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5th Class Power Engineering > Book 3 Chapter 17: Water Treatment > Flashcards

Book 3 Chapter 17: Water Treatment Flashcards

1
Q

The filtration method of water treatment will:
A) Soften the water
B) Act to remove suspended solids
C) Remove dissolved gases
D) Remove suspended liquids

A

B) Act to remove suspended solids

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2
Q

A sodium zeolite water softener will:
A) Completely remove the detrimental impurity
B) Not change the solubility of the impurity
C) Require backwashing at the end of the regeneration cycle
D) Make the impurity highly soluble

A

D) Make the impurity highly soluble

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3
Q

The regenerate most often used for regenerating a sodium zeolite softener is:
A) Sulfuric acid
B) Sodium hydroxide
C) Sodium chloride
D) Hydrogen chloride

A

C) Sodium chloride

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4
Q

The backwash cycle of a sodium zeolite softener regeneration will:
A) Flush out excess regenerate
B) Loosen or separate and flush the bed of trapped suspended matter
C) Allow the regenerate to exchange with the “elemental” impurity
D) Follow the rinse cycle of the regeneration

A

B) Loosen or separate and flush the bed of trapped suspended matter

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5
Q

Material trapped in the bed of a pressure filter is removed by:
A) Backwashing the filter
B) Heating the bed
C) Passing chemicals through the exhausted bed
D) Regenerating the bed with a regenerant

A

A) Backwashing the filter

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6
Q

Common methods of removing suspended solids from the boiler make-up water are:
A) Coagulators and softeners
B) Evaporators and screens
C) Softeners and settling tanks
D) Settling tanks and filters

A

D) Settling tanks and filters

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7
Q

Temporary hardness is caused by:
A) Calcium and magnesium sulfates
B) Suspended solids
C) Sulfates and bicarbonates
D) Calcium and/or magnesium bicarbonates

A

D) Calcium and/or magnesium bicarbonates

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8
Q

A sodium zeolite water softener causes:
A) Dissolved solids, as compounds, to be removed
B) Element, associated with a radical, to be removed and replaced with elemental sodium
C) Solubility of a dissolved solid impurity to be lowered
D) Brine to become insoluble

A

B) Element, associate with a radical, to be removed and replaced with elemental sodium

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9
Q

A method of treatment which is often used in conjunction with settling tanks is:
A) Deaeration
B) Zeolite softening
C) Lime soda softening
D) Filtration

A

D) Filtration

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10
Q

The zeolite inside a water softener is used to:
A) Rinse the softened water
B) Exchange sodium for calcium and magnesium
C) Exchange soda for calcium and magnesium
D) Regenerate the brine solution
E) Exchange calcium for magnesium

A

B) Exchange sodium for calcium and magnesium

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11
Q

Ion exchange systems remove:
A) Elemental impurities
B) Hydroxide
C) Sludge
D) Salts
E) Colloids

A

A) Elemental impurities

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12
Q

Two ways of controlling the total dissolved solids in a boiler are manual blowdown and:
A) Venting
B) Continuous blowdown
C) Chemical addition
D) Flocculent addition
E) Draining condensate

A

B) Continuous blowdown

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13
Q

Zeolite of a sodium zeolite softener may be discharged to the sewer during the:
A) Injection mode of regeneration
B) Slow rinse mode of regeneration
C) Backwash mode of regeneration
D) Fast rinse mode of regeneration
E) Service mode of the softener

A

C) Backwash mode of regeneration

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14
Q

The regenerant used to regenerate a sodium zeolite softener is:
A) Sodium chloride
B) Sodium carbonate
C) Hydrochloric acid
D) Sodium hydroxide
E) Caustic soda

A

A) Sodium chloride

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15
Q

A method of treatment that is often used in conjunction with settling tanks is:
A) Demineralizing
B) Filtration
C) Deaeration
D) Zeolite softening
E) Lime soda softening

A

B) Filtration

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16
Q

A sodium zeolite softener needs regeneration because:
A) Suspended solids plug the resin
B) The resin is exhausted
C) Ions in the resin are hard to remove
D) Ions get dirty and need to be flushed out
E) Corrosion might occur

A

B) The resin is exhausted

17
Q

A continuous blowdown line is:
A) Installed in the mud drum
B) Used to reduce the dissolved gases in the boiler
C) Used to reduce sludge
D) Used on every boiler
E) Installed in the steam drum

A

E) Installed in the steam drum

18
Q

Impurities are maintained in solution to prevent:
A) Corrosion
B) Foaming
C) Scaling and sludge formation
D) Priming
E) Poor combustion

A

C) Scaling and sludge formation

19
Q

The boiler blowdown should be used to:
A) Prevent scale formation
B) Reduce feedwater pressure
C) Control the total dissolved solids
D) Reduce steam pressure
E) Remove excess sodium sulfite

A

C) Control the total dissolved solids

20
Q

By completing routine chemical testing on the boiler waters you can ensure your water treatment program is helping to prevent:
A) Boiler fuel gas filters plugging
B) Corrosion, sludge, pitting, scaling
C) High temperatures in boiler feedwater
D) Excess steam production
E) Burner problems

A

B) Corrosion, sludge, pitting, scaling

21
Q

A possible reason that water out of the softener is hard:
A) The water into the softener is softer than expected
B) Too much salt in the brine tank
C) Water pressure is too high
D) Failure to regenerate the softener soon enough
E) The inlet filters are plugged

A

D) Failure to regenerate the softener soon enough

22
Q

Two types of chemical feed pumps are:
A) Back and continuous
B) Positive displacement and dynamic
C) Centrifugal and rotary
D) Inlet and outlet feed pumps
E) Plunger and electronic pulse

A

E) Plunger and electronic pulse

23
Q

Which tests should be used to verify quality of Potable water for drinking?
A) Chemical
B) Physical
C) Bacteriological
D) Microscopic
E) All of these are correct

A

E) All of these are correct

24
Q

Once a sample is taken, it should be protected from extreme temperatures, tested as soon as possible and protected from:
A) Handling
B) Movement
C) Sunlight
D) Any light
E) Magnetic waves

A

C) Sunlight

25
Q

Filters are frequently used in conjunction with ________ in which case most of the suspended impurities are removed.
A) Hot lime softeners
B) Settling tanks
C) Demineralizers
D) Sodium zeolite softeners
E) Dearators

A

B) Settling tanks

26
Q

Magnesium bicarbonate in the boiler feedwater produces:
A) Temporary hardness and permanent hardness
B) Temporary hardness, very high solubility
C) Temporary hardness, very low solubility
D) Permanent hardness, very high solubility
E) Permanent hardness, very low solubility

A

C) Temporary hardness, very low solubility

27
Q

Magnesium sulphate in the boiler feedwater produces:
A) Permanent hardness, low solubility
B) Permanent hardness, high solubility
C) Temporary hardness, high solubility
D) Temporary hardness, low solubility
E) Temporary hardness and permanent hardness

A

A) Permanent hardness, low solubility

28
Q

The four conditions that can occur within the boiler include all of the following except:
A) Corrosion
B) Scale
C) Mud
D) Erosion
E) Foaming

A

D) Erosion

29
Q

The regenerant most often used for regenerating a sodium zeolite softener is:
A) Calcium sulphate
B) Sulphuric acid
C) Sodium hydroxide
D) Hydrogen chloride
E) Sodium chloride

A

E) Sodium chloride

30
Q

Shot feeding involves the injection of boiler water treatment chemicals over a:
A) Relatively short period of time
B) Eight hour period
C) Twelve hour period
D) Relatively long period of time
E) Twenty-four hour period

A

A) Relatively short period of time

31
Q

The amount of chemicals fed to a boiler is dependent upon the:
A) Age of the boiler
B) Type of boiler
C) Amount of water in the boiler
D) Size of the boiler
E) Values derived from the boiler water tests

A

E) Values derived from the boiler water tests

32
Q

Calcium bicarbonate in the boiler feedwater produces:
A) Temporary hardness, very low solubility
B) Permanent hardness, very low solubility
C) Temporary hardness and permanent hardness
D) Temporary hardness, very high solubility
E) Permanent hardness, very high solubility

A

A) Temporary hardness, very low solubility

33
Q

The boiler blowdown procedure may be done about _________ times per day, each time for about 15 seconds, depending on the demand.
A) Five
B) One
C) Four
D) Two
E) Three

A

E) Three

34
Q

Calcium sulphate in the boiler feedwater produces:
A) Temporary hardness, low solubility
B) Permanent hardness, high solubility
C) Permanent hardness, low solubility
D) Temporary hardness and permanent hardness
E) Temporary hardness, high solubility

A

C) Permanent hardness, low solubility

5th Class Power Engineering (75 decks)

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