Assessment Test

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1. When a vessel is inclined at a small angle the center of buoyancy will __________.

 
 

2. Your vessel rolls slowly and sluggishly. This indicates that the vessel __________.

 
 

3. When the height of the metacenter is greater than the height of the center of gravity a vessel has which type of stability?

 
 

4. In small angle stability theory, the metacenter is located at the intersection of the inclined vertical centerline and a vertical line through __________.

 
 

5. Which formula can be used to calculate metacentric height?

 
 

6. When initial stability applies, the height of the center of gravity plus the metacentric height equals the __________.

 
 

7. A vessel with a large GM will __________.

 
 

8. With no environmental forces acting on the vessel, the center of gravity of an inclined vessel is vertically aligned with the __________.

 
 

9. When a vessel has positive stability, the distance between the line of force through B and the line of force through G is called the __________.

 
 

10. The ship's tanks most effective for trimming are the __________.

 
 

11. When a vessel's LCG is aft of her LCB, the vessel will __________

 
 

12. Longitudinal moment is obtained by multiplying a vessel's weight and its __________.

 
 

13. A ship's forward draft is 22'-04" and its after draft is 23'-00". The draft amidships is 23'-04". This indicates a concentration of weight __________.

 
 

14. A vessel's bottom will be subjected to tension when weight is concentrated __________.

 
 

15. When a vessel is stationary and in a hogging condition, the main deck is under __________.

 
 

16. Your vessel has a midships engine room and the cargo is concentrated in the end holds. The vessel is __________.

 
 

17. What is not usually a concern when loading a single-hulled tanker?

 
 

18. Your vessel is floating in water of density 1.010. The fresh water allowance is 8 inches. How far below her marks may she be loaded so as to float at her mark in saltwater of density 1.025?

 
 

19. A bulk freighter 680 ft. in length, 60 ft. beam, with a waterplane coefficient of .84, is floating in salt water at a draft of 21'. How many long tons would it take to increase the mean draft by 1"?

 
 

20. A tanker's mean draft is 32'-05". At this draft, the TPI is 178. The mean draft after loading 1200 tons will be __________.

 
 

21. Your vessel is on an even keel. The MT1 of your vessel is 1000 ft-tons. How many tons of cargo must be loaded in number 4 hold which is 100 feet abaft the tipping center, if she is to have a 2 foot drag?

 
 

22. Your vessel's existing draft is FWD 17'-04", AFT 18'-08". Using the Guidance Manual for Loading M.V. GRAND HAVEN, determine the new draft if 765 long tons are discharged from No. 7 hatch.

 
 

23. Your vessel's existing draft is FWD 19'-02", AFT 20'-10". Using the Guidance Manual for Loading M.V. GRAND HAVEN, determine the new draft if 170 long tons are discharged from No. 8 hatch.

 
 

24. Using the Guidance Manual for Loading M.V. Grand Haven, determine the amount of ballast required in tank No.1 (P&S) to maintain drafts of 17'-00" forward and 22'-06" aft for a vessel loaded with grain which has a test weight of 39.5 lbs.

 
 

25. Assuming that the recommended hatch loading sequence is followed, how many long tons of iron ore may be loaded through hatch No. 20 while using a single belt loader to arrive at a desired mean keel draft of 29'-06"? (Use the Guidance Manual for Loading M.V. GRAND HAVEN.)

 
 

26. Your vessel's existing draft is FWD 24'-08", AFT 25'-04". Using the Guidance Manual for Loading M.V. GRAND HAVEN, determine the new draft if 180 long tons are loaded in No. 23 hatch.

 
 

27. Assuming that the recommended hatch loading sequence is followed, how many long tons of iron ore may be loaded through hatches 2, 6, & 10, while using a single belt loader, to arrive at a desired mean keel draft of 27'-07"? (use the Guidance Manual for Loading M.V. GRAND HAVEN)

 
 

28. What should you be concerned with when loading and securing vehicles on a Ro-Ro?

 
 

29. What is NOT required as special safety equipment on a tankship carrying hazardous cargoes in bulk?

 
 

30. What is NOT considered "jewelry"?

 
 

31. What product is considered a noxious liquid substance for regulatory purposes?

 
 

32. In towing, heaving lines are used for __________.

 
 

33. One advantage of chain over wire rope for a tow bridle is that chain __________.

 
 

34. To reconnect a broken tow line, it is better to use a polypropylene messenger line because it __________

 
 

35. According to the regulations, what fire safety control feature is required in quick-closing shut off valves?

 
 

36. For the purposes of cargo oil containment, the fixed container under the manifold of an eight-inch loading line must hold a minimum of __________.

 
 

37. Your vessel is carrying 24,000 barrels of oil for discharge. The cargo hoses have an inside diameter of eight inches. The container around the loading manifold must hold __________.

 
 

38. In comparison to electric power, hydraulic power for jacking systems has the advantage of __________.

 
 

39. Prior to backloading portable tanks or drums onto an offshore supply vessel, check that each tank is __________.

 
 

40. When a wind force causes a floating MODU to heel to a static angle, the __________.

 
 

41. The natural rolling period of a drilling barge increases when __________.

 
 

42. A situation has occurred in which your vessel must be towed. When the towing vessel passes the towing line to you, you should secure the line __________.

 
 

43. You are hoisting a heavy lift with the jumbo boom. Your vessel displaces 8560 T. The 45-ton weight is on the pier and its center is 65' to starboard of the centerline. The head of the boom is 95' above the base line and the center of gravity of the lift when stowed on deck will be 55' above the base line. As the jumbo boom takes the strain the ship lists to 5.5°. What is the GM with the cargo stowed?

 
 

44. You are making a heavy lift with the jumbo boom. Your vessel displaces 8390 T. The 40 ton weight is on the pier and its center is 55' to starboard of the centerline. The head of the boom is 110' above the base line and the center of gravity of the lift when stowed on deck will be 45' above the base line. As the jumbo boom takes the strain the ship lists to 3.5°. What is the GM with the cargo stowed?

 
 

45. To check stability, a weight of 35 tons is lifted with the jumbo boom, whose head is 35 feet from the ship's centerline. The clinometer shows a list of 7.0° with the weight suspended. Displacement including the weight is 14,000 tons. What would the length of GM in this condition?

 
 

46. To check stability, a weight of 10 tons is lifted with the jumbo boom whose head is 45 ft. from the ship's centerline. The clinometer show's a list of 5.0° with weight suspended. Displacement including the weight is 9,000 tons. What would be the GM in this condition?

 
 

47. The period of roll is the time difference between __________.

 
 

48. Your vessel has a metacentric height of 1.12 feet and a beam of 60 feet. What will your average rolling period be?

 
 

49. Your vessel measures 114 feet long by 16 feet in beam. If the natural rolling period at a draft of 5'-06" is 6 seconds, what is the GM?

 
 

50. Your vessel measures 131 feet long by 20 feet in beam. If the natural rolling period at a draft of 8'-03" is 6 seconds, what is the GM?

 
 

51. You have approximately 6 tons of fish on deck. What will be the shift in the center of gravity after you shift the fish to the fish hold, a vertical distance of 7 feet? (total displacement is 422 tons)

 
 

52. You have approximately 15 tons of fish on deck. What will be the shift in the center of gravity after you shift the fish to the fish hold, a vertical distance of 8 feet? (total displacement is 300 tons)

 
 

53. Your vessel displaces 560 tons. The existing deck cargo has a center of gravity of 4.5 feet above the deck and weighs 34 tons. If you load 10 tons of ground tackle with an estimated center of gravity of 2.8 feet above the deck, what is the final height of the CG of the deck cargo?

 
 

54. A cargo of 30 tons is to be loaded on deck 30 feet from the ship's centerline. The ship's displacement including the 30 tons cargo will be 9,000 tons and the GM will be 5 feet. What would be the list of the vessel after loading this cargo?

 
 

55. What will happen when cargo is shifted from the main deck into the lower hold of a vessel?

 
 

56. The horizontal fore-and-aft movement of a vessel is called __________.

 
 

57. The horizontal port or starboard movement of a vessel is called __________.

 
 

58. The angular movement of a vessel about a horizontal line drawn from its bow to its stern is __________.

 
 

59. The vertical motion of a floating vessel is known as __________.

 
 

60. Rolling is angular motion of the vessel about what axis?

 
 

61. Pitching is angular motion of the vessel about what axis?

 
 

62. What is NOT a motion of the vessel?

 
 

63. The time required to incline from port to starboard and back to port again is called __________.

 
 

64. Addition of weight to a vessel will ALWAYS __________.

 
 

65. If your vessel is aground at the bow, it would be preferable that any weight removals be made from the __________.

 
 

66. Your vessel is damaged and is listing to port. The rolling period is short. There is sufficient freeboard so that deck edge submersion is not a problem. What corrective action should be taken FIRST in regard to the vessel's stability?

 
 

67. The stability which remains after a compartment is flooded is called __________.

 
 

68. You are fighting a fire in a watertight compartment using hoses and salt water. Stability may be reduced because of __________.

 
 

69. Jettisoning weight from topside __________.

 
 

70. Reserve buoyancy is the __________.

 
 

71. Where are the draft marks required to be displayed on a ship?

 
 

72. What is the center around which a vessel trims called?

 
 

73. Freeboard is measured from the upper edge of the __________.

 
 

74. In small-angle stability, when external forces exist, the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the __________.

 
 

75. A vessel behaves as if all of its weight is acting downward through the center of gravity, and all its support is acting upward through the __________.

 
 

76. Stability is determined principally by the location of the center of gravity and the __________.

 
 

77. Stability is determined principally by the location of the point of application of two forces: the upward-acting buoyant force and the __________.

 
 

78. The geometric center of the underwater volume of a floating vessel is the center of __________.

 
 

79. The center of flotation of a vessel is __________.

 
 

80. In the presence of external forces, the center of buoyancy of an inclined vessel is vertically aligned with the __________.

 
 

81. The center of flotation of a vessel is the geometric center of the __________.

 
 

82. When cargo is shifted from the lower hold to the main deck the __________.

 
 

83. Which action will best increase the transverse stability of a merchant vessel at sea?

 
 

84. GM cannot be used as an indicator of stability at all angles of inclination because __________.

 
 

85. Initial stability is indicated by __________.

 
 

86. A slow and easy motion of a vessel in a seaway is an indication of a __________.

 
 

87. Vessels "A" and "B" are identical; however, "A" is more tender than "B". This means that "A" relative to "B" has a __________.

 
 

88. A partially full tank causes a virtual rise in the height of the __________.

 
 

89. The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel's displacement into the __________.

 
 

90. Which will improve stability?

 
 

91. Topside icing decreases vessel stability because it increases __________.

 
 

92. At an angle of loll, the righting moment is __________.

 
 

93. The value of the righting arm at an angle of loll is __________.

 
 

94. A vessel is "listed" when it is __________

 
 

95. In the absence of external forces, adding weight on one side of a floating vessel causes the vessel to __________.

 
 

96. When a vessel is inclined by an external force, the __________

 
 

97. The difference between the starboard and port drafts caused by shifting a weight transversely is __________.

 
 

98. Assuming an even transverse distribution of weight in a vessel, which condition could cause a list?

 
 

99. If your vessel will list with equal readiness to either side, the list is most likely caused by __________.

 
 

100. A vessel has a strong wind on the port beam. This has the same effect on stability as __________.

 
 


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