Trim, Stability, Stress. Test 3 – Online Maritime Tests

What is a 'Pro-metacentre?'

What is 'initial stability?'

It is the vessel's GM, after completion of loading.
It is the vessel's GM, before commencement of loading.
It is the stability of the vessel in her initial position, and is expressed by metacentric height.
It is the stability status of the ship, when first delivered to owners from the shipyard.

What is the purpose of performing an Inclining Experiment or Stability Test?

To determine the maximum angle of heel, before a ship will capsize.
There is no need for such an experiment, because the information it gives may be obtained in various other easier ways.
To test the safe working load of a derrick or crane.
It is done to find out the 'GM' of a vessel, plus the Ship's Lightweight, and VCG & LCG at this Lightweight.

What is the 'Wave Period?'

It is the time in seconds between successive wave crests or troughs, passing a fixed point.
It is the comparison of the height of successive waves.
It is the time in minutes between successive wave crests, passing a fixed point.
It is the time interval between the highest waves, in a sequence of waves.

What is the 'critical time,' in a drydocking operation?

How is a 'Turning Couple' formed?

A couple is formed when two unequal parallel forces are acting in the same direction.
A couple is formed when two equal parallel forces are acting in opposite directions.
A couple is formed when two unequal forces in a vertical position are acting in the same direction.
A couple is formed by joining two vertical posts together.

What is meant by 'Synchronism or Resonance?'

This is a situation used to describe gentle rolling.
This a dangerous condition that occurs when the ship's still water period and the apparent wave period are equal.
This is a term used to describe pitching and rolling.
This is a term used to describe violent rolling.

What is 'Statical Stability?'

It is the ability of a vessel to return to her initial or upright position, after having been forcibly inclined.
It is the basic stability information a vessel is required to carry by law.
It is another name for the metacentric height.
It is the relationship between the moment of a couple and the righting moment.

What formula do you use to determine the 'GM' from an Inclining Experiment?

GM = w by distance by length of plumbline divided by W by deflection of the plumbline.
GM = KM by d by 1/2 length of plumbline divided by w by length of plumbline .
There is no formula. You simply measure the deflection of the plumbline with a tape measure.
GM = w by length of plumbline divided by W by deflection of the plumbline.

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