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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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Questions 701–800 of 1,029 · page 8 of 11

  1. #701 The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these ri...
  2. #702 On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________.
  3. #703 Main steam turbine bearings are lined with __________.
  4. #704 For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________.
  5. #705 An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________.
  6. #706 Turbine casing flanges are sometimes provided with a system of joint grooving to __________.
  7. #707 Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of __________.
  8. #708 Which of the devices listed is found on an LP main propulsion steam turbine casing?
  9. #709 The purpose of the sentinel valve installed on a turbine casing is to __________.
  10. #710 Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 illustration
  11. #711 The astern element of a main propulsion turbine is usually designed as a/an __________.
  12. #712 Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________.
  13. #713 When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________.
  14. #714 The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________.
  15. #715 Labyrinth packing rings are installed on turbine diaphragms to minimize __________.
  16. #716 Where are moisture shields located in a main propulsion steam turbine?
  17. #717 The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the _______.
  18. #718 The jacking gear on main propulsion turbines can be used to __________.
  19. #719 The main propulsion shaft turning gear usually connects to the free end of the high- speed high pressure pinion because the __________.
  20. #720 Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion?
  21. #721 Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________.
  22. #722 Prior to rolling the main turbines in preparation for getting underway, you should __________.
  23. #723 After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the ________.
  24. #724 When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________.
  25. #725 With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern...
  26. #726 To stop the rotor of a main turbine while underway at sea you should __________.
  27. #727 To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged?
  28. #728 A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________.
  29. #729 If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?
  30. #730 Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________.
  31. #731 Raising vacuum on a main turbine unit without using the turning gear will result in __________.
  32. #732 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...
  33. #733 If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should __________.
  34. #734 The main propulsion turbine can be damaged by __________.
  35. #735 An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.
  36. #736 An overheated bearing in the main propulsion unit is indicated by __________.
  37. #737 When a turbine bearing shows signs of overheating, you should __________.
  38. #738 The turbine of a turbo-electric drive should be secured by __________.
  39. #739 An auxiliary turbine boiler feed pump should normally be stopped by __________.
  40. #740 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________.
  41. #741 Most auxiliary turbine feed pumps do not require an external source of gland sealing steam because they __________.
  42. #742 Packing rings installed on auxiliary turbines are generally lubricated by __________.
  43. #743 Which of the following statements describes how the main propulsion turbine over speed relay initiates closing of the throttle valve?
  44. #744 When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________.
  45. #745 A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance?
  46. #746 A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________.
  47. #747 Which of the listed parts illustrated in the turbo generator governing system, provides the follow-up to prevent the nozzle valves from cycling betwee... illustration
  48. #748 Which of the listed actions will occur when there is an increase in load on a ship service generator equipped with a centrifugal type hydraulic govern... illustration
  49. #749 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________.
  50. #750 An excess pressure governor would normally be used on a __________.
  51. #751 The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities?
  52. #752 A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?
  53. #753 Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turb...
  54. #754 Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator?
  55. #755 A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the... illustration
  56. #756 One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to __________.
  57. #757 The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the __________.
  58. #758 In a disk type centrifugal purifier, the contaminated oil enters the centrifuge __________.
  59. #759 Clean oil leaves the centrifuge illustrated through item __________. Illustration GS-0124 illustration
  60. #760 Water removed through centrifugal force in the illustrated unit is displaced from the bowl through __________. Illustration GS-0124 illustration
  61. #761 The three wing device in the unit illustrated is maintained in its position by item __________. Illustration GS-0124 illustration
  62. #762 Oil supply pressure to the main lube oil header of a gravity feed lube oil system is __________.
  63. #763 Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011 illustration
  64. #764 Which of the following statements about gravity type lube oil systems is correct?
  65. #765 After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by __________.
  66. #766 In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________.
  67. #767 62. The maximum lube oil temperature leaving the lube oil cooler of a main steam turbine propulsion system should __________.
  68. #768 63. The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.
  69. #769 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...
  70. #770 When an oil purification centrifuge loses a portion of its seal, the oil can then be discharged through the heavy phase discharge port. This is partly...
  71. #771 In the illustrated device, what would be a reason for oil being discharged from port "N" ? Illustration GS-0124 illustration
  72. #772 Which of the following problems will occur if a manually cleaned disk-type centrifugal lube oil purifier contains insufficient sealing water prior to...
  73. #773 If a lube oil pump fails to build up discharge pressure, the cause could be the __________.
  74. #774 If a tube should leak in an operating main steam turbine lube oil cooler, the water will not immediately contaminate the oil because the __________.
  75. #775 While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler?
  76. #776 While making your rounds, you notice the main lube oil temperature to be higher than normal. To remedy this situation, you should __________.
  77. #777 No lube oil appearing in the sight glass (bull's eye) of a gravity type system is a positive indication of __________.
  78. #778 Which of the conditions listed could cause an oil flow sight glass, of a main turbine bearing, to be completely filled with oil?
  79. #779 When a sudden increase in pressure occurs in a forced lubrication system, you should check for a __________.
  80. #780 To determine the extent of lube oil system contamination you would __________.
  81. #781 Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________.
  82. #782 A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________.
  83. #783 Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation?
  84. #784 Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet?
  85. #785 Which of the following types of bearings are used as line shaft bearings?
  86. #786 Babbitt is a metal alloy commonly used for lining __________.
  87. #787 The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________.
  88. #788 Most main propulsion reduction gear bearings are __________.
  89. #789 Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the...
  90. #790 Which of the following statements is true concerning the coupling shown in the illustration? Illustration SE-0001 illustration
  91. #791 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
  92. #792 The purpose of the main reduction gears is to __________.
  93. #793 What is the significance of pinion deflection in the operation of reduction gears?
  94. #794 The component labeled "II", as shown in the illustration, is called the __________. Illustration SE-0013 illustration
  95. #795 The reduction gear shown in the illustration is a/an __________. Illustration SE-0013 illustration
  96. #796 Regarding main reduction gears, when high speed first reduction pinions and gears are connected to low speed pinions and gears, each contained in a se...
  97. #797 As found in a reduction gear drive system, thrust bearings serve to __________.
  98. #798 In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by __________. Illustration SE-0007 illustration
  99. #799 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
  100. #800 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...

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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