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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 901–1,000 of 5,775 · page 10 of 58

  1. #983 Which statement is TRUE concerning deep well self-priming pumps?
  2. #984 Cargo tanks on barges fitted with goose neck vents and flame screens are limited to carrying which grade of cargo?
  3. #985 You have completed a crude oil wash. What action should be taken with the oil in the lines running to the washing machines?
  4. #986 Which of the following is an example of a example of a grade D product?
  5. #987 A tank is loaded with 9,000 barrels of gasoline. The temperature of the product is 80°F (27°C), and it has a coefficient of expansion of .0008. The ne...
  6. #988 What is the gas above the liquid in an LNG tank?
  7. #989 Which cargo grade(s) are permitted by regulations to be carried on a barge in tanks fitted only with gooseneck vents and flame screens?
  8. #990 The component in an inert gas system used for cleaning the gas of solid and sulfur combustion products, while simultaneously cooling the inert gas, is...
  9. #991 According to U.S. regulations, how many emergency outfits are required to be carried onboard all tankships over 1,000 gross tons?
  10. #992 Your tank vessel is fully loaded to the marks, and you find that she is down slightly by the head. Which of the following choices would be the best ac...
  11. #994 Which statement is FALSE concerning precautions during fueling operations?
  12. #995 Which method is used to supply inert gas from a flue gas system to the cargo tanks?
  13. #996 U.S. regulations require cargo pump rooms, on tank vessels handling grades A, B, or C liquid cargo, shall be equipped with power ventilation of the ex...
  14. #998 You are crude oil washing on a tanker with an inert gas system. What percentage of oxygen must the inert gas system produce and deliver to the tanks?
  15. #999 A relief valve for a cargo pump is generally installed __________.
  16. #1000 A tanker is loaded with 8,000 barrels of fuel oil. The temperature of the cargo is 50°F. API gravity is 37°. The volume correction factor (VCF) is .00...
  17. #1001 LNG containment insulation performs all of the following functions, except which of the following?
  18. #1002 When discharging clean ballast prior to entering a loading port, what must you do if it is determined the ballast exceeds 15 parts per million of oil?
  19. #1003 According to regulations, which grade(s) of cargo may be carried in tanks that are vented only with gooseneck vents and flame screens?
  20. #1004 The valve on the discharge side of a cargo pump on a tank vessel will usually be a __________.
  21. #1005 A vessel loads edible oil in a deep tank through a manhole at the mid-length of the tank. In order to fill the tank to maximum capacity, what trim sho...
  22. #1006 How is the amount of LFG that may be loaded into a given tank determined?
  23. #1007 What happens to the volume of flammable and combustible liquids when temperature is increased?
  24. #1008 Remote controls for quick-closing shut off valves are required in how many location(s)?
  25. #1009 A tank holds 400 tons of sea water when filled. How many tons of liquid of specific gravity 0.9300 will it hold when filled to 90% capacity?
  26. #1010 Which statement about entry into a water ballast tank that has been sealed for a long time is TRUE?
  27. #1011 Which step is NOT generally taken when gas-freeing a tank?
  28. #1012 What is meant by "thieving" a petroleum cargo?
  29. #1013 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...
  30. #1015 Branch venting, from safety relief valves on barges, shall be constructed to discharge gas at what minimum vertical height above the weather deck?
  31. #1016 Cargo tanks on barges fitted with goose neck vents and flame screens are limited to carrying which grade of cargo?
  32. #1017 Which statement about the inert gas system is TRUE?
  33. #1018 When loading bulk liquid cargo, what is the first action you should take if a cargo valve jammed open?
  34. #1019 What percent of oxygen content by volume, must each inert gas system be designed to supply the cargo tanks with a gas, or mixture of gases?
  35. #1020 During loading and discharging operations, in addition to when the cargo tanks have been properly filled, each inert gas system must be capable of mai...
  36. #1021 Which spaces are required to be segregated from cargo tanks carrying grades A, B, C, or D cargoes?
  37. #1022 The only portable electrical equipment permitted in a compartment which is not gas free is a lamp that is __________.
  38. #1023 Before welding in a tank that has carried petroleum products, the tank must be certified by __________.
  39. #1025 Cargo hose carried on tank vessels shall be able to withstand a pressure of at least how many psi?
  40. #1026 What must cargo pumps in tank vessels carrying grade D liquid cargo be isolated from sources of vapor ignition by?
  41. #1027 What is an advantage of a gate valve over a butterfly valve?
  42. #1029 Which of the following will be the indication of the tendency of a grade "B" product to vaporize?
  43. #1030 According to U.S. regulations which of the following statements is correct regarding the fuel oil containment around loading manifolds?
  44. #1031 By regulation, cargo tank atmosphere must be inert before and during which operation?
  45. #1032 What must cargo tanks be fitted with to prevent over pressurization when loading liquid petroleum products?
  46. #1033 A tanker is loaded with 8,000 barrels of fuel oil. The temperature of the cargo is 50°F. API gravity is 37°. The volume correction factor (VCF) is .00...
  47. #1034 What is an advantage of the spherical type containment system?
  48. #1035 The vapor pressure of a gas is defined as the pressure necessary to keep it in what state?
  49. #1036 According to U.S. regulations, which grade(s) of cargo may be carried in tanks that are vented only with gooseneck vents and flame screens?
  50. #1037 Which of the following describes the requirement for ventilation spaces of a gas safe space within the cargo area?
  51. #1038 What type of gas detection device is used to determine when gassing up is complete?
  52. #1039 Sounding tubes and access openings for fuel oil tanks on cargo vessels are permitted by U.S. regulations to be located in which of the listed spaces?
  53. #1041 How many, and what type, fire extinguishers are required on an unmanned oil barge during transfer operations, if the barge has no cargo pumps aboard?
  54. #1042 When stripping a tank, excessive air in the suction line may cause __________.
  55. #1043 The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section is call...
  56. #1044 Your ship departed Venezuela for New York, loaded with 10,000 barrels of crude oil, whose average cargo temperature was 30°C (86°F). API is 25°. The v...
  57. #1045 Which of the following terms best defines the spontaneous mixing of a tank's liquid contents when a heavier layer forms above a less dense lower layer...
  58. #1046 In special cases, the Commandant of the Coast Guard may permit cargo piping to pass through machinery spaces. This is permitted provided that the only...
  59. #1047 Introducing inert gas into a tank already inert with the object of further reducing the oxygen or hydrocarbon content to prevent combustion if air ent...
  60. #1048 When tank cleaning with a portable machine, the weight of the machine is suspended from __________.
  61. #1050 A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame __________.
  62. #1051 On what type of pump would you find an impeller?
  63. #1052 U.S. regulations require that cargo tanks in which grades B or C liquids are carried must be vented with which of the following?
  64. #1053 When cleaning cargo tanks with portable machines, how is the machine grounded?
  65. #1054 With an increase in temperature the volume of flammable and combustible liquids __________.
  66. #1055 What is NOT required of the cargo tank venting on a tank barge carrying grade A liquids?
  67. #1056 Flames from small leaks of LFG may be extinguished by __________.
  68. #1057 You are planning to use a crude oil washing system. What precaution must be taken with the source tank for the washing machines?
  69. #1058 You are towing a 1000 gross ton gasoline tank barge. Regulations say that cargo tank hatches, ullage holes, and Butterworth plates may remain open wit...
  70. #1059 Which pump must always be primed?
  71. #1060 In case of a LNG leak from a liquid header flanged connection, what is the first precautionary action to take?
  72. #1061 A tank barge equipped with an internal-combustion engine-driven cargo pump on the weather deck shall be provided with a minimum of one remote manual s...
  73. #1062 The vapor pressure of a gas is the pressure necessary to keep it in a(n) __________.
  74. #1063 A chemical additive to LPG gives it a characteristic __________.
  75. #1064 The final inspection responsibility for seeing that a tank barge is provided with the required equipment and fittings in good and serviceable conditio...
  76. #1065 Most liquified gas cargoes are flammable, and are carried at or close to their boiling point. What will happen if they are released into the atmospher...
  77. #1066 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...
  78. #1068 Which statement about the pressure in a tank being inerted by an inert gas system is TRUE?
  79. #1069 Cargo hose carried on tank vessels must be designed to withstand the pressure of the shutoff head of the cargo pump or pump relief valve setting, but...
  80. #1070 While underway and towing an unmanned tank barge you are required to __________.
  81. #1071 What pressure shall cargo hoses carried on tank vessels be able to withstand?
  82. #1072 An inert gas system is designed to reduce the possibility of tank explosions by __________.
  83. #1073 Which function is NOT provided by the scrubber of an inert gas system?
  84. #1074 Which of the following is not an acceptable means to measure a liquid level in a cyrogenic cargo tank?
  85. #1075 Your ship has loaded 9,000 barrels of fuel oil at a cargo temperature of 35°C (95° F). API gravity is 44°. The volume correction factor (VCF) is .0005...
  86. #1076 What is the minimum temperature required in order for steam driven pumps to be considered a source of vapor ignition?
  87. #1077 What is the proper direction of flow through a globe valve when the valve is installed to be in a normally open position?
  88. #1078 Which statement about inert gas pressures in a cargo tank is TRUE?
  89. #1079 You are on a tankship discharging oil. what happens to the remaining oil when all of the oil that the main cargo pumps can handle is pumped out of a t...
  90. #1080 Which of the following is a characteristic of Methane gas?
  91. #1081 Which statement is TRUE of centrifugal pumps aboard tank vessels?
  92. #1082 What is the major function of the deck water seal in an inert gas system?
  93. #1083 Your ship has loaded 9,000 barrels of fuel oil at a cargo temperature of 35°C (95°F). API gravity is 44°. The volume correction factor (VCF) is .0005....
  94. #1085 What percent of oxygen content by volume, must each inert gas system be designed to supply the cargo tanks with a gas, or mixture of gases?
  95. #1086 By regulation, cargo tank atmosphere must be inert before and during which operation?
  96. #1088 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 is referred to as...
  97. #1089 Each hose used for transferring vapors must __________.
  98. #1090 The tank barge on which you are preparing to load petroleum is required to have on board one B-II fire extinguisher. What does NOT meet this requireme...
  99. #1091 Which of the following best describes the heat value of a fuel?
  100. #1092 A B-II fire extinguisher has a minimum capacity of __________.

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.