AB AB Vessel Stability and Trim

Question 1

What does metacentric height (GM) measure?

Accepted Answer

A vessel's initial transverse stability

Answer

The vessel's forward draft

Answer

The vessel's speed through water

Answer

The distribution of cargo weight

Question 2

When is a vessel's GM considered 'positive'?

Accepted Answer

When the metacenter (M) is above the center of gravity (G)

Answer

When the center of gravity is above the metacenter

Answer

When the forward and after drafts are equal

Answer

When freeboard is at the minimum allowed

Question 3

What is 'free surface effect'?

Accepted Answer

Loss of stability caused by liquid shifting in a partially filled tank

Answer

The drag effect of waves on the hull

Answer

The buoyancy effect of the waterplane area

Answer

Stability loss caused by topside icing

Question 4

What is a vessel's 'righting moment'?

Accepted Answer

The restoring force that returns a heeled vessel toward upright

Answer

The force causing a vessel to heel over

Answer

The turning force applied by the rudder

Answer

The holding force of the anchor and chain

Question 5

What happens to a vessel's initial stability when the center of gravity (G) rises?

Accepted Answer

Stability decreases as GM is reduced

Answer

Stability increases as GM grows

Answer

Stability is unaffected by G position

Answer

The vessel trims by the head

Question 6

What does 'list' mean in vessel stability terms?

Accepted Answer

A permanent lean to one side caused by off-center weight distribution

Answer

A temporary rolling motion induced by waves

Answer

The difference in draft between bow and stern

Answer

A sudden change in the vessel's heading