COMPETENCY 11
Ship Stability and Damage Control Quiz
Test your knowledge on ship stability, watertight integrity, and damage control with our comprehensive quiz. This quiz features 75 multiple choice questions designed for maritime professionals and students looking to reinforce their understanding of critical concepts related to ship operations.
- Cover all aspects of SOLAS regulations.
- Challenge yourself with complex scenarios.
- Perfect for certification preparation and continuing education.
As per SOLAS Chapter II-1, what is the regulation with regards to power-operated watertight doors?
Local control opening and closing permanently installed chain gears
All the power-operated watertight door must be capable of closing simultaneously from bridge in not more than 25 seconds when the ship is in upright condition
Watertight doors can be operated either locally or remotely from the bridge.
Power-operated sliding doors should be provided with a local audible alarm similar to a ship’s general alarm
If the pump capacity exceeds the flooding rate, what must be done first?
The pumping shall be continued, and the pump shall be kept in a permanent stand-by mode and ready for use, at any time
Stop the pumping and let the compartment reach partial flooding
The compartment must be isolated by closing all watertight access including valves in the piping system
Keep one watertight access open so that water can either run into or out of the flooded compartment
What should be observed concerning a ship’s watertight integrity?
All emergency exit doors locked and secured
The ramp in stowed position
That all vessel’s watertight ramps and doors are locked and secured at sea
The aft door locked
Your vessel has run aground and is touching bottom for the first one-quarter of its length, What is the least desirable method from the standpoint of stability to decrease the bottom pressure?
Discharge forward deck cargo
Flood an after double bottom tank
Pump out water from the fore peak tank
Shift deck cargo aft
What is considered as one of the basic objectives of damage control in which an action is undertaken to reduce to the lowest level and localize the damage by taking measures to control flooding and preserves stability and buoyancy?
Minimization
Prevention
Isolation
Reduction
What requirements is needed to hold down steel hatch covers fitted with packing, either manually or hydraulically operated, to ensure water tightness of the cover?
Wedges
Cleats
Saddles
Coaming
What terms indicates a curvature of the decks in a longitudinal direction?
Flare
Sheer
Deadrise
Camber
Visual inspection, dye penetrant test, ultrasonic testing and magnetic particle testing are what type of checks on welds and metal components?
Non-destructive test
Impact test
Tensile test
Destructive test
The center of volume of the immersed portion of the hull is called the _____.
Center of gravity
Tipping center
Center of flotation
Center of buoyancy
10. What is the ship structure that extends from the engine room to the forwards holds which allows pipings to be installed beneath the hold for them to be inspected and repaired at anytime?
Duct keel
Tank top
Longitudinal girders
Double bottom
When is a rudder said to be unbalanced?
When the centerline of stock and centerline of pintles are not in the same line
When the whole of the rudder blade area is aft of the stock
When between 20% and 40% of the rudder blade area is forward of the stock
When rudder is unsupported at the bottom but supported by a gudgeon on a large rudder horn
Which of the following best describe a spade type rudder?
A rudder where the centerline of stock and centerline of pintles are not in the same line
A rudder where between 20% and 40% of its area is forward of the stock
A rudder where the whole area of the blade is aft of the stock
A rudder which is unsupported at the bottom but supported by a gudgeon on a large rudder horn and by the lower end of the stock
If a compartment is capable of preventing the passage of water in any direction under the head of water during intact or damaged condition, the compartments is said to be what?
Weather tight
Seawater sealed
Watertight
With hull integrity
Transverse watertight bulkheads serve to separate different types of cargo and to divide tanks and machinery from cargo spaces. What is another important function of watertight bulkhead?
Limits the hogging and sagging condition of the vessel
Restricts the volume of water which may enter the vessel if the shell plating is damaged
Increases the stability of the vessel
Reduces the pitching motion of the vessel
Which of the following requirements to ships stability for normal operation corresponds regulations? (NSCL 4/12,2)
Unless other says stated in the approved stability calculation, the total weight of the deck cargo shall not exceed 50 metric tons.
Water with the danger of icing, loading of deck cargo must be approved by competent authority
The ship is loaded in such a manner that adequate stability is achieved in all loading condition
Centre of gravity shall be calculated with an accurancy better than 5 percent
When a ship meets heavy weather and commences heaving and pitching, what is known as the tremendous slamming effect when the fore end re-enters the water?
Pounding
Wave bending
Racking
Panting
If the cause of severe list is off-center ballast, counter flooding into empty tanks will_____.
Decrease list
Increase the righting moment
Increase the righting arm
Increase list
When is a rudder said to be balanced?
When between 20% and 40% of rudder blade area is forward of the stock
When the whole of the rudder blade area is aft of the stock
When the centerline of stock and centerline of pointless are not in the same line
When the rudder is unsupported at the bottom but supported by a gudgeon on a large rudder horn
If a fire breaks out in the cargo hold upper “tween decks of a ship, what dangerous condition may occur in putting out the fire using water which has accumulated?
The water will immediately accumulate at the hold tank top and damage the lower cargo
All cargo in that hold would get damaged
The stability of the ship will be reduced due to added mass of water and bu. Free surface effect
The accumulated water will be difficult to remove
For what purpose are anchor cable stoppers?
To stop the anchor chain while in the process of lowering or heaving the anchor
To lock and secure the anchor chain in any position to relieve the load from the windlass
To adjust the anchor chain link position to the compression bar if there is clearance between them
To be used as an emergency stopping device if the windlass brake fails
Transverse stability calculations requires the use of_____.
Hydrostatic curves
Hog og sag calculations of tables
Cross sectional views of the vessel
General arrangements plans
Buoyancy is a measure of the ship’s______.
Ability to float
Deadweight
Mid ship strength
Freeboard
What is the real danger of progressive flooding due to ruptured seawater line in an enclosed compartment?
Ship staff will not be able to access the compartment unless the leakage is isolated
The ship will be in sagging condition and eventually break
In time, the pressure within the compartment will gradually. Get high and cause previously. Undamaged bulkheads to collapse.
This condition will cause an immediate sinking of the vessel
SOLAS-approved Type C watertight door is to be kept closed all the time. However, it may be opened during which condition?
May be left open and to be closed only during emergency
When personnel are only passing through the door of the compartment
Can be opened only during an emergency
Can be kept open while personnel are working in the adjacent compartment
Your vessel is damaged and partially flooded, It is listing 12 deg to port and trimmed 8 feet down by the head, it has a long, slow, sluggish roll. Which action should you take first?
Press up an and after, slack, centerline, double bottom tank
J
Pump out water from the forepeak tank
Jettison the anchor and anchor cables
What major type of flooding in which an intact compartment is not completely flooded and that the deck on which the water rest and bulkheads that surround it remain watertight?
Solid flooding
Partial flooding
Seawater level flooding
Restricted flooding
Undercut, slag inclusion, brittle fracture, and porosity are common faults in welded joints. What is the meaning of ‘undercut’?
There is a gap on the finished welding joint
It is the incomplete penetration of welding of joint
The edge of the plate in way of the weld side is burned away
Bubbles of air are trapped in the weld
For any given ship’s displacement, the volume of water displaced must depend upon the density of water. If a ship moves from sea water into river water without change in displacement, what is the effect on the draught?
No change in draught
Slight increase in draught
Slight decrease in draught
Large increase in draught
Which would not provide extra buoyancy for a vessel with no sheer?
Light draft
Raise poop
Raise forecastle
Higher bulwark
The water in which a vessel float provides vertical upward support. The point through which this support is assumed to act is known as the center of______.
Buoyancy
Effort
Gravity
Floatation
What is meant by “flooding to sea level”?
Flooding of a ship that is in fully loaded condition
Flooding of a compartment that is open to sea
Flooding due to ruptured sea waterline inside a compartment
Flooding of lesser height than sea water level
The kind of local stress that is due to the hammering effect of the fore end of the ship head on to the sea in light condition is the_____.
Pounding
Engine vibration
Panting
In order to improve stability, which of the following should be done?
Consume fuel from a fuel tank
Close the watertight doors
Load cargo on deck
Fill in ballast
When a mass of cargo is added, removed, or moved longitudinally, the ship’s trim changes. At what point on the water plane or axis about which the trim changes?
Center displacement
Center of gravity
Amidships
Center of floatation
Your vessel is damage with no list, but down by the stern. There is progressive flooding and trim by the stern is increasing. What is the effect on transverse stability after the deck edge at the stern is submerged?
KB decreases from loss of water therefore GM
BM decreases from loss of water plane and greater volume
There is no effect on transverse stability
KG increase due to the weight of the added water on deck
Where are panting stringers fitted?
Aft of the collision bulkhead
Forward of the collision bulkhead
Around anchor chain lockers
Forward tank top
What result can be calculated by periodical checking of the soundings of the damaged compartments and comparing it with draft readings?
Water ingress and flooding rate
Sagging rate of the vessel
Trim of the vessel
Hogging rate of the vessel
What is the term for `The upthrust exerted by the water on the ship?
Displacement
Ton per centimeter immersion
Buoyancy
Deadweight
What is the important purpose of solid plates known as bulwarks?
Provided added transverse strength to the web frames
Prevent personnel from falling or being washed overboard
Provide added longitudinal strength to the shell plating
Prevent waves from direct deck exposure and splashing
What is the ship structure installed around the main engine lube oil sump tank, separating it with other double bottom tanks, mainly for access for engineers in doing inspection of holding down bolts and chalks of main engine?
Tank side bracket
Cofferdam
Side frames
Drain tank
In ship construction, Which strength members act to support the decks?
Pillars
Girders
Longitudinal
Bulkhead
Which of the following is not included in the water tight doors to be met during construction as provided in the “International Load Line Convention”?
Gasket be installed at door frames
Be watertight both sides
Be constructed in steel
Be constructed in watertight plastic material
The water in which a vessel floats provides vertical upward support. The point through which this support is assumed to act is known as the center of _____.
Flotation
Buoyancy
Gravity
Effort
What happens when an unisolated saltwater line leading through a secured compartment has been ruptured and has caused the space to become completely flooded without direct access to the sea?
Progressive flooding
Instant flooding
Controlled flooding
Unknown flooding
If a ship displaces 12,240 cu.mtrs of sea water at a particular draught what is the corresponding displacement value of the ship?
13,000 MT
12,546 MT
12,240 MT
10,546 MT
The local stress that is cause by the head resistance due to the work of the bow in and out in a seaway is called______.
Engine propulsion
Deck cargoes
Pounding
Panting
Hatch corners should either be radius or elliptical. Why is this so?
To avoid section discontinuity
To reduce material stresses
To avoid torsion of hatch coamings
To ensure bulk cargo are well protected
Which ship has the greatest free surface effect such that the storage of cargo has to be accurately planned?
Ro-ro/passenger vessel
Capesize bulk carrier
LNG carrier
Oil tanker
What is the shipboard term form “the mass required to increase the mean draught of a ship by 1 cm?
Cu.mtrs Per centimeter immersion
Kg Per Cu.mtrs immersion
Tonne per Centimeter immersion
Volume Per Centimeter immersion
What compartment condition exist when the deck on which the water rest and the bulkheads that surrounds it remain watertight so that water will neither run into nor out of the flooded compartment as the ship rolls?
Segregated compartment
Rigid compartment
Intact compartment
Damage compartment
What is the ship structure that provides a form of protection in the event of damage to the bottom shell, not intended for cargo,but may be used for the carriage of oil, fuel, fresh water, and water ballast?
Tank top
Top side tank
Watertight compartment
Double bottom
What type of watertight door moves in a horizontal or vertical motion parallel to the plane of the door?
Dog lever closing type
Type A
Sliding type
Hinge type
Bilge keels reduce a ship’s tendency to roll’ Where are bilge keels fitted?
Above the line of the bottom shell protruding the breadth of the ship
Just after the transition radius of the bottom shell of the ship’s hull
Above the line of the bottom shell and within the breadth of the ship
Just before the vertical bottom of the ship’s hull
The shearing stress on a ship’s structure are usually greatest at____.
Midships
The stern
The bow
The ship’s quarter-length points
When a vessel has a positive stability, the distance between the line of force through B and the line of force through G is called the_____.
Metacentric radius
Righting arm
Righting moment
Metacentric height
Intact buoyancy is a term used to described_____.
An intact space which can be flooded without causing a ship to sink
An intact space below the surface of a flooded area
The space at which all the vertical upward forces of buoyancy are considered to be concentrated
The volume of all intact spaces above the water line
When opening a watertight door to check a compartment suspected of flooding, which of the dogs should you back-off first?
3
4
2
1
Collision bulkhead is a heavy duty watertight bulkhead in the forepart of the vessel to withstand damage after impact from collision. From which part of the vessel does this extends?
From the ship’s bottom to the main deck or upper deck
From the tank top continuous up to the first stringer
From the ship’s bottom up to the fully loaded forward draught level
From the ship’s bottom up to the ballast condition waterline level
How is the watertight integrity of a bulkhead maintained when an electric cable pipe passes through it?
By fitting a watertight cable gland with neoprene packing
By cementing the gap between the pipe and the bulkhead plate
By fitting rubber sheet between the cable pipe and bulkhead hole to absorb vibrations
By ensuring a properly welded cable pipe on both sides of the bulkhead plate
What major type of flooding in a compartment that is completely filled from deck to overhead which have taken place due to venting through an air escape, an open scuttle, or a ventilation fitting, and has no other effect than to add weight at the center of gravity of the ship?
Solid flooding
Uncontrolled flooding
Partial flooding
Progressive flooding
What structure is constructed in a deep tanks for oil fuel or oil cargo in order to avoid damage whenever they have a free surface?
Anti-sloshing bulkheads
Heeling tanks
Transverse plates
Lightening holes
What do you call the weights of the hull, machinery, spare parts and boiler water of a vessel measured in the floating dock after its construction?
Gross tonnage
Light displacement
Net tonnage
Dead weight
If a ship will be ballasted to float at draughts of 6,0 M forward and 5.5 M aft, what would be the resulting condition of the ship?
Trim by the stern or aft condition
Sagging trim condition
Hogging trim condition
Trim by the head or bow condition
In still water bending, if the ship’s buoyancy amidships exceeds the weight, this may be likened to a beam supported at the center and loaded
The ship will sag
The deck plating will be in compression
The ship will hog
The bottom shell plating will be in tension
What is termed as the total weight of the ship’s hull, machineries, spare parts, boiler water, fresh and ballast including the full weight that can be loaded?
Loaded displacement
Fresh water allowance
Net tonnage
Dead weight ton
What is considered as one of the basic objectives of damage control in which all practical preliminary measures are taken, such as, maintaining watertight integrity, providing reserve buoyancy and stability before damage occurs?
Minimization
Restoration
Preservation
Prevention
What is considered as one of the basic objectives of damage control in which an actions is undertaken to accomplish emergency repair as quickly as possible or to rectify after occurrence of damage so as to regain a safe margin of stability and buoyancy?
Prevention
Restoration
Consideration
Reduction
The principal action in changing from transit to survival draft in the event of heavy weather threatens is____.
Ballasting
Deballasting
Hanging
Disconnecting
Penetrations and openings in watertight bulkheads in a vessel of less than 100 gross tons must____.
Incorporate approved sluice valves
Be kept as high and as far inboard as practicable
Only be place in transverse watertight bulk heads that extend to the bulkwarkdeck
Be provided with no-packed slip joints for expansion to permit passage of piping of electric cable
If the amount of water ingress or flooding rate exceeds the available pump capacity, what must be done first?
The pumping out shall be continued and nothing else
Keep one or two watertight access open so that water can either run into or out of the flooded compartment
Stop the pumping out and let the compartment reach solid flooding
The compartment must be isolated by closing all watertight access including valves in the piping system
Why is a bulbous bow fitted at the forward of a ship?
It increases the ship’s efficiency at lower speed range
It reduces drag and thus increases the ship’s speed
It increases the hull wave-making resistance of a ship
It reduces the rolling motion of the ship
What is the maritime term for the size and strength of structural elements, the dimension of the ship frames, girders, stiffeners and plates?
Shipbuilding structural design
Tonnage rules
Scantlings
Ship strength
In still water bending, if the weight amidships exceeds the buoyancy, it is equivalent to a beam supported at its end and loaded at the center. What happens to the ship at this condition?
The deck plating will be in tension
The ship will sag
The bottom shell plating will be in compression
The ship will hog
What is the term for ‘the mass of the ship which is equal to the mass of the volume of water displaced by the ship when it is floating freely at rest?
Deadweight of the ship
Buoyancy of the ship
Displacement of the ship
Weight of cargo of the ship
Your vessel is damage and partially flooded. It is listing 12* to port and trimmed 8 feet down by the head. It has long, slow, sluggish roll, Which action should you take first?
Pump out the fore peak tank
Jettison the anchors and anchor cable
Press up and after, slack center line double bottom tank
Jettison deck cargo from the port side
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