competence 11

74問 • 2ヶ月前

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If a compartment is capable of preventing the passage of water in any direction under the head of water during intact or damage condition, the compartment is said to be what ?

watertight

Where are panting stringers fitted?

Forward of the collision bulkhead

Which of the following best describe a spade type rudder ?

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

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?

Restricts the volume of water which may enter the vessel if the shell plating is damaged

Which of the following requirements to ships stability for normal operation corresponds to present regulations? (NSCL 4/12.2)

Unless othereays stated in the approved stability calculation, the total weight of the deck cargo shall not exceed 50 metric tons

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?

Light displacement

What structure is constructed in deep tanks for oil fuel or oil cargo in order to avoid damage whenever they have a free surface?

Anti-sloshing bulkheads

If a fire breaks out in the cargo hold upper 'tween decks of a ships, what dangerous condition may occur in putting out the fire using water which has accumulated?

The stability of the ship will be reduced due to added mass of water and by free surface effect.

Undercut, slag inclusion, brittle fracture, and porosity are common faults in welded joints. What is the meaning of 'undercut'?

The edge of the plate in way of the weld side is burned away

The shearing stress on a ship's structure are usually greatest at

The ship's quarter-length points

What is teh shipboard term for the mass required to increase the mean draught of a ship by 1 cm ?

Tonne per Centimeter immersion

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 standy-by-mode and ready for use, at any time

What is considered as one of the basic objectives of damage control in which an action is undertaken to accomplish emergency repair as quickly as possible or to rectify after occurence of damage so as to regain a safe margin of stability and bouyancy?

Restoration

What equipment is needed to hold down steel hatch covers fitted with packing, either manually or hydraulically operated, to ensure watertightness of the cover?

Cleats

Collision bulkhead is a heavyduty watertight bulkhead in the forepart of the vessel to withstand damage after impact from collision. from which part to which part of the vessel does this extends?

From the ship's bottom to the main deck or upper deck

If teh cause of sever list is off-center ballast, counter flooding into empty tanks will

decrease list

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

If the amount of water ingress or flooding rate exceeds the available pump capacity, what must be done first?

The compartment must be isolated by closing all watertight access including valves in the piping system

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 preserve stability and buoyancy?

Minimization

SOLAS- approved Type C watertight door is to be kept closed all the time, However, it may be opened during which condition?

When personnel are only passing through the door of the compartment

Which of the following is not included in the water tight doors to be met during construction as provided in the "Internatinal Load Line Convention"?

Be constructed in watertight plastic material

What compartment condition exist when the deck on which of 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?

Intact compartment

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 ships at this condition?

The ship will sag

What is the real danger of progressive flooding due to ruptured seawater line in an enclosed compartment?

In time, the pressure within the compartment will gradually get high and cause previously undamaged bulkheads to collapse.

As per SOLAS chapter 11-1, what is the regulation with regards to pwer-operated watertight doors?

Watertight doors can be operated either locally or remotely from the bridge

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?

Prevention

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?

Displacement of the ship

How is the watertight integrity of a bulkhead maintained when an electric cable pipe passes through it?

By fitting watertight cable gland with neoprene packing

What result can be calculated by periodical checking of the soundings of the damaged, compartments and comparing it with draft reading?

Water ingress and flooding rate

In still water bending, if the ship's bouyancy amidships exceeds the weight, this may be likened to a beam supported at the center and loaded at the ends. What happens to the ship at this condition?

The ship will hog

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

What type of watertight door moves in a horizontal or vertical motion parallel to the plane of the door?

Sliding type

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

righting arm

The local stress that is cause by the head resistance due to the work of the bow Din and outo in a seaway is called

Panting

Transversestability calculation requires the use of

hydrostatic curves

Visual inspection, dye penetrant test, ultrasonic testing and magnetic particle testing are what type of checks on welds and metal components?

Non-destructive test

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?

Double bottom

if a ship displaces 12,240 cu.mtrs of sea water at a particular draught, what is the corresponding displacement value of the ship ?

12,546 MT

When is a rudder said to be unbalanced?

When the whole of the rudder blade area is aft of the stock

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 botls and chalks of main engine ?

Cofferdam

Bilge keels reduce a ship's tendency to roll. Where are bilge keels fitted?

Above the line of the bottom shell and within the breadth of the ship

Buoyancy is a measure of the ship's

ability to float

In order to improve stability, which of the following should be done?

Fill in ballast

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?

Pump out water from the fore peak tank

What is the maritime term for the size and strength of structural elements, the dimension of the ship frames, girders, stiffeners and plates?

Scantlings

What is the term for 'the upthrust exerted by teh water on the ship'?

Buoyancy

For what purpsoe are anchor cable stoppers?

To lock and secure the anchor chain in any position to relieve the load from the windlass

Intact buoyancy is a term used to described

an intact space below the surface of a flooded area

Which would not provide extra buoyancy for a vessel with no sheer?

Higher bullwark

When a mass of cargo is added, removed, or moved longitudinally, the ship's trim changes. At what point on the waterplane or axis above which the trim changes?

Center of floatation

What term indicates a curvature of the decks in a longitudinal direction ?

Sheer

What should be observed concerning a ship's watertigh integrity?

The ramp in stowed position

Hatch corners should either be radiused or elliptical. Why is this so?

To reduce material stresses

The principals action in changing from transti to survival draft in the event of heavy weather threatens is

ballasting

Penetrations and openings in watertight bulkheads in a vessel of less than 100 gross tons must

Be kept as high and as far inboard as practicable

Your vessel is damaged 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?

BM decreases from loss of water plane and greater volume

What is the ship structure that extends from the engine room to the forward hold which allows piping to be installed beneath the hold for them to be inspected and repaired at anytime?

Duct keel

Which ship has the greatest free surface effect such that the storage of cargo has to be accurately planned?

Oil tanker

When a ship meets heavy weather and commences heaving and pitching, what is known as the tremendous slamming effect when teh fore end re-enters the water?

Pounding

In ship construction, which strength members act to support the decks?

Girders

Why is a bulbous bow fitted at the forward of a ship?

it reduces drag and thus increase the ship's speed

When is a rudder said to be balanced?

When between 20% and 40% of rudder blade area is forward of the stock

What is the important purpose of solid plates known as bulwarks?

Prevent personnel from falling or being washed overboard

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 head or bow condition

The center of volume of the immersed portion of the hull is called the

center of buoyancy

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

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?

Dead weight ton

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 escpae, 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

What major type of flooding in which an intact compartment in not completely flooded and that the deck on which the water rest and bulkheads that surrounds it remain watertigh?

Partial flooding

Your vessel is damaged and partially flooded. It is listing 12° 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 and after, slack center line double bottom tank

When opening a watertight door to check a compartment suspected of flooding, which of the dogs should you back-off first?

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

buoyancy

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 without change in displacement, what is the effect on the draught?

Slight increase in draught

The kind of local stress that is due to the hammering effect of the fore end of the ship head on the sea in light condition is the

pounding

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