Assessment Test

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1. Which of the devices listed are used to rigidly mount reduction gear bearings in their housings?


2. The most likely result of water slugging in the steam supply to a ship service turbo generator is __________.


3. Which of the conditions listed occurs when glassy slag, formed by the burning of fuel oil contaminated with salt water, melts and runs over the furnace wall?


4. To properly sound a reserve feed water tank, you should use a/an __________.


5. Using a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank will __________.


6. Which possible condition has occurred if a vacuum is present at the atmospheric drain tank vent while the vessel is underway?


7. The level of the drain inspection tank continually decreases after steam is admitted to a double bottom tank fuel oil heating coil. You can expect __________.


8. Which of the following statements describes the function of a ship's propulsion plant main reduction gear thrust bearing?


9. Turbine lube oil suction strainer baskets have __________.


10. Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing?


11. Which of the bearings listed is used in some turbines to limit axial movement?


12. The Kingsbury bearing is equipped with pivoted shoes in order to __________.


13. Which of the features listed, regarding the Kingsbury thrust bearing, prevents the base ring from turning and secures it to its housing?


14. In a reduction gear train, a quill shaft of high torsional flexibility provides __________.


15. When water washing a boiler, the proper sequence for washing the sections should be the _________.


16. If an operating propulsion unit requires excessive quantities of gland sealing steam, you should suspect a __________.


17. To stop the rotor of a main turbine while underway at sea you should __________.


18. Circulation in a water-tube boiler is caused by the difference in the __________.


19. To prevent a small plastic refractory wall patch repair from falling into the furnace of a D-type boiler, you should __________.


20. After patching refractory with plastic firebrick, holes are poked in the patch on 1-1/2 inch centers in order to __________.


21. The terms 'swell' and 'shrink' relate to a change in boiler water level which __________.


22. Which of the listed actions should be carried out with the super heater vent valve during the time steam is being raised in a boiler?


23. An indication of excessive soot accumulation on boiler water tubes and economizer surfaces is -_________.


24. Boiler firesides must be kept free of soot accumulations because __________.


25. Excessive soot accumulations on boiler generating tube surfaces can result in __________.


26. The steam drum in a D-type marine boiler mainly __________.


27. Which of the flexible coupling types listed is used in most turbine reduction gear installations?


28. When two or more boilers provide steam flow to a common main steam line, each boiler main steam line shall be fitted with a main steam stop valve and a/an __________.


29. Which of the following factors determines the type of construction used for gear hubs in shipboard reduction gear units?


30. Which of the conditions listed could cause steam formation in the economizer?


31. The internal force in a material in which tends to resist deformation when subjected to external forces is known as:


32. Rate of fuel oil expansion varies directly when heated with the specific.


33. Fuels have energy stored to do work as in pushing the piston during the piston during combustion. What do we call this potential energy?


34. Which bearing half will receive the greatest load in a two stroke cycle engine?


35. It is the property of resistance to fracture under tensile or


36. When a body is acted on by a load which in its length is called _____.


37. When a cube of material is immersed in a liquid and subjected hydrostatic pressure, the cube will suffer a loss in volume as the hydrostatic pressure increases. This is called ____.


38. The perforated elevated bottom of the chain locker which prevents the chains from touching the main locker bottom and allows seepage of water to flow to the drains is called a______ .


39. What are normally the important motion of a vessel while sailing?


40. What is the ratio of shear and the resulting strain?


41. What is the approximate composition of air by mass?


42. In chemical notation a prefix is used to indicate the number of ____.


43. In war ship members support of decks are called:


44. For good performance while a lubricating oil is in the precipitation number should ____.


45. The movement of steam piping, as a result of changes in temperature, is compensated by the use of:


46. The effect of the cross-sectional shape of a beam on the beam


47. Sliding contact bearings are classified into two general categories journal bearing and:


48. The moment of any point in a ship


49. A crude petroleum classification in which residue contains more than 5% paraffin wax:


50. A tonnage tax is levied according to the _____.


51. What is the chemical symbol for fuel butane?


52. What consist of two equal forces acting in oppose along separate parallel lines of action?


53. What is a measure of the rate of motion or speed of a body at any instant?


54. What is a measure of the tendency of a force acting in oppose along separate parallel lines of action?


55. What comes about from some static form of loading and the value of the stress does not change?


56. The valve opening sequence for bar-lift nozzle control valves in a marine steam turbine is determined by __________.


57. The proper way to quickly reduce high water level in a steaming boiler is to use the __________.


58. Upon assuming the watch on a steam ship while cargo operations are in progress with the main engine and reduction gear secured, you notice a very large increase in the reduction gear lube oil sump level from previous log book entries. What would be the most probable cause of this large increase in sump level?


59. If the rated distillate production of a submerged tube type evaporator cannot be maintained with the supplied maximum steam pressure, the evaporator __________.


60. Moisture erosion in the last stages of the low pressure turbine will result from __________.


61. Water carryover in the steam entering a turbine could result in __________.


62. An auxiliary turbine boiler feed pump should normally be stopped by __________.


63. One method of securing shroud bands to the ends of the turbine blades is to __________.


64. The general method of fastening shroud bands to turbine blades would be to use __________.


65. The general method of reducing turbine reaction blade vibration is by the use of __________.


66. What is generally found at the end of the low pressure turbine rotor of a cross-compound turbine arrangement?


67. Why do double flow reaction turbines produce very little axial thrust?


68. Which of the following lube oil system lines generally includes an illuminated sight glass (bull's-eye)?


69. If a spring bearing begins to run at an abnormally high temperature, you should __________.


70. The automatic re-circulating valve in the main condensate re-circulating line is controlled by a temperature sensor which is located at the __________.


71. Automatic fuel shutoff to the burners of a main propulsion boiler could result from __________.


72. A gravity type lube oil system for a steam vessel will have a remote pressure sensing device installed on the main lube oil header of the main turbine unit to enable the watch engineer to __________. I. determine if there is a normal level of lube oil in the gravity tank. II. be certain that the bearings are being adequately lubricated


73. What type of strainer is used in a turbine lube oil system to remove metallic particles?


74. A turbo-generator governing system maintains constant turbine speed by using a flyweight-actuated pilot valve to control hydraulic oil flow to a lifting beam operating cylinder, which in turn, __________.


75. While standing watch underway at sea, you notice salinity carryover in the low pressure distilling plant. This can be a result of __________.


76. The most serious fireside burning of the boiler super heater tubes can be indirectly attributed to __________.


77. High pressure and low pressure drain systems are part of the __________.


78. Which of the operating principles listed would apply to a single-element, thermo-hydraulic, feed water regulator?


79. The function of a quill shaft used on a double reduction gear main propulsion unit is to __________.


80. The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________.


81. According to 46 CFR Part 56, which of the following statements is true concerning the main steam stop valves on multiple boiler installations incorporating uncontrolled super-heaters?


82. To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged?


83. Water circulates within a natural circulation boiler as a result of the __________.


84. Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion?


85. Main steam turbine lubricating oil systems are fitted with __________.


86. Water circulates in a natural circulation boiler due to the __________.


87. In which type of turbine does the steam pass through reversing chambers machined on the inner surface of the casing, causing the steam to be redirected back to the turbine wheel rim?


88. The proportion of down-comers installed in relation to riser tubes in a vertical tube type of boiler, is dependent upon the __________.


89. A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over-speed setting for this unit must not exceed __________.


90. Which of the following precautions should be taken prior to lighting off a boiler?


91. Constant speed governors are normally employed with __________.


92. The steady frequency required from a ship service generator for electrical power is maintained by means of a __________.


93. On main turbine propulsion units, gear type flexible couplings are generally used between the __________.


94. The primary purpose of screen tubes installed in a marine boiler is to __________.


95. Which of the following problems can occur when an excessive number of water screen tubes are plugged?


96. The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________.


97. Which of the listed components is used to protect the boiler super heater against the radiant heat of the furnace?


98. In a modern main propulsion turbine installations, lube oil system strainers are usually located in the __________.


99. In steam turbine main engine installations, how are the main reduction gear bearings identical to other radial bearings?


100. Which of the following types of bearings are used as line shaft bearings?


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