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单选题
The center of the underwater volume of a floating vessel is the（）.
A
center of buoyancy
B
center of flotation
C
uncorrected height of the center of gravity of the vessel
D
center of gravity of the vessel corrected for free surface effects
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考题
In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to ().A.heel until the angle of loll is reachedB.list until the center of buoyancy is aligned vertically with the center of gravityC.trim to the side opposite TCG until all moments are equalD.decrease draft at the center of flotation
考题
The center of volume of the immersed portion of the hull is called the ______.A.center of buoyancyB.center of floationC.center of gravityD.tipping center
考题
______ can be regarded as a vessel restricted in her ability to maneuver．A.Any aircraft designed to maneuver on the waterB.A vessel engaged in dredging，surveying or underwater operationsC.A vessel under sail provided that propelling machinery is not usedD.A small vessel sailing at night
考题
A ship lists and trims about the ______．A.Center of gravityB.Center of buoyancyC.Center of flotationD.Centroid of the underwater volume
考题
An upright vessel has negative GM．GM becomes positive at the angle of loll because the ______．A.Free surface effects are reduced due to pocketingB.KG is reduced as the vessel seeks the angle of lollC.Effective beam is increased causing BM to increaseD.Underwater volume of the hull is increased
考题
The free surface corrections depend upon the dimensions of the surface of the free liquids and the ______．A.volume of liquid in the tankB.displacement of the vesselC.location of the tank in the vesselD.height of the center of gravity of the vessel
考题
A floating vessel will behave as if all of its weight is acting downward through the ______.A.center of gravityB.center of buoyancyC.center of floationD.Metacenter
考题
At all angles of inclination, the metacenter is ______.A.vertically above the center of buoyancyB.vertically above the center of gravityC.at the intersection of the upright vertical centerline and the line of action of the buoyant forceD.at the geometric center of the underwater volume
考题
For a floating vessel, the center of buoyancy and the metacenter are in the line of action of the buoyant force ______.A.only when there is positive stabilityB.only when there is negative stabilityC.only when there is neutral stabilityD.at all times
考题
For a floating vessel, the center of flotation is the point in the waterplane ______.A.about which the vessel lists and trimsB.which coincides with the center of buoyancyC.which, in the absence of external forces, is always vertically aligned with the center of gravityD.which is shown in the hydrostatic tables as VCB
考题
For a floating vessel, the result of subtracting KG from KM is the ______.A.height of the metacenterB.height of the righting armC.height of the center of buoyancyD.metacentric height
考题
For a floating vessel, true mean draft is always the ______.A.average of the observed draftsB.draft at the center of flotationC.draft corresponding to the calculated displacementD.mean of the calculated drafts
考题
单选题The center of flotation of a vessel is（）.A
the center of volume of the immersed portion of the vesselB
the center of gravity of the water planeC
that point at which all the vertical downward forces of weight are considered to be concentratedD
that point at which all the vertical upward forces of buoyancy are considered to be concentrated
考题
单选题When a vessel is inclined by an external force，the（）.A
shape of the vessel's underwater hull remains the sameB
vessel's center of gravity shifts to the center of the vessel's underwater hullC
vessel's center of buoyancy shifts to the center of the vessel's underwater hullD
vessel's mean draft increases
考题
单选题A flooded lifeboat on board a vessel would adversely affect the vessel’s stabbility by（）.A
increasing the righting momentB
decreasing the vessel's displacementC
increasing the reserve buoyancyD
shifting the CG(center of gravity) off center
考题
单选题The center of buoyancy is located at the（）.A
geometric center of the waterplane areaB
intersection of the vertical centerline and line of action of the buoyant forceC
center of gravity of the vessel corrected for free surface effectsD
geometric center of the displaced volume
考题
单选题In the absence of external forces, the center of gravity of a floating vessel is located directly above the（）.A
metacenterB
amidshipsC
center of floatationD
geometric center of the displaced volume
考题
单选题Which vessel when anchored at night，would not be required to show anchor lights? （）A
A vessel engaged in underwater operationsB
A vessel engaged in mine clearanceC
A vessel engaged on pilotage dutyD
A vessel engaged in survey operations
考题
单选题A ship lists and trims about the（）.A
center of gravityB
center of buoyancyC
center of flotationD
centroid of the underwater volume
考题
单选题At all angles of inclination, the metacenter is（）.A
vertically above the center of buoyancyB
vertically above the center of gravityC
at the intersection of the upright vertical centerline and the line of action of the buoyant forceD
at the geometric center of the underwater volume
考题
单选题For a floating vessel，the result of subtracting KG from KM is the（）.A
height of the metacenterB
height of the righting armC
height of the center of buoyancyD
metacentric height
考题
单选题For a floating vessel, the center of buoyancy and the metacenter are in the line of action of the buoyant force（）.A
only when there is positive stabilityB
only when there is negative stabilityC
only when there is neutral stabilityD
at all times
考题
单选题For a floating vessel,true mean draft is always the（）.A
average of the observed draftsB
draft at the centre of flotationC
draft corresponding to the center of buoyancyD
metacentric height
考题
单选题In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to（）.A
heel until the angle of loll is reachedB
list until the center of buoyancy is aligned vertically with the center of gravityC
trim to the side opposite TCG until all moments are equalD
decrease draft at the center of flotation
考题
单选题For a floating vessel，the center of flotation is the point in the waterplane（）.A
about which the vessel lists and trimsB
which coincides with the center of buoyancyC
which，in the absence of external forces，is always vertically aligned with the center of gravityD
which is shown in the hydrostatic tables as VCB
考题
单选题For a floating vessel,the center of the floating is the point in the waterpiane.（）.A
aboat which the vessel lists and trimsB
which coincides with the center of buoyancyC
which, in the absence of external forces, is always vertically aligned with the center of gravityD
which is shown in the hydrostatic tables as VCB
考题
单选题For a floating vessel，true mean draft is always the（）.A
average of the observed draftsB
draft at the center of flotationC
draft corresponding to the calculated displacementD
mean of the calculated drafts
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