b. aeration
c. nitrates
d. filtration

A

d. filtration

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16
Q

Granular activated carbon (GAC) filters are used to
a. treat water for soft drinks
b. remove taste and odor
c. remove synthetic organic chemicals
d. all of the above

A

d. all of the above

GAC removes only taste and odors and chemicals. GAC cannot remove metals

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17
Q

Trihalomethanes are synthetic organic chemicals primarily created pre or post chlorination?

A

during the pre-chlorination process

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18
Q

Often over 90% of sodium arsenate can be removed by
a. filtration
b. coagulation
c. ion exchange
d. all of the above

A

b. coagulation

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19
Q

The Langelier index is used to determine the point of stability of

A

calcium carbonate

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20
Q

A well casing should be equipped with a vent and installed…

A

with concrete as grout

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21
Q

Cross connections are frequent causes of diseases resulting from
a. back siphonage of contaminated chemicals
b. back flow of biologically contaminated liquids
c. connection of the water supply to the sewer system
d. all of the above

A

d. all of the above

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22
Q

The flushometer valve is typically protected by…

A

a non pressure type vacuum breaker

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23
Q

When using pre-settling reservoirs to eliminate heavy turbidity or pollution before treatment, what is the desirable retention time?
a. 8 hours
b. 1 week
c. 2 to 3 days
d. 1 month or longer

A

c. 2 to 3 days

24
Q

If sufficient amounts of activated carbon in the powdered form are used, practically all tastes and odors are removed from water by
a. absorbotion
b. polymerization
c. adsorbtion
d. oxidation

A

c. adsorbtion

activated carbon ADSORBS the tastes and odors

25
Q

It has been estimated that waterborne diseases worldwide accounts for…

A

250 million illnesses per year

26
Q

Leaching from a garbage dump has been found to pollute wells how far away

A

2,000 feet away

26
Q

Residential cespool and septic tank soil absorbtion system discharge…

A

400 million gallons of sewage into the ground each year

27
Q

Alkalinity of water is desirable at levels of
a. 0 to 30 mg/l
b. 0 to 500 mg/l
c. 30 to 100 mg/l
d. 0 to 5 mg/l

A

c. 30 to 100 mg/l

28
Q

Which of the following is not included in the nine contaminate groups?
a. mircroorganisms
b. volatile organic chemicals
c. turbidity
d. lead and copper
e. nitrate and nitrite

A

a. microorganisms

29
Q

What is the required annular seal depth for a domestic water supply well?

A

20 ft

30
Q

Choose which protozoa are commonly found in untreated surface water?

a. Giardia
b. Crypto
c. Legionella
d. E. Coli
e. a and b
f. c and d

A

e. a and b

Giardia and crypto

but also Naegleria, Entemoeba histolytica, Toxoplasma gondii

31
Q

What are some waterborne bacterias?

A
  • Psuedomonas aeruginosa
  • Legionella pneumophila
  • Salmonella typhi
  • Salmonella paratyphi
  • Campylobacter jejuni
  • Shigella
  • Vibrio cholera
  • E. coli 0157:H7
32
Q

What are some waterborne viruses?

A
  • Enteroviruses
  • Rotavirus
  • Norwalk virus
  • Hepatitis A
33
Q

What is the MCL for Arsenic?

A

0.01 mg/l

34
Q

What is the MCL for Copper?

A

1.3 mg/l

35
Q

What is the MCL for Lead?

A

0.015 mg/l

36
Q

1 mg/l = __ ppm ?

A

1 mg/l = 1 ppm

37
Q

1 ppm = __ ppb ?

A

1 ppm = 1000 ppb

38
Q

1 ppb = __ ppm ?

A

1 ppb = 0.001ppm

0.001 x 1000 = 1

39
Q

What is the MCL for Gross Alpha?

A

15 pCi/l

40
Q

A 4-Log removal system must remove
a. 90% of pathogens
b. 99% of pathogens
c. 99.9% of pathogens
d. 99.99% of pathogens

A

d. 99.99% of pathogens

41
Q

A BAT for Uranium is
a. Ion exchange (IX)
b. Granular activated carbon (GAC)
c. Oxidation
d. The Manhattan Project

A

a. Ion exchange (IX)

42
Q

Air stripping is a type of treatment used to remove
a. TTHMs
b. Arsenic
c. Nitrate
d. Uranium

A

a. TTHMs

43
Q

The number of bacT samples that a CWS must collect is based upon
a. Service area in acres
b. Population
c. Amount of water produced in MGD
d. Number of service connections
e. a and c
f. b and d

A

f. b and d

44
Q
  1. What is the required annular seal depth for a public water supply well?
    a. 1 year
    b. 55 feet
    c. 20 feet
    d. 50 feet
A

d. 50 feet

45
Q

What is the minimum pressure that a PWS is required to meet?
a. 20psi
b. 15psi
c. 5psi
d. PSI Miami

A

a. 20psi

46
Q

Which is considered a BAT for Nitrate removal?
a. Activated Alumina
b. Ketogenesis
c. Reverse Osmosis (RO)
d. Air Stripping

A

c. Reverse Osmosis (RO)

47
Q

What are two major groups of Disinfectant Byproducts?
a. Coliforms
b. Halo Acetic Acids
c. Patrites
d. Trihalomethanes
e. a and b
f. b and d

A

f. b and d

48
Q

What is the MCL for Arsenic?
a. 10ppm
b. 10ppb
c. 5ppm
d. 5ppb

A

b. 10ppb

Arsenic mcl is 0.01 ppm,
0.01 x 1000 = 10 ppb

49
Q

The disinfection ability of chlorine is affected most by
a. BOD
b. temperature
c. hydrogen ion concentration
d. dissolved oxygen

A

c. hydrogen ion concentration

50
Q

What are the three forms of Alkalinity?

A

bicarbonate
hydroxide
hypochlorite

51
Q

The main function of a sand filter is to:

A

remove suspended solids

52
Q

According to the SDWA, the minimum number of water samples which must be submitted for bacteriological analysis for a public water supply depends upon the:

a. daily population served
b. population served
c. areas of the raw water supply
d. amount of water treated

A

b. population served

53
Q

If hard water is softened by the ion exchange method, which one of the following will increase?

a. dissolved oxygen
b. iron
c. p1-1
d. sodium

A

d. sodium

54
Q

Aearation is advantageous in the treatment of water containing:

A

dissolved iron and maganese

55
Q

The pH of a solution in which the apparent hydrogen ion concentration is equal to 10-8 moles per liter is …

A

8

56
Q

What is used for coagulation?

A

aluminum sulfate

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