AB AB Vessel Stability and Trim 2

Question 1

How is 'trim' defined in naval architecture?

Accepted Answer

The difference between the forward draft and the after draft

Answer

Trim is the difference between the after draft and the forward draft, indicating whether the bow or stern is deeper in the water.

Question 2

What is the 'center of buoyancy'?

Accepted Answer

The geometric center of the vessel's submerged volume

Answer

The center of buoyancy (B) is the geometric center of the submerged hull volume, through which the upward buoyant force acts.

Question 3

What is 'freeboard'?

Accepted Answer

The vertical distance from the waterline to the main deck edge

Answer

Freeboard is the vertical distance from the waterline to the main deck edge amidships, representing the vessel's reserve buoyancy.

Question 4

What does 'displacement' mean when applied to a vessel?

Accepted Answer

The weight of water displaced by the hull, which equals the vessel's total weight

Answer

By Archimedes' principle, a floating vessel displaces a weight of water exactly equal to its own total weight, and this is called the vessel's displacement.

Question 5

What does the load line (Plimsoll mark) indicate?

Accepted Answer

The maximum safe loading depth in various zones and seasons

Answer

The load line (Plimsoll mark) shows the maximum depth to which a vessel may be loaded under various sea area and seasonal conditions.

(AB) Able Seaman Exam Practice Test

(AB) Able Seaman Exam Practice Test

AB AB Vessel Stability and Trim 2