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22 Cards in this Set
- Front
- Back
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The regenerant used to regenerate a cation exchanger in a demineralized is A. Hydrochloric acid B. Sodium chloride C. Caustic soda D. Sulphuric acid |
D. Sulphuric acid |
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A normal operating pressure range for a deaerator is __________ kPa. A. 70 to 100 B. 30 to 50 C. 100 to 150 D 10 to 25 |
A. 70 to 100 |
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Which of the following is not a type of coagulant? A. Aluminium sulphate B. Aluminium hydroxide C. Sodium aluminate D. Calcium chloride |
D. Calcium chloride |
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Boiler water should have a ________ pH value. A. 7 B. 8.5 C. 10 D. 10.5 |
D. 10.5 |
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The chemical equation that represents the modification of bicarbonates in hard water by the use of a zeolite softener is: 1) Ca(HCO₃)₂ + Na₂Z = CaZ + 2NaHCO₃ 2) CaZ + 2NaCl = Na₂Z + CaCl₂ 3) MgSO₄ + Na₂Z = MgZ + Na₂SO₄ 4) Ca(HCO₃)₂ + Na₂Z = CaZ + NaHCO₃ 5) MgZ + 2NaCl = Na₂ + MgCl₂ |
1) Ca(HCO₃)₂ + Na₂Z = CaZ + 2NaHCO₃ |
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The capacity of a sodium zeolite softener will drop due to zeolite attrition at about _____ per year. 1) 1% 2) 7% 3) 3% 4) 15% 5) 5% |
3) 3% |
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The main purpose for chemically treating boiler feedwater is to: 1) Decrease the amount of chemicals used externally 2) Increase heat transfer 3) Get rid of the scale forming impurities in the feedwater 4) Produce a cleaner and more pure steam 5) Prevent rust from forming in the boiler surfaces |
3) Get rid of the scale forming impurities in the feedwater |
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The regenerator used to regenerate an anion demineralizer is: 1) Sodium hydroxide 2) Sulphuric acid 3) Hydrochloric acid 4) Sulfamic acid 5) Sodium chloride |
1) Sodium hydroxide |
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The aluminum compounds when added to water to form floc in a clarifying system are known as: 1) Thickeners 2) Congealants 3) Dispersants 4) Flocs 5) Coagulants |
5) Coagulants |
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The result of adding Al2(SO4)3to the raw water is: 1) Sublimation 2) Pitting 3) Floc 4) Corrosion 5) A higher pH |
3) Floc |
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Boiler water with an alkalinity that is too high will likely: 1) Have a lot of scale 2) Have a low pH 3) Show signs of pitting 4) Have grooving on its surfaces 5) Foam |
5) Foam |
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When using a sodium zeolite water softener, the modification of the sulphate in hard water is shown by the chemical equation: 1) MgZ + 2NaCl = Na₂ + MgCl₂ 2) Ca(HCO₃)₂ + Na₂Z = CaZ + 2NaHCO₃ 3) CaZ + 2NaCl = Na₂Z + CaCl₂ 4) MgSO₄ + Na₂Z = MgZ + Na₂SO₄ 5) MgSO₄ + Na₂Z = 2MgZ + 2NaSO₄ |
4) MgSO₄ + Na₂Z = MgZ + Na₂SO₄ |
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Lime-soda softeners: 1) Must be backwashed periodically 2) Remove the scale forming dissolved solids 3) Remove all dissolved solids and gases from the water 4) Changes the pH of the water 5) Remove all dissolved solids from the water |
2) Remove the scale forming dissolved solids |
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Suspended matter must be removed from feedwater to: 1. Avoid overheating of the boiler metal 2. Prevent foaming in the boiler 3. Keep the steam pure 4. Eliminate the formation of lethal gases 1) 2, 3, 4 2) 1, 3, 4 3) 1, 2, 3 4) 1, 2, 4 5) 2, 3 |
3) 1, 2, 3 |
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In a zeolite water softener, the scale forming salts are: 1) Completely removed 2) Blown out 3) Filtered out 4) Absorbed by the zeolite 5) Changed into non-scale forming sodium salts |
5) Changed into non-scale forming sodium salts |
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Zeolite of a sodium zeolite softener may be discharged to the sewer during the: 1) Slow rinse stage of regeneration 2) Backwash stage of regeneration 3) Service stage 4) Fast rinse stage of regeneration 5) Injection stage of regeneration |
2) Backwash stage of regeneration |
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Pitting of boiler metal may be prevented by: 1) Heating the boiler feed water to between 80 and 105ºC before it enters the boiler 2) The addition of sodium chloride to the feed water 3) Cooling the feeder water to between 4 and 16ºC 4) The addition of sodium sulphate to the feed water 5) Agitating the feed water before it enters the boiler |
1) Heating the boiler feed water to between 80 and 105ºC before it enters the boiler |
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In order to prevent the waste of steam through a deaerator vent, the component used is a: 1) Vent condenser 2) Chevron drier 3) Scrubber 4) Cyclone separator 5) Dry pipe |
1) Vent condenser |
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Hot lime-soda softeners: 1) Are mostly used in small heating plants 2) Will remove all dissolved solids from the water 3) Are only used when using well water 4) Are used mostly in large power plants 5) Can treat larger quantities of water than the cold process type |
5) Can treat larger quantities of water than the cold process type |
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Boiler water is treated in order to prevent: 1) Foaming, carryover, pitting, corrosion 2) Sludge, corrosion, scale, carryover 3) Foaming, corrosion, carryover, sludge 4) Scale, sludge, mud, pitting 5) Sludge, mud, pitting, corrosion |
2) Sludge, corrosion, scale, carryover |
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If you do not give the boiler water proper treatment, your boiler could suffer from: 1. Carryover 2. Furnace deposits 3. Sludging 4. Scale 5. Steam blanketing 6. Corrosion 1) 2, 3, 5, 6 2) 1, 3, 4, 6 3) 1, 2, 3, 4 4) 1, 4, 5, 6 5) 1, 2, 5, 6 |
2) 1, 3, 4, 6 |
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Sodium zeolite softeners: 1) Remove all dissolved solids from the water 2) Are regenerated with an alkaline solution 3) Remove all dissolved solids and suspended matter from the water 4) Are regenerated with an acid solution 5) Remove calcium and magnesium from the water |
5) Remove calcium and magnesium from the water |
