Kontruksi dan Stabilitas Kapal multiple Choices
Konstruksi dan Stabilitas Kapal Ujian Diklat English Version
1. For a container stowed in a position equidistant from the roll and pitch axes of
a ship, what will quarter the acceleration forces acting on it?
A. Havling the roll period
B. Doubling the pitch period ✔️
C. Doubling the roll period
D. Halving the pitch period
2. How are ship's stability characteristics affected by Parametric Rolling?
A. By the virtual loss of GM✔️
B. By the constant change of underwater hull geometry as waves
travel past the ship
C. By the development of a negative GM
D. By an increase in the angle of pitch
3. What does heaving result in?
A. Vertical accelerations acting along container corner posts
B. Shearing of container twist locks✔️
C. Longitudinal accelerations acting on hatch pontoons
D. Tipping of containers
4. What is the disadvantage of using High Tensile Steel (HTS) in ship construction?
A. Low elasticity
B. Failure without warning
C. Enhanced vibration in HTS areas✔️
D. Diminished cargo carrying capacity
5. What is the primary cause of fatigue damage to the hull girder?
A. The number of repeated stress cycles ✔️
B. Repeated plastic deformation of the hull
C. Panting stresses
D. Resonant rolling
6. What roll amplitude is generally used by classification societies in calculating rolling forces?
A. 18 - 24 degrees
B. 37 - 42 degrees
C. 30 - 36 degrees
D. 24 - 30 degrees ✔️
7. What would indicate the onset of Parametric Rolling?
A. When the wave encounter period approaches the natural roll period of the ship ✔️
B. When twice the wave encounter period approaches the natural roll period of the ship
C. When wave heights experienced from either quarter exceed 6 meters
D. When wave heights experienced from the bows exceed 6 meters
8. When do vertical accelerations acting on containers reach their maximum values?
A. When a ship surges
B. When a ship is at its extreme angle of pitch and roll simultaneously
C. When a ship changes direction at its extreme angle of pitch✔️
D. During resonant rolling
9. When does wind force cause heeling moments on a container ship?
A. When the on-deck containers present a certain profile to the wind direction ✔️
B. Whenever wind speeds exceed 60 knots
C. Whenever wind speeds exceed 70 knots
D. When on-deck containers are block-stowed
10. Why would a very large container vessel pitch more than a feeder vessel?
A. Because vessel pitching varies with propeller pitch
B. Because very large container vessels are more exposed to open sea
C. Because pitching varies with ship‘s length✔️
D . Because container stacks on large container vessels are more
exposed to wind forces
11. A Bulk Vessel is to load a cargo of grain; pre loading calculations show that IMO
stability criteria cannot be achieved; the vessel should do which of the following?
A. The cargo can still be loaded
B. The grain surfaces in some or all of the cargo spaces must be secured ✔️
C. An exemption certificate must be applied for
D. An exemption certificate must be applied for
12. A loaded bulk carrier experiences heavy ice accretion on deck forward, what are the major concerns of the changes in stability?
A. Reduction of metacentric height (GM) and loss of freeboard forward ✔️
B. Excessive trim by the stern
C. Increase in metacentric height (GM)
D. Reduction of speed and additional fuel consumption
13. After discharging a high density cargo a serious crack is found in an upper ballast tank amidships of a Bulk Carrier; what must the Master do?
A. Repair with cement box or temporary welded patch until next dry dock.
B. Note the dimensions of the crack and measure regularly
C. Proceed on ballast voyage without ballast in this tank
D. Inform Designated Person Ashore (DPA) and call in Classification Society ✔️
14. In a single side skin bulk carrier of 180m in length constructed in 2001 and carrying cargo of density 1,780 kg/m3, or above, which cargo hold is strengthened to withstand flooding?
A. The foremost cargo hold ✔️
B. The aftermost cargo hold
C. The amidships cargo hold
D. The ballast hold
15. Large bulk carriers are more likely to suffer from cracks in structure in which of the following parts of the vessel?
A. In after peak area
B. In number 1 and number 2 holds
C. Around hatch corners and upper ballast tanks amidships ✔️
D. On bottom plating in the after part of the vessel
16. On a hold inspection of a Bulk Carrier it is noted that a number of transverse frame beam knees are slightly distorted; what is the significance of this?
A. This indicates the vessel is suffering racking stress and is potentially serious, ✔️
B. There are no concerns with this observation
C. This is an indication of excessive bending moment stress
D. The distorted areas should be painted
17. The vessel is instructed to load alternate holds when chartered to carry a high density cargo. What reasons could be given by the master to refuse to do this?
A. The trim of the vessel will not be satisfactory.
B. IMO do not recommend alternate loading of cargo holds with high density cargoes.✔️
C. Cargo space cleaning after discharge will be excessive.
D. The summer deadweight will not be achieved
18. Which type of material is normally used in the construction of a cargo tank designed for transporting LPG at atmospheric pressure?
B. 9% Nickel steel.
C. Stainless steel.
19. What arrangement may be installed in passenger ships to reduce unsymmetrical flooding in damaged condition?
A. Cross flooding arrangement✔️
B. Ballast trimming system
C. Separate trim tanks
D. Self acting ballast trimming arrangement
20. What is the full name of the International Convention dealing with stability of passenger ships?
A. International Safety Management code
C. The International Convention for the Safety of Life at Sea✔️
21. What is the result of a large metacentric height?
A. The ship will roll violently.✔️
B. The ship will have a long roll period.
C. Bending moment will increase.
D. The center of gravity will move upwards.
22. Who is responsible for maintaining the vessel's structural strenght?
A. The Shipyard
B. The Shipping Company and the Classification Society
C. The Flag State Administration
D. The Master✔️
23. When cross-flooding arrangements to correct unsymmetrical flooding and excessive heel angels in damaged condition are installed in passenger ships, what is the maximum angle of heel after flooding but before equalization?
A. 30 degrees
B. 10 degrees
C. 20 degrees
D. 15 degrees✔️
24. How is the size of a reefer vessel normally referenced?
A. By the pallet capacity.
B. By the cubic foot capacity.✔️
C. By the grain capacity.
D. By the Suez Canal tonnage.
25. Where are cargo hold water level detectors required to be fitted on bulk carriers?
A. At the after end of each cargo hold✔️
B. At the forward end of each cargo hold
C. In cargo hold bilges
D. At the port and starboard midship sections of each cargo hold
26. If properly secured what benefits do high sided car carriers have over other ship types regarding seaworthiness?
A. They can roll to very large angles without taking in water✔️
B. They are not easily damaged in heavy weather
C. Their large reserve buoyancy prevents capsizing
D. They can pitch to very large angles without taking in water viathe ramp doors
27. On a roro vessel, in addition to longitudinal, transverse and vertical accelerations what else must be taken into account when calculating the external forces acting on a cargo unit?
A. Longitudinal and transverse forces by wind pressure ✔️
B. Longitudinal and vertical forces by wind pressure
C. Vertical and transverse forces by wind pressure
D. Longitudinal forces by sea sloshing
28. What special design feature is attributed to roro vessels which are only car carriers?
A. Solid ballast
B. A stern ramp
C. A very large windage area✔️
D. A small GM when fully loaded
29. When will a ro-ro vessel pitch heavily?
A. When wave lengths are equal to the ship's length✔️
B. When wave lengths are equal to twice the ship's length
C. When wave lengths are equal to half the ship's length
D. In confused seas
30. The side to side, bodily motion of a vessel is known as