Assessment Test

Warning: mysql_connect(): Access denied for user 'lorque_wrdp1'@'localhost' (using password: YES) in /home/tmc2018/ on line 15

1. As found in a reduction gear drive system, thrust bearings serve to __________.


2. A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing __________.


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


4. The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________.


5. Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears?


6. Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature?


7. Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal?


8. If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then __________.


9. 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?


10. While a vessel is underway the low pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction?


11. Precautions to be observed prior to starting a turbine driven cargo pump, should include


12. A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?


13. Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism?


14. Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator?


15. The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed __________.


16. When the temperature of the main turbine lubricating oil is lowered, an increase will occur in the __________.


17. 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?


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


19. The term 'separation' as used in oil purification refers to the removal of __________.


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


21. Lube oil cannot be efficiently filtered if it’s __________.


22. A common method of preheating main turbine lube oil prior to rolling over the main unit would be to ________.


23. Which of the following types of bearing lubrication schemes can carry the highest unit loading?


24. As lube oil absorbs moisture its dielectric strength can be expected to __________.


25. Which of the following conditions is indicated by oil flowing through a lube oil gravity tank overflow sight glass?


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


27. What type of lube oil cooler is shown in the illustration? GS-0122


28. During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the __________.


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


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


31. 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 __________.


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


33. As the speed of an oil lubricated ball bearing increases, fluid friction, due to churning, generates heat. This condition may be avoided by __________.


34. Which of the filters listed will deplete the additives in lubricating oil?


35. Turbine lube oil suction strainer baskets have __________.


36. One limiting problem of lube oil filters restricting their use in large lube oil systems is __________.


37. Fine metallic particles, which may originate from wear or failure of the lube oil service pump internal parts, are prevented from contaminating the bearings served by the lube oil system by __________.


38. Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures?


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


40. In the operation of a lube oil clarifier, the position of the oil-water interface should be __________.


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


42. A centrifuge will satisfactorily remove which of the listed substances from lube oil?


43. 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 __________.


44. In order to maintain the effectiveness of the lube oil centrifuge to remove water, the engineer in charge should __________.


45. When water is removed from lube oil passing through a centrifugal purifier, the water removed will __________.


46. One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________.


47. The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the __________.


48. The disk stack and tubular shaft used in a lube oil centrifugal purifier is forced to rotate at bowl speed by __________.


49. In a disk type centrifugal purifier, the contaminated oil enters the centrifuge __________.


50. In a disk-type lubricating oil purifier, __________.


51. The rotating speed of the tubular bowl centrifuge is more than twice that of the disk type. The reason for this is __________.


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


53. Oil flowing through the sight glass in the line between the lube oil gravity tank and main sump indicates the __________.


54. In a gravity lube oil system, a sight glass is installed in a line near the operating platform. This line connects the __________.


55. Which of the following statements about gravity type lube oil systems is correct?


56. 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?


57. After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by __________.


58. In steam turbine and reduction gear units, lube oil coolers installed in the lube oil system are located between the __________.


59. In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________.


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


61. If a lube oil pump fails to build up discharge pressure, the cause could be the


62. 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?


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


64. Which of the following conditions may exist if you detect an excessive amount of metal


65. The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.


66. A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________.


67. Which of the following problems will occur if a manually cleaned disk-type centrifugal lube oil purifier contains insufficient sealing water prior to admitting oil flow to the bowl?


68. If saltwater leaks into and contaminates the main lubricating oil system, which of the following remedial actions should be taken?


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


70. The slight wavy appearance of the tips of reduction gear teeth is a result of __________.


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


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


73. Babbitt is a metal alloy commonly used for lining __________.


74. Which of the following construction methods would apply to the Babbitt lined, split- type, reduction gear bearings?


75. The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________.


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


77. Most main propulsion reduction gear bearings are __________.


78. Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the reduction gear?


79. Axial movement in a gear-type flexible coupling is provided for by __________.


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


81. The purpose of the main reduction gears is to __________.


82. What is the significance of pinion deflection in the operation of reduction gears?


83. After the housing has been bolted down, the final check of reduction gear tooth contact is usually made by __________.


84. Which of the following statements defines the term 'axial float' in reference to reduction gears?


Total Rating:

click here to go to review now