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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 901–1,000 of 3,245 · page 10 of 33

  1. #999 What is the proper direction of flow through a globe valve when the valve is installed to be in a normally open position?
  2. #1000 On what type of pump would you find an impeller?
  3. #1001 What is the purpose of a check valve?
  4. #1002 What is the purpose of a vent header?
  5. #1003 Overspeed of the diesel engine driving an electric generator could cause __________.
  6. #1004 What causes cavitation in a centrifugal pump?
  7. #1005 What is the operating principal of a flash type evaporator?
  8. #1006 What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing?
  9. #1007 Why does a centrifugal bilge pump require priming?
  10. #1008 In an emergency, the electro-hydraulic steering units can be directly controlled by the __________.
  11. #1009 According to the Code of Federal Regulations, which of the following statements is correct regarding the steering gear on a vessel contracted for afte...
  12. #1010 Mechanical gearing of deck machinery such as the windlass or towing engine should __________.
  13. #1011 Mechanical gearing of deck machinery such as the windlass or boat hoists should __________.
  14. #1012 The follow-up gear on an electro-hydraulic steering gear __________.
  15. #1013 In an electro-hydraulic steering system, rudder movement is maintained in close synchronization with the steering wheel position by means of the _____...
  16. #1014 Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by __________.
  17. #1015 Dual electro-hydraulic steering units usually operate __________.
  18. #1016 When the helm is turned on the navigation bridge, which of the listed actions will be the FIRST response in the steering room on a ship equipped with...
  19. #1017 Under normal operating conditions, the rudder is hydraulically locked unless __________.
  20. #1018 A hydraulic accumulator is designed to __________.
  21. #1019 What is NOT used as a stern tube bearing, on a large vessel?
  22. #1020 What type of stern tube bearing has the least friction?
  23. #1021 What is the principle behind dynamic braking as used on an anchor windlass?
  24. #1022 What is the most probable cause of reduced capacity in a reciprocating air compressor?
  25. #1023 When two generators are operating in parallel, what will happen if one engine driving a generator shuts down?
  26. #1024 What is the function of an air receiver in the compressed air system?
  27. #1025 Where a propeller shaft passes through the hull, water is prevented from entering by means of a __________.
  28. #1026 What does a pyrometer measure on a diesel engine?
  29. #1027 What power source actuates a solenoid valve?
  30. #1028 What is the purpose of a striker plate?
  31. #1029 What is the function of wearing rings found on some centrifugal pumps?
  32. #1030 A thrust block is designed to __________.
  33. #1031 What quality of a diesel fuel is most significant for efficient combustion?
  34. #1032 The brickwork surrounding the firebox of a boiler is known as __________.
  35. #1033 What is NOT a function of the steam drum of a marine water-tube boiler?
  36. #1034 A spark arrestor __________.
  37. #1035 Diesel engines are considered safer than gasoline engines because __________.
  38. #1036 What monitoring device best indicates the load being carried by a diesel engine?
  39. #1037 A wobbling tail shaft is an indication of __________.
  40. #1038 After an engine is started you should __________.
  41. #1039 During fueling, all doors, hatches, and ports __________.
  42. #1040 Lubricating oil should be changed on a heavy duty diesel engine when __________.
  43. #1041 Generally speaking, the fuel injected into a marine diesel engine combustion chamber is ignited by __________.
  44. #1042 How should you warm up a diesel engine that has not been run for some time?
  45. #1043 How would the exhaust of a properly operating diesel engine appear?
  46. #1044 What would white exhaust smoke from a diesel engine probably mean?
  47. #1045 Each cylinder in a two cycle engine experiences combustion __________.
  48. #1046 How does combustion air enter the cylinder of a two-cycle diesel engine?
  49. #1047 What are the three basic types of engine starters?
  50. #1048 The quickest method to stop a small diesel engine whose throttle or governor has become stuck open is to __________.
  51. #1049 Most medium and slow speed diesels are started by what medium?
  52. #1050 What condition will result in the automatic shutdown of a diesel engine?
  53. #1051 The three conditions which cause engine shutdown are overspeed, low lube oil pressure, and __________.
  54. #1052 If an engine shuts down due to high jacket water temperature, what action should be taken?
  55. #1053 Diesel engines obtain combustion air through turbo chargers, blowers, or __________.
  56. #1054 What is the purpose of the intake/exhaust valves in a diesel engine?
  57. #1055 What is the best indication of the loading of a diesel engine?
  58. #1056 All marine low-speed diesels are of what design?
  59. #1057 All diesel engines are classified as __________.
  60. #1058 Overspeed of the diesel engine driving an electric generator could cause __________.
  61. #1059 Sudden unloading of a diesel engine can cause __________.
  62. #1060 What is one effect of running a diesel engine at too cool a temperature?
  63. #1061 If you are unable to stop a diesel engine by any other means, you should __________.
  64. #1062 The most serious effect of air trapped in a non-treated diesel engine jacket water cooling system is that it __________.
  65. #1063 The most serious effect of trapped air in a diesel engine jacket water cooling system is that it __________.
  66. #1064 The most serious effect of oxygen retained in a diesel engine jacket water cooling system is that it __________.
  67. #1065 What factor is essential to the proper operation of a radiator cooled engine?
  68. #1066 What is an advantage of diesel over steam turbine propulsion?
  69. #1067 What is the effect of heated intake air on a diesel engine?
  70. #1069 In a water tube marine boiler, what protects the superheater tubes from the fires of combustion?
  71. #1070 In a water-tube marine type boiler, after the steam leaves the generating tubes, in what part of the boiler is temperature of the steam increased?
  72. #1071 What is NOT a function of the steam drum of a marine water-tube boiler?
  73. #1072 What does blowing tubes accomplish?
  74. #1073 Before starting any diesel or gasoline engine, which of the following must be checked?
  75. #1074 You discover a leak in the fuel line to the engine. You should FIRST __________.
  76. #1075 Maintaining good working order of fuel pumps and injectors in auxiliary diesel engines requires the use of __________.
  77. #1076 Outlets in gasoline fuel lines are __________.
  78. #1077 The exhaust pipe must be gas tight throughout its entire length otherwise __________.
  79. #1078 If a gasoline engine turns over freely but will not start, the cause is generally __________.
  80. #1079 To find the cause of a gasoline engine's failure to start, you should __________.
  81. #1080 A safe fuel system must __________.
  82. #1081 Before any machinery is put in operation, you should __________.
  83. #1082 Which statement is TRUE concerning fuel vapors on a vessel?
  84. #1083 Which of the following is one of the most important safety procedures that should be adhered to prior to starting a gasoline engine on a motorboat?
  85. #1084 Which statement is TRUE concerning gasoline vapors on board a vessel?
  86. #1085 The nozzle of a gasoline hose or can should be kept __________.
  87. #1086 Before you start an engine in a compartment, it's MOST important to __________.
  88. #1087 Which statement is FALSE concerning precautions during small craft fueling operations?
  89. #1088 The carburetor is placed on the engine to __________.
  90. #1089 When fueling has been completed __________.
  91. #1090 Gasoline tanks should be filled __________.
  92. #1091 Upon completion of fueling a gasoline driven vessel it is necessary to __________.
  93. #1092 You are in a tank wearing a breathing apparatus and you desire to return topside. How many tugs of the lifeline mean "Take up slack"?
  94. #1093 What factor is essential to the proper operation of a radiator cooled engine?
  95. #1094 In illustration D015SA below, which item number correctly identifies the weak link? illustration
  96. #1095 In illustration D014SA below, what number is the sea painter? illustration
  97. #1096 In illustration D014SA below, which item number correctly identifies the sea anchor? illustration
  98. #1097 In illustration D014SA below, where would you find the knife? illustration
  99. #1099 In illustration D014SA below, which item is the righting strap? illustration
  100. #1100 In illustration D014SA below, which item number correctly identifies the ballast bags? illustration

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.