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1. When the height of the metacenter is greater than the height of the center of gravity a vessel has which type of stability?
Stable
Negative
2. In small angle stability theory, the metacenter is located at the intersection of the inclined vertical centerline and a vertical line through __________.
B
G
3. Which formula can be used to calculate metacentric height?
KM - GM
KM - KG
4. When initial stability applies, the height of the center of gravity plus the metacentric height equals the __________.
corrected height of the center of gravity
height of the metacenter
5. A vessel with a large GM will __________.
be subject to severe racking stresses
be less likely to have cargo shift
6. With no environmental forces acting on the vessel, the center of gravity of an inclined vessel is vertically aligned with the __________.
metacenter
longitudinal centerline
7. 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 __________.
righting arm
righting moment
8. The ship's tanks most effective for trimming are the __________.
peaks
settlers
9. When a vessel's LCG is aft of her LCB, the vessel will __________
be on an even keel
trim by the stern
10. Longitudinal moment is obtained by multiplying a vessel's weight and its __________.
LCG
VCG or KG
11. 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 __________.
at the ends
amidships
12. A vessel's bottom will be subjected to tension when weight is concentrated __________.
amidships
forward
13. When a vessel is stationary and in a hogging condition, the main deck is under __________.
tension stress
shear stress
14. Your vessel has a midships engine room and the cargo is concentrated in the end holds. The vessel is __________.
hogging with tensile stress on main deck
hogging with compressive stress on main deck
15. What is not usually a concern when loading a single-hulled tanker?
Initial stability
Trim
16. 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?
4.8 inches
8.0 inches
17. 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"?
81.6 tons
64.3 tons
18. A tanker's mean draft is 32'-05". At this draft, the TPI is 178. The mean draft after loading 1200 tons will be __________.
33'-00"
33'-04"
19. 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?
100 tons
240 tons
20. 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.
FWD 15'-11 3/5", AFT 18'-11"
FWD 15'-04 3/4", AFT 18'-04"
21. 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.
FWD 18'-10.8", AFT 20'-10.4"
FWD 19'-00.4", AFT 20'-08.6"
22. 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.
170 tons each
155 tons each
23. 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.)
2920 tons
1550 tons
24. 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.
FWD 24'-06 1/2", AFT 25'-08 2/3"
FWD 24'-04 2/3", AFT 25'-10 3/4"
25. 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)
510 tons per hatch
530 tons per hatch
26. What should you be concerned with when loading and securing vehicles on a Ro-Ro?
Number, position and angle of lashes
Disconnecting the battery cables to prevent fire hazard
27. What is NOT required as special safety equipment on a tankship carrying hazardous cargoes in bulk?
Shower and eyewash fountain
Two portable vapor detectors suitable for the cargoes carried
28. What is NOT considered "jewelry"?
Buttons
Steamboat ratchets
29. What product is considered a noxious liquid substance for regulatory purposes?
Octanol
Cetyl-Eicosyl methacrylate
30. In towing, heaving lines are used for __________.
passing a messenger line
passing a tow bridle to the tug
31. One advantage of chain over wire rope for a tow bridle is that chain __________.
equalizes towing forces bette
resists damage from chafing
32. To reconnect a broken tow line, it is better to use a polypropylene messenger line because it __________
floats
is very supple
33. According to the regulations, what fire safety control feature is required in quick-closing shut off valves?
A fusible link
A water spray actuator
34. For the purposes of cargo oil containment, the fixed container under the manifold of an eight-inch loading line must hold a minimum of __________.
three barrels
four barrels
35. 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 __________.
four barrels
three barrels
36. In comparison to electric power, hydraulic power for jacking systems has the advantage of __________.
better control capabilities
less preload needed
37. Prior to backloading portable tanks or drums onto an offshore supply vessel, check that each tank is __________.
coated with non-corrosive protection
capped and checked for leaks
38. When a wind force causes a floating MODU 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
39. The natural rolling period of a drilling barge increases when __________.
ice accumulates above deck
free surfaces are reduced
40. 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 __________.
to the forward-most bitts
to the base of the foremast
41. 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?
3.74 ft.
3.96 ft.
42. 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?
4.58 feet
4.27 feet
43. 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?
0.95 foot
0.71 foot
44. 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?
0.57 foot
0.72 foot
45. The period of roll is the time difference between __________.
full inclination on one side to the next full inclination on the same side
full inclination on one side to full inclination on the other side
46. Your vessel has a metacentric height of 1.12 feet and a beam of 60 feet. What will your average rolling period be?
25 seconds
35 seconds
47. 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?
1.38 feet
1.53 feet
48. 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?
2.15 feet
1.93 feet
49. 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)
0.1 foot
0.9 foot
50. 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)
0.4 foot
0.1 foot
51. 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?
4.11 feet
4.36 feet
52. 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?
2.05°
1.14°
53. What will happen when cargo is shifted from the main deck into the lower hold of a vessel?
The GM will increase.
The center of buoyancy will move upward.
54. The horizontal fore-and-aft movement of a vessel is called __________.
surge
heave
55. The horizontal port or starboard movement of a vessel is called __________.
sway
yaw
56. The angular movement of a vessel about a horizontal line drawn from its bow to its stern is __________.
rolling
heaving
57. The vertical motion of a floating vessel is known as __________.
heave
sway
58. Rolling is angular motion of the vessel about what axis?
Longitudinal
Vertical
59. Pitching is angular motion of the vessel about what axis?
Transverse
Vertical
60. What is NOT a motion of the vessel?
Roll
Trim
61. The time required to incline from port to starboard and back to port again is called __________.
rolling period
range of stability
62. Addition of weight to a vessel will ALWAYS __________.
reduce reserve buoyancy
increase GM
63. If your vessel is aground at the bow, it would be preferable that any weight removals be made from the __________.
stern
bow
64. 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?
Shift any off-center weights from port to starboard
Press up any slack double-bottom tanks to eliminate free surface
65. The stability which remains after a compartment is flooded is called __________.
damage stability
initial stability
66. You are fighting a fire in a watertight compartment using hoses and salt water. Stability may be reduced because of __________.
increase in free surface which reduces the metacentric height
reduction of KG to the minimum allowable
67. Jettisoning weight from topside __________.
lowers the center of gravity
raises the center of buoyancy
68. Reserve buoyancy is the __________.
volume of intact space above the waterline
unoccupied space below the waterline
69. Where are the draft marks required to be displayed on a ship?
Area of water line near stem and stern
Deep tanks
70. What is the center around which a vessel trims called?
the center of gravity
the tipping center
71. Freeboard is measured from the upper edge of the __________.
deck line
gunwale bar
72. 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 __________.
metacenter
metacentric height
73. 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 __________.
keel
center of buoyancy
74. Stability is determined principally by the location of the center of gravity and the __________.
center of buoyancy
center of flotation
75. Stability is determined principally by the location of the point of application of two forces: the upward-acting buoyant force and the __________.
downward-acting weight force
environmental force
76. The geometric center of the underwater volume of a floating vessel is the center of __________.
hydrodynamic forces
buoyancy
77. The center of flotation of a vessel is __________.
the center of gravity of the water plane
the center of volume of the immersed portion of the vesse
78. In the presence of external forces, the center of buoyancy of an inclined vessel is vertically aligned with the __________.
center of flotation
metacenter
79. The center of flotation of a vessel is the geometric center of the __________.
waterplane area
above water volume
80. When cargo is shifted from the lower hold to the main deck the __________.
GM will increase
center of gravity will move upwards
81. Which action will best increase the transverse stability of a merchant vessel at sea?
Ballasting the double bottom tanks
Deballasting the deep tanks
82. GM cannot be used as an indicator of stability at all angles of inclination because __________.
M is not fixed at large angles
G is not fixed at large angles
83. Initial stability is indicated by __________.
GM
KM
84. A slow and easy motion of a vessel in a seaway is an indication of a __________.
small GM
stiff vessel
85. Vessels "A" and "B" are identical; however, "A" is more tender than "B". This means that "A" relative to "B" has a __________.
smaller GM
lower KG
86. A partially full tank causes a virtual rise in the height of the __________.
center of gravity
metacenter
87. The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel's displacement into the __________.
sum of the longitudinal free surface moments of the vessel
sum of the vertical moments of the vessel
88. Which will improve stability?
Pumping the bilges
Loading cargo on deck
89. Topside icing decreases vessel stability because it increases __________.
KG
draft
90. At an angle of loll, the righting moment is __________.
zero
negative
91. The value of the righting arm at an angle of loll is __________.
negative
equal to GM
92. A vessel is "listed" when it is __________
inclined due to an off-center weight
down by the head
93. In the absence of external forces, adding weight on one side of a floating vessel causes the vessel to __________.
heel until the angle of loll is reached
list until the center of buoyancy is aligned vertically with the center of gravity
94. When a vessel is inclined by an external force, the __________
vessel's center of buoyancy shifts to the center of the vessel's underwater hull
vessel's center of gravity shifts to the center of the vessel's underwater hull
95. The difference between the starboard and port drafts caused by shifting a weight transversely is __________.
list
heel
96. Assuming an even transverse distribution of weight in a vessel, which condition could cause a list?
Empty double-bottoms and lower holds, and a heavy deck cargo
Having KG smaller than KM
97. If your vessel will list with equal readiness to either side, the list is most likely caused by __________.
negative GM
excessive freeboard
98. A vessel has a strong wind on the port beam. This has the same effect on stability as __________.
increasing the trim
weight that is off-center to starboard
99. When a vessel is inclined at a small angle the center of buoyancy will __________.
move toward the low side
move toward the high side
100. Your vessel rolls slowly and sluggishly. This indicates that the vessel __________.
has poor stability
has a greater draft forward than aft
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