Assessment Test


1. Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation?


2. The first step in breaking vacuum on a main turbine unit should be to __________.


3. Which of the following is the best reason for opening the air cock when draining a water-tube boiler?


4. The peeling of boiler refractory associated with slagging, is caused by the __________.


5. The purpose of the cam-actuated steam valve used in a boiler soot blower system, is to __________.


6. A cause of high super-heater outlet temperature is __________.


7. Which color burner flame would indicate too much excess air?


8. The relief valve on the discharge side of the fuel oil service pump may discharge directly to the settler, or to the __________.


9. An increase in the concentration of total dissolved solids in boiler water can result from __________.


10. In order to raise vacuum on the main turbine unit, you should __________.


11. A nozzle reaction safety valve will lift at a pressure lower than required if the __________.


12. Under otherwise normal operating conditions, a drop in the steam temperature leaving an uncontrolled inter deck-type super-heater could be caused by a/an __________.


13. In a tubular-bowl type centrifugal lube oil purifier, any solids separated from the oil are __________.


14. In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level?


15. An incandescent white flame in a boiler firebox would indicate __________.


16. The re-circulating valve provided in a straight mechanical boiler fuel oil service system, should be opened when __________.


17. An adequate phosphate reserve should be maintained in boiler water to __________.


18. Main steam turbine bearings are lined with __________.


19. Raising vacuum on a main turbine unit without using the turning gear will result in __________.


20. Under normal operating conditions, a drop in the steam temperature at the outlet of an inter-deck super-heater could be caused by a decrease in __________.


21. Water boxes on condensers are vented to __________.


22. Steam assist fuel atomizers are converted to straight mechanical atomizers in order to __________.


23. Phosphates are used in the chemical treatment of boiler water to __________.


24. A lube oil sample taken from the main engine lube oil system has a dark yellow opaque color. This is the result of __________.


25. Prolonged astern operation of a turbine will cause __________.


26. The primary operational difference between a huddling chamber type safety valve and a nozzle reaction type safety valve is the __________.


27. Which of the following statements is correct regarding the selection of the proper size ring dam for a tubular type lube oil purifier?


28. A lube oil sample is taken from the main engine lube oil system and visually inspected. Which of the following would indicate water contamination?


29. When main condenser tubes are rolled into both tube sheets, the effects due to differential expansion rates are minimized by the use of __________.


30. Under normal firing rates, which of the conditions listed could result in a low super-heater outlet temperature?


31. If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately __________.


32. In a disk-type purifier which component is used to separate lube oil into thin layers and create shallow settling distances?


33. Boiler water hardness in modern high pressure boilers should be kept as close to ?zero? as possible by chemically treating with __________.


34. A sudden unexplainable drop has occurred in the outlet temperature of an uncontrolled inter-deck super-heater on a boiler carrying a higher than normal TDS (total dissolved solids) reading. Which of the actions listed is required?


35. The purpose of the sentinel valve installed on a turbine casing is to __________.


36. What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve?


37. In a disk type lube oil purifier, heavy impurities collect mostly __________.


38. The lube oil coolers installed in a gravity lubricating oil system are located between the __________.


39. The recommended vacuum should be maintained in the main condenser to __________.


40. Which of the fuel atomizers listed has the greatest firing range or turndown ratio?


41. In the prevention of moisture carryover from a marine boiler, one important consideration is to __________.


42. When excessive static boiler pressure has resulted in the initial lift of the valve disc, a huddling chamber safety valve will continue to lift open as a result of __________._,


43. While standing your engine room watch at sea, you notice the D.C. heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?


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


45. One of the basic rules applying to the operation of a single-pass main condenser, is that the __________.


46. While trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem?


47. A flue gas analysis is performed to determine the __________.


48. An advantage of steam atomization compared to mechanical atomization is __________.


49. If contaminated lube oil were allowed to settle undisturbed in a tank, into which layers would the contaminants separate?


50. The purpose of shroud bands secured to the tips of the turbine blades is to __________.


51. In a huddling chamber type safety valve, initial valve opening is caused by static pressure acting on the __________.


52. A higher than normal stack gas temperature could indicate __________.


53. The original bridge gage reading for a reduction gear bearing was measured as .008 inches. A year later, the bridge gage reading for the same bearing is .010 inches. This indicates __________.


54. The steam drum air cock is normally opened when cooling down a boiler to __________.


55. In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should __________.


56. Chamfers, located at the parting edges of horizontal split sleeve type bearings, are used to facilitate oil storage and distribution. They are machined __________.


57. After the steam leaves the low pressure turbine, it enters the __________.


58. To allow for water drum expansion and contraction, most main propulsion boilers are fitted with __________.


59. If the stack temperature is higher than normal, this could indicate __________.


60. In a marine boiler, maximum heat transfer rates can be obtained by __________.


61. The jacking gear must be engaged as quickly as possible when securing the main turbines in order to __________.


62. After a boiler has been taken off the line and is cooling, the air cock is opened to __________.


63. Which of the following conditions is true concerning the boiler water drum foundations?


64. The maximum lube oil temperature leaving the lube oil cooler of a main steam turbine propulsion system should __________.


65. Proper vacuum must be maintained in the main condenser to __________.


66. Which of the types of super-heaters listed has the flattest superheat temperature curve?


67. Chemicals are added to boiler water in order to __________.


68. Before lighting any burner in a cold boiler you should always __________.


69. The main propulsion turbine should be operated with the __________.


70. The internal feed pipe in a D-type marine boiler __________.


71. Burning fuel with entrained saltwater, will cause a glassy slag formation on furnace refractory. This slag will __________.


72. While underway, vacuum in the main condenser is primarily caused by the __________.


73. The dirty oil inlet on centrifugal lube oil purifiers is located at the __________.


74. Boiler stack gas temperatures will be higher than normal when __________.


75. What is the quickest way to shutoff the boiler fuel oil supply from inside the fire room?


76. Chemicals are added to boiler water to __________.


77. To avoid acid corrosion of the economizer tubes when blowing tubes __________.


78. Maintaining low pressure in a condensing turbine exhaust trunk __________.


79. The maximum, safe, upper limit temperature of lubricating oil discharged from the purifiers is __________.


80. Which of the following methods is used to securely fasten the Babbitt lining of a reduction gear bearing to its shell?


81. In a D type marine boiler, operating under constant load, which of the following conditions could cause the superheated steam temperature to rise above normal?


82. In which of the following types of condensers would you find the cooling water passing through tubes with the turbo generator exhaust steam directed around the outside of the tubes?


83. A poorly cleaned lube oil purifier bowl may result in __________.


84. Low stack gas temperatures due to light boiler loads should be avoided in order to reduce the __________.


85. You can secure the fuel supply to the boilers from outside the fire room by __________.


86. While raising steam on a cold boiler, the air cock is to be closed after __________.


87. A main condenser utilizing a scoop for the circulation of seawater must be constructed as a __________.


88. Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled super- heater could be caused by __________.


89. Low stack gas temperature should be avoided to reduce __________.


90. All fuel oil service pumps are equipped with a __________.


91. One of the purposes of chemically treating boiler water is to __________.


92. Why is it important to maintain good vacuum in a main turbine unit while operating astern?


93. Which of the following is not the purpose of the boiler drum air cock?


94. Which of the following statements concerning the operation of a lube oil purifier is correct?


95. In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct?


96. Excessive soot deposits on the heating surfaces of a boiler uncontrolled inter-deck super-heater would be indicated by __________.


97. Lube oil is preheated before centrifuging in order to __________.


98. Which of the following represents the proper color of the flame end farthest from the boiler burner during normal operations?


99. The relief valve on the discharge side of the fuel oil service pump may discharge directly to the suction side of the pump, or to the __________.


100. Except one on the following, what is the purpose of chemically treating boiler water?


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