Online test SETS 6000 for Control Trim, Stability and Stress

Welcome to the website where you can pass online the Seafarer Evaluation Training System (SETS) test on «CM1 – Control Trim, Stability and Stress». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. SETS based on practical information and marine specialists experience.

SETS tests developed for evaluating seaman basic knowledge by company “Naval Education Services” is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW Section A-V/1-2.

SETS tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew.

Current test contains SETS questions in area «CM1 – Control Trim, Stability and Stress». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.

«CM1 – Control Trim, Stability and Stress» subject includes theoretical and practical information about advanced training for work on any type of vessel. This comprehensive examination is designed to rigorously assess a deep understanding and application of vessel stability principles. Candidates will be tested on their ability to perform critical calculations, including determining a vessel’s center of gravity, metacentric height (GM) and righting lever (GZ). A significant portion of the exam focuses on analyzing and interpreting stability data from the vessel’s approved stability booklet to ensure operational safety. The test evaluates the proficiency in using stress calculating equipment and software to monitor hull stress forces during cargo operations and in heavy weather. Practical scenario-based questions require demonstrating the correct procedures for controlling trim and stability during various loading and discharging conditions. Knowledge of the direct impact of free surface effect on stability and the methods to minimize its risks is a core component of the assessment. The examination includes solving complex problems related to calculating and mitigating shear forces and bending moments to maintain hull structural integrity. Successfully passing this assessment is essential for officers responsible for planning and executing cargo operations safely on any type of vessel.

On this site SETS on the subject «CM1 – Control Trim, Stability and Stress» contains 26 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.

Choose the regime, in which you want to pass SETS test:

Start test

* Some questions may have more than 1 correct answer.

“SETS test” finished! Your result:

Correct answers:

Try to pass SETS test again

Use the search below to find question.

Amount of questions: 26.

Right answers marked with this sign .

What does “Permeability” mean?

To make a compartment watertight.

The flooding of the engine room compartment.

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

The process of making a compartment non – porous.

How is a “Turning Couple” formed?

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.

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

What is “Statical Stability“?

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

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 ability of a vessel to return to her initial or upright position, after having been forcibly inclined.

What is a “Pro-metacentre“?

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

It is just another name for metacentre.

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

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

What is “initial stability“?

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

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.

What is “dynamical stability“?

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

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

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

It is the energy generated by a rolling vessel.

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

By completely emptying all partly filled double bottom tanks.

By jettisoning the entire deck cargo of timber.

By filling all wing ballast tanks.

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

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

Stability test

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

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.

It is done to find out the “GM” of a vessel, plus the Ship’s Lightweight, and VCG & LCG at this Lightweight.

How do you ensure reliable results from an Inclining Experiment?

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

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

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

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

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

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.

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.

What is the “Wave Period”?

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 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.

What is meant by “Synchronism or Resonance“?

This is a situation used to describe gentle rolling.

This is a term used to describe violent rolling.

This is a term used to describe pitching and rolling.

This a dangerous condition that occurs when the ship’s still water period and the apparent wave period are equal.

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 try to alter the wave period by altering course and by reducing speed.

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

You should put your ship’s beam on to the sea and increase speed.

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 reduced by the amount the “high” side rises above the upright position.

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 increased by the difference between the high side draft and the low side draft.

What do the intersecting horizontal lines signify in the diagram?

Angle of Trim

The change in the Centre of Flotation, after trimming.

They show the actual angle of trim.

The change of draft after trimming.

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

What is the “critical time,” in a drydocking operation?

Just before the ship takes the blocks at the stern.

When they start to empty the drydock.

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

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

What is the “Centre of Pressure“?

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

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

It is the pressure at the Centre of Flotation.

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

What effect does “Freeboard” have on a vessel’s dynamical stability?

It does not have any effect on dynamical stability.

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

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

Freeboard and dynamical stability are not related in any way.

What is the formula to calculate the “Volume of Displacement?”

L by 1/2 B by draft by Freeboard.

L by GM by KG.

L by B by d by Cb.

B by KM by d by Cb.

What is the minimum allowable value for GM?

0,35 m.

0,25 m.

0,15 m.

0,45 m.

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

Breadth squared / 12 × draught.

Breadth squared / 6 × draught.

Breadth cubed / 12 × draught.

Breadth × draught / 10.

What are “Hydrostatic Curves” used for in ship calculations?

Obtaining the shape of the body sections.

Mainly for trim calculations for predicting end draughts.

For hydrostatic pressures on bulkheads.

For pressures at various depths in oil fuel bunkers.

What is the minimum allowable value for GZ?

0,35 m.

0,42 m.

0,15 m.

0,2 m.

What is a “Prismatic co-efficient“?

The same as the block co-efficient.

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

Cm / Cb.

Volume of Displacement / (midship area × LBP). Also = Cb / Cm.

What are “Cross Curves of Stability” used for onboard a ship?

Obtaining Statical Stability curves at known Displacements.

Giving the capacity of various holds or tanks.

Showing tank calibration values.

Similar to a set of Bonjean curves.

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

Loadline marks

One forty-eighth of the summer draft.

One sixtieth of the summer draft.

Four fifths of the FWA.

Nine tenths of the FWA.