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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 701–800 of 3,245 · page 8 of 33

  1. #794 In order to discharge a CO2 portable fire extinguisher, the operator must FIRST __________.
  2. #795 When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher, the stream should be directed at the __________.
  3. #797 The extinguishing agent most likely to allow reignition of a fire is __________.
  4. #798 Why is carbon dioxide (CO2) better than dry chemical for fighting a class "C" fire?
  5. #799 CO2 cylinders must be recharged when the weight of the charge in the cylinder is less than what percent of the stamped full weight of the charge?
  6. #800 Which portable fire extinguisher is normally recharged in a shore facility?
  7. #801 In continuous operation, the effective range of the 15 pound CO2 extinguisher is limited to __________.
  8. #802 To operate a portable CO2 extinguisher continuously in the discharge mode __________.
  9. #803 Weight is considered during the periodic required inspection and servicing of __________.
  10. #804 Dry chemical extinguishers extinguish class B fires to the greatest extent by __________.
  11. #805 Which statement concerning the application of dry chemical powder is FALSE?
  12. #806 When dry chemical extinguishers are used to put out class B fires, there is a danger of reflash because dry chemical_________.
  13. #807 Dry chemical fire extinguishers are effective on which type(s) of fire?
  14. #808 An "ABC" dry chemical fire extinguisher would be LEAST effective against a fire in __________.
  15. #810 When must a dry chemical fire extinguisher be recharged?
  16. #811 Which advantage does dry chemical have over carbon dioxide (CO2) in firefighting?
  17. #812 In addition to weighing the cartridge, which other maintenance is required for a cartridge-operated dry chemical extinguisher?
  18. #813 What is an advantage of a dry chemical extinguisher as compared to a carbon dioxide extinguisher?
  19. #814 The most effective extinguishing action of dry chemical is __________.
  20. #815 Which statement(s) is(are) TRUE concerning the use of dry chemical extinguishers?
  21. #816 You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________.
  22. #817 As compared to carbon dioxide, dry chemical has which advantage?
  23. #818 Which statement describes the primary process by which fires are extinguished by dry chemical?
  24. #819 An advantage of an ABC dry chemical over a carbon dioxide extinguisher is __________.
  25. #820 When electrical equipment is involved in a fire, the stream of dry chemicals should be __________.
  26. #821 You are fighting a class "B" fire with a portable dry chemical extinguisher. The discharge should be directed __________.
  27. #822 An advantage of a dry chemical over a carbon dioxide fire extinguisher is its __________.
  28. #823 One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that __________.
  29. #824 Dry chemical extinguishers may be used on what class of fires?
  30. #825 Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by __________.
  31. #826 A portable dry chemical fire extinguisher discharges by __________.
  32. #827 A stored-pressure water extinguisher is most effective against fires of class __________.
  33. #828 Which extinguishing agent is most effective on a mattress fire?
  34. #829 Which type of portable fire extinguishers is NOT designed for use on flammable liquid fires?
  35. #830 The extinguishing agent most effective for combating wood fires is __________.
  36. #831 Which type of portable fire extinguishers is NOT designed for use on flammable liquid fires?
  37. #832 The most effective fire extinguishing agent to use on burning linen is __________.
  38. #833 On a bulk chemical carrier, water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical ca...
  39. #834 The primary method by which water spray puts out fires is by __________.
  40. #835 A definite advantage of using water as a fire extinguishing agent is its characteristic of __________.
  41. #836 Which extinguishing agent will absorb the most heat?
  42. #837 The most effective cooling agent among those normally used to fight fires is __________.
  43. #838 An extinguishing agent which effectively cools, dilutes combustible vapors, removes oxygen, and provides a heat and smoke screen is __________.
  44. #839 Which extinguishing agent will cool down a heated bulkhead in the least amount of time?
  45. #840 Which fire-fighting agent is most effective at removing heat?
  46. #841 What are the most important reasons for using water fog to fight fires?
  47. #842 When using a high-velocity fog stream in a passageway, the possibility of a blow back must be guarded against. Blow back is most likely to occur when...
  48. #843 What is an advantage of water fog or water spray over a straight stream of water in fighting an oil fire?
  49. #844 Water fog from an all-purpose nozzle may be used to __________.
  50. #845 What is the BEST conductor of electricity?
  51. #846 The primary function(s) of an automatic sprinkler system is(are) to __________.
  52. #847 A spanner is a __________.
  53. #848 As seen in illustration D004SA below, what action must be taken before inserting a low-velocity fog applicator into an all-purpose nozzle? illustration
  54. #849 Fire hose should be washed with __________.
  55. #850 To lubricate the swivel or remove corrosion from a fire hose coupling, you should use __________.
  56. #851 What should be used to remove corrosion from the swivel on the female coupling of a fire hose?
  57. #852 A double male coupling is one that __________.
  58. #853 Which statement about stowing spare hose is TRUE?
  59. #854 Why is spare fire hose rolled for storage?
  60. #855 The canvas covering of fire hose is called the __________.
  61. #856 When joining the female coupling of the fire hose to the male outlet of the hydrant, you should make sure that the __________.
  62. #857 To remedy a leaking fire hose connection at the hydrant, secure the valve and __________.
  63. #858 No outlet on a fire hydrant may point above the horizontal in order to __________.
  64. #859 The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing __________.
  65. #860 Fire hose couplings __________.
  66. #861 What is the minimum number of people required to safely handle a 1-1/2 inch fire hose?
  67. #862 Which of the following statements is FALSE concerning the proper procedure in handling a fire hose?
  68. #863 Which of the following statements is FALSE concerning the proper procedure in handling a fire hose?
  69. #864 What is the minimum number of people required to safely handle a 2-1/2 inch fire hose?
  70. #865 A fire hose has a __________.
  71. #866 A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the __________.
  72. #867 The danger of a charged hose left unattended on deck with the nozzle open is __________.
  73. #868 What is the most vulnerable part of the fire main system?
  74. #869 What does the term "head" mean when applied to a fire pump?
  75. #870 Under normal firefighting conditions, approximately how far could a straight stream of water reach when the hose pressure is 100 PSI?
  76. #871 Approximately how far could a straight stream of water reach if the fire hose pressure is reduced to 60 PSI?
  77. #872 The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to __________.
  78. #873 High-velocity fog __________.
  79. #874 The spray of water in low-velocity fog will have __________.
  80. #875 You are operating a fire hose with an applicator attached. If you put the handle of the nozzle in the vertical position you will __________.
  81. #876 If a firefighting situation calls for low-velocity fog you would __________.
  82. #877 The 12-foot low-velocity fog applicator __________.
  83. #878 To get low-velocity fog from an all-purpose nozzle, you would __________.
  84. #879 The all-purpose nozzle will produce a fog spray when you __________.
  85. #880 With an approved combination nozzle, low-velocity fog is produced by __________.
  86. #881 One advantage of the "all-purpose nozzle" is that it __________.
  87. #882 On the all-purpose nozzle, the position of the valve when the handle is all the way forward is __________.
  88. #883 When the handle of an all-purpose nozzle is in the forward position, the nozzle will __________.
  89. #884 When the handle of an all-purpose nozzle is in the vertical position and without an applicator, the all-purpose nozzle will __________.
  90. #885 When the handle of an all-purpose nozzle is pulled all the way back, it will __________.
  91. #886 A combination or all-purpose nozzle produces __________.
  92. #887 The high-velocity fog tip used with the all-purpose fire fighting nozzle should always be __________.
  93. #889 The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to __________.
  94. #890 The international shore connection __________.
  95. #891 What is the function of the bypass valve on the self-contained breathing apparatus?
  96. #892 When the alarm bell sounds on a positive-pressure, self-contained breathing apparatus, how long will reserve air supply last?
  97. #893 The function of the bypass valve on the self-contained breathing apparatus is to __________.
  98. #894 You are in a tank wearing the self-contained breathing apparatus and you desire to return topside. How many tugs of the lifeline mean to take up the s...
  99. #895 A self-contained breathing apparatus is used to __________.
  100. #896 To safely enter a compartment where CO2 has been released from a fixed extinguishing system, you should __________.

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.