SAMS Vessel Stability and Naval Architecture 2

Question 1

The angle of loll occurs when:

Accepted Answer

A vessel with negative initial GM finds a heeled equilibrium position

Answer

A vessel is overloaded and its draft exceeds the load line mark

Answer

A vessel reaches its maximum righting lever on the GZ curve

Answer

A vessel's trim exceeds safe operational limits

Question 2

Reserve buoyancy is best described as:

Accepted Answer

The intact watertight volume of the vessel above the waterline

Answer

The additional cargo capacity available above the assigned load line

Answer

The difference between light ship displacement and full load displacement

Answer

The extra stability provided by permanently installed ballast

Question 3

The longitudinal center of gravity (LCG) is primarily used to calculate:

Accepted Answer

The vessel's trim (fore-and-aft inclination)

Answer

The vessel's transverse rolling period in calm water

Answer

The initial transverse metacentric height

Answer

The righting arm at extreme angles of heel

Question 4

The downflooding angle is the angle of heel at which:

Accepted Answer

Water begins to enter the vessel through non-watertight openings above the waterline

Answer

The vessel's propulsion efficiency drops below acceptable limits

Answer

The righting lever (GZ) reaches its maximum positive value

Answer

The vessel's keel becomes visible above the water surface on the high side

Question 5

A GZ stability curve with a large area under it indicates:

Accepted Answer

Good dynamic stability and strong resistance to capsizing

Answer

Poor initial stability and a tender vessel

Answer

High freeboard requirements under load line regulations

Answer

Excessive roll damping that causes structural fatigue

Question 6

Deadweight tonnage (DWT) represents:

Accepted Answer

The total weight a vessel can carry including cargo, fuel, ballast, crew, and stores

Answer

The lightweight displacement of the vessel's hull and permanently fixed machinery

Answer

The vessel's full load displacement measured in long tons

Answer

The weight of water displaced when the vessel floats at its assigned load line

Question 7

Adding ballast weight at a low position in the vessel will:

Accepted Answer

Lower the center of gravity and improve transverse stability

Answer

Raise the center of gravity and reduce transverse stability

Answer

Have no effect on stability if the weight is on the centerline

Answer

Increase freeboard and reserve buoyancy proportionally