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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 1,201–1,300 of 5,775 · page 13 of 58

  1. #1300 What do gas compressors on an LNG vessels provide the motive force to do?
  2. #1301 What is the term used for evaporated LNG?
  3. #1302 What is one of the principal dangers inherent in liquefied petroleum gas?
  4. #1304 What is the LNG cargo term "rollover" used to describe?
  5. #1305 What is generally, the first action in extinguishing an LFG fire caused by escaping gas?
  6. #1306 What is the preferable way to extinguish an LNG fire?
  7. #1307 Which is NOT a safety precaution to be observed during the loading of LFG?
  8. #1308 What device will be activated while loading a LNG tank and the HI-HI liquid level set point is reached?
  9. #1309 What is one major advantage of transporting gas under refrigeration?
  10. #1310 What is the Inert gas plant on an LNG vessel designed to produce?
  11. #1311 Which product is most likely to accumulate static electricity?
  12. #1312 Flammable liquid means any liquid which gives off flammable vapors at or below __________.
  13. #1313 Combustible liquids are divided into how many grades?
  14. #1314 Combustible liquid is defined as any liquid having a flash point above __________.
  15. #1315 A combustible liquid with a flash point of 90°F would be grade __________.
  16. #1316 A flammable liquid having a Reid vapor pressure of 8½ P.S.I.A. or less and a flash point of 80°F or below is grade __________.
  17. #1317 Grade E combustible liquids have a flash point of __________.
  18. #1318 Butadiene, inhibited, is labeled as a __________.
  19. #1319 The vapor pressure of a substance __________.
  20. #1320 When referring to quantity of barite in a P-tank, ullage is the __________.
  21. #1321 Which of the following reacts dangerously with vinyl chloride?
  22. #1322 You have orders to load cargoes of carbon disulfide, diisopropylamine and pyridine on your multi-product tankship. Which statement is TRUE?
  23. #1323 What is the flash point of vinyl chloride?
  24. #1324 Which factor must be considered when determining the order of loading of dissimilar products through the same piping system aboard a tanker?
  25. #1325 What is the temperature at which a vapor mixture, at a given pressure, begins to condense?
  26. #1327 Which of the following describes the relationship between the vapor pressure of a substance and temperature?
  27. #1328 What is the general name given to propane, butane, and mixtures of the two?
  28. #1329 Which of the following describes one of the principle dangers inherent in liquified petroleum gas?
  29. #1330 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...
  30. #1331 While discharging a tanker, list can be controlled by __________.
  31. #1332 When discharging an oil cargo, the first consideration is to __________.
  32. #1333 Which tanker discharge pattern would be the safest and most efficient?
  33. #1334 You are on a tankship discharging oil. When all of the oil that the main cargo pumps can handle is pumped out of a tank, the remainder is __________.
  34. #1335 Which tanker discharge pattern would be the safest and most efficient?
  35. #1336 While discharging a cargo, the stripping of the tanks falls behind schedule. What does this indicate?
  36. #1337 Where would you expect to find a "charged mist" on a tanker?
  37. #1338 Your tank vessel is loaded down to her marks, and you find that she has too much trim by the stern. To adjust the trim you may __________.
  38. #1339 Your tank vessel is fully loaded, and you find that she is down slightly by the head. To adjust the trim, you may __________.
  39. #1340 When loading bulk liquid cargo, what is the FIRST action you should take if a cargo valve jammed open?
  40. #1341 Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because __________.
  41. #1342 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...
  42. #1343 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...
  43. #1344 When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery, check it __________.
  44. #1345 The term "load on top" is used on many crude oil carriers, what is this a method for?
  45. #1346 Where do you check when measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery?
  46. #1347 Petroleum cargo tanks should not be topped off at deck level when loading on a cold day due to which of the following?
  47. #1348 When cleaning a tank by the Butterworth process, you should begin to pump out the slops __________.
  48. #1349 What is NOT a requirement for the safe and effective use of a crude oil washing system?
  49. #1350 You are planning to use a crude oil washing system. What precaution must be taken with the source tank for the washing machines?
  50. #1351 You have water washed your cargo tanks using the fixed machines. What should you do before using portable machines to clean areas screened from the wa...
  51. #1352 The complete details of a crude oil washing system aboard your vessel, including the operating sequences and procedures, design characteristics, a des...
  52. #1353 You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE?
  53. #1354 You have completed a crude oil wash. What action should be taken with the oil in the lines running to the washing machines?
  54. #1355 What is the maximum percent of oxygen, by volume, allowed to be maintained in the cargo tanks prior to the commencement of crude oil tank washing?
  55. #1356 What is NOT a requirement for the safe and effective use of a crude oil washing system?
  56. #1357 In order for you to operate your vessels crude oil wash system, the cargo tanks to be washed must be which of the following?
  57. #1358 Where will the complete details of a crude oil washing system aboard your vessel, including the operating sequences and procedures, design characteris...
  58. #1359 You are planning to use the crude oil washing system on your tankship. What is required to prevent electrostatic buildup in the tanks?
  59. #1360 You have water washed your cargo tanks using the fixed machines. What should you do before using portable machines to clean areas screened from the wa...
  60. #1361 Which of the following shall be used to isolate fire hydrant valves on a crude oil tanker from the crude oil washing system?
  61. #1362 Static electricity may be built up by the __________.
  62. #1363 Your vessel is taking on cargo oil when a small leak develops in the hose. You order the pumping stopped. Before you resume pumping, you should ______...
  63. #1364 In order to reduce the accumulation of static electricity while loading petroleum products, you should __________.
  64. #1365 Which topic is NOT required to be discussed at the pre-transfer conference?
  65. #1366 When carrying a cargo of asphalt or molten sulfur, which are carried at temperatures of over 300°F, one of the biggest dangers is __________.
  66. #1367 The most likely location for a liquid cargo fire to occur on a tanker would be __________.
  67. #1368 A flame screen __________.
  68. #1369 Fuel oil tank vents are fitted with a screen which will stop __________.
  69. #1370 How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?
  70. #1371 What is acceptable flame screening?
  71. #1372 What must be present in order for combustion to occur inside a piping system such as a vapor collection header in a marine emission control system?
  72. #1373 What is the proper first aid for LPG in the eye?
  73. #1374 When planning the loading or discharging of a VLCC (100,000 DWT+) what is the most important consideration?
  74. #1375 Asphyxia is generally limited to enclosed spaces, and the deficiency of breathable air in an enclosed space can occur with any of the following condit...
  75. #1376 What is a enclosure which will withstand ignition of a flammable gas, and which will prevent the transmission of any flame able to ignite a flammable...
  76. #1377 What can be used to prevent a flammable atmosphere from occurring in a tank container?
  77. #1378 Which extinguishing agent is effective in combating an isoprene fire?
  78. #1379 Which signal must you display at night on a docked tank barge to show that it is loading or discharging flammable liquid cargo?
  79. #1380 What color must the last 1.0 meter (3.3 feet) of piping before the vessel vapor connection be painted?
  80. #1381 The Federal Water Pollution Control Act requires the person in charge of a vessel to immediately notify the Coast Guard as soon as he/she knows of any...
  81. #1382 Which of the following describes (auto) ignition temperature?
  82. #1383 Which type of portable lighting may be used to enter a compartment on a tank barge which is NOT gas-free?
  83. #1385 Which step is NOT generally taken when gas-freeing a tank?
  84. #1386 A marine chemist issues gas free certificates and is certified by which organization?
  85. #1387 Which statement about entry into a space that has been sealed for a long time is TRUE?
  86. #1389 Which statement about entering into a tank which has been sealed for a long time is TRUE?
  87. #1390 A marine chemist issues gas free certificates and is certified by the __________.
  88. #1391 Who will certify the vessel to be gas free before entering the shipyard?
  89. #1392 According to U.S. regulations, which conditions would not disqualify a nonmetallic hose as being suitable for use in transferring oil?
  90. #1393 According to U.S. regulations, which of the following conditions would disqualify a nonmetallic hose as being suitable for use in transferring oil?
  91. #1394 U.S. regulations require which of the following upon completion of oil transfer operations?
  92. #1395 According to U.S. regulations, no person may transfer oil to or from a vessel unless each person in charge has signed what document?
  93. #1396 Which of the following describes the Declaration of Inspection required prior to the transfer of fuel?
  94. #1397 On tankers ullages are measured from what point?
  95. #1398 What does the sign used to caution persons approaching the gangway of a tank barge during cargo transfer read?
  96. #1399 On tankers using manually operated tank valves, what does the deck hand wheel indicator register?
  97. #1400 Each pressure gage used in an oil transfer operation must be accurate to within what percent?
  98. #1401 Each pressure gage used in an oil transfer operation must be accurate to within what percent?
  99. #1402 What is the purpose of the relief valve of a cargo pump?
  100. #1403 When two ballast pumps used for deballasting a single tank start cavitating, what action should you take?

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.