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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 201–300 of 1,029 · page 3 of 11

  1. #201 The type of turbine shown in the illustration is classified as a __________. Illustration SE-0003 illustration
  2. #202 A pressure-velocity compounded impulse turbine consists of __________.
  3. #203 How many Curtis stages are contained in the turbine shown in the illustration? Illustration SE-0003 illustration
  4. #204 Design characteristics of a velocity-compounded impulse turbine include the utilization of __________.
  5. #205 Nozzle diaphragms are installed in pressure-compounded impulse turbines to __________.
  6. #206 An impulse-reaction turbine is characterized by which of the following arrangements?
  7. #207 In what classification of steam turbines are the moving blades and the adjacent fixed rows of blades shaped to act as nozzles?
  8. #208 In which type of turbine does a pressure drop exist through the fixed blades and the moving blades?
  9. #209 An energy loss associated with a reaction turbine, but not an impulse turbine, is __________.
  10. #210 What is used to compensate for the increased possibility of blade vibration occurring with impulse turbine blading?
  11. #211 A pressure drop occurs across both the moving and fixed blades of a reaction turbine as a result of the __________.
  12. #212 Which of the parts listed for a reaction turbine serve the same function as the nozzles of an impulse turbine?
  13. #213 Why do double flow reaction turbines produce very little axial thrust?
  14. #214 What happens to the steam as it moves across the moving blades in a reaction turbine?
  15. #215 The general method of reducing turbine reaction blade vibration is by the use of _______.
  16. #216 Large temperature and pressure drops which occur in the first stage of a combination impulse and reaction turbine are caused by steam passing through...
  17. #217 Concerning the classification of steam turbines, a cross compound designed unit __________.
  18. #218 In a cross-compounded turbine propulsion plant, steam enters the __________.
  19. #219 Why is superheated steam used in the main propulsion turbines instead of saturated steam?
  20. #220 What is generally found at the end of the low pressure turbine rotor of a cross-compound turbine arrangement?
  21. #221 As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it __________.
  22. #222 When a turbine is in operation, a rotor position micrometer is used to determine any change in rotor __________.
  23. #223 A turbine assembly in which steam flows in series through a high pressure turbine and then on to a low pressure turbine, with both turbines driving a...
  24. #224 As steam first enters the main propulsion turbine, which of the following energy conversions takes place?
  25. #225 For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________.
  26. #226 Journal bearings used with modern turbine rotors are manufactured in two halves in order to __________.
  27. #227 Which of the journal bearings listed most easily accommodates the minor turbine shaft misalignment?
  28. #228 The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these ri...
  29. #229 The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine __________.
  30. #230 On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________.
  31. #231 Main steam turbine bearings are lined with __________.
  32. #232 For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________.
  33. #233 An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________.
  34. #234 Turbine casing flanges are sometimes provided with a system of joint grooving to __________.
  35. #235 Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of __________.
  36. #236 Which of the devices listed is found on an LP main propulsion steam turbine casing?
  37. #237 The purpose of the sentinel valve installed on a turbine casing is to __________.
  38. #238 The astern element of a main propulsion turbine is usually designed as a/an __________.
  39. #239 Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 illustration
  40. #240 Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________.
  41. #241 When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________.
  42. #242 The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________.
  43. #243 Labyrinth packing rings are installed on turbine diaphragms to minimize __________.
  44. #244 Where are moisture shields located in a main propulsion steam turbine?
  45. #245 The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the _______.
  46. #246 The jacking gear on main propulsion turbines can be used to __________.
  47. #247 The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the __________.
  48. #248 Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion?
  49. #249 The main propulsion turbine should be operated with the __________.
  50. #250 Operating a steam turbine propulsion unit at medium speed, in an area with extremely cold seawater and the main circulating pump providing full coolin...
  51. #251 During normal operation of a main propulsion turbine, the lube oil supply temperature to the bearings should be maintained at approximately __________...
  52. #252 Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________.
  53. #253 The most critical period of main turbine operation is during cold start-up, rather than hot shutdown because __________.
  54. #254 Prior to rolling the main turbines in preparation for getting underway, you should __________.
  55. #255 Which of the listed procedures should be followed when raising vacuum on the main propulsion plant prior to getting underway?
  56. #256 After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the ________.
  57. #257 When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________.
  58. #258 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...
  59. #259 To stop the rotor of a main turbine while underway at sea you should __________.
  60. #260 The jacking gear must be engaged as quickly as possible when securing the Main Turbines in order to __________.
  61. #261 To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged?
  62. #262 When securing a main propulsion turbine equipped with carbon packing glands, the vacuum should always be broken before securing the gland seal steam b...
  63. #263 In securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to __________.
  64. #264 The FIRST step in breaking vacuum on a main turbine unit should be to __________.
  65. #265 A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________.
  66. #266 Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________.
  67. #267 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...
  68. #268 The main propulsion turbine can be damaged by __________.
  69. #269 An overheated bearing in the main propulsion unit is indicated by __________.
  70. #270 Most auxiliary turbines do not require an external source of gland sealing steam because they __________.
  71. #271 Turbine throttling losses can best be described as a loss of energy occurring __________.
  72. #272 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________.
  73. #273 An excess pressure governor is a special type of control device which would normally be found on a __________.
  74. #274 Carbon ring packing segments are secured in a shaft gland assembly of a steam turbine by means of __________.
  75. #275 Packing rings installed on auxiliary turbines are generally lubricated by __________.
  76. #276 Which type of packing is primarily utilized to control steam leakage from the casing of a modern auxiliary turbine?
  77. #277 When fitting new carbon ring packing on a turbine rotor shaft, carefully filing the ends of the segments will ______.
  78. #278 To test an automatic low lube oil pressure trip on an idling turbo generator and at the same time prevent the chance of bearing damage, you should ___...
  79. #279 The turbine of a turbo-electric drive should be secured by __________.
  80. #280 An auxiliary turbine boiler feed pump should normally be stopped by __________.
  81. #281 A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed __________.
  82. #282 In any governor there is a small range of speed in which no corrective action occurs. This speed range is called the governor dead band and is caused...
  83. #283 Rotating flyweights, acting against a spring force, will provide a simple type of __________.
  84. #284 A constant speed hydraulic governor would more than likely be installed on a __________.
  85. #285 Which of the following statements describes how the main propulsion turbine over speed relay initiates closing of the throttle valve?
  86. #286 When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________.
  87. #287 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
  88. #288 If two turbo-generators with the same no-load speed settings are operating in parallel, the unit whose governor has the lesser speed droop will ______...
  89. #289 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
  90. #290 A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________.
  91. #291 A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance?
  92. #292 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________.
  93. #293 An excess pressure governor would normally be used on a __________.
  94. #294 The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities?
  95. #295 In addition to causing erosion of turbine blades, slugs of water in the steam supply to a turbine driven pump can result in __________.
  96. #296 A turbo generator back pressure trip can be actuated as a result of __________.
  97. #297 The main throttle valve on a main propulsion turbine admits steam directly into the __________.
  98. #298 In the illustration of a typical ship service turbo generator control system, the handle labeled "B" is used to _______________. Illustration SE-0009 illustration
  99. #299 Which of the following statements concerning the design of balanced throttle valves is correct?
  100. #300 A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?

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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