Ship Construction and Stability Final

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in small angles stability theory, the metacenter is located at the intersection of the inclined vertical centerline and a vertical line through

B

initial stability is indicated by

GM

subtracting KG from KM yields

GM

the difference between the height of the metacenter and the height of the center of gravity is

GM

what is used as an indicator of initial stability

GM

what abbreviation represents the height of the center of buoyancy

KB

subtracting GM from KM yields

KG

topside icing decreases stability because it increases

KG

for a given displacement, the righting arm has its maximum value when

KG is minimum

deballasting a double bottom has what affect on KG?

KG will increase

which formula can be used to calculate metacentric height

KM-KG

vertical moments are obtained by multiplying a vessel's weight and its

VCG or KG

buoyancy is a measure of a ship's

ability to float

initial stability of a vessel may be improved by

all of the above (: removing loose water, adding weight low in the vessel, closing crossover valves between partly filled double bottom tanks)

intact buoyancy is a term used to describe

an intact space below the surface of a flooded area

the center of buoyancy and the metacenter are in the line of action of the buoyant force

at all times

initial stability refers to stability

at small angles of inclination

which action will best increase the transverse stability of a merchant vessel at sea?

ballasting the double bottom tanks

if the metacentric height is small, a vessel will

be tender

the geometric center of the underwater volume of a floating vessel is the center of

buoyancy

the upward pressure of displaced water is called

buoyancy

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

buoyancy

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

center of buoyancy

stability is determined by the relationship of the center of gravity and the

center of buoyancy

stability is determined principally by the location of the center of gravity and the

center of buoyancy

the center of the underwater volume of a floating vessel is the

center of buoyancy

the center of volume of the immersed portion of the hull is called the

center of buoyancy

the geometric center of the underwater volume is known as the

center of buoyancy

a floating vessel will behave as if all its weight is acting downward through the

center of gravity

stability is determined principally by the location of two points in a vessel: the center of buoyancy and the

center of gravity

when cargo is shifted from lower hold to the main deck the

center of gravity will move upwards

if the vertical center of gravity (VCG) of a ship rises, the righting arm (GZ) for the various angles of inclination will

decrease

a vertical shift of weight to a position above the vessel's center of gravity will

decrease the righting moment

the purpose of the inclining experiment is to

determine the lightweight center of gravity location

a vessel's KG is determined by

dividing the total vertical moment summation by displacement

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

metacentric height is an indication of a vessel's stability

for small angles of inclination

which is an indication of reserve buoyancy

freeboard

in the absence of external forces, the center of gravity of a floating vessel is located directly above the

geometric center of the displaced volume

the center of buoyancy is located at the

geometric center of the displaced volume

your vessel rolls slowly and sluggishly. this indicates that the vessel

has poor stability

aboard a vessel, diving the sum of the vertical moments by the total weight yields the vessel's

height of the center of gravity

the difference between the height of the metacenter and the metacentric height is known as

height of the center of gravity

the important stability parameter, KG, is defined as the

height of the center of gravity above the keel

when a vessel is floating upright, the distance from the keel to the metacenter is called the

height of the metacenter

when initial stability applies,the height of the center of gravity plus the metacentric height equals the

height of the metacenter

which would NOT provide extra buoyancy for a vessel with no sheer?

higher bulwark

the waterplane area is described as the intersection of the surface of the water in which a vessel floats and the

hull

transverse stability calculations require the use of

hydrostatic curves

topside icing decreases vessel stability because it is usually off-center and

increases the height of the center of gravity

the vertical distance between G and M is used as a measure of

initial stability

what is not usually a concern when loading a single-hulled tanker

initial stability

metacentric height is a measure of

initial stability only

in small angle stability, the metacentric height

is calculated by subtracting KG from KM

which statement is TRUE about metacentric height

it is a measure of initial stability

a moment is obtained by multiplying a force by its

lever arm

the magnitude of a moment is the product of the force and the

lever arm

the purpose of the inclining experiment on a vessel is to determine the

location of the center of gravity of the light ship

the principal danger form ice collecting on a vessel is the

loss of stability

what will NOT decrease the stability of a vessel?

lowering a weight suspended by a boom onto the deck

you must shift a weight from the upper tween deck to the lower hold. this shift will

make the vessel stiffer

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

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

for a floating vessel, the result of subtracting KG from KM is the

metacentric height

the abbreviation GM is used to represent the

metacentric height

the important initial stability parameter, GM, is the

metacentric height

what is the stability term for the distance from the center of gravity (G) to the Metacenter (M), when the small-angle stability applies

metacentric height

which will be a result of removing on-deck containers

metacentric height will increase

the difference between the height of the metacenter and the height of the center of gravity is known as the

metacentric hieght

the result of multiplying a weight by a distance is a

moment

if a vessel lists to port, the center of buoyancy will

move to port

when a vessel is inclined at a small angle the center of buoyancy will

move toward the low side

a vessel with a small GM will

provide a comfortable ride for the crew and passengers

addition of weight above the center of gravity of a vessel will ALWAYS

reduce initial stability

addition of weight to a vessel will ALWAYS

reduce reserve buoyancy

the volume of a vessel's intact watertight space above the waterline is its

reserve buoyancy

the horizontal distance between the vertical lines of action of gravity and the buoyant forces is called the

righting arm

when a vessel has positive stability, the distance between the of force through B and line of force through G is called the

righting arm

when positive stability exists, GZ represents the

righting arm

the righting moment can be determined by multiplying the displacement by the

righting arm (GZ)

at all angles of inclination, the true measure of a vessel's stability is the

righting moment

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

righting moment

a slow and easy motion of a vessel in a seaway is an indication of a

small GM

the TCG(transverse center of gravity) of a vessel may be found by dividing the displacement of the vessel into the

sum of the transverse moments of the vessel

the KG of a vessel is found by dividing the displacement into the

sum of the vertical moments of the vessel

what will happen when cargo is shifted form the main deck into the lower hold of a vessel?

the GM will increase

what is the definition of transverse metacenter

the point to which G may rise and still permit the vessel to possess positive stability

the weight of a liquid displaced by a vessel floating in sea water is equal to the

total weight of the vessel

aboard a vessel, diving the sum of the transverse moments by the total weight yields the vessel's

transverse position of the center of gravity

reserve buoyancy is

transverse watertight bulkheads OR the watertight portion of a vessel above the waterline

the moment of a force is a measure of the

turning effect of the force about a point

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

a virtual rise in the center of gravity may be caused by

using an on board crane to lift a freely swinging heavy object

the value of the maximum righting arm depends on the position of the center of buoyancy and the

vertical location of the center of gravity

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)

vertical moment

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

vertical moments

at all angles of inclination, the metacenter is

vertically above the center of gravity

when a vessel is inclined by an external force, the

vessel's center of gravity shifts to the center of the vessel's underwater hull

reserve buoyancy is the

volume of intact space

the enclosed area defined as the intersection of the surface of the water and hull of a vessel is the

waterplane


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