Assessment Test

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1. If a large number of tubes fail in a steaming boiler, the __________.


2. Which of the following repairs should be made to a badly warped boiler tube?


3. Waterside abrasion of boiler tubes can be caused by __________.


4. The development of pinhole leaks where the boiler tubes enter the water drums and headers, may be evidence of __________.


5. The generating tubes in an operating boiler will overheat and possibly fail when the boiler reaches the end point of __________.


6. Cratering and water tracking in boiler tubes is caused by __________.


7. If a tube failure results from low water level and the water level can not be maintained in sight in the gage glass, you should __________.


8. Oil or scale deposits on boiler tube walls will cause __________.


9. Fireside burning of boiler tubes is usually the direct result of __________.


10. Fireside burning of boiler super-heater tubes is a direct result of __________.


11. Fireside burning of boiler tubes can be a result of __________.


12. The formation of a pit in the surface of a boiler tube is most likely to occur when __________.


13. If a boiler tube bank baffle carries away, or burns through, there will be __________.


14. Pulsating boiler furnace fires can be caused by __________.


15. Panting or rumbling in a boiler furnace is usually caused by __________.


16. The gravity tank in a gravity lube oil system serves to __________.


17. As compared with a typical front fired boiler, which of the listed conditions represents an advantage of a top fired boiler?


18. On a ship equipped with a gravity type lube oil system, which of the conditions listed will occur first if the main lube oil pump discharge pressure is lost?


19. Which of the listed absorbing agents could be used in a boiler during a dry lay up period?


20. A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should __________.


21. Which of the following conditions is the engineer's first warning that the main lube oil pump has stopped?


22. When you are installing a new furnace floor in an oil fired boiler, the clearance between the firebricks should be large enough to __________.


23. Oil supply pressure to the main lube oil header of a gravity feed lube oil system is __________.


24. To assure a long service life for boiler refractory materials after installation, the most effective method is to __________.


25. Magnets located in lube oil strainers serve to __________.


26. Which of the listed procedures is the most important factor to take into consideration when making repairs to the refractory surrounding the burner openings?


27. A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage is __________.


28. In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the __________.


29. When drying and baking are impractical, or time is not available, which of the listed materials could be used to repair both burner openings and gas baffles?


30. When cleaning the waterside of boiler tubes with a powered rotary brush, the brush should kept in motion to __________.


31. Maximum heat transfer rates in a marine boiler can be obtained by __________.


32. Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________.


33. The correct method of expanding a generating tube at the boiler drum tube sheet is to roll __________.


34. If the main and standby lube oil service pumps of the main engine fail while underway at sea, __________.


35. If lube oil pressure to the main turbines is lost while underway at sea speed, the rotor should be stopped immediately. This is accomplished by __________.


36. What is the first thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed?


37. Which of the conditions listed could cause an oil flow sight glass of a main turbine bearing to be completely filled with oil?


38. Proper lagging of a single-element feed water regulator is accomplished by applying the insulation material __________.


39. Magnets are installed in the main propulsion turbine lube oil strainers to attract metal particles released through wearing of the __________.


40. When testing boiler safeties, those valves not being tested are prevented from lifting by __________.


41. If the main turbine bearing lube oil pressure drops to 'zero' and cannot be restored immediately, you should __________.


42. To prevent safety valves from lifting when a boiler is being hydrostatically tested, you should __________.


43. If you are underway at full speed on a vessel fitted with a main propulsion turbine pressure lubrication system, which of the following actions will be necessary upon complete loss of lube oil pressure?


44. Which of the precautions listed should be taken when gagging a boiler safety valve?


45. What immediate action should you take if you are on watch and note 'zero' lube oil pressure for the operating main turbine?


46. Safety valve gags should only be installed hand tight in order to prevent __________.


47. When using the universal color contrast-type dye penetrant to examine a boiler weldment, any surface defect will appear __________.


48. An excessive pressure differential across a lube oil strainer could indicate __________.


49. When installing new safety valve escape piping, precautions should include assuring that __________.


50. While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler?


51. Which of the listed operating practices is considered as safe, and should be followed when opening and inspecting the waterside of a boiler?


52. When a sudden increase in pressure occurs in a forced lubrication system, you should check for a ___________.


53. Which type of waterside deposits can normally be removed by chemically boiling out a boiler?


54. Which of the listed refractory materials should be used for patching a burner front formed of plastic, castable, or tile?


55. Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet?


56. To make temporary emergency repairs to brickwork in a boiler furnace, which of the materials listed should be used?


57. Tubes may be seal welded into fittings or headers of boilers and super heaters after they have been expanded and flared, provided the material in the fitting or header does not contain carbon in excess of __________.


58. Routine maintenance of boiler sliding feet should include __________.


59. To increase the blow down of a nozzle reaction safety valve, __________.


60. To assure the main propulsion turbine bearings are receiving the proper lube oil supply, you should check the __________.


61. The astern guarding valve on main propulsion steam turbine units must be open when a vessel is __________.


62. Increasing the blow down of a boiler nozzle reaction safety valve is normally accomplished by __________.


63. While a vessel is underway, one of the first indications of the failure of the gland leak-off exhaust fan motor is __________.


64. When installed, the economizer relief valve should always be set __________.


65. Warping of super-heater screen tubes can be caused by __________.


66. When you are installing a new furnace floor in an oil fired boiler, the clearance between each firebrick should be enough to __________.


67. When you are installing a new furnace floor in an oil fired boiler, enough clearance should be left between firebrick to allow for __________.


68. The burner front refractory should be replaced when the slag accumulation causes __________.


69. When water washing the firesides of a boiler, which of the listed procedures should be followed?


70. Which of the tools listed is used to remove a boiler tube from a header?


71. Which of the statements represents an advantage of the 'bent tube' method of installing boiler tubes?


72. Which procedure should be followed to dry out the fireside of a boiler after water washing?


73. How is an excess of turbine gland seal steam remedied?


74. Improper water washing of the water-tube boiler firesides can cause __________.


75. In the absence of the manufacturer's instructions, a good procedure in reassembling a high pressure boiler gage glass is to tighten the nuts in pairs and __________.


76. Which of the following actions, if any, should be taken if the water gage glass on a steaming boiler breaks?


77. If a water-tube boiler tube has sagged and must be plugged, a hole must be made in the tube wall to prevent __________.


78. After a boiler generating tube has been plugged, __________.


79. The purpose of a thrust bearing, mounted between the engine and the propeller of a steam plant power train, is to __________.


80. An obstruction in the top connection of a boiler gage glass will cause the __________.


81. While the vessel is rolling in heavy seas, the level in the boiler gage glass remains steady, this is an indication that __________.


82. Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall?


83. Radial cracks have developed in the castable refractory of the burner cones after the first firing since the installation of new furnace front refractory. This is an indication of __________.


84. Coast Guard Regulations (46 CFR) require that in preparing a water-tube boiler for a hydrostatic test, you should fill the boiler with water at a temperature of not less than __________.


85. Waterside grooving is usually very difficult to locate in a boiler tube before leakage occurs because __________.


86. Which of the conditions listed could cause a boiler economizer to leak?


87. When a soot fire occurs, damage to an economizer can be minimized if you __________.


88. Which of the conditions listed would indicate excessive soot buildup on the economizer?


89. Which of the problems listed will occur when the economizer temperature is below the acid dew point of the flue gases?


90. Which of the following would indicate a moderate leak in the de-super heater?


91. A leak in a de-super heater could be indicated by a/an __________.


92. A small leak in the de-super heater of an operating boiler could cause an __________.


93. A leak in the internal de-super heater located in one of the two main boilers on a ship can be indicated by a/an __________.


94. Leakage into an internal de-super heater may be caused by __________.


95. Which of the conditions listed could be the cause of chattering in a boiler safety valve?


96. While your vessel is underway at normal speed, a steam drum safety valve develops a significant leak. Your first corrective action should be to __________.


97. The most common cause of heat blisters developing on boiler generating tubes is due to __________.


98. Blisters developing on boiler tubes can be caused by __________.


99. Heat blisters forming on the first row of the generating tubes are caused by __________.


100. If a large number of tubes has failed, you can minimize damage to a boiler by __________.


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