Seam 2 30/30

通報

問題一覧

What means the angle at which the main deck will first encounter the sea?

Point of deck immersion

What has the direct relationship with a ship’s rolling period

Metacenter

In the Center of Gravity, if the solution is solvable, there are infinitely many solutions, the set of all solution is known as:

Line of action of the force

What condition which will not cause a vessel to list?

Center weight

For a suspended weight, what is the point through which the force of gravity may be considered to act vertically downward?

Point of Suspension

The CG of the body will move directly _________ the CG of any weight added.

Towards

The process of determining a vessel’s displacement begins with measuring of:

draft

The marks on the vessel with three matching sets, Port and starboard allows a ship’s displacement to be determined to the accuracy of:

0.5%

Damage and consequent flooding in the middle length increases, what stresses?

Sagging

What means the weight of the ship including cargo, passengers, fuel, water, stores, dunnage, and such other items necessary for use on a voyage?

Loaded displacement

The final corrective ¾ mean draught should be within how many mm of the true draught?

+/- 10mm

A well conducted draught survey under reasonable prevailing conditions is capable of achieving an absolute accuracy of how many percent.

+/- 0.5

What is the oldest among the technologies to measure hull stresses?

Strain Gauges

What type of strain gauges that can penetrate paint, rust and other surface obstructions?

Acoustic

What means the actual ship weight after minus with deductible weigh?

Net displacement

Flooding at the ends after damage produces trim and increases , what stresses?

Hogging

A ship with a small GM will be __________, and have a long roll period.

Tender

What will happen to a ship with excessively low or negative GM in rough weather?

Risk of capsizing

What is an application point of the resultant force of the body.

Center of Gravity

The center of gravity exists only when the force is ______________, in which case it coincide with the center of mass.

uniform

What is the maximum moment that could be applied to the vessel without causing it to capsize?

maximum righting moment

When a tank is not full it is described as:

Slack tank

Reading the draft mark of a ship, which consist of how many points of draft marks?

six points

The CG of the body will move _________ to the shift of the CG of any weight moved within the body.

Parallel

What means is the degree to which a vessel heels to either port or starboard?

Angle of List

What is the angle at which water will be able to flood deeper into the vessel?

Down flooding angle

An overly stiff vessel rolls within a ___________ , that result in high angular acceleration.

Short period

The metacentric height is normally estimated during the design of a ship but can be determined by an __________ once it has been built.

inclining test

When the center of gravity moves from directly above the center of buoyancy, there is an:

inclining moment

What is a mechanism which can cause a watercraft to become unstable and capsize?

Free surface effect

How much of a list will a vessel of 14,500 tons take after a weight of 450 tons is shifted to 35 ft across the deck? GM is 3.5 ft. (5pts)

0.5320 ø= 17° 14’ 29”

What distance will a weight of 160 tons have to be moved in order to remove a 4° list from a vessel? Displacement is 10,500 tons and GM is 4.5 ft. (5pts)

20.650 ft

Your vessel is loading 100mt of cargo onto the twin deck, 12m from the center line. Vessel displacement is 5,000mt. what is the change in the center of gravity? (5pts)

GG2= 0.24m

A cargo of 50mt crate is added 15m above the keel. Your ship displacement is 5,999t and KG is 5.5m. What is the new height of the center of gravity (KG1)? (5pts)

KG1 = 5.579m

Your vessel’s displacement is 16,000 tonnes in salt water. The DBT measure 26meters length, breadth 17 meters, is loaded with sea water, KM = 7.0 meters, KG = 6.0 meters. Calculate the free surface effect or loss of GM and effective GM. (10pts)

a. GGo = 0.682 meters KM = 7.0 m KG = 6.0 m b. GM = 1.000 m GGo = 0.682 c.GoM = 0.318 m

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