24-25 Boiler Testing Exam Q&A

24-25 BOILER TESTING EXAM Q&A 1.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 2. 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 3. 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 4. 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 5. 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 6. Boiler water with a pH of 6 is considered a) alkaline b) basic c) acidic d) neutral e) acceptable for boiler water 7. Which of the following is an example of suspended matter? a) sodium b) sand c) salt d) calcium e) magnesium 8. Which of the following is an example of dissolved solids? a) magnesium sulphate b) oxygen c) clay d) sand e) carbon dioxide 9. Temporary hardness in feedwater is caused by a) calcium sulphate b) sodium nitrate c) magnesium bicarbonate d) calcium carbonate e) magnesium sulphate 10. 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 11. 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 12. The result of adding Al2 (SO4)3 to the raw water is a) a higher pH b) floc c) corrosion d) pitting e) sublimation 13. 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 14. 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 + Na2 SO4 e) MgSO4 + Na2Z = 2MgZ + 2NaSO4 15. 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 16. The regenerant used to regenerate a cation demineralizer is a) hydrochloric acid b) sodium chloride c) caustic soda d) sodium hydroxide e) sulphuric acid 17. The regenerant used to regenerate an anion demineralizer is a) sodium hydroxide b) sulphuric acid c) sodium chloride d) hydrochloric acid e) sulfamic acid 18. 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 19. 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 20. 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 21. 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 22. 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 23. 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 24. 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 25. 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