100 multiple choice 71-99

The internal volume of watertight spaces above the waterline is very important to a vessel's stability. These spaces are referred to as its:

• Reserve freeboard

• Reserve buoyancy

• Reserve displacement

• Down flooding reserves

If performed properly, a roll period test can determine the approximate value of a vessel's metacentric height. It is also a useful tool to:

• Determine the approximate angle at which a vessel has its maximum righting levers (angles of maximum GZ levers)

• Determine if the stability of the vessel has changed over time

• Determine the angle of vanishing stability

• All of the above

What is the relationship between metacentric height and the vessel's initial stability?

• The greater the metacentric height, the larger the initial stability

• They are not related to one another

• The relationship depends on the position of the center of gravity

• The relationship depends on the position of the center of buoyancy

The righting arm is identified by the distance between:

• G and M or GM

• G and B or GB

• G and Z or GZ

• B and M or BM

The following information can be extracted from the GZ curve for a particular condition of load:

• Maximum GZ lever

• Initial GM

• Righting energy available

• All of the above

As a vessel's deck edge becomes immersed, the following occurs:

• Although the GZ levers are increasing, the rate of increase has slowed down

• The shape of the GZ curve changes from concave to convex

• The watertight integrity of the vessel becomes of particular importance as protection against down-flooding

• All of the above

According to the statical stability curve (GZ curve), all remaining reserves of stability and righting energy are lost at the angle of:

• Deck edge immersion

• 57.3 degrees or one radian

• Contraflecture

• Vanishing stability or down-flooding

The extent of heel over which a vessel has positive righting levers is known as:

• The range of stability

• The angle of vanishing stability

• The maximum GZ

• The initial GM

In the course of a voyage, fuel is consumed from tanks located in the bottom of the ship. What effect would this have on the stability of the ship?

• It would increase the ship’s stability

• It would decrease the ship’s stability

• It would have no appreciable effect on the ship’s stability

• It would improve the seaworthiness of the ship

The carriage of fishing gear on the deck of a vessel is of concern from a safety perspective due to the following:

• Added weight may cause the vessel’s stability to be greatly reduced

• Blocked freeing ports to prevent gear from washing overboard will increase the vessel’s stability should water be shipped over the rail

• Gear stacked high will lower G but must be properly secured with lashings

• All of the above