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Plumbing Year 4 > Water F > Flashcards

Water F Flashcards

1
Q

what indicates hardness in water

A

dissolved calcium and magnesium in the water

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2
Q

what is the maximum pressure allowed at the fixture

A

550 kpa

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3
Q

when servicing a diaphragm flush valve what stops the flush cycle?

A

force in the upper chamber

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4
Q

what happens when a diaphragm flush valve finishes its cycle?

A

force in the upper chamber is higher then the lower chamber

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5
Q

which is a differential pressure backflow preventer?

A

RP

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6
Q

if a jet pump 2 pipe system is working close to lifting capacity, what options are available to you, to increase its capacity?

A

increase the suction side and drive line sizes

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7
Q

which is allowed to drain into a septic tank?

A

garbage grinder

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8
Q

what CCC protection device is required for a shampoo sink?

A

vacuum breaker

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9
Q

what causes back siphonage?

A

a fire truck using a fire hydrant

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10
Q

what method is used for lowering 100’ submersible pump down with pvc piping?

A

a truck with well pump hoist

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11
Q

the horizontal water service from the well is back-graded from the pitless adaptor, what will this cause?

A

loss of prime

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12
Q

what is the main problem with high rise buildings using downfeed system?

A

balancing the hot water

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13
Q

what prevents back siphonage on a flush valve for a WC?

A

vacuum breaker

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14
Q

what factors contribute to water’s ability to dissolve soluble material?

A

solubility of material,

time of contact

ph of water,

temperature of water

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15
Q

when using a pressure tank without air/water separation, how do you remove or vent gases from the water in the tank?

A

air volume control

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16
Q

the process by which air is brought into intimate contact with water is known as:

A

aeration

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17
Q

the process by which normal flow thru a filter bed is reversed, thus cleaning the bed is known as:

A

Backwashing

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18
Q

a gas widely used to disinfect water is:

A

chlorine

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19
Q

the amount of alkalinity present in water is normally measured by the:

A

PH scale

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20
Q

untreated water is known as ______ water:

A

raw

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21
Q

rainwater is normally:

a) corrosive
b) relatively soft
c) slightly acidic
d) all of the above

A

All of the above

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22
Q

the total hardness of water should not exceed _______ gpg in residential applications:

A

3.5 gpg

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23
Q

water heater temperature should not be set higher than 140 deg F in order to prevent ______ Hardness from precipitating out of solution:

A

temporary

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24
Q

temperature, taste, odour, and turbidity are all considered _______ characteristics of water:

A

physical

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25
Q

soft water is considered to have a hardness of less than _______ gpg:

A

1 gpg

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26
Q

the iron content of water should not exceed:

A

0.3 ppm

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27
Q

the simplest method for removing iron (0.3ppm or less) from water is by the use of:

A

water softener

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28
Q

when using spring water as your source, how do you collect water and protect it from contamination?

A

an impoundment box around the spring

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29
Q

the acceptable ph range for potable water is:

A

6.5-8.5

30
Q

a ph reading of 2.0 would be considered:

A

extremely acidic

31
Q

water containing H2S in excess of _____ mg/l is considered to be aesthetically objectionable:

A

.05 mg/l

32
Q

the best method for removing taste and odour problems from water is by the use of a:

A

activated carbon filter

33
Q

the maximum amount of e coli permitted in potable water is:

A

0 ppm

34
Q

waht type of treatment would a water softener be considered?

A

ion exchange

35
Q

which type of treatment kills bacteria when used and installed correctly?

A

chlorination

36
Q

reverse osmosis can be used to treat bacteriologic-ally unsafe water

T or F

A

false

37
Q

All piping downstream of a reverse osmosis unit must be plastic:

T or F

A

True (its acidic)

38
Q

which regeneration process provides fora better reserve in a water softener?

A

Up flow

39
Q

what is the recommended length of a regeneration cycle for water softeners?

A

3 days

40
Q

when sizing water softeners, 1 ppm of iron is equivalent to ______ gpg of hardness:

A

4

41
Q

when sizing water softners, 1 ppm of manganese is equivalent to _____ ppm of hardness:

A

8

42
Q

a water softener must always be installed ______ of a hot water heater:

A

upstream

43
Q

what is one of the most common reasons of why a RO system will continuously run water down the drain?

A

the ASO valve is broken

44
Q

a drilled well draws its water from an:

A

Aquifer

45
Q

a residential well using a submersible pump would normally have a casing ______ inches in diamter:

A

4”

46
Q

the distance in feet or meters that water lowers when being pumped is defined as:

A

drawdown

47
Q

what is the minimum grade of PE pipe approved for use in a pump drop pipe:

A

series 160

48
Q

a shallow well is normally defines as being no more than _______ feet

A

25’

49
Q

which of the following determines when the pump starts and stops?

A

pressure switch

50
Q

the most common type of pump used in the private water supply systems is:

A

centrifugal

51
Q

according to your modules; each stage of a submersible pump will produce _____ psi:

A

9

52
Q

what is the daily water requirement per person (US gal) used when sizing private water supply systems?

A

60 US Gal

53
Q

a spring will alsways supply high quality water:

T or F

A

high pressure

54
Q

centrifugal pumps that are piped in series will result in:

A

increased pressure

55
Q

the maximum practical lift at 2000 feet above sea level is:

A

23ft

56
Q

the amount of pressure an impeller will produce is mainly a function of its:

A

diameter

57
Q

the amount of flow an impeller will produce is mainly a function of its:

A

variable displacment

58
Q

a pump what will produce 345 ft will develop a pressure of ______ psi:

A

multiply by .433

149.39

59
Q

a centrifugal pump should cycle no more than _____ per hour

A

25

60
Q

what type of pump would be best suited for a fuel transfer station:

A

diaphragm

61
Q

what type of pump would be best suited for bodily fluids:

A

peristaltic

62
Q

what type of pump is best suited for adding chlorine to a water system?

A

metering

63
Q

a centrifugal pump works because of ________ principle:

A

bernoulli’s

64
Q

as high pressure enters the ejector of a jet pump, it passes thru the _____ and is converted to high velocity:

A

nozzle

65
Q

what converts the high velocity water jet pump ejector to high pressure?

A

venturi

66
Q

the larger of the two pipes on a deep well jet pump is the ______ line:

A

suction

67
Q

a pressure expressed in terms of a height of column of fluid in feet is defined as:

A

head

68
Q

what is the most likely cause of a pump turning on every time there is a demand for water?

A

pressure tank waterlogged

69
Q

normal pressure switch for residential use are:

A

30-50 psi

70
Q

a vacuum reading of 1”hg will lift water

A

1.13’

71
Q

a vacuum gauge on the suction side of a running pump would show ___________ if the foor valve was stuck closed:

A

high vacuum

72
Q

what prevents the water from draining out of the drop pipe when the jet pump stops running?

A

foot valve

Plumbing Year 4 (28 decks)

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