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在线测试： Test online CES 5.1 for 2nd-Off / 3rd-Off, Passenger vessel
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Among working conditions listed below which one is required for every propulsion engine of lifeboats?
For a period of at least 72 hours
Propeller permanently driven by the engine
Propeller disengaged and ahead or astern propulsion
Self-starting and launch procedure simultaneous
Fire protected lifeboats when waterborne should be capable of protecting its full complement when subjected to a continuous oil fire that envelops the boat for a period of not less than how many minutes?
10 minutes
15 minutes
8 minutes
20 minutes
Give the meaning of the following symbol
EPIRB
Survival craft distress pyrotechnic signals
Rocket parachute flares
Line throwing appliance
*What are the main components of the atmospherical air?
O2: 75% N2: 10% H2O: 5% CO2: 5%, Rare gases: traces
O2: 21% N2: 72% H2O: 5% CO2: 2% Rare gases: traces
O2: 21% N2: 78% H2O: traces CO2: traces, Rare gases: traces
O2: 50% N2: 50% H2O: traces CO2: traces Rare gases: traces
Among the additives used to improve the effectiveness of water in the fight against fire there are the moisturing ones. What is the task they perform?
They reduce the surface tension of water
They protect the fuel with a thin covering that holds up the ignition
They increase the viscosity of water
They protect the fuel with a thin covering that holds up the ignition and they increase the viscosity of water
*What is the list that must be overcome by a self-closing fire door on a passenger ship?
15?
22,5?
3,5?
10?
*Which of the following preventive actions are required by the International Maritime Dangerous Guide Code?
Actions relating to the classification of the dangerous goods
Actions realting to the segregation of the dangerous goods
All these actions are required
Actions relating to the packing of the dangerous goods
What is the main advantage of a Positive Pressure Breathing apparatus?
The positive pressure makes it easier to breath when working hard.
It is less complicated and cheaper than the demand type BA set.
It ensures a constant supply of air.
If the face mask has a leak toxic fumes/smoke would still not enter the mask.
*In case each hydrant is not fitted with hose and nozzles, what is the requirement ?
Hoses with fixed nozzles must be kept ready for use in conspicuous positions near the hydrants
There must be a complete interchangeability of hose couplings and nozzles
Hoses and nozzles for each hydrant must be available at the fire stations
At each fire station, sufficient number of hoses with nozzles for the hydrants in the area shall be available
*In cargo ships of less than 1000 gross tonnage the number of fire hoses (not including any hose required in any engineroom or boiler room ) must be:
One for each 10 m length of the ship plus one spare
To the satisfaction of the administration
One for each 10 m length of the ship
Four plus one spare for each deck
A DSC ‘distress alert’ message received contains the information: “GROUNDING”.This means that :
Don't know
For a good connection aerial transmitting has to be earthed
A vessel is aground
For a good connection transmitting receiving has to be earthed
What possible reason could there be for the identification mark associated with a Racon not being visible on the radar screen?
The radar may be suppressing the mark with application of the Interference Rejection control.
The racon may not be transmitting a pulse.
All of the suggested answers.
The transmitted radar frequency may not trigger the Racon transmitter.
Give the meaning of the following symbol
Remote controlled fire pumps
Foam release station
International shore connection
CO2 battery
Give the meaning of the following symbol
Portable foam applicator
Portable fire extinguisher
Powder installation
Foam installation
During search and rescue operations an aircraft crosses the wake of your vessel close astern at low altitude.What does it indicate, if the aircraft rocks its wings, opens and closes the throttle or changes the propeller pitch?
Please call me on VHF 16 as you are not answering my calls
Your assistance is no longer required
Follow my direction to the ship in distress
Please remain where you are and await further instructions
Your vessel is going alongside a pier. Two tugs will assist at the mooring. How would you use the tugs, and at which position?
Pushing on ship-s flat side and make fast in the vessel for pulling if needed
One made fast forward for pulling, one pushing aft
Fast FWD and AFT in center lead
Pushing on ship-s flat side not made fast to be able to move in best position if needed
The vessel has weighed the anchor and is heading for sea. The anchor is to be stowed in position. How?
The anchor to be as far inside hawsepipe as possible and secured by cable stopper
The anchor to be all way in the hawsepipe and secured by the brake
The anchor to be all way in the hawsepipe and secured by brake on winch and wire/chain stopper
The anchor to be all way in the hawsepipe and secured by wire lashings only
Once a ship (equipped with self-stowing auto-tension winches) is moored alongside a loading or discharging berth, it is recommended that:
All winches to be left with the manual brake on and out of gear.
All mooring winches be left in 'auto-tension' mode
The 'spring' winches be left in the auto-tension mode and all other winches with the manual brake on
The 'breastline' and 'headline' winches be left in the auto-tension mode and spring winches with manual brake on
In an extreme case, in addition to having your winch brakes as tight as can be, you can increase the brake holding capacity of the winch drum by putting it in gear and setting the power to the 'heave' position. However this may cause:
Damage to the winch by distorting the shaft
Strain on the fairleads and rollers in use in excess of their Safe Working Load
The increased braking power of the winch to exceed the breaking strength of the wire and rope paid out from it which might cause the wire or rope to part
All the listed alternatives
The vessel is in a 360 degrees turn with engine full ahead. If the speed is reduced during the turn, will there be any change in the turning diameter?
Yes, the turning diameter will increase if the speed is reduced.
No, the turning diameter will only change if the rudder angle is reduced
Yes, the turning diameter will be smaller if the speed is reduced.
No, the turning diameter will not change if the speed is reduced.
It is important that the brake holding capacity of a self stowing winch drum should not exceed the breaking strength of the wire or rope wound onto it. A certain percentage of extra strength is therefore recommended for the wire or rope over the brake holding capacity of the winch. So, for a winch of brake holding capacity of 60 Tons you would order a wire of breaking strength:
61 Tons
75 Tons
100 Tons
80 Tons
Should recommended route information be used in conjunction with weather routing?
Sometimes
Yes
No
Only if recommended by weather routing
The Muster List shall show the duties assigned to members of the crew. Which of the following duties shall be included in the "muster list" according to present regulations?
Preparation of immersion suits and thermo protective aids for the ship's passengers.
Preparation of survival craft's Emergency Positions Indicating Radio Beacons.
Closing of watertight doors, fire doors, valves, scuppers, sidescuttles, skylights.
Operation of the vessel's propulsion system.
What determines how containers should be lashed?
Advice from shore planners
OSHA regulations
SOLAS 74/88
The cargo securing manual
When will a hatch cover cross-joint wedge need replacement?
When the flat spring is bent
When the wedge is rusty
When the flat spring is missing
When the flat spring is rusty
What is the MARPOL definition of a "high-viscosity substance"?
A noxious liquid substance in category "Y" with a viscosity equal to or greater than 100 mPa.s at 37.8 degrees Celsius.
Any noxious liquid substance, the residues of which cannot be stripped from a cargo compartment and its associated piping and pumping system to equal to or less than 75 litres.
A noxious liquid substance of any category with a pour point of greater than 37.8 degrees Celsius.
A noxious liquid substance in category "X" or "Y" with a viscosity equal to or greater than 50 mPa.s at the unloading temperature.
Why do some diesel engine manufacturers recommend machining the valve spindle sealing surface with a half degree difference to the valve seat angle?
To improve valve sealing by compensating for expansion of the valve during high temperature operation.
To minimize heat transfer between valve and valve seat.
To improve valve sealing by compensating for pressure and temperature effects on the valve during engine operation..
To improve valve sealing by increasing contact force by reducing contact area between valve and seat.
LNG carriers are fitted with a deck water spray system? In addition to providing protection against fire and protection for the crew and cooling in the event of a fire in the cargo area, what is the other main purpose of having this system?
To heat the cargo area in case of a cargo spill incident.
To make it easier for the crew to keep the decks clean.
To extinguish fires inside the cargo tanks.
To flush cargo spill overboard and protect crew in case of a cargo spill incident.
Are membrane tanks designed for carrying of gas of ambient temperature?
No, membrane tanks are normally designed for transport of fully refrigerated cargoes.
Yes, if tank fitted with primary- and secondary membranes.
Yes, if the membrane is more than 50 mm thick.
Yes, if the membrane tank is designed for high pressure.
What is the description for a sidelight, as shown in rule 21 of the International Regulations for Preventing Collisions at Sea?
A green light on the starboard side and red light on the port side, showing an unbroken light over an arc of 135 degrees, from right ahead to 22.5 degrees abaft the beam on the respective side.
A green light on the starboard side and red light on the port side, showing an unbroken light over an arc of 112.5 degree, from right ahead to 22.5 degrees abaft the beam on the respective side.
A red, green or yellow lantern, showing an unbroken light over an arc of 112.5 degrees.
A red light or a green light, with a minimum range, in a vessel of 50 metres or more, of 3 miles. In a vessel of 10 metres or more but less than 50 metres in length, a range of 1 mile.
What is the main problem associated with a bulk cargo suffering moisture migration and developing a flow state
The may block up bilges
The cargo pile will remain stable
The cargo becomes semi-liquid and shifts easily causing major stability problems
The cargo may produce carbon dioxide gas
Training manuals for Life Saving Appliances and Fire Fighting systems and equipment shall be provided in crew mess room, recreation room or in each crew cabin. The training manuals shall explain the following in detail:
General Emergency procedures
Emergency procedures including alarm signals, general instructions and safety practice onboard, specific information on equipment, operation of equipment
Alarm signals and donning of lifjackets
Manufacturer's specific information on equipment including maintenance procedures, operation of equipment
Why is cotton the most suitable material for galley work clothes?
It is odour resistant, loose fitting and does not shrink or discolour when washed reasonably regularly.
It is more easily made into fashionable catering uniforms than synthetic fibres and is cheaper.
It is absorbant, hard-wearing, comfortable and can withstand frequent laundering at high temperatures.
It is effective at masking body odour and containing perspiration.
What is "Viscosity"?
The property of a liquid which determines its resistance to flow.
The scale which records the pour point of liquids.
The ability of a substance to overcome friction.
The term used to
Pump rooms on oil tankers shall be provided with a fixed fire-extinguishing system. Which of the following systems is in accordance with present regulations? (SOLAS II-2/63)
Fixed pressure water spraying system
Fixed high expansion foam system
Fixed CO2 fire-extinguisher system
Fixed powder fire-extinguishing system
There are strict rules governing the placement and category of electrical equipment allowed in certain areas of liquefied gas carriers. One such category is that of flameproof enclosures. What is a flameproof enclosure?
One in which the equipment has such low electrical power that there is insufficient energy to ignite a flammable mixture and cause a flame.
One which can withstand the pressure build-up during an internal ignition of a flammable mixture and is designed to cool any flames occurring within the enclosure to below the ignition temperature.
One which is filled with inert gas to prevent formation and possible ignition of a flammable mixture.
One which is maintained under positive pressure so preventing the formation of a flammable mixture.
Who is responsible to ensure that all personnel on board are provided with suitable Personal Protective Equipment where it is needed?
The Head Department
The Master
The Company/ employer
The safety officer
What are the people probably doing in the picture?
The people are fighting a fire
The people are playing with water
The people are hosing down the cargo hold to clean it.
The people are pressure testing the hull plating
Chemicals and harmful substances are safely stored in a designated locker on board, why?
For safety reasons. Many substances found onboard are capable of damaging the health and safety of those exposed to them. Before any chemical or harmful substance is delivered to a crewmember, the personnel shall receive training, instructions and information so that they know and understand the risks arising from use.
Chemicals and harmful substances must be kept away from passengers so that they don't steal it.
For safety reasons and stock control. When chemicals or harmful substances is delivered to a crewmember, the user shall sign for the amount received.
For stock control. Most of the chemicals and harmful substances we use on board are expensive.
How is the painter released from the lifeboat, once the boat is waterborne and ready to leave?
Cut it with the axe provided
Remove the toggle which will release the painter
The painter will automatically part by the weak link when the boat goes astern to clear the ship
Cut it with the knife contained in the equipment locker
On what criteria is the Threshold Limit Value (TWA) based?
The maximum concentration of a vapour to which a worker may be repeatedly exposed for a maximum of 12 hours per day, 5 days per week without serious health effects.
The concentration of a vapour expressed as a percentage of the oxygen content of an environment in which a fit human-being can work continuously for a period of 8 hours.
The time-weighted concentration of a substance to which a worker may be repeatedly exposed for a normal 8 hour working day and 40 hour week without adverse health effects.
The maximum concentration of harmful vapour to which a worker may be exposed for a period of 15 minutes up to 4 times within any 24 hour period without adverse respiratory effects.
After discharging petcoke and washing the cargo holds in the Mediterranean Sea where can a vessel bound for Aden discharge the cargo residue?
At a shore facility
In the Red Sea
In the Mediterranean Sea
In the Gulf of Aden
A vessel with a large transverse GM will have which of the following rolling periods?
Fast abrupt rolling period to small angles.
A moderately comfortable period with medium angles of heel.
Slow period of roll either side of an angle of loll.
Very slow and to large angles of heel.
A container vessel must alter her trim to depart even keel from the berth. Select the most appropriate means of altering trim.
By taking ballast into the lightest draught end of the vessel.
By altering the cargo disposition.
By discharging ballast from the deepest draught end of the vessel.
By internal shift of ballast.
During bilge pumping operations the pump suction gauge indicates a high vacuum. What is the most likely cause of the high vacuum reading?
Leaking pump gland.
A glogged bilge strainer.
A hole in the suction line.
Broken suction gauge.
What is the potential effect on a steam boiler of having calcium based compounds present in boiler water and proper water treatment is not carried out?
It will cause corrosion and scale deposits in the boiler..
It will form passive layers on the metal surfaces in the boiler..
It will reduce the TDS in the boiler..
No negative effects are likely.
A hazard is is a source of potential harm or damage or a situation with potential for harm or damage. Risk is determined based on evaluation of two elements. Which two elements?
The likelihood that a hazard may occur and the consequences of the hazardous event
The likelihood that a hazard may occur and the financial consequences for the Company
The likelihood that a hazard may occur and the available personal protective equipment we have onboard
The consequences of the hazardous event and the available personal protective equipment we have onboard
During inspection of a medium speed diesel engine piston of the composite type it is found that the steel crown is loose at its connection to the alloy skirt. Further inspection reveals damage to the surfaces and evidence of metal particles where the two parts are connected. Select, from the options given, the likely cause of this type of damage.
Fatigue due to excess compression at the joint between the components.
Crushing due to over tightening of the piston crown retaining bolts.
Shear of the metal surfaces due to excessive load on the engine.
Fretting due to loss of compression at the joint between the components.
Emergency instructions in appropriate languages shall be posted in passenger cabins. Which information shall as a minimum be included in the emergency instructions?
Name of cabin attendant
The method of donning life-jackets, escape routes and alarm signals
Where to find thermal protective aids
Escape routes and alarm signals
What is the benefit of using prismatic Type "B" tanks?
The benefit of maximising ship hull volumetric and having the entire cargo tank placed beneath the main deck.
The tank is completely self-supported and do not form part of the ship's hull structure.
The hold space can be filled with dry air.
The secondary barrier form part of the ship's hull.
How will continuous low load operation influence the time between overhauls, tbo, for the cylinder covers and associated valves of a 4-stroke diesel engine?
Reduce the time between overhauls due to increased fouling.
Increase the time between overhauls since fuel injectors work better at low load so combustion will be improved and the maintenance will be reduced.
Increase the time between overhauls since the engine is not working as hard.
No influence at all, the required overhauls are unaffected by operating load.
What type of damage does a cargo of steel coils sustain when loaded on a General Cargo ship?
Chemical reactions between the steel banding and outer envelope
Bending
Tearing
Crushing and distortion
What roll amplitude is generally used by classification societies in calculating rolling forces?
24 - 30 degrees
18 - 24 degrees
37 - 42 degrees
30 - 36 degrees
A very dusty cargo is to be loaded on a bulk carrier; what precautions on deck should be included?
No access allowed onto main deck
Decks washed down regularly
All cranes, deck houses and storerooms fully closed down to prevent entry of dust
No extra precautions need to be taken
Before loading operation starts, what shall you as duty officer observe?
The hoistable decks in correct positions and stanchion-guard placed where needed?
The angle on the stern ramp in order?
Leave everything to the crew?
Physical checking the ramp/cargo holds/hoistable decks and see that everything are in order and the ship-s gear correctly located?
What is the absolute maximum size for a cargo tanks on oil tankers?
Maximum 40,000 cubic metres.
Maximum 35,000 cubic metres.
Maximum 20,000 cubic metres.
Maximum 30,000 cubic metres.
Chemicals and harmful substances are safely stored in a designated locker on board, why?
For safety reasons. Many substances found onboard are capable of damaging the health and safety of those exposed to them. Before any chemical or harmful substance is delivered to a crewmember, the personnel shall receive training, instructions and information so that they know and understand the risks arising from use.
For safety reasons and stock control. When chemicals or harmful substances is delivered to a crewmember, the user shall sign for the amount received.
Chemicals and harmful substances must be kept away from passengers so that they don't steal it.
For stock control. Most of the chemicals and harmful substances we use on board are expensive.
A conventional reefer vessel is to have its refrigerating capacity increased by fitting a 'power pack' consisting of a diesel engine and generator housed in a twenty foot container. Which of the options given would be the best location to stow the ‘power pack’?
On the main deck, close to the fresh air inlets.
On the main deck, close to the fresh air exhausts.
On the main deck, well clear of the fresh air exhausts.
On the main deck, well clear of any fresh air inlets.
When unloading a generator, it is necessary to gradually decrease the load in order to avoid:
Undue overcurrent
Undue overload on the switchboard.
Undue overspeeding.
Undue temperature rise.
If a cargo leak occurs onboard a liquefied gas carrier it is likely that a 'white' vapour cloud will form. What makes the vapour cloud look white?
Condensation of nitrogen in the air.
Condensation of cargo vapour in the air.
Condensation of oxygen in the air.
Condensation of water vapour in the air.
"Your ship security plan must include procedures for responding to security threats, auditing security activities and interfacing with the port facility."
FALSE
.
TRUE
What distinguishes vapour connections (headers) from liquid cargo connections on a ship's manifold?
Liquid and cargo connections actually appear the same, but the ship's personnel always attach a small board to the applicable flange, identifying the cargo to be loaded and indicating whether it is for the liquid or vapour hose.
Vapour connections are painted yellow with green end bands, are marked with the words "not for liquid" and have a small hole capable of receiving a stud on the flange face at the six o'clock position.
Liquid connections are always marked with the corresponding tank number, while vapour connections are marked with the letter "V".
Vapour connections are painted yellow with red end bands, are marked with the word "vapour" (or "vapor") and have a small stud located on the flange face at the twelve o'clock position.
On which is it compulsory with ODME in connection with the cargo system?
On tankers of 150 gross tonnage and above.
On tankers of 250 gross tonnage and above.
On all tankers irrespective of size.
On tankers of 500 gross tonnage and above.
Which of the following fresh fruits should be used first?
Pears
Apples
Grapes
Oranges
Which of these foods, when consumed in high quantities, will increase the cholesterol level over time?
Vegetables
Fish
Pork
Chicken
During maintenance work on a fuel tank the engine room ratings are removing scale in preparation for re-coating. One of the ratings suddenly notices the smell of fumes even though the atmosphere had been satisfactorily tested before the work started. What action should the ratings take?
Stop work until the smell disappears and then carry on removing the scale.
Leave the tank immediately and have the atmosphere retested.
Ask for another fan to be switched on to increase the ventilation in the tank.
Put on breathing apparatus and carry on with the task.
Passenger ship engaged in international voyages shall carry through a muster for all passengers. At what latest time after embarkation shall the muster take place?
Before departure
No time limit
4 hours after the passengers embarked
Within 24 hours after the passengers embarked
How frequently should the PA-system (Public Address) be tested?
Every week
Every year
Every day
Every second year
Electric ozone generators are sometimes used to remove residual odours from refrigerated cargo spaces. Which of the options given is the additional action required to ensure the operation is successful?
The cargo space should be cooled down using the refrigeration plant.
The cargo space should be fumigated.
The fans should be run continuously in the cargo space.
The source of the odour must be located and removed.
On a Container vessel, which of the following statements is incorrect with regard to IMDG Class 2 cargoes?
These goods require protection from heat
These goods require protection against the accumulation of dangerous vapours
These goods require protection against moisture
These goods need to be stowed in a protected location
When loaded to what depth can bulk carriers constructed after 1 July 1999 withstand flooding of any one cargo hold?
The Tropical loadline
The Winter North Atlantic loadline
The Winter loadline
The Summer loadline
The circuit diagrams illustrate four different methods of wiring between a Pt 100 temperature sensor and its signal processing electronics. Which of the wiring methods gives the best measuring accuracy?
Figure 2
Figure 1
Figure 4
Figure 3
To maintain good relationship among the crew on board a vessel, one must be:
Polite and diplomatic while talking to crew members
Give authority to others
Strict and authoritative while giving orders
Understanding, Co-operative, and have respect from both sides
A palletised cargo is being loaded onto a reefer vessel. The cargo is stowed on wooden pallets. Select from the options given the best method to be used for lifting the pallets onboard the vessel in order to avoid damage to the pallet boards.
By using woven strops.
By using wire strops.
By using rope endless strops.
By using a patented semi-balanced lifting fork.
When there is doubt about the freshness of the atmosphere in ro-ro cargo spaces, what action should be taken?
Supply filter masks to all crew working on ro-ro deck
Ro-ro decks are always ventilated in advance of an operation
Arrangements should be made for testing of the atmosphere to ensure maintenance of 21% oxygen and a carbon monoxide content below 50 ppm in the atmosphere of the space
Open both bow- and stern doors
The fuel tank contents gauges onboard a vessel are of the air bubble and bell type. The gauges are calibrated for a different fuel type to the actual fuel in the tanks. When correcting the actual contents of the tanks from the gauge readings which of the parameters given in the options is the most important?
Fuel temperature.
Fuel pour point.
Fuel density.
Fuel viscosity.
When should a spreader be used for general cargo operations?
When the weight of a load needs to be evenly distributed by the lifting gear
When the length of a load is such that slinging it will create unacceptable bending moments
When the length of a load is such that slinging it will create sagging
When handling open-top containers
What name is given to the part of the discharging operation on an oil tanker when the last remaining contents of a tank or line are being pumped out?
Puddling
Purging
Lifting
Stripping
Large bulk carriers are more likely to suffer from cracks in structure in which of the following parts of the vessel?
In after peak area
In number 1 and number 2 holds
Around hatch corners and upper ballast tanks amidships
On bottom plating in the after part of the vessel
Which of the following insulation materials that are used onboard gas carriers has the highest diffusion resistance?
Mineral wool.
Polyurethane foam.
Perlite.
Air.
On a RoRo vessel, what factor(s) determine whether or not a cargo unit will tip over?
The length and width of the cargo unit
The width of the cargo unit
The shape and centre of gravity and securing arrangements of the cargo unit
A bulk vessel loads a full cargo to summer marks of a high density bulk cargo such as iron ore concentrate; what would be the possible stability conditions produced?
The vessel will normally have a small intact metacentric height (GM) and have a slow roll period
The vessel will normally have a large intact metacentric height (GM) and have a fast roll period
The vessel will be tender and have a poor curve of righting levers.
The vessel may have a list
What is the name of UN maritime division?
The UN maritime division is UNM (United Nations Maritime)
UN does not have any maritime division.
The UN maritime division is IMO (International Maritime Organisations)
The UN maritime division ISO (International Shipping Organisation)
A vessel which normally operates with the engine room in UMS mode is unable to do so because of defects to some of the critical alarm functions. What are the main considerations that the Chief Engineer must take into account when planning alternative arrangements to cover the engine room requirements until the defects are cleared?
A work rota is established to ensure at least one person is in the engine room at all times while the defects exist.
A work rota is established to ensure that normal routine maintenance is carried out on time in accordance with the planned maintenance schedule.
A work rota is established to ensure that the necessary repairs can be carried out as soon as possible.
A work rota is established to ensure full coverage of engine room watchkeeping duties and adequate rest periods for the engineering staff.
If you have to carry out hot work close to a smoke detector in the engine room, what precautions should be taken?
Notify Master, Deck officer and engineer in charge.The loop for the smoke detector to be switched off and take normal precautions for hot work.
Notify deck officer in charge that a fire alarm may occur.
No special precautions except for having a watch man and a fire extinguisher available.
Disconnect or cover up the smoke detector.
What is the estimated average daily calorie intake required by an active adult male?
650
4400
2900
7500
What is to be considered when deciding the position of the accommodation on an oil tanker?
They must be at the after end of the vessel.
There are no restrictions to the position of the accommodation.
A single failure of deck or bulkhead shall not allow fumes into the accommodation spaces.
There must only be one accommodation block.
How often are abandon ship drill and fire drill required to be held on passenger ships, according to SOLAS?
Every second week
Every third week
Weekly
Once a month
What is the purpose of watertight doors?
They will be closed during a fire to prevent the smoke and fire to spread to other parts of the ship.
They will be closed from the bridge or locally in case of damage on the ships hull, and taking in water.
They will be closed if the ship get a damage on the ships hull, and taking in water. It will prevent the water to fill the whole deck. In case of fire they can also be used to stop the fire and smoke from diverge.
They are doors in engine area which will be closed during navigation in shallow waters.
What arrangement may be installed in passenger ships to reduce unsymmetrical flooding in damaged condition?
Self acting ballast trimming arrangement
Cross flooding arrangement
Separate trim tanks
Ballast trimming system
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