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1. The distance between the waterline of a vessel and the main deck is called __________.
freeboard
draft
2. A weight of 1,000 short tons is equivalent to __________.
2,000 kips
2,000 pounds
3. What abbreviation represents the height of the center of buoyancy?
KB
BM
4. Stability is determined principally by the location of two points in a vessel: the center of buoyancy and the __________.
center of flotation
center of gravity
5. Stability is determined principally by the location of the point of application of two forces: the downward-acting gravity force and the __________.
upward-acting buoyant force
environmental force
6. The geometric center of the underwater volume is known as the __________.
center of buoyancy
tipping center
7. The center of buoyancy is located at the __________.
geometric center of the displaced volume
center of gravity of the vessel corrected for free surface effects
8. In the absence of external forces, the center of buoyancy of an inclined vessel is vertically aligned directly below the __________.
center of gravity
center of flotation
9. The geometric center of the waterplane area is called the __________.
center of flotation
metacenter
10. In the absence of external forces, the center of gravity of a floating vessel is located directly in line with the __________.
geometric center of the displaced volume
amidships
11. Reducing free surfaces has the effect of lowering the __________.
virtual height of the center of gravity
metacentric height
12. Increasing free surfaces has the effect of raising the __________.
virtual height of the center of gravity
metacentric height
13. Addition of weight above the center of gravity of a vessel will ALWAYS __________.
increase GM
reduce initial stability
14. The center of buoyancy and the metacenter are in the line of action of the buoyant force __________.
at all times
only when there is positive stability
15. The vertical distance between G and M is used as a measure of __________.
initial stability
stability at angles less than the downflooding angle
16. When stability of a vessel is neutral, the value of GM __________.
is zero
only depends on the height of the center of gravity
17. The righting moment can be determined by multiplying the displacement by the __________.
longitudinal center of gravity (LCG)
righting arm (GZ)
18. A vessel with a small GM will __________.
have a large amplitude of roll
provide a comfortable ride for the crew and passengers
19. What is used as an indicator of initial stability?
GM
GZ
20. A vessel with a small GM will __________.
have a smaller amplitude of roll in heavy weather
be more subject to synchronous rolling
21. The important stability parameter, KG, is defined as the __________.
height of the center of gravity above the keel
metacentric height
22. A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed?
The tanks are partially filled with liquid cargo.
The tanks lie above the waterline and are filled.
23. The principal danger from ice collecting on a vessel is the _________.
loss of stability
decrease in capabilities of radar
24. Topside icing that blocks freeing ports and scuppers __________.
may decrease stability by increasing free surface effect due to water on deck
will cause water on deck to pocket and increase stability
25. The static stability curve for a given vessel peaks at 34°. For this ship, the danger angle for a permanent list would be about __________.
17°
8.5°
26. If the cause of severe list is off-center ballast, counterflooding into empty tanks will __________.
increase the righting moment
decrease list
27. At an angle of loll, the capsizing moment is __________.
zero
maximum
28. Before counterflooding to correct a list, you must be sure the list is due to which of the following choices?
off-center weight
flooding
29. At an angle of loll, the righting arm (GZ) is __________.
negative
maximum
30. During cargo operations, your vessel develops a list due to the center of gravity rising above the transverse metacenter. To correct the list, you should __________.
shift weight to the centerline
add weight in the lower holds or double bottoms
31. The original equilibrium position is always unstable when __________.
metacentric height is negative
KG exceeds maximum allowable limits
32. When the height of the metacenter is less than the height of the center of gravity of a vessel, the upright equilibrium position is __________.
positive
unstable
33. The point to which your vessel's center of gravity (G) may rise and still permit the vessel to have positive stability is called the __________.
metacenter
tipping center
34. What is the definition of transverse metacenter?
The point to which G may rise and still permit the vessel to possess positive stability.
The distance between the actual center of gravity and the maximum center of gravity that will still allow a positive stability.
35. What is the stability term for the distance from the center of gravity (G) to the Metacenter (M), when small-angle stability applies?
metacentric height
metacentric radius
36. The difference between the height of the metacenter and the height of the center of gravity is __________.
GM
KB
37. The horizontal distance between the vertical lines of action of gravity and the buoyant forces is called the __________
righting arm
metacentric height
38. Subtracting KG from KM yields __________.
GM
BM
39. For a floating vessel, the result of subtracting KG from KM is the __________.
metacentric height
height of the center of buoyancy
40. If the metacentric height is small, a vessel will __________
be tender
have a quick and rapid motion
41. When the height of the metacenter is the same as the height of the center of gravity, the metacentric height is equal to __________
zero
half the height of the metecenter
42. The moment created by a force of 12,000 tons and a moment arm of 0.25 foot is __________.
3,000 ft-tons
0 ft-tons
43. A moment of 300 ft-tons is created by a force of 15,000 tons. What is the moment arm?
0.02 foot
25.00 feet
44. Aboard a vessel, multiplying a load's weight by the distance of the load's center of gravity from the centerline results in the load's __________.
transverse moment
TCG
45. When a wind force causes a vessel to heel to a static angle, the __________.
righting moment equals the wind-heeling moment
centers of buoyancy and gravity are in the same vertical line
46. When positive stability exists, GZ represents the __________.
righting arm
metacentric height
47. The amount of freeboard which a ship possesses has a tremendous effect on its __________.
stability at large angles of inclination
permeability
48. The change in trim of a vessel may be found by __________.
dividing the trim moments by MT1
looking at the Hydrostatic Properties Table for the draft of the vessel
49. Which would NOT provide extra buoyancy for a vessel with no sheer?
Higher bulwark
Lighter draft
50. The two points that act together to trim a ship are the __________.
LCG and LCB
LCF and LCB
51. A vessel trimmed by the stern has a __________.
drag
set
52. The shearing stresses on a ship's structure are usually greatest at __________.
the ship's quarter-length points
the bow
53. Which is the MOST important consideration for a tank vessel?
The stress on the hull
The vertical center of gravity
54. Your vessel has a forward draft of 26'-11" and an after draft of 29'-07". How many tons of cargo can be loaded before the vessel reaches a mean draft of 28'-06" if the TPI is 69?
207 tons
204 tons
55. A bulk freighter 580 ft. in length, 60 ft. beam, with a waterplane coefficient of .84 is floating in salt water at a draft of 21 ft. How many long tons would it take to increase the mean draft 1"?
69.6
65.1
56. Your vessel's draft is 24'-06" forward and aft. 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?
240 tons
120 tons
57. Using the Guidance Manual for Loading the M.V. Grand Haven, determine the amount of ballast required in tank No. 3 (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 34 lbs.
1220 tons each
1150 tons each
58. Your vessel's existing draft is FWD 25'-04", AFT 24'-08". Using the Guidance Manual for Loading M.V. GRAND HAVEN, determine the new draft if 634 long tons are discharged from NO. 19 hatch.
FWD 25'-05 1/4", AFT 23'-08 5/8"
FWD 25'-00 1/4", AFT 25'-04 1/8"
59. Your vessel's existing draft is FWD 17'-03", AFT 18'-09". Using the Guidance Manual for Loading M.V. Grand Haven, determine the new draft if 450 long tons are loaded in No. 16 hatch.
FWD 17'-04", AFT 19'-03 3/4"
FWD 16'-11", AFT 19'-04 2/3"
60. A six-strand composite rope made up of alternate fiber and wire strands around a fiber core is called __________.
spring lay
alternate lay
61. The safe working load (SWL) of wire rope with a safety factor of 6 is what percent of its strength?
17%
10%
62. The best method to secure a tow line to a cleat is to __________.
take a turn around the cleat, then figure-eights, and a half-hitch
take a turn, a half turn, and a figure-eight
63. Keeping the draft at or below the load line mark will insure that the vessel has adequate __________.
ballast
reserve buoyancy
64. You would NOT secure a line to a __________
timber head
stand pipe
65. When paying out nylon line from around the bitts __________.
stand clear of the bitts and use two or more round turns under your figure eights
you can surge the line even with a single turn
66. A chain bridle is used when towing astern because it __________
provides an effective catenary and absorbs shock due to its weight
makes rigging a swivel unnecessary
67. What is used to prevent wear on towlines that bear on hard surfaces?
Chafing gear
Chocks
68. According to U.S. regulations what is the maximum allowable working pressure (MAWP) for each hose assembly used for transferring oil?
more than the sum of the pressure of the relief valve setting
at least 600 psi (4.14 MPa)
69. Who may serve as the "person in charge" of loading and discharge operations aboard a tankship?
The bosun
A credentialed officer who holds a tankerman-PIC endorsement
70. When loading or discharging dry mud or cement, crew members should use goggles and __________.
facial respirator mask
fireman's outfit
71. For a MODU with trim, a decrease in GMT will cause the angle of inclination to __________.
increase
remain constant
72. A MODU lists and trims about the __________.
center of flotation
center of gravity
73. The height of the metacenter above the keel will vary depending on the __________.
draft and beam of the drilling unit
buoyancy and trim of the drilling unit
74. On a semisubmersible drilling unit, increasing riser tension reduces __________.
GM
KG
75. What is the displacement of a barge which measures 85' x 46' x 13' and is floating in salt water with a draft of ten feet?
1117 tons
17.5 tons
76. You are making a heavy lift with the jumbo boom. Your vessel displaces 7940 T. The 45-ton weight is on the pier and its center is 60' 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 50' above the base line. As the jumbo boom takes the strain the ship lists to 4.5°. What is the GM with the cargo stowed?
4.64
4.82
77. You are on a vessel that has a metacentric height of 4 feet, and a beam of 50 feet. What can you expect the rolling period of the vessel to be?
11.0 seconds
11.5 seconds
78. You are on a vessel that has a metacentric height of 1.0 foot and a beam of 40 feet. What can you expect the rolling period of the vessel to be?
15.2 seconds
17.6 seconds
79. You are at sea on a vessel that has a beam of 50 feet, and you calculate the period of roll to be 22 seconds. What is the vessel's metacentric height?
1.0 ft
0.8 ft
80. Your vessel measures 126 feet (38.41 meters) long by 21 feet (6.4 meters) in beam. If the natural rolling period at a draft of 8 feet (2.44 meters) is 6 seconds, what is the GM?
2.4 feet (0.70 meters)
3.0 feet (0.90 meters)
81. Your vessel's has a beam of 60 feet, and you observe a still water rolling period of 25 seconds. What is the vessel's metacentric height?
1.1 ft
0.8 ft
82. Your vessel has a displacement of 24,500 tons. It is 529 feet long and has a beam of 71 feet. You have timed your vessel's rolling period to be 25.0 seconds. What is your vessel's approximate GM?
1.56 feet
1.25 feet
83. Your vessel measures 128 feet long by 21 feet in beam. If the natural rolling period at a draft of 7'-06" is 6 seconds, what is the GM?
2.37 feet
1.56 feet
84. You have approximately 60 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 960 tons)
0.5 foot
0.6 foot
85. You have approximately 14 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 6 feet? (total displacement is 210 tons)
0.2 foot
0.4 foot
86. Your vessel displaces 564 tons. The existing deck cargo has a center of gravity of 1.5 feet above the deck and weighs 41 tons. If you load 22 tons of ground tackle with an estimated center of gravity of 2.5 feet above the deck, what is the final height of the CG of the deck cargo?
1.85 feet
1.62 feet
87. Your vessel displaces 497 tons. The existing deck cargo has a center of gravity of 2.5 feet above the deck and weighs 24 tons. If you load 18 tons of ground tackle with an estimated center of gravity of 18 inches above the deck, what is the final height of the CG of the deck cargo?
2.07 feet
1.86 feet
88. A cargo of 100 tons is to be loaded on deck 20 feet from the ship's centerline. The ship's displacement including the 100 tons of cargo will be 10,000 tons and the GM two feet. What would be the list of the vessel after loading the cargo?
5.7°
5.4°
89. A cargo of 60 tons is to be loaded on deck 20 feet from the ship's centerline. The vessel's displacement including the 60 ton cargo will be 6,000 tons and the GM two feet. What would be the list of the vessel after loading this cargo?
5.72°
5.4°
90. You are fighting a fire in a cargo hold on your vessel. Which action is most important concerning the stability of the vessel?
Draining fire-fighting water and pumping it overboard
Removing burned debris from the cargo hold
91. Your vessel has been in a collision. After assessing the damage, you begin down flooding. This will cause the KB to do what?
Rise
Remain stationary
92. A vessel is described as a two compartment vessel when it __________.
has two compartments in addition to the engine room
will float if any two adjacent compartments are flooded
93. Your vessel is damaged, listing to port and on occasion flopping to the same angle to starboard. It has a long, slow, sluggish roll around the angle of list. There is excessive trim by the stern with little freeboard aft. What action should you take FIRST to correct this situation?
Press up any slack double-bottom tanks forward of the tipping center, then fill the forepeak if empty.
Pump out the after peak and fill the forepeak to change the trim.
94. Your vessel is damaged and partially flooded. It is listing 12° to port and trimmed 8 feet down by the head. It has a long, slow, sluggish roll. Which action should you take FIRST?
Press up an after, slack, centerline double bottom tank
Pump out the forepeak tank
95. Your vessel is damaged and listing to port. The rolling period is long, and the vessel will occasionally assume a starboard list. Which action should you take FIRST?
Press up a slack centerline double bottom tank
Transfer all possible movable weights from port to starboard
96. Your vessel was damaged and initially assumed a significant list and trim; however, further increase has been slow. Based on this data, what should you expect?
The vessel can probably be saved if further flooding can be stopped.
The vessel will suddenly flop to the same or greater angle of list on the other side and may capsize.
97. What is the maximum mean draft to which a vessel may be safely loaded called?
deep draft
load line draft
98. For an upright vessel, draft is the vertical distance between the keel and the __________.
amidships section
waterline
99. What is the distance between the bottom of the hull and the waterline called?
draft
freeboard
100. What is the weight of the liquid displaced by a vessel floating in sea water equal to?
total weight of the vessel
reserve buoyancy
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