EN-CM1-CTSS

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

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2.How would you increase the KG of a ship, loaded with a timber deck cargo, that has become"unstable?"

3.How do you ensure reliable results from an Inclining Experiment?

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1. To test the safe working load of a derrick or crane. nmlkj

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

3. There is no need for such an experiment, because the information it gives may be obtained in variousother easier ways.

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4. It is done to find out the "GM" of a vessel, plus the Ship's Lightweight, and VCG & LCG at thisLightweight.

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1. By completely emptying all partly filled double bottom tanks. nmlkj

2. By jettisoning the entire deck cargo of timber. nmlkj

3. By filling all wing ballast tanks. nmlkj

4. By filling the small divided double bottom tanks on the lower side, whilst jettisoning the deck cargofrom the higher side.

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1. Perform test in calm conditions, with slack moorings, with minimum number of personnel, andminimise free surface effects of liquids.

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2. Tighten all moorings, use a weight not less than 10 tonnes, and make an accurate sounding of all

tanks.

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3. No specific preparations are necessary, and it can be done even in very windy conditions. nmlkj

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4.What is "initial stability?"

5.What is meant by "Synchronism or Resonance?"

6.What is a "Pro-metacentre?"

7.What is "dynamical stability?"

8.What formula do you use to determine the "GM" from an Inclining Experiment?

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4. It must be done in early morning or late evening, when the least number of people are likely to bearound.

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1. It is the stability status of the ship, when first delivered to owners from the shipyard. nmlkj

2. It is the stability of the vessel in her initial position, and is expressed by metacentric height. nmlkj

3. It is the vessel's GM, before commencement of loading. nmlkj

4. It is the vessel's GM, after completion of loading. nmlkj

1. This is a situation used to describe gentle rolling. nmlkj

2. This is a term used to describe violent rolling. nmlkj

3. This is a term used to describe pitching and rolling. nmlkj

4. This a dangerous condition that occurs when the ship's still water period and the apparent waveperiod are equal.

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1. This expresses KM as moving away off the centreline at large angles of heel. nmlkj

2. It is just another name for metacentre. nmlkj

3. It is the ability of a vessel to return to an upright position. nmlkj

4. It is the term used to indicate a vessel has a more than adequate GM. nmlkj

1. It is the expression used to describe a vessel, that is in the most stable condition possible. nmlkj

2. It is the expression used to describe the transfer of buoyancy, from one side to the other, when avessel heels.

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3. It is the measure of the work that is done when the vessel is inclined by external forces. nmlkj

4. It is the energy generated by a rolling vessel. nmlkj

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

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

11.What do the intersecting horizontal lines signify in the diagram?

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1. GM = w by distance by length of plumbline divided by W by deflection of the plumbline. nmlkj

2. GM = KM by d by 1/2 length of plumbline divided by w by length of plumbline . nmlkj

3. GM = w by length of plumbline divided by W by deflection of the plumbline. nmlkj

4. There is no formula. You simply measure the deflection of the plumbline with a tape measure. nmlkj

1. You should increase your speed to full, whilst maintaining the same course. nmlkj

2. You should try to alter the wave period by altering course and by reducing speed. nmlkj

3. You stop your ship and wait for the synchronising to stop. nmlkj

4. You should put your ship's beam on to the sea and increase speed. nmlkj

1. There is no change in draft, regardless of the extent of the list. nmlkj2. The draft is reduced by the amount the "high" side rises above the upright position. nmlkj

3. The draft is increased by the difference in the heeled draft measured by a straight line in tangent withthe keel, and the draft before heeling.

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4. The draft is increased by the difference between the high side draft and the low side draft. nmlkj

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12.What is the "Wave Period?"

13.What are "Cross Curves of Stability" used for onboard a ship?

14.How is a "Turning Couple" formed?

1. The change in the Centre of Flotation, after trimming. nmlkj

2. They show the actual angle of trim. nmlkj

3. The change of draft after trimming. nmlkj

4. They only serve as a base for the two vertical lines. nmlkj

1. It is the comparison of the height of successive waves. nmlkj

2. It is the time in minutes between successive wave crests, passing a fixed point. nmlkj

3. It is the time in seconds between successive wave crests or troughs, passing a fixed point. nmlkj

4. It is the time interval between the highest waves, in a sequence of waves. nmlkj

1. Obtaining Statical Stability curves at known Displacements. nmlkj2. Giving the capacity of various holds or tanks. nmlkj

3. Showing tank calibration values. nmlkj

4. Similar to a set of Bonjean curves. nmlkj

1. A couple is formed when two equal parallel forces are acting in opposite directions. nmlkj

2. A couple is formed when two unequal forces in a vertical position are acting in the same direction. nmlkj

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15.What is "Statical Stability?"

16.What does "Permeability" mean?

17.What is the minimum allowable value for GM?

18.What is the BM for a box-shaped vessel in terms of breadth and draught?

19.What is the minimum allowable value for GZ?

3. A couple is formed by joining two vertical posts together. nmlkj

4. A couple is formed when two unequal parallel forces are acting in the same direction. nmlkj

1. It is the basic stability information a vessel is required to carry by law. nmlkj

2. It is the relationship between the moment of a couple and the righting moment. nmlkj

3. It is another name for the metacentric height. nmlkj

4. It is the ability of a vessel to return to her initial or upright position, after having been forciblyinclined.

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1. To make a compartment watertight . nmlkj

2. The flooding of the engine room compartment. nmlkj

3. The relationship between the volume of a compartment and the volume available for water if bilged. nmlkj

4. The process of making a compartment non - porous. nmlkj

1. 0.35m nmlkj

2. 0.25m nmlkj

3. 0.15m nmlkj

4. 0.45m nmlkj

1. Breadth squared / 12xdraught. nmlkj

2. Breadth squared / 6 x draught. nmlkj

3. Breadth cubed / 12 x draught. nmlkj

4. Breadth x draught / 10. nmlkj

1. 0.35m nmlkj

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20.What is a "Prismatic co-efficient?"

21.What are "Hydrostatic Curves" used for in ship calculations?

22.What is the "critical time," in a drydocking operation?

23.What is the "Centre of Pressure?"

24.What is the formula to calculate the "Volume of Displacement?"

2. 0.42m nmlkj

3. 0.2m nmlkj

4. 0.15m nmlkj

1. The same as the block co-efficient. nmlkj

2. A co-efficient for a box-shaped vessel only. nmlkj

3. Cm / Cb. nmlkj

4. Volume of Displacement / (midship area x LBP). Also = Cb / Cm. nmlkj

1. Obtaining the shape of the body sections. nmlkj

2. Mainly for trim calculations for predicting end draughts. nmlkj

3. For hydrostatic pressures on bulkheads. nmlkj

4. For pressures at various depths in oil fuel bunkers. nmlkj

1. Just before the ship takes the blocks at the stern. nmlkj

2. When they start to empty the drydock. nmlkj

3. After the ship has taken to the blocks, and shores are being put in place. nmlkj

4. As the ship enters the dockgates, to ensure she not moving too fast. nmlkj

1. It is the point where the total thrust of the pressure could be considered to act. nmlkj

2. It is the pressure in the centre of a specific tank. nmlkj

3. It is the pressure at the Centre of Flotation. nmlkj

4. It is the part that is least likely to give way to external pressure. nmlkj

1. L by 1/2 B by draft by Freeboard.

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25.What effect does "Freeboard" have on a vessel's dynamical stability?

26.The diagram shows loadline marks. How is the distance between S and T calculated?

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1. 1. 2. 3. 4.

2. 1. 2. 3. 4.

3. 1. 2. 3. 4.

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2. L by GM by KG. nmlkj

3. L by B by d by Cb. nmlkj

4. B by KM by d by Cb. nmlkj

1. It does not have any effect on dynamical stability. nmlkj

2. As freeboard increases, the range of stability also increases, and this in turn leads to greaterdynamical stability.

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3. If freeboard is greater, then the dynamical stability is correspondingly reduced. nmlkj

4. Freeboard and dynamical stability are not related in any way. nmlkj

1. One forty-eighth of the summer draft nmlkj

2. One sixtieth of the summer draft nmlkj

3. Four fifths of the FWA nmlkj

4. Nine tenths of the FWA nmlkj

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