Assessment Test

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1. A vessel is inclined at an angle of loll. In the absence of external forces, the righting arm (GZ) is __________.


2. A vessel has a maximum allowable draft of 28 feet in salt water and a fresh water allowance of 8 inches. At the loading berth, the water density is 1.011. To what draft can she load in order to be at her marks when she reaches the sea? (The salt water density is 1.025.)


3. A tanker loads at a terminal within the tropical zone. She will enter the summer zone five days after departing the loading port. She will burn off about 45 tons/day and daily water consumption is 8 tons. How many tons may she load over that allowed by her summer load line?


4. A tanker loads at a terminal within the tropical zone. She will enter the summer zone six days after departing the loading port. She will burn off 45 tons/day and daily water consumption is 8 tons. How many tons may she load over that allowed by her summer load line?


5. A vessel's tropical load line is 6 in. above her summer load line. Her TPI is 127 tons. She will arrive in the summer zone 8 days after departure. She will burn off about 47 tons/day fuel and water consumption is 12 tons/day. How many tons may she load above her summer load line if she loads in the tropical zone?


6. In order to calculate the TPI of a vessel, for any given draft, it is necessary to divide the area of the waterplane by __________.


7. A continual worsening of the list or trim indicates __________.


8. Your vessel is listing 4° to port and has a short rolling period. There is loose firefighting water in the hull. The ship is trimmed down by the head with one foot of freeboard at the bow. Which action should you take FIRST?


9. Your vessel is damaged, and there is no list or trim. The rolling period is short. The freeboard before the damage was 12'02" (3.7 meters). It is now reduced to 3'00"(1 meter). Which action would you take FIRST?


10. Your vessel is damaged and on an even keel. There is no trim. The freeboard is reduced to less than 1 foot. The rolling period is very long, and the vessel is sluggish in returning from a roll. Which action would you take FIRST to improve stability?


11. When flooding occurs in a damaged vessel, reserve buoyancy __________.


12. Your ship of 12,000 tons displacement has a center of gravity of 21.5 feet above the keel. You run aground and estimate the weight aground is 2500 tons. The virtual rise in the center of gravity is __________.


13. When the forward drafts and the after drafts are averaged, which of the following describes the result?


14. The wind has caused a difference between drafts starboard and port. This difference is known as which of the following?


15. What is the difference between the starboard and port drafts due to the wind or seas called?


16. One of the main purposes of the inclining experiment on a vessel is to determine the __________.


17. A floating vessel will behave as if all of its weight is acting downward through the __________.


18. The water in which a vessel floats provides vertical upward support. The point through which this support is assumed to act is known as the center of __________.


19. The upward pressure of displaced water is called __________.


20. The center of volume of the immersed portion of the hull is called the __________.


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


22. The center of flotation of a vessel is the point in the waterplane __________.


23. On a vessel, multiplying a load's weight by the distance of the load's center of gravity above the baseline results in a(n) __________.


24. The center of gravity of a freely swinging load suspended from a pedestal crane acts as if it were located at the __________.


25. Unstable equilibrium exists at small angles of inclination when __________.


26. Which statement is TRUE of a tender vessel?


27. When making a turn (course change) on most merchant ships, the vessel will heel outwards if __________.


28. If the result of loading a vessel is an increase in the height of the center of gravity, there will always be an increase in the __________.


29. A vessel's KG is determined by __________.


30. Which technique could be used to give a more comfortable roll to a stiff vessel?


31. Which of the following describes why topside icing, which is usually off-center, decreases vessel stability?


32. An upright vessel has negative GM. GM becomes positive at the angle of loll because the __________.


33. Your vessel is listing because of a negative GM. To lower G below M, you should __________.


34. The difference between the forward and aft drafts is __________.


35. Your vessel has just finished bunkering and has a small list due to improper distribution of the fuel oil. This list will cause __________.


36. Movement of liquid in a tank when a vessel inclines causes an increase in __________.


37. Stable equilibrium for a vessel means that the metacenter is __________.


38. For small angles of inclination, if the KG were equal to the KM, then the vessel would have __________.


39. The original equilibrium position is stable when __________.


40. At all angles of inclination, the metacenter is __________.


41. When a vessel is floating upright, the distance from the keel to the metacenter is called the __________.


42. Subtracting GM from KM yields __________.


43. The result of multiplying a weight by a distance is a __________.


44. Aboard a vessel, dividing the sum of the transverse moments by the total weight yields the vessel's __________.


45. For a given displacement, the righting arm has its maximum value when __________.


46. For a vessel inclined by the wind, multiplying the buoyant force by the horizontal distance between the lines of action of the buoyant and gravity forces gives the __________.


47. Initial stability of a vessel may be improved by __________.


48. Those ship's tanks that are particularly important for trimming the ship are the __________.


49. The "trimming arm" of a vessel is the horizontal distance between the __________.


50. The result of two forces acting in opposite directions and along parallel lines, is an example of what type of stress?


51. If a vessel is sagging, which kind of stress is placed on the sheer strake?


52. The normal tendency for a loaded tanker is to __________.


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