Reviewer-IChem (1).docx

**PART I. MULTIPLE CHOICE** **Directions: Choose the letter of the correct answer.** 1. Which of the following elements has a high concentration in boiler water? A. Soda B. Oxygen C. Hydrogen D. **Salt** 2. To minimize water corrosion, boiler water must be kept in wh...

**PART I. MULTIPLE CHOICE** **Directions: Choose the letter of the correct answer.** 1. Which of the following elements has a high concentration in boiler water? A. Soda B. Oxygen C. Hydrogen D. **Salt** 2. To minimize water corrosion, boiler water must be kept in what condition? E. **Alkaline** F. Slightly Acidic G. Neutral H. Pure Freshwater 3. Phosphate is used in the chemical treatment of boiler water for what specific reason? I. Control alkalinity and neutralize vanadium J. **Convert scale-forming to relatively harmless sludges** K. Neutralize the harmful effects of hydrogen embrittlement L. Decrease dissolved oxygen content 4. Which of the following could cause foaming and moisture carry over in a boiler? M. Excessive number of dissolved solids in the boiler water N. Excessive acidity level in the boiler water O. Inadequate amount of dissolved oxygen in the boiler water P. Inadequate alkalinity content of the boiler water 5. Which of the following conditions increases hardness of boiler water? Q. Inadequate amount of dissolved oxygen in the boiler water R. Excessive acidity level in the boiler water S. **Excessive number of dissolved solids in the boiler water** T. Inadequate alkalinity content of the boiler water 6. Standard hardness value is kept less than 1 Mg of CaCo3 per liter. Which of the following procedures shall be done to remove hardness from the boiler water? U. **Use various phosphoric acid-based chemicals in the blow-down process of boiler** V. Dissolve chlorine tablets in water W. Dilute at least 40% solution of sodium to 1000 liters of distilled water X. Blow down boiler water to 50% capacity to be replenished by low acidic water 7. As the PH of the boiler water becomes zero, as an officer in charge, it is your duty to report it to the chief engineer that the water is increasingly becoming \_\_\_\_\_\_\_\_\_. Y. Alkaline Z. Neutral A. **Acidic** B. Soft 8. What property is measured by testing the boiler water for chloride content? **U** C. Total alkalinity in the water D. Phosphates present in the water E. Methyl orange that should be added F. **Dissolved salts from sea contamination** 9. Which of the following is the best conductor of heat in a marine boiler? **U** G. Steel H. **Water** I. Steam J. Brick 10. Heavy slagging and high temperature corrosion of the boiler tubes can result from using a fuel oil with high amount what contaminant? **U** K. Ash L. **Sodium Chloride Salts** M. Vanadium Salts N. Sulfur 11. What type of heat exchanger is used to heat the boiler feed water by means of waste gas as it passes from the boiler to the stack? **U** O. **Economizer** P. Close condenser Q. Oil heaters R. Freshwater heat 12. Which condition could cause the feed pump of an auxiliary boiler to lose suction? **AN** S. Increased suction head pressure T. Decreased feed water temperature U. Pump recirculating line being open to much V. **Excessive feed water temperature** 13. Which condition will likely happen if you perform boiler surface blow down? W. It will remove most precipitated solids X. **It will remove floating impurities from boiler water** Y. It will disrupt circulation in a steaming boiler Z. It will have no effect in boiler alkalinity 14. Why is carbon dioxide gas dissolved in boiler water dangerous? A. **It forms carbonic acid which attacks watersides** B. It breaks the magnetic iron oxide films inside boiler tubes C. It combines with sulphate to cause severe waterside pitting D. It combines with oxygen to cause severe waterside scaling 15. Which element should be considered for water in a steaming auxiliary boiler to be tested daily? E. Dissolved Oxygen F. **Chlorides** G. Sludge H. Dissolved Nitrogen 16. What corrective action is required when the boiler water test result shows low conductivity? I. Perform Surface Blow J. Add Boiler Compound K. **No action shall be done** L. Add Disodium Phosphate 17. What does boiler water pH reading equal to 7 indicate? M. Acidic N. **Neutral** O. Oily P. Alkaline 18. Which of the following is consist of particles of water leaving the boiler together with the steam? Q. **Carry-Over** R. Superheated S. Feed Water T. Condensate 19. The phenolphthalein indicator is used to test which boiler water property? U. Dissolved Oxygen V. **Alkalinity** W. Chloride Content X. Hardness 20. What should be done to reduce the amount of oxygen content in the boiler water? **U** Y. **Adding hydrazine** Z. Bottom blow down the boiler A. Adding phosphate B. Surface blow down of the boiler 21. To have an efficient operation of boiler, what factors should be taken into considerations? **AN** C. Warming up of boiler quickly D. By-pass air heaters E. **Proper boiler water conditioning** F. Good blending of oil 22. Water inside boiler is basically utilized for generating \_\_\_\_\_\_\_\_\_\_\_\_\_. G. Power H. Electricity I. **Steam** J. Current 23. Which of the following is not a result of excess of impurity in boiler -- feed? K. Scale and Sludge Formation L. **Decomposition** M. Corrosion, Priming and Foaming N. Caustic Embrittlement 24. Which of the following areas in the engine room can you NOT take sample of engine cooling water? O. Jacket cooling P. Piston cooling Q. **Fuel oil valves** R. Heat ex changer 25. What is the advisable time period to conduct water tests upon taking water sample? S. 10 minutes T. 20 minutes U. **30 minutes** V. 40 minutes 26. Which publication should you consult before handling chemicals for treatment? W. Cargo plan X. **MSDS** Y. Engine logbook Z. Safety handbook 27. Which of the following inhibitors is recommended for cooling water? A. Oily inhibitors B. **Nitrate borate** C. Silicates D. Phosphate 28. It is important for every engineer to know the interval of replacement of engine cooling water system to be done every \_\_\_\_\_\_\_\_. E. 1 year F. **2 years** G. 3 years H. 4 years 29. Disposal of wasted water from cooling system should adhere to what governing laws? I. SOLAS Regulation J. STCW regulation K. **MARPOL regulation** L. ISM regulation 30. Which part of cooling system does dosing of chemicals take place? M. **Expansion tank** N. Jacket heater O. Feed water tank P. Sea water line