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1. The effects of free surface on initial stability depend upon the dimensions of the surface of the free liquids and the __________.
volume of displacement of the vessel
height of the center of gravity of the vessel
2. Which statement about free surface is TRUE?
Pocketing occurs at small angles of inclination when a tank is 98% full.
A partially filled space with 40% surface permeability will have greater free surface effect than one with 60% surface permeability.
3. To calculate the free surface correction, it is necessary to divide the free-surface moments by the __________.
total displacement
lightweight
4. Increasing the number of slack liquid tanks has the effect of raising the __________
virtual height of the center of gravity
metacentric height
5. When displacement increases, the free surface moments of slack tanks __________.
remain unchanged
decrease
6. Before loading bulk grain, bilge wells must be covered to __________.
prevent cargo sifting into the bilge wells
permit rapid flow of water to the bilge wells
7. On a vessel of 6500 tons displacement, a tank 30 ft. long, 32 ft. wide and 15 ft. deep is half filled with oil cargo (S.G. 0.948) while the vessel is floating in saltwater (S.G. 1.026). What is the free surface constant for this tank?
2162
1336
8. On a vessel of 6500 tons displacement, a tank 35 ft. long, 25 ft. wide, and 8 ft. deep is half filled with liquid cargo (S.G. 1.053) while the vessel is floating in saltwater (S.G. 1.026). What is the free surface constant for this tank?
1371
1336
9. Your vessel displaces 968 tons and measures 158'L x 40'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 65'L x 40'B and the weight of the water is 80 tons?
9.45 feet
9.14 feet
10. On a vessel of 10,000 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water on the tank top. The hold is 40 feet long and 50 feet wide. What is the reduction in metacentric height?
1.2 feet
1.1 feet
11. What is the reduction in metacentric height due to free surface when a tank 60 ft. wide and 60 ft. long is partially filled with saltwater? (The vessel's displacement is 10,000 tons.)
3.09 feet
3.00 feet
12. A vessel carries three slack tanks of gasoline (SG .68). The vessel's displacement is 8,000 tons. Each tank is 50 ft. long and 20 ft. wide. What is the reduction in GM due to free surface with the vessel floating in sea water (SG 1.026)?
.24 feet
.20 feet
13. A shaft alley divides a vessel's cargo hold into two tanks, each 20 ft. wide by 60 ft. long. Each tank is filled with saltwater below the level of the shaft alley. The vessel's displacement is 7,000 tons. What is the reduction in GM due to free surface effect?
.33 feet
.29 feet
14. On a vessel of 6,000 tons displacement there are two slack tanks of carbon tetrachloride (SG 1.6). Each tank is 40 feet long and 25 feet wide. What is the reduction in metacentric height due to free surface with the vessel in sea water (SG 1.025)?
.39 ft
.77 ft
15. On a vessel of 9,000 tons displacement there are two slack deep tanks of palm oil (SG .86). Each tank is 40 feet long and 30 feet wide. What is the reduction in metacentric height due to free surface with the vessel in sea water (SG 1.025)?
.48 ft
.27 ft
16. Your vessel displaces 728 tons and measures 138'L by 31'B. What is the reduction in GM due to free surface if the fish hold (36'L by 29'B by 9'D) is filled with 3.6 feet of water? (Each foot of water weighs 29.8 tons)
2.35 feet
2.50 feet
17. Your vessel displaces 930 tons and measures 156'L by 38'B. What is the reduction in GM due to free surface if the fish hold (46'L by 28'B by 8'D) is filled with 1.5 feet of water? (Each foot of water weighs 36.8 tons)
2.44 feet
2.16 feet
18. The liquid mud tanks on your vessel measure 24'L by 16'B by 8'D. The vessel's displacement in fresh water is 864 tons and the specific gravity of the mud is 1.47. What is the reduction in GM due to 2 of these tanks being slack?
.80 foot
.32 foot
19. The liquid mud tanks on your vessel measure 24'L by 16'B by 8'D. The vessel's displacement in salt water (specific gravity 1.025) is 864 T and the specific gravity of the mud is 1.47. What is the reduction in GM due to 2 of these tanks being slack?
0.78 foot
0.32 foot
20. The liquid mud tanks on your vessel measure 18'L by 10'B by 6'D. The vessel's displacement is 944 T and the specific gravity of the mud is 1.9. What is the reduction in GM due to 2 of the tanks being slack?
.16 foot
.08 foot
21. You must shore up the collision bulkhead due to solid flooding forward. The bulkhead approximates an inverted triangle. The center of pressure of the shores on the bulkhead should be located _________.
evenly over the surface of the bulkhead
approximately halfway up the bulkhead
22. Strengthening damaged bulkheads by using wood or steel is called __________.
shoring
battening
23. Control of flooding should be addressed __________.
following control of fire
first
24. When patching holes in the hull, pillows, bedding, and other soft materials can be used as __________.
strongbacks
gaskets
25. The greatest effect on stability occurs from loose liquids flowing __________.
in and out of a vessel that is holed in a wing tank
in and out of a vessel that is holed in a peak tank
26. Many vessels are provided with flume tanks, which also have a dump tank located under the flume tanks. In the event the ship is damaged, you could dump the flume tanks into the dump tank which would __________.
reduce the free surface effect and lower the KG
reduce the free surface effect and raise the KG
27. To increase the extent of flooding your vessel can suffer without sinking, you could __________.
increase reserve buoyancy
lower the center of gravity
28. A virtual rise in the center of gravity may be caused by __________.
filling a partially filled tank
using an on board crane to lift a freely swinging heavy object
29. The free surface correction depends upon the dimensions of the surface of the free liquid and the __________.
displacement of the vessel
volume of liquid in the tank
30. Which statement about the free surface correction is TRUE?
It is increased if the slack tank is not on the centerline.
The correction decreases as the draft increases due to loading dry cargo.
31. When displacement increases, the free surface corrections for slack tanks __________.
decrease
remain unchanged
32. Your 40-foot auxiliary sailing vessel has just run aground on a bar. She has a relatively long, deep keel and the tide is falling. You have checked the bilges for damage and found none. Which is the most prudent action to take immediately?
Strike the sails. Then run a kedge anchor out to one side, hook the main halyard to it, and heave the boat down onto one side.
Take soundings visually, by sounding pole, or lead line all around the vessel to locate the deepest water.
33. A claim for cargo damages may be held against the ship owner if such damage is the result of failure of the ship's officers to __________.
ensure the fitness and safety of cargo spaces
correct all defects in the ship's construction
34. Determine the free surface constant for a fuel oil tank 30 ft. long by 40 ft. wide by 15 ft. deep. The specific gravity of the fuel oil is .85 and the ship is floating in saltwater (S.G. 1.026).
3787
0.83
35. On a vessel of 7000 tons displacement, a tank 35 ft. long, 30 ft. wide and 46 ft. deep is half filled with liquid cargo (S.G. 0.923) while the vessel is floating in saltwater (S.G. 1.026). What is the free surface constant for this tank?
2731
2024
36. On a vessel of 6500 tons displacement, a tank 30 ft. long, 32 ft. wide and 18 ft. deep is half filled with liquid cargo (S.G. 1.048) while the vessel is floating in saltwater (S.G. 1.026). What is the free surface constant for this tank?
2390
1152
37. On a vessel of 9,000 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water on the tank tops. The hold is 20 feet long and 30 feet wide. What is the reduction in metacentric height?
.14 feet
.09 feet
38. A cargo vessel of 9,000 tons displacement is carrying a slack deep tank of molasses (SG 1.4). The tank measures 20 feet long and 30 feet wide. What will be the reduction in metacentric height due to free surface, with the vessel floating in sea water (SG 1.026)?
.142 ft.
.195 ft.
39. Your vessel displaces 747 tons and measures 136'L by 34'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 56'L x 34'B and the weight of the water is 58.6 tons?
6.51 feet
6.04 feet
40. Your vessel displaces 368 tons and measures 96'L x 28'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 42'L x 28'B and the weight of the water is 36 tons?
5.43 feet
4.98 feet
41. A 7,000 ton displacement tankship carries two slack tanks of alcohol with a S.G. of 0.8. Each tank is 50 ft. long and 30 ft. wide. What is the reduction in GM due to free surface with the vessel floating in sea water, S.G. is 1.026?
.72 ft
.36 ft
42. A shaft alley divides a vessel's cargo hold into two tanks, each 25 ft. wide by 50 ft. long. Each tank is filled with salt water below the level of the shaft alley. The vessel's displacement is 6,000 tons. What is the reduction in GM due to free surface effect?
.62 foot
.56 foot
43. On a vessel of 5,000 tons displacement there are two slack tanks of acid (SG 1.8). Each tank is 30 feet long and 20 feet wide. What is the reduction in metacentric height due to free surface with the vessel in sea water (SG 1.025)?
.11 ft
.40 ft
44. Your vessel displaces 750 tons and measures 151'L by 35'B. What is the reduction in GM due to free surface if the fish hold (60'L by 31'B by 10'D) is filled with 3.5 feet of water? (Each foot of water weighs 53.1 tons)
4.55 feet
4.14 feet
45. Your vessel displaces 684 tons and measures 132'L by 31'B. What is the reduction in GM due to free surface if the fish hold (32'L by 29'B by 9'D) is filled with 2 feet of water? (Each foot of water weighs 26.5 tons)
2.52 feet
2.17 feet
46. The liquid mud tanks on your vessel measure 22'L by 16'B by 7'D. The vessel's displacement is 568 T and the specific gravity of the mud is 1.6. What is the reduction in GM due to 2 of these tanks being slack?
1.18 feet
0.56 foot
47. The liquid mud tanks on your vessel measure 32'L by 15'B by 8'D. The vessel's displacement is 640 tons and the specific gravity of the mud is 1.8. What is the reduction in GM due to 2 of these tanks being slack?
1.41 feet
0.74 foot
48. The liquid mud tanks on your vessel measure 20'L by 18'B by 7'D. The vessel's displacement is 986 T and the specific gravity of the mud is 1.6. What is the reduction in GM due to 2 of these tanks being slack?
.09 foot
.88 foot
49. You must shore up a bulkhead due to solid flooding forward. The bulkhead approximates a rectangle. The center of pressure of the shores on the bulkhead should be located _________.
approximately one-third of the way up the bulkhead
approximately halfway up the bulkhead
50. Progressive flooding is controlled by securing watertight boundaries and __________.
pumping out flooded compartments
abandoning ship
51. Free communication will adversely affect transverse stability only when the flooded space is __________.
off-center
completely flooded
52. During counterflooding to correct a severe list aggravated by an off-center load, your vessel suddenly takes a list to the opposite side. You should __________.
immediately stop counterflooding
continue counterflooding in the same direction
53. Your vessel has been holed in #1 hold and partially flooded. The hole is plugged against further flooding. In calculating the effect of the flooding on your transverse stability, you should use which method?
Added weight method
Compartment standard method
54. The free surface effects of a partially full liquid tank decrease with increased __________.
displacement volume of the vessel
placement of the tank above the keel
55. The free surface effects of a partially full tank in a vessel increase with the __________.
surface area of the fluid in the tank
displacement volume of the vessel
56. The most important figure in calculating the free surface constant of a tank carrying liquids is __________.
breadth
length
57. The effect of free surface on initial stability depends upon __________.
the dimensions of the liquid surface and the vessel's displacement
the vertical position of the liquid in the vessel
58. A tank which is NOT completely full or empty is called __________.
slack
elemental
59. A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis, how will the value of the moment of inertia of the free surface be affected?
The moment of inertia would be 1/2 the original value.
The moment of inertia would be 1/4 its original value.
60. Bilge soundings indicate __________.
All of the above
whether the vessel is taking on water
the amount of condensation in the hold
whether the cargo is leaking or not
61. On a vessel of 34,000 tons displacement, a tank 80 ft. long, 60 ft. wide and 30 ft. deep is half filled with fresh water (SG 1.000) while the vessel is floating in saltwater (SG 1.026). What is the free surface constant for this tank?
40100
2819
62. On a vessel of 12,500 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water on the tank top. The hold is 35 feet long and 50 feet wide. What is the reduction in metacentric height?
.83 ft
.14 ft
63. (3.7.5.3-7) Your vessel displaces 840 tons and measures 146'L x 38'B. You ship a large wave on the after deck. What is the reduction in GM due to free surface before the water drains overboard, if the after deck measures 65'L x 38'B and the weight of the water is 76 tons?
D. 9.27 feet
A. 8.76 feet
64. Your vessel displaces 477 tons and measures 116'L x 31'B. You ship a large wave on the after deck. What is the reduction in GM due to free surface before the water drains overboard, if the after deck measures 54'L x 31'B and the weight of the water is 51.5 tons?
7.25 feet
6.43 feet
65. Your vessel displaces 689 tons and measures 123'L x 31'B. You ship a large wave on the after deck which measures 65'Lx 31'B. The weight of the water is estimated at 62 tons. What is the reduction in GM due to free surface before the water drains overboard?
6.14 feet
5.51 feet
66. On a vessel of 15,000 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water in the tank tops. The hold is 50 feet long and 60 feet wide. What is the reduction in metacentric height?
1.71 feet
1.54 feet
67. On a vessel of 12,000 tons displacement, a tank 60 feet long, 50 feet wide, and 20 feet deep is half filled with fresh water (SG 1.000) while the vessel is floating in saltwater (SG 1.026) What is the reduction in metacentric height due to free surface?
1.44 ft.
0.97 ft.
68. On a vessel of 10,000 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water on tank tops. The hold is 50 feet long and 50 feet wide. What is the reduction in metacentric height?
1.5 feet
1.2 feet
69. On a vessel of 12,000 tons displacement, what is the reduction in metacentric height due to free surface when a tank 60 feet long and 60 feet wide is partially filled with water?
2.57 feet
2.30 feet
70. Your vessel displaces 696 tons and measures 135'L by 34'B. What is the reduction in GM due to free surface if the fish hold (32'L by 29'B by 9'D) is filled with 2.0 feet of water? (Each foot of water weighs 26.5 tons)
2.48 feet
1.96 feet
71. Your vessel displaces 740 tons and measures 141'L by 34'B. What is the reduction in GM due to free surface if the fish hold (41'L by 30'B by 9'D) is filled with 2.5 feet of water? (Each foot of water weighs 35.1 tons)
3.18 feet
2.14 feet
72. The liquid mud tanks on your vessel measure 40'L by 20'B by 8'D. The vessel's displacement is 996 T and the specific gravity of the mud is 1.7. What is the reduction in GM due to 2 of these tanks being slack?
2.54 feet
0.95 foot
73. The liquid mud tanks on your vessel measure 30'L by 15'B by 6'D. The vessel's displacement is 968 T and the specific gravity of the mud is 1.8. What is the reduction in GM due to 2 of these tanks being slack?
.87 foot
.19 foot
74. (3.7.5.3B-9) The liquid mud tanks on your vessel measure 20'L by 18'B by 7'D. The vessel's displacement is 866 T and the specific gravity of the mud is 1.8. What is the reduction in GM due to 2 of these tanks being slack?
D. 1.12 feet
A. 0.24 foot
75. Small hull leaks can be temporarily repaired by __________.
parceling
caulking
76. A Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this, you should __________.
install shoring so the shoring supports the damaged bulkheads without pushing on them
use jacks or chain falls to remove the set before installing shores
77. The BEST information on the nature and extent of damage to the vessel is obtained from __________.
personnel at the scene of the damage
the bridge watch
78. A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from __________.
collapsing
filling completely
79. The two factors which make underwater hull repair difficult are accessibility and the __________.
pressure exerted by the water
threat of progressive flooding
80. When plugging holes below the waterline you should __________.
reduce the entry of water as much as possible
eliminate all water entering the hole
81. In plugging submerged holes; rags, wedges, and other materials should be used in conjunction with plugs to __________.
reduce the water leaking around the plugs
reduce the water pressure on the hull
82. Which statement concerning sweat damage in containers is TRUE?
Containers should be ventilated, dehumidified, or the contents physically protected against sweat damage.
Sweat damage is not a problem except in insulated and refrigerated containers
83. What would have the greatest affect on a vessel's longitudinal strength?
Collision damage to the bow, forward of the collision bulkhead
Grounding damage to the bilge strake, just aft of midships
84. Which spaces are required to be segregated from cargo tanks carrying grades A, B, C, or D cargoes?
Navigation spaces
Cofferdams
85. On a vessel of 7000 tons displacement, a tank 35 ft. long, 30 ft. wide and 4 ft. deep is half filled with fuel oil (S.G. 0.962) while the vessel is floating in saltwater (S.G. 1.026). What is the free surface constant for this tank?
2109
25974
86. What is the reduction in metacentric height due to free surface when a tank 60 feet long and 30 feet wide is partially filled with salt water, and is fitted with a centerline bulkhead? (The vessel has a displacement of 10,000 tons.)
0.1 foot
0.8 foot
87. A vessel has a cargo hold divided by a shaft alley into two tanks, each 35 feet long and 20 feet wide. Each tank is half filled with sea water. The vessel displaces 5,000 tons. What is the reduction in GM due to free surface effect?
.27 foot
.30 foot
88. Your vessel displaces 562 tons and measures 121'L x 29'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 46'L x 29'B and the weight of the water is 41 tons?
4.43 feet
4.61 feet
89. Your vessel displaces 869 tons and measures 136'L x33'B. You ship a large wave on the after deck which measures 52'Lx 33'B. The weight of the water is estimated at 52.8 tons. What is the reduction in GM due to free surface before the water drains overboard?
4.83 feet
5.12 feet
90. On a vessel displacing 8,000 tons, what is the reduction in metacentric height due to free surface when a tank 45 feet long and 45 feet wide is partly filled with salt water?
1.22 feet
1.16 feet
91. On a vessel of 8,000 tons displacement, compute the reduction in metacentric height due to free surface in a hold having free water in the tank tops. The hold is 40 feet long and 20 feet wide. What is the reduction in metacentric height?
0.1 ft
0.3 ft
92. Your vessel displaces 645 tons and measures 132'L by 34'B. What is the reduction in GM due to free surface if the fish hold (30'L by 26'B by 8'D) is filled with 3.0 feet of water? (Each foot of water weighs 22.3 tons)
1.94 feet
1.76 feet
93. Your vessel displaces 585 tons and measures 128'L by 26'B. What is the reduction in GM due to free surface if the fish hold (30'L by 18'B by 9'D) is filled with 2.8 feet of water? (Each foot of water weighs 15.4 tons)
0.66 foot
1.12 feet
94. Progressive flooding may be indicated by __________.
ballast control alarms
a continual worsening of list or trim
95. After an explosion, repair of emergency machinery and services should be accomplished __________.
after control of fire, flooding, and structural repairs
immediately, before the emergency is under control
96. The wooden plug inserted in the vent of a damaged tank should be removed if you are going to __________.
pump from the damaged tank
fight a fire
97. Your vessel has grounded on a bar. What should you do?
Switch to the high suction for condenser circulating water, if it is submerged.
If you cannot get clear immediately, lighten the ship by pumping all ballast overboard.
98. The wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from __________.
filling completely
developing free surfaces
99. The percentage of the total surface area or volume of a flooded compartment that can be occupied by water caused by damage is known as __________.
permeability
form gain
100. You are on the SS American Mariner and involved in a collision. Your draft has increased uniformly and there is about 4 feet of freeboard remaining. The vessel is on an even keel and has a long rolling period. The roll is sluggish, and the vessel hangs at the ends of a roll. Which of the following actions would you take First to correct the situation?
Pump out flooding water in the cargo holds to reduce free surface.
Pump out a slack double bottom tank to reduce free surface.
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