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Engine · 1,109 questions

Engineering Safety - USCG Exam Questions

Engine room safety: firefighting and fire prevention, confined space entry, pollution regulations, and safe work practices.

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 201–300 of 1,109 · page 3 of 12

  1. #291 The reading of a combustible gas indicator indicates the percentage of the __________.
  2. #292 Combustible gas indicators incorporate the use of a/an __________.
  3. #293 Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an __________.
  4. #294 An oxygen indicator will detect __________.
  5. #295 Which of the following statements is true regarding oxygen indicators?
  6. #296 For hydrogen sulfide detection, sensitized tapes indicate the presence of this gas by means of discoloration of an exposed spot on the tape. The shade...
  7. #297 When required to work in an area where explosive gases may accumulate, you should use tools which are __________.
  8. #298 If you see an individual fall overboard, you should __________.
  9. #299 The worst atmospheric condition for dispersion of hydrogen sulfide is __________.
  10. #300 The explosive range of methane is 5% to 15% by volume in air. This means a vapor/air mixture of __________.
  11. #301 Which of the following conditions is true concerning flammable liquid vapors with a concentration above the upper explosive limit?
  12. #302 The highest concentration of a harmful substance to which a person may be exposed without danger to health, is termed the __________.
  13. #303 By definition, an example of a flammable liquid is __________.
  14. #304 According to Coast Guard Regulations (46 CFR), a flammable liquid with a Reid vapor pressure of 8 1/2 psi or less, and a flash point of 80°F or below,...
  15. #305 Which of the petroleum products listed has a flash point below 150°F?
  16. #306 The vapors given off by heated fuel oil are flammable, explosive, and __________.
  17. #307 When preparing to pump flammable liquids with a centrifugal pump, you should __________.
  18. #308 Bunker "C" is classified as a grade __________.
  19. #309 Which of the following is classified as a grade "E" combustible liquid?
  20. #310 Which of the following hazards is associated with the handling of petroleum products?
  21. #311 The explosive range of petroleum vapors when mixed with air is __________.
  22. #312 When checking the level of a volatile liquid in a tank on the weather deck of a tank vessel, you should position yourself __________.
  23. #314 An LNG carrier has an approved type of gas detecting system to detect methane leaks in the __________.
  24. #315 Span gas is used aboard liquefied natural gas carriers to __________.
  25. #316 Individuals who have consumed alcohol within 24 hours of exposure to H2S can tolerate __________.
  26. #318 When pumping sour crude, which gas should be tested for prior to entering the cargo pump room to repair a leaking pump?
  27. #319 A high concentration of hydrogen sulfide gas is most likely to be found in which of the locations listed?
  28. #320 What information can be obtained from a marine chemist's certificate on a tank barge?
  29. #321 A tank or compartment is "gas free" when there is an absence of dangerous concentrations of __________.
  30. #322 A compartment is tested and found to contain 20.8% oxygen by volume, permissible concentrations of toxic materials, and concentrations of flammable ga...
  31. #323 If, in a compartment or space, the gas or oxygen content is not within permissible concentration, and dangerous gases are either present, or may be pr...
  32. #324 If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be __________.
  33. #325 While in a foreign port, burning and welding repairs are to be carried out on a section of heating coil located in a tank having last contained a grad...
  34. #326 A health hazard term listed on a Material Safety Data Sheet (MSDS) that indicates allergic-like reaction in some people after repeated exposure is ___...
  35. #327 If the chemical material is a mixture, what must the Material Safety Data Sheet (MSDS) identify?
  36. #328 A specific document which identifies a chemical, and lists its physical properties, health hazards, required controls, firefighting procedures, cleanu...
  37. #329 A liquid, as listed on a Material Safety Data Sheet (MSDS), having a flash point below 100°F (37.78°C) is called a/an __________.
  38. #330 The physical data term on a Material Safety Data Sheet (MSDS) that indicates if the vapor formed by a material is lighter or heavier than air is calle...
  39. #331 To prevent oil from escaping into the sea when ballasting through the cargo piping system, you should FIRST __________.
  40. #332 Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as __________.
  41. #333 After ballasting a fuel tank, which of the listed valves should you close FIRST?
  42. #334 In order to prevent the unnecessary release of hydrocarbons to atmosphere, when taking on departure ballast, one method used is to _________.
  43. #335 When discharging clean ballast, prior to entering the loading port, if the ballast is determined by the oil monitor to exceed 15 parts per million of...
  44. #336 Victual waste is __________.
  45. #337 When dumping garbage into the sea, other than special areas, __________.
  46. #338 The amount of garbage disposed must be entered into the records maintained by each ship and stated in __________.
  47. #340 According to 33 CFR's, an oceangoing ship of over 400 gross tons must be fitted with a standard discharge shore connection. What size bolt circle diam...
  48. #341 The most critical part of the bunkering operations, which can result in an oil spill, is when the __________.
  49. #342 When the scuppers are plugged and an oil spill occurs on deck, you should __________.
  50. #343 Which of the precautions listed should be observed when taking on diesel fuel?
  51. #344 Your vessel is taking on bunkers from a shore side facility. If oil begins flowing from one tank vent, which of the following actions should be taken...
  52. #345 When should you expect to find an insulating flange in a fueling hose?
  53. #347 As its temperature rises, the volume of fuel oil stored in a tank will __________.
  54. #348 To determine if all requirements of the Declaration of Inspection are met for oil transfer operations just prior to bunkering from a shore side facili...
  55. #349 Why is it important for double bottom fuel oil tanks not to be topped off when loading fuel at cold temperatures?
  56. #351 As a precaution against oil spills when topping off fuel tanks, you should __________.
  57. #352 Where will you find the procedures for the reporting of oil discharge into the water?
  58. #353 During oil transfer operations, who would be responsible to guarantee that the posted transfer procedures are being followed?
  59. #354 A method NOT usually allowed for cleaning up oil spills would be the use of __________.
  60. #355 In cleaning up an oil spill, the use of straw or reclaimed paper fibers would be an example of which type of oil removal?
  61. #356 Small oil spills on deck can be prevented from contaminating any waters by __________.
  62. #357 Coast Guard regulations require a shipboard oil pollution emergency plan to be reviewed __________.
  63. #358 Which of the following is a mandatory section of the shipboard oil pollution emergency plan?
  64. #359 When amendments are made to the shipboard oil pollution emergency plan, all revisions must be submitted to the Coast Guard __________.
  65. #360 Which of the following is NOT required to be provided as part of the appendixes of the Shipboard Oil Pollution Emergency Plan?
  66. #361 U.S. flag ships may obtain an Oil Record Book from the __________.
  67. #362 The Oil Record Book for all U.S. ships ________.
  68. #363 In the Oil Record Book, a comprehensive list of operational items are grouped into operational sections. Each section is codified by a/an __________.
  69. #364 The overall responsibility in maintaining the Oil Record Book is given to ________.
  70. #365 Each operation involving the transfer of oil or oily mixture that requires an entry in the OIL Record Book shall be fully recorded ________.
  71. #366 If an incorrect entry were made in the Oil Record Book, you should __________.
  72. #367 Which of the following operations aboard a tanker must be recorded in the Oil Record Book on a tank-to-tank basis according to Coast Guard Regulations...
  73. #368 A gurgling noise is heard from within a cargo tank when discharging cargo, this would indicate that the __________.
  74. #369 Pressure-vacuum relief valves, as used on tank vessels, are usually set to operate at two points, __________.
  75. #371 Which of the following pressures represents the normal pressure setting of a pressure-vacuum relief valve as normally found on tank vessels?
  76. #373 A Crude Oil Wash (COW) system is considered as __________.
  77. #374 In order for you to operate your vessel's crude oil wash system, the cargo tanks to be washed must be __________.
  78. #375 Both crude oil washing and water washing use direct impingement to remove residue from tanks. Crude oil washing has an additional advantage, in utiliz...
  79. #376 Bottom mounted crude oil washing machines are primarily used for _________.
  80. #377 When tanks have been washed with crude oil, and ballasted without being water rinsed, the ballast is referred to as _________.
  81. #378 Crude oil washing has which of the following disadvantages?
  82. #379 To avoid excessive electrostatic effect in the crude oil washing process, due to the presence of water in the crude oil washing fluid, the contents of...
  83. #380 When the inert gas system is temporarily unable to maintain a positive pressure, or an oxygen content less than 8%, cargo operations should _________.
  84. #382 The blowers of an inert gas generation system aboard a tanker, will be automatically secured if __________.
  85. #383 How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
  86. #384 Each inert gas system must be equipped with the following instruments: oxygen concentration indicator and recorder, pressure indicator and recorder, a...
  87. #386 Excessive recirculation of inert gas is _________.
  88. #387 When securing the operation of an inert gas system, the final step should be _________.
  89. #388 "Portable" oil tank cleaning machines are usually provided with a water supply from the __________.
  90. #389 An electrically "charged mist" will be found in a __________.
  91. #390 When using portable tank cleaning machines, the hoses may be disconnected when __________.
  92. #391 When water washing epoxy-coated cargo tanks, the temperature and pressure of the wash water should generally not exceed __________.
  93. #393 Reserve buoyancy is the __________.
  94. #394 In the absence of external forces, the center of gravity of a floating vessel is located directly above the __________.
  95. #395 Stability is determined principally by the relationship of the center of gravity and the __________.
  96. #396 Clogged limber holes can endanger a ship's stability by __________.
  97. #397 Static water pressure on the hull of a ship is greatest at the __________.
  98. #399 The weight of the liquid displaced by a vessel floating in sea water is equal to the __________.
  99. #405 The distance between the bottom of the hull and the waterline is called __________.
  100. #406 After transferring a weight forward on a vessel, the draft at the center of flotation will __________.

Engineering Safety questions: what to expect

Q How many Engineering Safety questions are in the Engine pool?

There are 1,109 Engineering Safety 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 Engineering Safety module from the same pool.

Q What score do I need to pass the Engineering Safety module?

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

Q Are these the real USCG Engineering Safety 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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About the Engine question pool

The Engine pool holds the current U.S. Coast Guard questions for engineering credentials, from QMED ratings through DDE and Assistant Engineer up to Chief. Answer any question to see the correct choice instantly.