Trim, Stability, Stress. Test 2 – Online Maritime Tests

What is 'dynamical stability?'

It is the energy generated by a rolling vessel.
It is the expression used to describe the transfer of buoyancy, from one side to the other, when a vessel heels.
It is the expression used to describe a vessel, that is in the most stable condition possible.
It is the measure of the work that is done when the vessel is inclined by external forces.

How do you ensure reliable results from an Inclining Experiment?

Tighten all moorings, use a weight not less than 10 tonnes, and make an accurate sounding of all tanks.
It must be done in early morning or late evening, when the least number of people are likely to be around.
No specific preparations are necessary, and it can be done even in very windy conditions.
Perform test in calm conditions, with slack moorings, with minimum number of personnel, and minimise free surface effects of liquids.

When cross-flooding arrangements to correct unsymmetrical flooding and excessive heel angels in damaged condition are installed in passenger ships, what is the maximum time allowed for equalization?

15 minutes
30 minutes
20 minutes
10 minutes

What is the effect on draft caused by a vessel heeling or listing?

There is no change in draft, regardless of the extent of the list.
The draft is increased by the difference between the high side draft and the low side draft.
The draft is increased by the difference in the heeled draft measured by a straight line in tangent with the keel, and the draft before heeling.
The draft is reduced by the amount the 'high' side rises above the upright position.

If your vessel is tending to 'synchronise ', what should you do to alter this condition?

You should increase your speed to full, whilst maintaining the same course.
You should put your ship's beam on to the sea and increase speed.
You should try to alter the wave period by altering course and by reducing speed.
You stop your ship and wait for the synchronising to stop.

What do the intersecting horizontal lines signify in the diagram?

They only serve as a base for the two vertical lines.
The change in the Centre of Flotation, after trimming.
The change of draft after trimming.
They show the actual angle of trim.

What measures regarding ship stability should be taken in order to make passenger ships able to withstand critical damage?

Damaged stability to be increased by weight redistribution.
Avoid overloading the ship
Maintain sufficient intact stability
Damaged stability to be increased by use of water ballast

What is the result of a 'high metacentric height'?

The vessel will have a great bending moment?
The vessel's tweendeck heights is too high?
The vessel will roll violently?
The vessel will roll slowly or be unstable?

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