SAMS Vessel Stability and Naval Architecture

Question 1

What does metacentric height (GM) measure in vessel stability?

Accepted Answer

The vertical distance from the center of gravity to the metacenter

Answer

The vertical distance from keel to waterline

Answer

The horizontal distance between the center of buoyancy and metacenter

Answer

The distance from the waterline to the main deck

Question 2

A vessel with a negative GM will:

Accepted Answer

List permanently to one side and risk capsizing

Answer

Have excessive initial stability and a very stiff roll

Answer

Float higher than its designed waterline

Answer

Develop excessive trim by the stern

Question 3

The center of buoyancy (B) is located at:

Accepted Answer

The centroid of the underwater displaced volume of the vessel

Answer

The geometric center of the entire vessel hull above and below water

Answer

The midpoint between the keel and the waterline on the centerline

Answer

The point where the vessel's waterline intersects the hull sides

Question 4

Freeboard is defined as:

Accepted Answer

The vertical distance from the waterline to the upper deck edge

Answer

The distance measured from the keel to the waterline

Answer

The weight of cargo a vessel can carry above its load line

Answer

The reserve buoyancy capacity expressed as a percentage of displacement

Question 5

The righting lever (GZ) in a stability analysis represents:

Accepted Answer

The horizontal distance between vertical lines through G and B when the vessel is heeled

Answer

The vertical distance from the keel to the center of gravity at any angle of heel

Answer

The angle at which a vessel will capsize under dynamic loading

Answer

The restoring force per degree of heel expressed in foot-tons

Question 6

Displacement tonnage of a vessel is equal to:

Accepted Answer

The weight of water displaced by the vessel, equal to the vessel's total weight

Answer

The total internal cargo volume measured in long tons

Answer

The deadweight capacity minus the weight of fuel and stores

Answer

The gross tonnage adjusted by a regulatory coefficient

Question 7

Bilge keels are fitted on a vessel primarily to:

Accepted Answer

Reduce rolling motion by creating hydrodynamic resistance as the vessel rolls

Answer

Protect the hull bottom from grounding damage in shallow water

Answer

Improve directional stability and reduce leeway when underway

Answer

Increase the vessel's speed by streamlining water flow past the hull