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

How is a 'Turning Couple' formed?

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

What is the 'Wave Period?'

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

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

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.
To determine the maximum angle of heel, before a ship will capsize.

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

What is 'Statical Stability?'

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

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

GM = w by length of plumbline divided by W by deflection of the plumbline.
There is no formula. You simply measure the deflection of the plumbline with a tape measure.
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 .

What is meant by 'Synchronism or Resonance?'

This is a term used to describe violent rolling.
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.

What is 'initial stability?'

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

What is a 'Pro-metacentre?'

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