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3B1 > Ch. 11 > Flashcards

Ch. 11 Flashcards

1
Q
  1. Subsidence is accomplished by passing water through a basin or tank of such design that the velocity of the water is reduced to a point, to permit ___________.
    a. subsidence
    b. coagulation
    c. flocculation
    d. filtering
A

a. subsidence

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2
Q
  1. __________ are chemicals, which cause the fine particles to gather together into a larger mass, which will settle out much more readily.
    a. Caustic
    b. Coagulants
    c. Acids
    d. Zeolite
A

b. Coagulants

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3
Q
  1. ___________ is the further increase in size and volume of the precipitating particles and is done by gentle agitation of the water.
    a. Subsidence
    b. Coagulation
    c. Flocculation
    d. Filtering
A

c. Flocculation

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4
Q
  1. The coagulant, when added to the water, will produce a spongy substance known as _____.
    a. mud
    b. floc
    c. sand
    d. waste
A

b. floc

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5
Q
  1. A water _______ allows the coagulation and settling of suspended solids contained in water, to take place.
    a. softener
    b. exchanger
    c. clarifier
    d. filter
A

c. clarifier

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6
Q
  1. The clarified water is drawn off through a submerged collector pipe at the ______ of the upflow zone.
    a. bottom
    b. top
    c. side
    d. middle
A

b. top

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7
Q
  1. External water treatment using continuous methods of subsidence allows:
    1) Clarified water to be drawn continuously from the tank
    2) Continuous removal of solids from the tank
    3) Complete removal of turbidity
    4) Removal of colloidal particles without coagulation
    a. 1, 2, 3
    b. 1, 3, 4
    c. 1, 2, 4
    d. 2, 3, 4
    e. 1, 2, 3, 4
A

c. 1, 2, 4

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8
Q
  1. A _____ consists of a bed of porous material through which water is passed, either by gravity or under pressure.
    a. softener
    b. exchanger
    c. clarifier
    d. filter
A

d. filter

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9
Q
  1. When filtering water, which will be used for boiler feedwater, __________ is preferred as the use of sand may result in the water picking up silica, which could deposit as scale, in the boiler.
    a. resin
    b. gravel
    c. anthracite
    d. Zeolite
A

c. anthracite

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10
Q
  1. Pressure gauges, are installed on the inlet and outlet lines and when the pressure difference between them reaches a certain value, usually from ___ to ___ kPa, it means that backwashing is required.
    a. 5 , 10
    b. 35 , 55
    c. 100 , 200
    d. 1 , 10000
A

b. 35 , 55

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11
Q
  1. If filters are used alone, then _________ are usually fed to the filter in order that the finer impurities are formed into larger particles that can be trapped by the filter bed.
    a. caustic
    b. coagulants
    c. acids
    d. zeolite
A

b. coagulants

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12
Q
  1. Filters are required to remove the following impurities from feedwater:
    1) Dissolved oxygen
    2) Suspended matter
    3) Dissolved solids
    4) Sand and silt
    5) Turbidity
    a. 1, 3, 4
    b. 2, 4, 5
    c. 2, 3, 4
    d. 3, 4, 5
    e. 1, 2, 3,4
A

b. 2, 4, 5

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13
Q
  1. Chemical external water treatment is accomplished using:
    1) Zeolite softeners
    2) Demineralizers
    3) Hot lime soda softeners
    4) Deaerators
    a. 1, 2, 3, 4
    b. 1, 2, 4
    c. 1, 3, 4
    d. 2, 3, 4
    e. 1, 2, 3
A

e. 1, 2, 3

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14
Q
  1. The sludge blanket aids in the removal of any ________ not already precipitated from the water.
    a. impurities
    b. chemicals
    c. anthracite
    d. resins
A

a. impurities

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15
Q
  1. Calcium sulphate, in particular, is the main scale forming constituent found in boiler water and when ___________ out of solution on a hot metal surface, forms a hard dense scale.
    a. coagulated
    b. flocculated
    c. filtered
    d. precipitated
A

d. precipitated

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16
Q
  1. Chemical analysis has shown that the chief constituents of hard scales are ________ sulphate and calcium and magnesium silicates.
    a. calcium
    b. sodium
    c. magnesium
    d. water
A

a. calcium

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17
Q
  1. The hot lime-soda process is most suitable for the softening of _____ hardness supplies.
    a. low
    b. high
    c. medium
    d. average
A

b. high

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18
Q
  1. The hot process softener is used in conjunction with _______ filters, which are usually necessary to filter out any carryover of sludge particles from the softener.
    a. side-stream
    b. gravity
    c. pressure
    d. charcoal
A

c. pressure

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19
Q
  1. Natural, untreated water contains dissolved mineral salts.
    a. True
    b. False
A

a. True

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20
Q
  1. The mineral compound’s ______ contribute to deposits of scale and sludge.
    a. cations
    b. anions
    c. composition
    d. size
A

b. anions

21
Q
  1. The mineral compound’s _____ contribute to acidity/alkalinity (pH), corrosion and other problems.
    a. cations
    b. anions
    c. composition
    d. size
A

a. cations

22
Q
  1. The sodium zeolite softener uses the principle of _________ exchange to convert scale-forming salts, in the water, into non-scale forming salts.
    a. chemical
    b. ion
    c. composition
    d. size
A

b. ion

23
Q
  1. The softener contains a granular material called ______ , which has the ability, to remove the calcium and magnesium cations from the water and to replace them with sodium cations.
    a. caustic
    b. coagulants
    c. acids
    d. zeolite
A

d. zeolite

24
Q
  1. When the zeolite material has given up all its Na+ cations in exchange for the Ca2+ and Mg2+ cations, it has to be _________ before it can resume the softening process.
    a. exchanged
    b. replaced
    c. regenerated
    d. flushed
A

c. regenerated

25
Q
  1. The regeneration is done by removing the zeolite softener from service and filling it with a solution of ______ .
    a. acid
    b. brine
    c. caustic
    d. chlorine
A

b. brine

26
Q
  1. The sodium hydroxide may cause _________ of the boiler metal.
    a. scaling
    b. embrittlement
    c. cracking
    d. weakening
A

b. embrittlement

27
Q
  1. A hydrogen zeolite softener is used to remove the scale forming _____ , without the formation of sodium bicarbonate.
    a. salts
    b. carbonic
    c. magnesium
    d. sulphates
A

a. salts

28
Q
  1. When the resin becomes exhausted of_____ ions, it is regenerated. Sulphuric acid is passed through the resin.
    a. calcium
    b. sodium
    c. hydrogen
    d. positive
A

c. hydrogen

29
Q
  1. The de-gasifier tower used in some external water treatment programs:
    a. Removes oxygen from the make up water
    b. Removes carbon dioxide from the effluent of hydrogen Zeolite unit
    c. Adds oxygen to the make up water to aid deaeration
    d. Is installed in the system before the softeners
    e. Removes carbon dioxide from the effluent of the anion unit
A

b. Removes carbon dioxide from the effluent of hydrogen Zeolite unit

30
Q
  1. Dealkalization processes reduce ________, principally carbonate and bicarbonate anions.
    a. salts
    b. carbonic
    c. magnesium
    d. alkalinity
A

d. alkalinity

31
Q
  1. The weak acid cation dealkalizer uses cation exchange resin that is _________ with either hydrochloric or sulphuric acid, leaving hydrogen ions on the exchange sites.
    a. exchanged
    b. replaced
    c. regenerated
    d. flushed
A

c. regenerated

32
Q
  1. The _______ process, and the associated chemical reactions of a weak acid cation dealkalizer, is similar to a hydrogen zeolite softener.
    a. exchanging
    b. replacement
    c. regeneration
    d. flushing
A

c. regeneration

33
Q
  1. The water coming out of the weak acid cation dealkalizer contains the residual (non-exchanged) hardness ions and carbon dioxide. This carbon dioxide, due to its potential to cause corrosion problems on the piping systems and downstream equipment, is degasified.
    a. True
    b. False
A

a. True

34
Q
  1. In water treatment, demineralization refers to the removal of all mineral salts, using ______ exchangers.
    a. chemical
    b. ion
    c. composition
    d. size
A

b. ion

35
Q
  1. All demineralization systems consist of a minimum of one cation exchange process and one anion exchange process.
    a. True
    b. False
A

a. True

36
Q
  1. Strong ______ exchangers are required for silica removal.
    a. cation
    b. anion
    c. acid
    d. caustic
A

b. anion

37
Q
  1. If allowed to remain in the water, _______ acid will break down into carbon dioxide, which causes corrosion.
    a. sulphuric
    b. hydrochloric
    c. carbonic
    d. silicic
A

c. carbonic

38
Q
  1. Each ion exchanger, in a demineralization system, must be regenerated when its _____ becomes exhausted.
    a. chemical
    b. ion
    c. composition
    d. resin
A

d. resin

39
Q
  1. The mixed bed exchanger is a mixture of strong acid cation and strong base anion _____.
    a. chemical
    b. ion
    c. composition
    d. resin
A

d. resin

40
Q
  1. When a mixed-bed ion exchange softener is exhausted and backwashed the anion resin will:
    a. Separate and drop to the bottom
    b. Separate and rise to the top
    c. Mix uniformly throughout the bed
    d. Remain unchanged in the vessel
    e. Change to cation resin in the vessel
A

b. Separate and rise to the top

41
Q
  1. Water, with a high concentration of suspended solids, is pressurized and forced through a number of membrane modules connected in parallel is called osmosis.
    a. True
    b. False
A

b. False

42
Q
  1. Reverse osmosis can achieve a __ % removal of dissolved salts, in water.
    a. 100
    b. 55
    c. 99
    d. 80
A

c. 99

43
Q
  1. In a ______ type deaerator, the entering water passes through spray nozzles, which divide it into a fine state.
    a. spray
    b. tray
    c. bubbler
    d. combination
A

a. spray

44
Q
  1. The spring-loaded valve maintains even distribution of water spray through a ____ range of flow variation.
    a. narrow
    b. wide
    c. large
    d. small
A

b. wide

45
Q
  1. In a _____ deaerator, the water flow is broken up by trickling down over a series of trays.
    a. spray
    b. tray
    c. bubbler
    d. combination
A

b. tray

46
Q
  1. In a _______ deaerator, steam is forced up through perforated panels as the water flows along the top surface of the panel.
    a. spray
    b. tray
    c. bubbler
    d. combination
A

c. bubbler

47
Q
  1. In periods of low flow, steam may condense and the level will creep up. In this case, an __________ valve will open to prevent the water from rising above the level where proper deaeration can occur.
    a. level
    b. overflow
    c. steam
    d. water
A

b. overflow

48
Q
  1. To reduce corrosion caused by oxygen, it is desirable to keep the level of dissolved oxygen in the water, at about _____ ppb (parts per billion).
    a. 10/20/2006
    b. 50-100
    c. 5/7/2006
    d. 0-3
A

c. 5/7/2006

3B1 (15 decks)

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