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WorksheetsLESSON 2B
Total questions: 12
Worksheet time: 6mins
The term “stability” Usually refers to:
the ability of a vessel to maintain an upright position when being acted upon by external forces.
the ability of a vessel to return to an upright position after being heeled by an external force.
the ability of a vessel to be loaded to her maximum capacity and maintain seaworthiness.
the ability of a vessel to resist the actions created by external forces.
Longitudinal stability refers to:
the trim and pitching of a vessel.
the side to side rolling of a vessel.
isochronous rolling.
hogging and sagging
The perpendicular distance between “G” and the direction of the action of the force of buoyancy is called:
the righting lever (GZ)
the metacentre (M)
the center of buoyancy (B)
the center of gravity (G)
List is normally caused by:
weights being added high in the vessel
weights being added low in the vessel
external forces acting on the hull of the vessel
weights being shifted transversely.
A vessel is said to be heeled when she is:
laid over to one side so that work may be done on the opposite side.
on a slipway and blocks are secured under her hull to keep her upright.
rolled to one side or the other when acted on by wind and/or sea.
heavy laden with ice.
If a vessels center of gravity is above the metacentre the vessel is said to be in:
stable equilibrium
neutral equilibrium (have zero GM)
unstable equilibrium (have a negative GM)
a lolled condition.
What would the ship’s stability condition be if the center of gravity coincided with the metacentre?
The ship would have excessive stability
The ship would be in a condition of neutral equilibrium.
The ship would have positive GM.
The ship would have a negative GM.
Why is the metacentric height a measure of the vessel’s initial stability?
Because the size of the metacentric height is proportional to the righting lever at a given moderate angle of heel.
Because the metacentric height is related to the the height of the metacentre above the center of buoyancy.
Because the metacentric height is directly related to the position of the center of gravity.
Because the greater the metacentric height the larger is the initial stability.
The angle of loll is described as:
the angle at which a vessel having a negative GM will rest.
the angle at which a vessel having zero GM will rest.
the angle at which a vessel having positive GM will rest.
the angle at which the vessel heels in a seaway.
When a vessel in unstable or neutral equilibrium is to be made stable the center of gravity has to be lowered. Which of the following would be an effective way of lowering a vessel’s center of gravity?
Weights already in the vessel may be lowered.
Weights may be loaded below the center of gravity.
Weights may be discharged from positions above the center of gravity.
All of the above.
A stiff ship is one defined as having a:
small GM.
slow, sluggish side to side motion.
zero GM.
large GM.
A tender ship is one defined as having a:
small GM
large GM
zero GM
quick roll, sometimes even violent
