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Engine · 1,029 questions

Steam Plants - USCG Exam Questions

Boilers, steam turbines, condensate and feed systems, and the operation and maintenance of steam propulsion plants.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Steam Plants questions

Questions 301–400 of 1,029 · page 4 of 11

  1. #301 Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turb...
  2. #302 Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator?
  3. #303 A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the... illustration
  4. #304 The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed __________.
  5. #305 When the temperature of the main turbine lubricating oil is lowered, an increase will occur in the __________.
  6. #306 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 follow...
  7. #307 In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge direc...
  8. #308 To assure the main propulsion turbine bearings are receiving the proper lube oil supply, you should check the __________.
  9. #309 The term 'separation' as used in oil purification refers to the removal of __________.
  10. #310 If contaminated lube oil were allowed to settle undisturbed in a tank, into which layers would the contaminants separate?
  11. #311 Lube oil cannot be efficiently filtered i f it¶s __________.
  12. #312 According to the illustration, what is the normal function of the component shown? Illustration SE-0010 illustration
  13. #313 A common method of preheating main turbine lube oil prior to rolling over the main unit would be to ________.
  14. #314 Which of the following types of bearing lubrication schemes can carry the highest unit loading?
  15. #315 As lube oil absorbs moisture its dielectric strength can be expected to __________.
  16. #316 Which of the following conditions is indicated by oil flowing through a lube oil gravity tank overflow sight glass?
  17. #317 The gravity tank in a gravity lube oil system serves to __________.
  18. #318 What type of lube oil cooler is shown in the illustration? GS-0122 illustration
  19. #319 During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the __________.
  20. #320 Which of the following statements is true concerning lube oil coolers?
  21. #321 If the main and standby lube oil service pumps of the main engine fail while underway at sea, __________.
  22. #322 In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge direc...
  23. #323 Magnets are installed in the main propulsion turbine lube oil strainers to attract metal particles released through wearing of the __________.
  24. #324 As the speed of an oil lubricated ball bearing increases, fluid friction, due to churning, generates heat. This condition may be avoided by __________...
  25. #325 Which of the filters listed will deplete the additives in lubricating oil?
  26. #326 Turbine lube oil suction strainer baskets have __________.
  27. #327 One limiting problem of lube oil filters restricting their use in large lube oil systems is __________.
  28. #328 Fine metallic particles, which may originate from wear or failure of the lube oil service pump internal parts, are prevented from contaminating the be...
  29. #329 Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operatin...
  30. #330 In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should __________.
  31. #331 In the operation of a lube oil clarifier, the position of the oil-water interface should be __________.
  32. #332 Which of the following statements concerning the operation of a lube oil purifier is correct?
  33. #333 A centrifuge will satisfactorily remove which of the listed substances from lube oil?
  34. #334 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...
  35. #335 In order to maintain the effectiveness of the lube oil centrifuge to remove water, the engineer in charge should __________.
  36. #336 When water is removed from lube oil passing through a centrifugal purifier, the water removed will __________.
  37. #337 One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________.
  38. #338 The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the __________.
  39. #339 The disk stack and tubular shaft used in a lube oil centrifugal purifier is forced to rotate at bowl speed by __________.
  40. #340 In a disk type centrifugal purifier, the contaminated oil enters the centrifuge __________.
  41. #341 In a disk-type lubricating oil purifier, __________.
  42. #342 Item "Q" in the illustration is used to __________. Illustration GS-0124 illustration
  43. #343 Clean oil leaves the centrifuge illustrated through item __________. Illustration GS-0124 illustration
  44. #344 The rotating speed of the tubular bowl centrifuge is more than twice that of the disk type. The reason for this is __________.
  45. #345 Water removed through centrifugal force in the illustrated unit is displaced from the bowl through __________. Illustration GS-0124 illustration
  46. #346 The three wing device in the unit illustrated is maintained in its position by item __________. Illustration GS-0124 illustration
  47. #347 Oil supply pressure to the main lube oil header of a gravity feed lube oil system is __________.
  48. #348 Oil flowing through the sight glass in the line between the lube oil gravity tank and main sump indicates the __________.
  49. #349 Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011 illustration
  50. #350 In a gravity lube oil system, a sight glass is installed in a line near the operating platform. This line connects the __________.
  51. #351 Which of the following statements about gravity type lube oil systems is correct?
  52. #352 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 i...
  53. #353 After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by __________.
  54. #354 In steam turbine and reduction gear units, lube oil coolers installed in the lube oil system are located between the __________.
  55. #355 In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________.
  56. #356 Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________.
  57. #357 If a lube oil pump fails to build up discharge pressure, the cause could be the __________.
  58. #358 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 usuall...
  59. #359 While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler?
  60. #360 Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet?
  61. #361 The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.
  62. #362 A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________.
  63. #363 Which of the following problems will occur if a manually cleaned disk-type centrifugal lube oil purifier contains insufficient sealing water prior to...
  64. #364 If saltwater leaks into and contaminates the main lubricating oil system, which of the following remedial actions should be taken?
  65. #365 Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation?
  66. #366 The slight wavy appearance of the tips of reduction gear teeth is a result of __________.
  67. #367 Which of the following types of bearings are used as line shaft bearings?
  68. #368 Which of the following methods is used to securely fasten the Babbitt lining of a reduction gear bearing to its shell?
  69. #369 Babbitt is a metal alloy commonly used for lining __________.
  70. #370 Which of the following construction methods would apply to the Babbitt lined, split- type, reduction gear bearings?
  71. #371 The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________.
  72. #372 Chamfers, located at the parting edges of horizontal split sleeve type bearings, are used to facilitate oil storage and distribution. They are machine...
  73. #373 Most main propulsion reduction gear bearings are __________.
  74. #374 Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the...
  75. #375 Axial movement in a gear-type flexible coupling is provided for by __________.
  76. #376 Which of the following statements is true concerning the coupling shown in the illustration? Illustration SE-0001 illustration
  77. #377 Which of the coupling types listed is shown in the illustration? Illustration SE-0001 illustration
  78. #378 The part shown in the illustration would be located between which of the following components of a modern geared turbine main propulsion unit? Illustr... illustration
  79. #379 On main turbine propulsion units, gear type flexible couplings are generally used between the __________.
  80. #380 The component shown in the illustration, labeled "I", is the __________. SE-0013 illustration
  81. #381 The purpose of the main reduction gears is to __________.
  82. #382 The component shown in the illustration, labeled "IV", is the __________. SE-0013 illustration
  83. #383 What is the significance of pinion deflection in the operation of reduction gears?
  84. #384 After the housing has been bolted down, the final check of reduction gear tooth contact is usually made by __________.
  85. #385 The component labeled "II", as shown in the illustration is called the __________. Illustration SE-0013 illustration
  86. #386 The component shown in the illustration, labeled "III", is the __________. Illustration SE-0013 illustration
  87. #387 The reduction gear shown in the illustration is a/an __________. Illustration SE-0013 illustration
  88. #388 Which of the following statements defines the term 'axial float' in reference to reduction gears?
  89. #389 A ship is equipped with the illustrated turbine gear set and a right hand turning propeller. When steam is admitted to the astern element, with sternw... illustration
  90. #390 As found in a reduction gear drive system, thrust bearings serve to __________.
  91. #391 In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by __________. Illustration SE-0007 illustration
  92. #392 In the diagrammatic arrangement of the thrust bearing, shown in the illustration, the direction of shaft rotation and the direction of thrust are indi... illustration
  93. #393 The base ring shown in the illustration is identified by the letter __________. Illustration SE-0012 illustration
  94. #394 A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings beca...
  95. #395 Which of the statements listed applies to the quill shaft shown in the illustration? Illustration SE-0005 illustration
  96. #396 Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing?
  97. #397 The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________.
  98. #398 Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears?
  99. #399 Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature?
  100. #400 The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________.

Steam Plants questions: what to expect

Q How many Steam Plants questions are in the Engine pool?

There are 1,029 Steam Plants questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Steam Plants module from the same pool.

Q What score do I need to pass the Steam Plants module?

Most USCG exam modules, including Steam Plants, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Steam Plants exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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