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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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All Engineering Safety questions

Questions 101–200 of 1,109 · page 2 of 12

  1. #140 Which of the listed methods is the most effective to fight a fire on the open deck of a vessel if using a dry chemical type fire extinguisher?
  2. #141 When fighting a fire with a portable dry chemical extinguisher you should always __________.
  3. #143 You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________.
  4. #148 To properly maintain fire hoses, you should __________.
  5. #150 There is always a lower water pressure at the fire hose outlet than is found at the discharge of the pump. Which of the following reasons is the commo...
  6. #151 Fire hoses located at protected fire stations must always be __________.
  7. #157 A low velocity fog applicator is held in an all-purpose nozzle by a bayonet joint. The applicator is prevented from rotating in the joint by _________...
  8. #159 An extinguishing agent which effectively cools dilutes combustible vapors and provides a heat and smoke screen is __________.
  9. #160 Low velocity water fog is used in firefighting as a __________.
  10. #162 When a ship's low-pressure CO2 fixed fire extinguishing system is activated from a remote location, what determines the quantity of CO2 that will be r...
  11. #164 After extinguishing a paint locker fire using the fixed CO2 system, the next immediate action is for the space to be __________.
  12. #165 When fighting a machinery space fire, you should operate a fixed CO2 system by opening the control valve to the space protected and __________.
  13. #167 Why is it essential to introduce CO2 from a fixed fire extinguishing system, into a large engine room, as quickly as possible?
  14. #169 The source of power for the CO2 discharge alarm siren is obtained from __________.
  15. #170 The primary function of an automatic sprinkler system is to __________.
  16. #172 While fighting a fire, in order to utilize two hoses from a single 'wye' gate attached to a hydrant outlet, you need only turn the valve handle ______...
  17. #175 One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is __________.
  18. #176 As a firefighting medium, CO2 can be dangerous under certain conditions as it can cause __________.
  19. #177 Which extinguishing agent is most likely to allow reflash as a result of not cooling the fuel below its ignition temperature?
  20. #179 Dry chemical extinguishing agents extinguish a fire by __________.
  21. #181 A large oil fire on the weather deck of a ship can be effectively fought using __________.
  22. #183 One of the limitations of foam as a fire extinguishing agent is that foam __________.
  23. #184 Aqueous Film Forming Foam (AFFF), commonly known as 'light water', is especially suitable for fighting __________.
  24. #186 It is necessary to cool the bulkheads and decks surrounding a compartment where there is a fire in order to __________.
  25. #189 All of the following are part of the fire triangle EXCEPT __________.
  26. #191 To prevent the spread of fire by convection you should __________.
  27. #192 The spreading of fire as a result of heat being carried through a vessel's ventilation system is an example of heat transfer by __________.
  28. #193 Radiation can cause a fire to spread by __________.
  29. #195 A burning mattress is considered as which of the following classes of fire?
  30. #196 A fire in a pile of canvas would be classified as a __________.
  31. #198 A fire involving trash and paper waste would be classified as a __________.
  32. #200 A fire that has developed in a pile of rubber gasket material would be classified as a __________.
  33. #205 Which of the listed classes of fire would most likely occur in the engine room of a vessel?
  34. #206 A class "B" fire develops on the weather deck amidships of moored tank vessel. The fire party should man the __________.
  35. #207 Which of the fire extinguishing agents listed can be used to effectively combat a class B fire?
  36. #208 Which of the listed burning materials would be described as a class "B" fire?
  37. #209 To fight a class "C" fire, you should use carbon dioxide or __________.
  38. #210 Which of the hazards listed is of a primary concern, other than fire damage, associated with a class C fire?
  39. #211 A fire, occurring in the windings, of an overloaded electrical motor, is considered a __________.
  40. #213 Class C fires may be combated using a __________.
  41. #214 A class "D" fire would involve the burning of __________.
  42. #215 "Dry Powder" fire extinguishers, which contain a mixture of graphite and sodium chloride as the extinguishing agent, are generally used to fight which...
  43. #216 A fire involving aluminum powder would be a class __________.
  44. #218 Fires are grouped into which of the listed categories?
  45. #220 A fire can be extinguished by removing __________.
  46. #221 Good housekeeping on a vessel prevents fires by __________.
  47. #222 The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as __________.
  48. #223 Hazardous conditions exist which may result in spontaneous combustion when __________.
  49. #224 To prevent oily rags from spontaneously igniting they should be __________.
  50. #225 A simple precaution to reduce the possibility of accidental fires in the paint locker is to __________.
  51. #226 Through which of the listed processes is sufficient heat produced to cause spontaneous ignition?
  52. #227 To detect the presence of explosive gases in any space, tank, or compartment, you should use a __________.
  53. #229 Which of the following statements is true regarding oxygen indicators?
  54. #230 An oxygen indicator will detect __________.
  55. #231 If you see an individual fall overboard, you should __________.
  56. #232 Which of the gases listed is the poisonous gas most likely to be found in a closed compartment involved in a fire?
  57. #233 A tank has been sealed and unventilated for a long period of time. Which of the following statements is true?
  58. #238 Span gas is used aboard liquefied natural gas carriers to __________.
  59. #239 An LNG carrier has an approved type of gas detecting system to detect methane leaks in the __________.
  60. #240 Which of the following hazards is associated with the handling of petroleum products?
  61. #241 Petroleum vapors are dangerous __________.
  62. #242 When checking the level of a volatile liquid in a tank on the weather deck of a tank vessel, you should position yourself __________.
  63. #243 Which of the following methods will reduce the possibility of producing an electrical spark?
  64. #244 The vapors given off by heated fuel oil are flammable, explosive, and __________.
  65. #245 Bunker "C" is classified as a grade __________.
  66. #246 A specific document which identifies a chemical, and lists its physical properties, health hazards, required controls, firefighting procedures, cleanu...
  67. #248 Which health hazard term is listed on a Material Safety Data Sheet (MSDS) to indicate that contact with the substance will freeze body tissue on conta...
  68. #249 A Crude Oil Wash (COW) system is considered as __________.
  69. #250 In order for you to operate your vessel's crude oil wash system, the cargo tanks to be washed must be __________.
  70. #251 Both crude oil washing and water washing use direct impingement to remove residue from tanks. Crude oil washing has an additional advantage, in utiliz...
  71. #253 How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
  72. #254 The primary function of a "flue gas type" inert gas system is to _________.
  73. #256 If a cargo tank has not been certified as gas free, __________.
  74. #257 A tank or compartment is "gas free" when there is an absence of dangerous concentrations of __________.
  75. #259 A fuel tank is considered to be gas free when the tank is __________.
  76. #260 What information can be obtained from a marine chemist's certificate on a tank barge?
  77. #261 "Portable" oil tank cleaning machines are usually provided with a water supply from the __________.
  78. #263 When using portable tank cleaning machines, the hoses may be disconnected when __________.
  79. #265 The most effective method of extinguishing a class "A" fire is by __________.
  80. #266 If deck cargo is carried, it should be stowed so that it __________.
  81. #267 In firefighting, the term 'protecting exposures' means __________.
  82. #268 During cargo operations, a deck fire has occurred due to a leaking cargo line. You should FIRST __________.
  83. #269 When fighting a shipboard fire, crew members securing doorways, hatches, and applying cooling water to adjacent decks and bulkheads, while monitoring...
  84. #270 When approaching a fire from windward, you should shield firefighters from the fire by using an applicator and __________.
  85. #271 Which of the following statements represents the correct action to take when three crew members discover a fire?
  86. #273 If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of __________.
  87. #274 When combating a major electrical fire at sea, the main consideration is __________.
  88. #275 The most important characteristic of a fire extinguishing agent to be used on electrical fires is for the agent to be __________.
  89. #276 Which extinguishing agent is the best for use on electrical fires?
  90. #277 If a fire occurs in an electric cable, in which the inner layers of insulation, or the insulation covered by armor is burning, you should __________.
  91. #279 In fighting a fire in a fuel tank, the FIRST action you should attempt is to __________.
  92. #281 The longer an oil fire is permitted to burn, the __________.
  93. #282 The best means of combating an oil fire on the surface of the water surrounding a vessel tied to the pier is to use __________.
  94. #284 When fighting a liquefied natural gas fire, you should __________.
  95. #285 One of the main concerns when fighting a galley fire is __________.
  96. #286 In the event of an exhaust duct fire, most dry chemical and carbon dioxide galley range fixed extinguishing systems are automatically activated throug...
  97. #287 The airborne concentrations of substances (such as hydrogen sulfide) under which nearly all workers may be repeatedly exposed without adverse effects...
  98. #288 If flammable vapors have penetrated a gas free space, which of the following actions would be the most hazardous to perform?
  99. #289 A tank has been sealed and unventilated for a long period of time. Which of the following statements is true?
  100. #290 Before entering any space that has been sealed, its oxygen level should be tested. What level of oxygen in the space is equal to fresh air?

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.