USCG Cargo Operations and Stability

Question 1

What is the purpose of a vessel's stability booklet?

Accepted Answer

To provide loading guidance to ensure the vessel remains stable

Answer

The stability booklet provides the master with loading guidance, including maximum KG curves and sample loading conditions, to ensure the vessel maintains adequate stability at sea.

Question 2

What does 'GM' represent in vessel stability?

Accepted Answer

Metacentric height — the distance between the center of gravity and metacenter

Answer

GM (metacentric height) is the vertical distance between the vessel's center of gravity (G) and the metacenter (M); a positive GM indicates initial stability.

Question 3

When loading heavy cargo, where should it be stowed to improve stability?

Accepted Answer

As low as possible in the vessel

Answer

Stowing heavy cargo low in the vessel lowers the center of gravity (G), which increases GM and improves the vessel's stability.

Question 4

What is 'free surface effect' in cargo operations?

Accepted Answer

The reduction in stability caused by liquid sloshing in a partially filled tank

Answer

Free surface effect occurs when liquid in a partially filled tank shifts as the vessel heels, raising the virtual center of gravity and reducing GM.

Question 5

What does a negative GM indicate?

Accepted Answer

The vessel is unstable and will not return upright after heeling

Answer

A negative GM means the metacenter is below the center of gravity; the vessel is in an unstable equilibrium and will loll or capsize rather than return upright.

USCG - United States Coast Guard Practice Test

USCG - United States Coast Guard Practice Test

USCG Cargo Operations and Stability