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Deck · 5,775 questions

Deck General - USCG Exam Questions

Seamanship in the broad sense: marlinespike, ground tackle and anchoring, mooring and towing, weather, stability basics, and day-to-day vessel operations.

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 Deck General questions

Questions 801–900 of 5,775 · page 9 of 58

  1. #876 You may be able to avoid loss of suction in a pump by __________.
  2. #877 Which of the following describes heavy fuel oils when they have been spilled?
  3. #878 You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below th...
  4. #879 The designations A, B, C, D, and E grades of cargo refer to the __________.
  5. #880 Each ship having an inert gas system must have a portable instrument to measure concentrations of hydrocarbon vapor in inert atmospheres and also to m...
  6. #881 The last 1.0 meter (3.3 feet) of vapor piping before the vessel vapor connection must be painted __________.
  7. #882 What should you use when hooking up a cargo hose to your vessel manifold?
  8. #883 U.S. regulations define several acceptable means of closure for ballast and fuel oil tank vents. Which of the following is an example of acceptable me...
  9. #884 According to U.S. regulations, tank vessels are required to have a means of emergency shutdown. This device does which of the following?
  10. #885 Which of the following statements is true?
  11. #887 What is a single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe?
  12. #888 On a tank barge constructed on or after July 1, 1951, what is the required vent size for each cargo tank?
  13. #889 According to U.S. regulations, how much hose should you use in transferring oil in bulk?
  14. #890 The combined fan discharge rate in an inert gas system is related to the __________.
  15. #891 What is the lowest temperature at which the vapors of a flammable liquid will ignite and cause self-sustained combustion in the presence of a spark or...
  16. #893 The advantages of using an inert gas system on a tank vessel is that it provides __________.
  17. #894 What is the primary hazard of liquefied petroleum gas and liquefied natural gas?
  18. #895 Which of the following will prevent a flammable atmosphere from occurring in a cargo tank on a tank vessel?
  19. #896 A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must __________.
  20. #897 The flame screens installed on tank vents that may contain combustible gases, are designed to prevent explosions by which of the following?
  21. #898 When loading a tanker, you should do which of the following?
  22. #899 How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
  23. #900 Insulating flanges minimize the dangers arising from which of the following?
  24. #901 When loading a tanker, you should __________.
  25. #902 Most crude oils are classified as grade __________.
  26. #903 Which commodity would be regulated by subchapter D, Rules and Regulations for Tank Vessels?
  27. #905 Which statement is TRUE concerning combustible gas indicators?
  28. #906 Before welding is permitted on a fuel tank, it must be certified or declared as which of the following?
  29. #907 U.S. regulations state that a person may not transfer oil or hazardous materials to or from a vessel unless each person-in-charge has signed which of...
  30. #908 How many portable fire extinguishers are required in the cargo tank area of an unmanned tank barge during cargo transfer, if the barge has no cargo pu...
  31. #909 Grade D combustible liquids have a maximum flash point of __________.
  32. #910 When using the Code of Federal Regulations (CFR's) for Tank Vessels, you see T/O and B/C. What do the T and B tell you?
  33. #911 During the ballast voyage, how are the tanks kept cold on an LNG tanker?
  34. #912 What is the flash point of a Grade D liquid?
  35. #913 The terminal indicates to you that they are going to use a booster pump to assist the discharging operation. You start the discharge, and in a few min...
  36. #914 What form of venting of cargo tanks is allowed for a tank barge certificated to carry grade B petroleum products?
  37. #915 When the inert gas system is temporarily unable to maintain a positive pressure, or an oxygen content less than 8%, how should cargo operations be adj...
  38. #916 Cargo tanks carrying grades D or E liquids on tank barges are required to be vented with which of the following?
  39. #917 What is NOT a precaution to be taken when topping off?
  40. #918 You are loading 465,000 barrels of cargo oil. At 0900 you find that you have loaded 207,000 barrels. At 1030 you find that you have loaded 223,000 bar...
  41. #919 Each hose used for transferring vapors must be which of the following?
  42. #920 A tug should not come alongside a tank vessel in way of its cargo tanks while it is loading grade A, B, or C cargo without the permission of the _____...
  43. #921 Ullage measurements are taken from the top of the liquid to which of the following points?
  44. #922 For the purpose of regulating tank vessels, flammable liquids are liquids which will __________.
  45. #923 What is NOT a precaution to be taken when topping off?
  46. #924 What best describes for how long a gas-free test is good?
  47. #925 A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade __________.
  48. #926 A cargo of 10,000 barrels of gasoline is loaded at a temperature of 90°F, and a cargo temperature of 55°F, is expected on this voyage. It has a coeffi...
  49. #927 What does the LNG cargo pumps capacity depends upon?
  50. #928 To determine which grades of cargo a tank vessel is permitted to carry you should __________.
  51. #929 You have berthed in a port area with other tank vessels. What signal is displayed by a vessel to indicate it is transferring flammable or combustible...
  52. #930 You start a centrifugal cargo pump to discharge cargo. The pump works fine for awhile and then loses suction. What could have caused this?
  53. #932 According to U.S. regulations, access to a cargo pumproom in a tank vessel carrying grades C or D liquid cargo must be which of the following?
  54. #934 In reference to accidental oil pollution, the most critical time during bunkering is when __________.
  55. #935 You have been carrying a liquid with flammable limits of 1% to 7% mixture with air. If your instructions say that no one shall enter the tank if the v...
  56. #936 According to U.S. regulations, which of the following describes the declaration of inspection?
  57. #937 What type of vent is required on a barge transporting No. 6 fuel oil?
  58. #938 What is meant by "thieving" a petroleum cargo?
  59. #939 Your vessel is taking on cargo oil when a small leak develops in the hose. You order the pumping stopped. Before you resume pumping, which of the foll...
  60. #940 Tankers that are in service carrying "sour crudes" are faced with additional problems for their safe operation. One such problem is called "polyphoric...
  61. #941 When inspecting a tank barge to see that it has all the required fire extinguishers and other safety items aboard, which of the following is the best...
  62. #942 The scuppers had been plugged as required at the time an oil spill occurs on deck. After shutting down the transfer, the engine room should first be i...
  63. #943 On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?
  64. #945 If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked, when is it required to be hau...
  65. #946 When selecting the fuel oil tanks for the "burn-out" of bunkers during a voyage consideration of all of the following must be taken with the EXCEPTION...
  66. #947 Regulations require that cargo pumps in tank vessels carrying grade D liquid cargo shall be isolated from sources of vapor ignition by __________.
  67. #948 Which is the MOST important consideration for a tank vessel?
  68. #949 Name one major advantage of transporting gas under refrigeration.
  69. #950 Open ullage holes in tanks which are not gas-free must be protected by __________.
  70. #951 According to U.S. regulations, what is required where cargo pump shafts on tankers pierce bulkheads?
  71. #952 On a vessel, constructed after 1970, carrying grades A, B, C or D cargoes, what can NOT segregate enclosed spaces where sources of vapor ignition are...
  72. #953 In controlling pollution, which action should be taken after all dirty ballast has been transferred to the slop tank and prior to discharge through th...
  73. #954 Pinching of the cargo hose between the vessel and the dock should be prevented by __________.
  74. #956 According to the regulations, normally, manholes in LFG tanks are located __________.
  75. #957 What type of heat must be applied in order to raise the temperature of water from 60 degrees F to 180 degrees F?
  76. #958 You are in the process of loading 465,000 barrels of cargo oil. At 1030, on 5 November, you gauge the vessel and find that you have loaded 203,000 bar...
  77. #959 You start a centrifugal cargo pump to discharge cargo. The pump works for a while and then loses suction. This could be caused by __________.
  78. #960 Which factor must be considered when determining the order of loading of dissimilar products through the same piping system aboard a tanker?
  79. #961 When bunkering at a dock which of the following signals must be displayed?
  80. #962 Which of the following describes the flash point temperature of a liquid?
  81. #963 Regulations require that venting for cargo tanks in which only grades D or E liquids are to be transported shall, as a MINIMUM, be of which type? (tan...
  82. #964 To prevent the overflow of cargo tanks due to expansion, where should you top off?
  83. #965 What certificate verifies that a liquefied gas tanker complies with the requirements with regard to their structure, equipment, fittings, arrangements...
  84. #966 Every U.S. crude oil tankship with a keel laying date on or after 1/1/75, shall be equipped with an inert gas system if the tonnage is more than _____...
  85. #967 A portion of the cargo of an LNG carrier boils off during each voyage. How is the cargo boil off normally handled?
  86. #968 When discharging cargo from a tank barge, in which case may the cargo pass through or over the towing vessel?
  87. #969 What is the heat given to or given up by a substance while changing state?
  88. #970 According to Coast Guard Regulations (46 CFR), when loading, or discharging oil in bulk at a dock, which of the following signals must be displayed?
  89. #971 What is the most common liquified gas cargo?
  90. #972 What is the first action you should take to prevent oil from escaping into the sea when ballasting through the cargo piping system?
  91. #973 You are loading 530,000 barrels of cargo oil. At 0945 on 13 April, you find that you have loaded 202,000 barrels. At 1130, you find that you have load...
  92. #974 A tanker is loaded with 12,000 barrels of #2 fuel oil. The temperature of the product is 88°F. API gravity is 39°. The volume correction factor (VCF)...
  93. #975 How many low-velocity spray applicators are required on the weather decks of a tankship?
  94. #976 You are requisitioning stores for your tank vessel. What type of matches are permitted aboard?
  95. #977 What is NOT a requirement of cargo piping installed in tank vessels carrying grade D or E cargo ONLY?
  96. #978 You are planning to use the crude oil washing system on your tankship. What is required to prevent electrostatic buildup in the tanks?
  97. #979 Which of the terms best describes the process of the production of vapor above the surface of a boiling cargo due to evaporation on an LNG tanker?
  98. #980 What is a characteristic of all centrifugal cargo pumps?
  99. #981 What type of vent is required on a barge transporting No. 6 fuel oil?
  100. #982 The most likely time for oil pollution while bunkering is when __________.

Deck General questions: what to expect

Q How many Deck General questions are in the Deck pool?

There are 5,775 Deck General 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 Deck General module from the same pool.

Q What score do I need to pass the Deck General module?

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

Q Are these the real USCG Deck General 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 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.