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30 Cards in this Set
- Front
- Back
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Boiler water is treated in order to prevent a) sludge, mud, pitting, corrosion b) foaming, corrosion, carryover, sludge c) sludge, corrosion, scale, carryover d) scale, sludge, mud, pitting e) foaming, carryover, pitting, corrosion |
c) sludge, corrosion, scale, carryover |
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Dissolved solids in raw water a) cause pitting of boiler surfaces b) cause grooving of piping surfaces c) are organic matter d) cannot be removed with filters e) cause corrosion of boiler surfaces |
d) cannot be removed with filters |
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Boiler surfaces may have what appears to be blisters which are composed of a) iron oxide b) sodium sulphite c) caustic soda d) ferric sulphate e) chelates |
a) iron oxide |
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Boiler water with an alkalinity that is too high will likely a) have a lot of scale b) show signs of pitting c) have a low pH d) foam e) have grooving on its surfaces |
d) foam |
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Corrosion products in feedwater can cause a) slag deposits in superheaters b) decreased steam pressure c) increased steam pressure d) increase in boiler efficiency e) tube failure |
e) tube failure |
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Boiler water with a pH of 6 is considered a) alkaline b) basic c) acidic d) neutral e) acceptable for boiler water |
c) acidic |
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Which of the following is an example of suspended matter? a) sodium b) sand c) salt d) calcium e) magnesium |
b) sand |
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Which of the following is an example of dissolved solids? a) magnesium sulphate b) oxygen c) clay d) sand e) carbon dioxide |
a) magnesium sulphate |
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Temporary hardness in feedwater is caused by a) calcium sulphate b) sodium nitrate c) magnesium bicarbonate d) calcium carbonate e) magnesium sulphate |
c) magnesium bicarbonate |
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Feedwater for a high pressure boiler should be a) treated with phosphate b) treated with phenolphthalein c) treated city water d) treated with salt e) softened water |
e) softened water |
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A method of treatment which is often used in conjunction with settling tanks is a) deaeration b) zeolite softening c) demineralizing d) lime soda softening e) filtration |
e) filtration |
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The result of adding Al2(SO4)3 to the raw water is a) a higher pH b) floc c) corrosion d) pitting e) sublimation |
b) floc |
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The chemical equation which represents the modification of bicarbonates in hard water by the use of a zeolite softener is a) Ca(HCO3)2 + Na2Z = CaZ + 2NaHCO3 b) CaZ + 2NaCl = Na2Z + CaCl2 c) MgSO4 + Na2Z = MgZ + Na2SO4 d) Ca(HCO3)2 + Na2Z = CaZ + NaHCO3 e) MgZ + 2NaCl = Na2 + MgCl2 |
a) Ca(HCO3)2 + Na2Z = CaZ + 2NaHCO3 |
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When using a sodium zeolite water softener, the modification of the sulphates in hard water is shown by the chemical equation a) MgZ + 2NaCl = Na2 + MgCl2 b) Ca(HCO3)2 + Na2Z = CaZ + 2NaHCO3 c) CaZ + 2NaCl = Na2Z + CaCl2 d) MgSO4 + Na2Z = MgZ + Na2SO4 e) MgSO4 + Na2Z = 2MgZ + 2NaSO4 |
d) MgSO4 + Na2Z = MgZ + Na2SO4 |
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During the regeneration of a sodium zeolite water softener in the "Rinse" stage, the item(s) going to the sewer is/are a) calcium sulphate b) sulphates and bicarbonates c) calcium and magnesium ions d) sodium bicarbonates and sulphates e) magnesium bicarbonate |
c) calcium and magnesium ions |
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The regenerant used to regenerate a cation demineralizer is a) hydrochloric acid b) sodium chloride c) caustic soda d) sodium hydroxide e) sulphuric acid |
e) sulphuric acid |
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The regenerant used to regenerate an anion demineralizer is a) sodium hydroxide b) sulphuric acid c) sodium chloride d) hydrochloric acid e) sulfamic acid |
a) sodium hydroxide |
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Zeolite of a sodium zeolite softener may be discharged to the sewer during the a) injection stage of a regeneration b) service stage c) slow rinse stage of a regeneration d) fast rinse stage of a regeneration e) backwash stage of a regeneration |
e) backwash stage of a regeneration |
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The capacity of a sodium zeolite softener will drop due to zeolite attrition at about a) 5% per year b) 3% per year c) 15% per year d) 1% per year e) 7% per year |
b) 3% per year |
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Filters are used a) for external water treatment b) to remove dissolved solids c) to remove calcium bicarbonates d) for internal treatment e) to remove hardness |
a) for external water treatment |
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Water filters must be cleaned a) if the water becomes hard b) when the dissolved solids are high c) by backwashing the filter media d) by chemically cleaning the filter media e) once per shift |
c) by backwashing the filter media |
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Coagulants added to water a) make the water soft b) will remove fine particles more readily c) remove the dissolved solids d) causes the fine particles to float to the surface e) remove chemicals not used up |
b) will remove fine particles more readily |
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Lime-soda softeners a) remove all dissolved solids from the water b) must be backwashed periodically c) remove all dissolved solids and gases from the water d) changes the pH of the water e) remove the scale forming dissolved solids |
c) remove all dissolved solids and gases from the water |
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Hot lime-soda softeners a) can treat larger quantities of water than the cold process type b) will remove all dissolved solids from the water c) are mostly used in small heating plants d) are only used when using well water e) are used mostly in large power plants |
a) can treat larger quantities of water than the cold process type |
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Sodium zeolite softeners a) remove all dissolved solids from the water b) remove calcium and magnesium from the water c) are regenerated with an acid solution d) are regenerated with an alkaline solution e) remove all dissolved solids and suspended matter from the water |
b) remove calcium and magnesium from the water |
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Mechanical deaeration a) removes the dissolved gases from the water b) is done with the aid of chemicals c) is used to remove calcium and magnesium from the water d) is used to remove oxygen only e) removes all dissolved gases and solids from the water |
a) removes the dissolved gases from the water |
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Pitting of boiler metal may be prevented by a) heating the boiler feed water to between 80 and 105 degrees Celsius before it enters the boiler b) cooling the feed water to between 4 and 16 degrees Celsius c) the addition of sodium chloride to the feed water d) agitating the feed water before it enters the boiler e) the addition of sodium sulphate to the feed water |
a) heating the boiler feed water to between 80 and 105 degrees Celsius before it enters the boiler |
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The zeolite inside a water softener is used to a) regenerate the brine solution b) rinse the softened water c) exchange sodium for calcium and magnesium d) exchange soda for calcium and magnesium e) exchange calcium for magnesium |
c) exchange sodium for calcium and magnesium |
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In order to prevent the waste of steam through a deaerator vent, the component used is a a) cyclone separator b) chevron drier c) scrubber d) vent condenser e) dry pipe |
d) vent condenser |
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A normal operating pressure range for a deaerator is a) 70 to 100 kPa b) 30 to 50 kPa c) 100 to 150 kPa d) 10 to 25 kPa e) 5 to 35 kPa |
a) 70 to 100 kPa |
