Assessment Test

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1. When operating under constant load, the superheated steam temperature may rise above normal if the __________.


2. Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate __________.


3. The measured gap between the face of the burner atomizer tip nut and the diffuser plate, is determined by the setting of the __________.


4. Chemicals are added to boiler water by injecting them __________.


5. The size of the discharge ring used in a lube oil purifier is determined by the oil's __________.


6. Combustion gases can leak into the fire room through __________.


7. Coast Guard Regulations (46 CFR) prohibit which of the following pipe fittings from being installed in fuel oil service discharge piping?


8. Natural circulation in a marine boiler is a result of __________.


9. While vacuum is being raised on the main unit and the turbine warmed, condensate is re-circulated to the main condenser to __________.


10. Why should a boiler furnace be purged before the first burner is lit off?


11. The diffuser of a burner register assembly __________.


12. Which of the following precautions should be observed when adding treatment chemicals to the boiler compound tank?


13. When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________.


14. Which of the valves listed should be closed before lighting off a boiler?


15. The bulk of the solid material entering a centrifugal purifier with lube oil is __________.


16. Excess free oxygen in the boiler feed water can be the result of __________.


17. In a marine condenser designed with a reheating hot well, the hot well is reheated by __________.


18. Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by __________.


19. When used as a separator, a centrifugal purifier may lose its seal and cause __________.


20. In a water-tube boiler, sludge is most likely to collect in the __________.


21. Longitudinal expansion of a boiler water drum is allowed for at the boiler __________.


22. Slag buildup on boiler furnace refractory is undesirable because it causes __________.


23. A boiler is to be secured in port. After the burners have been secured, the forced draft fan and air registers should be secured __________.


24. The major reason dissolved gases are removed from boiler feed water is because they may cause __________.


25. Water-tube boiler screen tubes protect which of the listed components from high furnace temperatures?


26. Except one of the following, if the boiler uptake periscope appears completely dark, this could indicate __________.


27. Any abnormal condition or emergency occurring in the fire room must be immediately reported to the __________.


28. What boiler water chemistry is necessary to ensure the precipitation of hard scale forming calcium?


29. Prior to lighting a burner in a cold boiler, you should __________.


30. The jacking gear on main propulsion turbines can be used to __________.


31. Water is best removed from lubricating oil by__________.


32. Excessive water loss from the main feed system can be caused by __________.


33. With the steam control valve wide open during normal operation, the rate of steam flow from the auxiliary exhaust steam line to the DC heater is actually a function of __________.


34. To safely reduce a high water level in a steaming boiler, you should __________.


35. The primary difference between sludge and scale deposits in boiler tubes is __________.


36. If the gage glass water level remains constant in a steaming boiler while maneuvering, the most probable cause is a __________.


37. The jacking gear is used in preparation for starting a marine turbine and reduction gear unit to __________.


38. Severe priming in a boiler can cause damage to the __________.


39. In accordance with Coast Guard Regulations (46 CFR), the maximum allowable working pressure of a water-tube boiler must be stamped on the __________.


40. Which of the following represents one of the most important considerations in the design and location of the boiler internal feed pipe?


41. Zincs are installed in the main and auxiliary condenser water boxes to __________.


42. The possibility of a flareback in a boiler will be reduced if you __________.


43. Boiler stack gas temperature could be higher than normal if __________.


44. Which ring dam arrangement should be used for centrifugal purification?


45. Scale prevention in boiler water is accomplished by adding treatment chemicals to __________.


46. When a boiler has been secured and is being initially cooled, the water level showing in the steam drum gage glass should be __________.


47. If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?


48. In a boiler, water flows downward in tubes furthest from the fires and flows upward in tubes nearest the fires because __________.


49. Air trapped within the main condenser shell is detrimental because it will __________.


50. When an oil purification centrifuge loses a portion of its seal, the oil can then be discharged through the heavy phase discharge port. This is partly a result of greater __________.


51. In a steaming boiler, higher than normal stack gas temperature can be caused by __________.


52. After restoring the normal water level in a boiler following a high water casualty, you should __________.


53. The most effective way to eliminate sludge from the water drum of a boiler is to __________.


54. The water seal in a centrifuge, operating at normal speed, prevents the lube oil from discharging from the water outlet. Another function of the seal is to __________.


55. The axial position of a turbine rotor is normally adjusted by varying the thickness of the __________.


56. Which of the actions listed should be carried out immediately after securing the fires in one boiler of a two boiler ship?


57. If the fires to a steaming boiler have been accidentally extinguished, you should not relight any burner until __________.


58. During the operation of a lube oil centrifuge, a thin emulsion interface occurs between the lube oil and seal. The position of this interface is determined by the __________.


59. Which of the condensers listed is cooled by sea water?


60. Which of the following statements is true concerning lube oil coolers?


61. What is indicated by the code number 32Y20 stamped on a burner sprayer plate?


62. Phenolphthalein indicator is used in the boiler water test for __________.


63. Which of the listed refractory materials can be used as a substitute for insulating brick and insulating block in certain boiler walls construction?


64. Which of the following statements represents the function the nozzle assembly performs in an impulse turbine?


65. Boiler refractory anchor bolts are secured to the casing by __________.


66. Which of the listed conditions will always result in dissolved oxygen being carried over from the main condenser?


67. The loop seal connected to the main condenser returns the drains from the __________.


68. A desirable property of boiler fuel oil is __________.


69. Which of the following statements represents the advantage of castable insulation over either insulating brick or insulating block installations?


70. A sodium sulfite test is performed on a boiler water sample to determine if __________.


71. Which of the listed refractory materials is composed of wool fibers and clay binders?


72. Nozzle diaphragms are installed in pressure compounded impulse turbines to __________.


73. The primary purpose of insulating cement is __________.


74. Under emergency operating conditions, the proper valve positions for controlling feed water to the boiler should be the __________.


75. Which of the following refractory materials can provide a straight backing surface for insulation block where minor casing warp has occurred?


76. The presence of sulphur in fuel oil will most likely cause __________.


77. Which atomizing sprayer plate has the largest capacity?


78. Which of the listed refractory materials may be used with other machinery insulation arrangements outside of the boiler?


79. Brick bolts, tile bolts, and pennant anchors are attached to the inner casing by __________.


80. A pressure-velocity compounded impulse turbine consists of __________.


81. Which of the listed refractory materials can be used in an area directly exposed to the highest heat in the furnace?


82. Which of the following statements represents the primary function of hand-holes used on a boiler?


83. If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed __________.


84. In the condensate system, the automatic re-circulating valve can be actuated by the __________.


85. The primary source of steam to the auxiliary exhaust system is typically supplied directly from __________.


86. The most harmful slag forming compounds found in fuel oils are __________.


87. Normally a boiler water sample should be taken __________.


88. The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the __________.


89. A boiler feed stop-valve must be mounted__________.


90. When the flow of oil admitted to a disk-type centrifugal purifier is in excess of its designed capacity, which of the following conditions will usually occur?


91. The gland exhaust fan draws steam and non-condensable vapors from the gland exhaust condenser and discharges to the __________.


92. The water level in a steaming boiler has risen to within 2 inches of the top of the top gage glass. Your immediate action should be to __________.


93. Insufficient combustion air supply will cause an atomizer flame to appear as a __________.


94. The purpose of the diffuser in a boiler burner assembly is to __________.


95. Prior to relieving the watch you should first check the fire room status by verifying the boiler steam drum level and _________


96. A nozzle in an impulse turbine functions to __________.


97. Steam baffles are used in the steam drum of a water-tube boiler to __________.


98. Which of the following chemicals is used in an Orsat apparatus to absorb carbon dioxide?


99. Any feed water testing done on a routine basis would normally include testing for __________.


100. When raising vacuum on an auxiliary condenser, which of the following steps is necessary?


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