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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 401–500 of 1,029 · page 5 of 11

  1. #401 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 w...
  2. #402 If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then __________.
  3. #403 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 sp...
  4. #404 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 circumst...
  5. #405 Precautions to be observed prior to starting a turbine driven cargo pump, should include __________.
  6. #406 The boiler wrapper sheet, shown in the illustration, is indicated by arrow __________. Illustration SG-0007 illustration
  7. #407 In what section of a boiler would you find a steam quality of 90%?
  8. #408 Steam baffles are used in the steam drum of a water-tube boiler to __________.
  9. #409 The internal feed pipe in a D-type marine boiler __________.
  10. #410 Which of the following statements represents the purpose of boiler sliding feet?
  11. #411 Which area shown in the illustration will offer the most resistance to heat transfer from the fireside to the waterside of a boiler tube? SG-0017 illustration
  12. #412 Under what operating conditions may water wall header drains be used for blow down?
  13. #413 In the boiler shown in the illustration, the arrow "E" indicates a __________. SG-0008 illustration
  14. #414 One advantage of installing water wall tubes in a boiler furnace is to __________.
  15. #415 In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter tha...
  16. #416 The boiler superheater shown in the illustration is a/an __________. SG-0007 illustration
  17. #417 Where is the superheater located in the boiler shown in the illustration? SG-0008 illustration
  18. #418 The purpose of the division plates installed in boiler superheater headers is to __________.
  19. #419 Which of the devices listed is shown in the boiler illustration? SG-0008 illustration
  20. #420 The items labeled "D" and "M" as indicated on the illustration are commonly called ________. SG-0020 illustration
  21. #421 The device shown in the illustration is a/an __________. SG-0013 illustration
  22. #422 Desuperheated steam can be found at the __________.
  23. #423 Which of the following locations could desuperheated steam be considered to occur?
  24. #424 The primary purpose of a control desuperheater installed in the steam drum of a boiler is to __________.
  25. #425 Which of the devices listed is indicated by arrow "H" shown in the illustration? SG-0008 illustration
  26. #426 The minimum feed water inlet temperature to a boiler economizer is determined by the __________.
  27. #427 Boiler fuel savings gained by the use of an economizer can amount to __________.
  28. #428 Which of the conditions listed could cause steam formation in the economizer?
  29. #429 The boiler economizer provides additional heat to the __________.
  30. #430 A check valve is located between the economizer and the steam drum to __________.
  31. #431 One factor for determining the minimum feed water inlet temperature to a boiler economizer is the __________.
  32. #432 Which of the listed refractory materials can be used in an area directly exposed to the highest heat in the furnace?
  33. #433 In a regenerative air heater, air is bypassed around the heater while __________.
  34. #434 When heated, brickwork in a boiler is kept from buckling by the installation of __________.
  35. #435 Which of the listed refractory materials is composed of wool fibers and clay binders?
  36. #436 According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating block"? Illustration SG-0003 illustration
  37. #437 Boiler refractory firebrick is secured to the casing by __________.
  38. #438 Boiler refractory previously baked out and fired is most sensitive to __________.
  39. #439 Which of the listed types of safety valves is shown in the illustration? Illustration SG-0018 illustration
  40. #440 On a boiler safety valve, the blow down adjusting ring is locked in place by a __________.
  41. #441 What is the primary operational difference between a nozzle reaction safety valve and a huddling chamber safety valve?
  42. #442 When excessive static boiler pressure has resulted in the initial lift of the valve disc, a huddling chamber safety valve will continue to lift open a...
  43. #443 Scavenging air lines are connected to boiler stack periscopes to __________.
  44. #444 Which type of waterside deposits can normally be removed by chemically boiling out a boiler?
  45. #445 Steam line water hammer can be best prevented by __________.
  46. #446 A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should __________.
  47. #447 Which of the methods listed would be most effective in repairing a steam cut on a seating surface of a superheater handhole plate?
  48. #448 Which of the tools listed is used to remove a boiler tube from a header?
  49. #449 When you are installing a new furnace floor in an oil fired boiler, the clearance between the firebricks should be large enough to __________.
  50. #450 Which of the listed procedures is the most important factor to take into consideration when making repairs to the refractory surrounding the burner op...
  51. #451 A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is __________.
  52. #452 Which of the listed refractory materials should be used for patching a burner front formed of plastic, castable, or tile?
  53. #453 After patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to __________.
  54. #454 To assure a long service life for boiler refractory materials after installation, the most effective method is to __________.
  55. #455 When installed, the economizer relief valve should always be set __________.
  56. #456 When water washing a boiler, the proper sequence for washing the sections should be the __________.
  57. #457 Which of the listed mediums should be used when water washing a boiler?
  58. #458 According to the data given in the illustration, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg,... illustration
  59. #459 If the saturation pressure of water is increased, the relative values shown on the illustrated graph of SG-0001 will change. According to pertinent in... illustration
  60. #460 Which of the following statements is true concerning the information tabulated in the table? Illustration SG-0004 illustration
  61. #461 According to the data given in illustration, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and... illustration
  62. #462 If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F?... illustration
  63. #463 What physical changes will occur to the steam within a boiler that has been properly bottled up when additional heat is applied?
  64. #464 The major heat loss in an oil fired boiler is the heat __________.
  65. #465 A lower than normal boiler stack gas temperature usually indicates __________.
  66. #466 A high carbon monoxide content in the flue gases of a boiler indicates __________.
  67. #467 When the rate of heat transfer through tube walls is so reduced that the metal becomes overheated, which of the following conditions will result in th...
  68. #468 Cratering and water tracking in boiler tubes is caused by __________.
  69. #469 The formation of a pit in the surface of a boiler tube is most likely to occur when __________.
  70. #470 In a water-tube boiler, waterside scale formation is caused by __________.
  71. #471 Blisters developing on boiler tubes can be caused by __________.
  72. #472 Waterside abrasion of boiler tubes can be caused by __________.
  73. #473 Fireside burning of boiler tubes is usually the direct result of __________.
  74. #474 Boiler tube failures can result from __________.
  75. #475 Warping of superheater screen tubes can be caused by __________.
  76. #476 An excessively high superheater temperature could be the result of __________.
  77. #477 When operating under constant load, the superheated steam temperature may rise above normal if the __________.
  78. #478 Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a __________.
  79. #479 Insufficient combustion air supply to the furnace would cause __________.
  80. #480 Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because __________.
  81. #481 Which of the following would indicate a moderate leak in the desuperheater?
  82. #482 Which of the conditions listed could cause a boiler economizer to leak?
  83. #483 Which of the conditions listed would indicate excessive soot buildup on the economizer?
  84. #484 Slag buildup on boiler furnace refractory is undesirable because it causes __________.
  85. #485 Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall?
  86. #486 Which of the following problems can occur when an excessive number of water screen tubes are plugged?
  87. #487 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 furnac...
  88. #488 Excessive foaming in a steaming boiler can cause damage to the __________.
  89. #489 In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by __________.
  90. #490 Rapid fluctuation in the superheater temperature of a steady steaming boiler indicates __________.
  91. #491 Oil accumulation in boiler water would __________.
  92. #492 High boiler water level can cause carryover and __________.
  93. #493 Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________.
  94. #494 The gage glass on a coil-type auxiliary boiler is connected to the __________.
  95. #495 Bottom blow valves are installed on auxiliary water-tube boilers to __________.
  96. #496 The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________.
  97. #497 The purpose of try-cocks used on an auxiliary boiler is to __________.
  98. #498 The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________.
  99. #499 The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________.
  100. #500 Which of the following statements concerning fire-tube boilers is correct?

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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