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Deck · 3,245 questions

Safety - USCG Exam Questions

Firefighting, lifesaving appliances and survival craft, emergency procedures, first aid, and pollution prevention regulations.

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 Safety questions

Questions 601–700 of 3,245 · page 7 of 33

  1. #691 Fires in combustible metals, such as sodium or magnesium, are classified as class __________.
  2. #692 Fires are grouped into what categories?
  3. #693 You are testing a tank that contained gasoline by using a combustible gas indicator. Under testing, the tank sample caused the needle to move rapidly...
  4. #694 A combustible gas indicator meter is calibrated to read the percentage of __________.
  5. #695 Combustible gas indicators measure the presence of combustible gas as a percentage of the __________.
  6. #696 When using the combustible gas indicator, a special filter for filtering the incoming sample must be used if the atmosphere being tested contains vapo...
  7. #698 Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks?
  8. #699 What is the best instrument for establishing a safe working area before welding in a confined space?
  9. #700 An oxygen indicator can be used to determine if there is __________.
  10. #701 The oxygen indicator is an instrument that measures the __________.
  11. #702 What could result in an incorrect oxygen concentration reading on the oxygen indicator?
  12. #703 Which statement is TRUE concerning the oxygen indicator?
  13. #704 What can be used to measure the percentage of oxygen inside a chain locker?
  14. #705 Deficient oxygen content inside a chain locker can be detected with __________.
  15. #706 Ambient air, which you normally breathe, contains what percent of oxygen?
  16. #707 After each reading of an oxygen indicator, the instrument should be purged with __________.
  17. #708 When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument?
  18. #709 You are using an oxygen indicator. How long should you wait after the sample is drawn into the instrument before reading the meter?
  19. #710 If the meter needle of the oxygen indicator cannot be set to zero, what should be done?
  20. #711 What is used to test a tank for oxygen content?
  21. #712 Combustible gas indicators operate by drawing an air sample into the instrument __________.
  22. #713 Before entering the chain locker, you should __________.
  23. #714 What can cause a lack of oxygen in a chain locker?
  24. #715 Deficient oxygen content inside a chain locker can be detected with __________.
  25. #716 Which fire detection system is actuated by sensing a heat rise in a compartment?
  26. #717 Fire alarm system thermostats are actuated by __________.
  27. #718 Some spaces protected by fixed carbon dioxide systems are required to have audible alarms that begin sounding prior to the discharge of CO2. This time...
  28. #719 The CO2 flooding system is actuated by a sequence of steps which are __________.
  29. #720 The danger associated with using carbon dioxide in an enclosed space is __________.
  30. #721 There are two disadvantages to CO2 as a firefighting agent. One of these is the limited quantity available, and the other is __________.
  31. #722 Which danger exists to people when CO2 is discharged into a small enclosed space?
  32. #723 Which statement concerning carbon dioxide is FALSE?
  33. #724 While you are working in a space, the fixed CO2 system is accidentally activated. You should __________.
  34. #726 The safety discs on carbon dioxide cylinders are set to release at 2,700 psi. Under normal circumstances this pressure will be reached at a temperatur...
  35. #727 CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when __________.
  36. #728 Spaces protected by a fixed CO2 system must be equipped with an alarm which sounds __________.
  37. #729 A safety outlet is provided on the CO2 discharge piping to prevent __________.
  38. #730 Before using a fixed CO2 system to fight an engine room fire, you must __________.
  39. #731 The gross weight of a fully charged CO2 bottle in a fixed CO2 system is 220 lbs. When the bottle is empty it weighs 120 lbs. What is the minimum accep...
  40. #732 The gross weight of a fully charged CO2 cylinder is 80 lbs. When the bottle is empty it weighs 60 lbs. What is the minimum acceptable gross weight of...
  41. #733 Fixed CO2 systems would not be used on crew's quarters or __________.
  42. #734 CO2 cylinders forming part of a fixed fire extinguishing system must be pressure tested at least every __________.
  43. #735 Fixed carbon dioxide extinguishing systems, for machinery spaces that are normally manned, are actuated by one control to open the stop valve in the l...
  44. #736 In a fixed carbon dioxide extinguishing system for a machinery space, designed WITH a stop valve in the line leading to the protected space, the flow...
  45. #737 Which of the following statements is true concerning the control activators, i.e., pull-handles, push-buttons or levers, for a space protected by a CO...
  46. #738 A fixed carbon dioxide extinguishing system for a machinery space, designed WITHOUT a stop valve in the line leading to the protected space, is actuat...
  47. #739 The carbon dioxide cylinders of a fixed fire extinguishing system may be located inside the protected space, if the quantity of CO2 required to protec...
  48. #740 In a fixed CO2 fire extinguishing system where pressure from pilot cylinders is used to release the CO2 from the main bank of cylinders, the number of...
  49. #741 When pilot cylinder pressure is used as a means to release the CO2 from a fixed fire extinguishing system consisting of four storage cylinders, the nu...
  50. #742 In a fixed CO2 extinguishing system where provision is made for the release of CO2 by operation of a remote control, provision shall also be made for...
  51. #743 Which of the following statements is FALSE, concerning the regulations pertaining to the cylinder room of a fixed CO2 fire extinguishing system?
  52. #744 A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause...
  53. #745 What would be a major consequence of the refrigeration system for a low-pressure CO2 fixed fire extinguishing system remaining inoperable?
  54. #746 When a ship's low-pressure CO2 fixed fire extinguishing system is activated from a remote location, what determines the quantity of CO2 being released...
  55. #747 The normal designed CO2 storage tank temperature and pressure associated with a ship's low-pressure CO2 fixed fire extinguishing system is approximate...
  56. #748 Actuating the CO2 fixed system causes the shutdown of the __________.
  57. #749 The space containing carbon dioxide cylinders shall be properly ventilated and designed to prevent an ambient temperature in excess of __________.
  58. #750 As an extinguishing agent, foam __________.
  59. #751 Why should foam be banked off a bulkhead when extinguishing an oil fire?
  60. #752 Which statement is TRUE concerning the application of foam on an oil fire?
  61. #753 The BEST method of applying foam to a fire is to __________.
  62. #754 Portable foam fire-extinguishers are designed for use on class __________.
  63. #755 A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in __________.
  64. #756 Foam extinguishes a fire mainly by __________.
  65. #757 How does foam extinguish an oil fire?
  66. #758 Firefighting foam is only effective when the foam __________.
  67. #759 Foam extinguishes a fire by __________.
  68. #760 Which statement about firefighting foam is TRUE?
  69. #761 Which statement is TRUE about fire fighting foam?
  70. #762 A foam-type portable fire extinguisher would be most useful in combating a fire in __________.
  71. #763 Portable-foam fire extinguishers are designed for use on what classes of fires?
  72. #764 Regular foam can be used on all but which flammable liquid?
  73. #765 Which type of fire is the foam (stored-pressure type) fire extinguisher effective on?
  74. #766 In the production of chemical foam by a continuous-type generator __________.
  75. #767 When water pressure of 100 psi is used in conjunction with an inline proportioner for the production of the mechanical foam, a 5-gallon can of liquid...
  76. #768 Production of mechanical foam by a portable in-line foam proportioner __________.
  77. #769 Compared to the amount of concentrated foam liquid used, the amount of low expansion mechanical foam produced is __________.
  78. #770 One gallon of low expansion foam solution will produce about __________.
  79. #771 One gallon of high expansion foam solution will produce __________.
  80. #772 Your tankship has 40 gallons of 6% foam concentrate aboard. Approximately how much foam solution can be produced from this supply?
  81. #773 When compared to low-expansion foam, a high-expansion foam will __________.
  82. #774 When compared to a high-expansion foam, a low-expansion foam will __________.
  83. #775 When compared to low-expansion foam, a high-expansion foam will __________.
  84. #776 Extra chemicals for producing chemical foam should be stored __________.
  85. #777 Foam is a very effective smothering agent and __________.
  86. #778 One of the limitations of foam as an extinguishing agent is that foam __________.
  87. #779 Semi-portable extinguishers used on inspected vessels are sizes __________.
  88. #780 How do you operate a portable CO2 fire extinguisher?
  89. #781 When used to fight fire, carbon dioxide __________.
  90. #783 In weighing CO2 cylinders, they must be recharged if weight loss exceeds __________.
  91. #784 A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be __________.
  92. #785 CO2 mainly extinguishes a fire by which of the following?
  93. #786 A type B-III CO2 extinguisher has a rated capacity of __________.
  94. #787 Which extinguishing agent is most likely to allow reflash as a result of not cooling the fuel below its ignition temperature?
  95. #788 You are having a Coast Guard inspection. All carbon dioxide fire extinguishers aboard will be __________.
  96. #789 Which statement is TRUE concerning carbon dioxide?
  97. #790 Which statement is TRUE concerning carbon dioxide?
  98. #791 What is NOT a characteristic of carbon dioxide fire-extinguishing agents?
  99. #792 Which portable fire extinguisher should be used on a class C fire on board a vessel?
  100. #793 When discharging a portable CO2 fire extinguisher, you should NOT hold the horn of the extinguisher because the horn __________.

Safety questions: what to expect

Q How many Safety questions are in the Deck pool?

There are 3,245 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 Safety module from the same pool.

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

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

Q Are these the real USCG 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.

Other Deck modules

About the Deck question pool

The Deck pool holds the current U.S. Coast Guard questions for every deck credential, from Able Seaman and the OUPV six-pack up to unlimited Master. Each question is multiple choice with four options, graded instantly, with the USCG reference shown where one exists.