seam midterm
問題一覧
1
Which of the following is the point where all the vertically downward forces of weight are considered to act?
Center of Buoyancy
2
How would you name the geometric center of the volume of the immersed portion of the vessel's hull?
Center of Buoyancy
3
Which of the following below is caused by the pressure exerted by the fluid on an immersed object?
Buoyancy force
4
The buoyancy force always points pressure of a fluid increases with depth.
upwards
5
According to the Law of Archimedes, a floating body displaces its own weight of water. Which of the following shall be equal to the weight of the displaced water?
Weight of the vessel
6
How would you measure a ship's height of the Center of Buoyancy (B)?
It is measured up from the baseline or keel.
7
Which of the following increases and decreases as draft increases and decreases respectively?
KB or VCB
8
When a ship is upright, where shall a Center of Buoyancy (B) be located in a transverse direction?
a.
b.
d.
It will be on the centerline
9
Which of the following has a fundamental purpose of allotting a maximum legal limit up to which a ship can be loaded by cargo?
Load line
10
It is the fresh water load line in Tropical marked above the Tat an amount equal to FWA?
TF - Tropical Fresh Water
11
A ship designed to carry only liquid cargoes in bulk, and in which cargo tanks have only small access openings, closed by watertight gasketed covers of steel or equivalent material is known as:
Type 'A' vessel
12
Which of the following types of vessel has an LBP of between
100 and 150 m and required to survive the flooding of any single compartment (excluding the machinery spaces?
Type (B-60) vessel
13
It is marked 50mm below the Winter load line applied to voyages in North Atlantic (above 36 degrees of latitude during winter months
WNA - Winter North Atlantic
14
Which of the following refers to the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water (or vice versa) when floating at its loaded draft?
Fresh Water Allowance
15
Which of the following is the weight that must be loaded or discharged to change a ship's mean draft in sea water by one centimeter?
Tons Per Centimeter
16
How would you calculate the Volume Displacement of a box-shaped vessel?
Vol. Displacement = Length × Breadth x Draft
17
The
of a ship is the number of millimeters by
which the mean draught changes when a ship passes from salt water to dock water, or vice-versa, when the ship is loaded to the summer displacement.
Dock Water Allowance (DWA)
18
What would happen to a ship's draft when ship moves into water of greater density?
Draft decreases
19
A vessel floats at a drafted of 12.5 m in water density of 1,005 kgs/cu meter. If her FWA is 187 mm, calculate for her draft on passing into the salt water.
12.35 m
20
The vessel has a Weight Displacement of 16,800 tons with a TPC of 22.28, Find the FWA in millimeters (mm)
189 mm
21
Which of the following shall you use to determine the Fresh Water Allowance (FWA) in inches?
FWA = Weight Displacement/40 x TPI
22
A vessel is in water density of 1,022 kgs/m° has a draft of 9.82 m, FWA of 198 mm. She is to enter a port having a density of 1,010 kgs./m*. Find the DWA in meter.
0.09504 m
23
Which of the following is equal to the product of the righting lever and the displacement?
Moment of Statical Stability
24
The force of buoyancy acts vertically upwards through the Centre of buoyancy and the weight of the ship acts vertically downwards through the Centre of gravity. What is produced by these two equal and opposite forces that may tend to right or capsize the ship?
Moment or couple
25
At small angles of heel (15° and below), the force of buoyancy may be considered to act vertically upwards through a fixed point called the____.
Initial Metacenter (M)
26
Which of the following is known as the righting arm or lever denoting as the perpendicular distance between the vertical through G and the vertical through B1?
GZ
27
Which of the following is the difference between the height of the metacenter above keel and the height of the center of gravity above the ship's keel?
Metacentric Height
28
Which would you use in finding the Moment of Statical Stability or Righting Moment when ship is heeled to 15° and below?
Moment of Statical Stability = W x GZ
29
Which of the following would you use in finding the Moment of Statical Stability when the angle of heel is 15° and below?
Moment of Statical Stability = W x GM x sin 0°
30
A vessel is said to be which of the following when she is inclined by an external force such as wind or wave?
Heeled
31
Which of the following would you use in finding the GZ when the angle of heel is more than 15°?
GZ = (GM + ½ BM tan? 0) sin 0
32
A box-shaped vessel of 4,200 tons displacement has a GM of
0.5 m, a beam of 15 m, and floats at a draft of 4 m. Find the Moment of Statical Stability at 25° of heel where BM = B4/12 Draft.
1,792.50 tons meter
33
A vessel has a Stability moment of 11,250 tons-meter and a righting lever of 0.68 m. Solve for her displacement in tons.
16,544.12 tons
34
Your vessel displaces 21,500 tons with her Height of Metacenter above keel of 31.4 ft. and her Height of the Center of Gravity above keel of 25 feet. What would her righting arm be at an angle of heel of 10°?
1.11 ft
35
When a ship of 12,000 tons displacement is heeled by 5°25' her Moment of Statical Stability is 300 tons-meter and her KG is 7.5 m. Solve for her metacentric height (GM) and the height of the metacenter above the keel (KM)
0.265 m, 7.77 m
36
Which of the following is the stability at small angles of inclination up to 15° since the metacenter is considered to be fixed?
Initial Stability
37
Which of the following equilibrium conditions describes the ship's tendency to return to her upright condition when inclined and possesses a positive metacentric height (GM)?
Stable equilibrium
38
What equilibrium condition will occur when M is below the ship's G thereby having a negative GM and loll, and would tend to capsize due to capsizing moment?
Unstable equilibrium
39
Which of the following is not included in the criteria where ship has possessed a neutral equilibrium?
Has positive GM with M above G
40
What condition of the ship will occur when she has small GM and GZ, slow and easy motion, slow roll, long roll period and with high KG?
Tender
41
Which of the following is not included in the criteria of a "stiff" ship?
Top heavy where G is high
42
In a small angle of heel, the ship's metacenter (M) is located at the intersection of the inclined vertical centerline and a vertical line through which of the following?
Center of Buoyancy (B)
43
Stability is determined mainly by the location of two points in a ship: the Center of Buoyancy (B) and the ____.
Center of Gravity (G)
44
The vertical distance between the ship's Center of Gravity (G) and Metacenter (M) is used as a measure of which of the following?
Initial Stability
45
Which statement is correct for a tender vessel?
Her rolling period is long
46
Which of the following is the purpose of the responsible officer in lowering the effective Center of Gravity of the vessel when the she is much easier to incline and will not tend to return so quickly to the initial position?
Increase the GM
47
Which of the following is the typical working GM value for single-hull Oil Tankers?
0.5m - 2.0 m
48
Which of the following may occur when the initial metacentric height (GM) and righting lever of the ship become negative?
Angle of Loll
49
Which of the following does not belong to the remedial actions taken to correct vessel having an angle of loll?
Adding weight in the maindeck
50
What is the value of righting lever/arm at an angle of loll?
Zero
51
What would the righting moment become when ship has an angle of loll?
Zero
52
What would the upsetting/capsizing moment become when ship has an angle of loll?
Zero
53
You found out that your vessel has taken up a list due to negative metacentric height (GM). Which of the following is your best action to take in lowering the ship's G below M?
Stow weight symmetrically below G
54
Which of the following types of stability would a ship have when the height of the metacenter (KM) is lesser than the height of the center of gravity (KG)?
Negative
55
If the height of the metacenter (KM) has similar value with the height of the center of gravity (KG), the metacentric height is equal to which of the following?
Zero
56
An unstable upright equilibrium position on a ship means that the ship's metacenter (M) is:
lower than the ship's center of gravity (G)
57
When the height of the metacenter is the same as the height of the center of gravity, the upright equilibrium position is known as:
Neutral
58
Your vessel has a negative GM and any external force applied to your vessel will cause her to start heeling. Which of the following will not happen as she heels and when your ship's KB is still the same?
Her KM decreases
59
At some angle of heel such as 15°, your ship's KM has increased and eventually equal to KG making your vessel's GM equal to zero. What may result when this condition occurs?
The vessel goes to neutral equilibrium
60
What angle of heel is produced when G has the same height as M, no GZ and capsizing or righting moment exist and the new buoyancy force(B1) is vertically below the Center of Gravity (G)?
Angle of Loll
61
The peak of a statical stability curve indicates the two quantities. Which of the following is the other inaddition to the Maximum Righting Arm?
The Angle of Maximum Stability
62
What is the angle of heel up to which the rate of increase of GZ with heel is increasing.
Angle of contraflexure
63
What means the tendency of the vessel to return to its original trim after being inclined by an outside force?
Longitudinal stability
64
What are graphical presentations showing the value of the righting arms at various angles of inclinations and at various displacements?
Statical stability curves
65
As the angle of heel increases, there comes a point when the deck of the ship immerses. This angle is called
Angle of deck immersion
66
What is used to measure the ship stability at large angles of heels?
curve of statical stability
67
What is the the distance between the origin and point of vanishing stability is called?
Range of stability
68
What is the angle of heel at which the righting lever returns to zero?
Vanishing Stability
69
What is the point of intersection of the tangent drawn to the curve at the initial point and a vertical through the angle of heel of 57.3° (1 radian).
Initial metacentric height
70
What will happen when a vessel reaches a heel equal to its point of vanishing stability?
The vessel will capsize
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19問 • 1年前問題一覧
1
Which of the following is the point where all the vertically downward forces of weight are considered to act?
Center of Buoyancy
2
How would you name the geometric center of the volume of the immersed portion of the vessel's hull?
Center of Buoyancy
3
Which of the following below is caused by the pressure exerted by the fluid on an immersed object?
Buoyancy force
4
The buoyancy force always points pressure of a fluid increases with depth.
upwards
5
According to the Law of Archimedes, a floating body displaces its own weight of water. Which of the following shall be equal to the weight of the displaced water?
Weight of the vessel
6
How would you measure a ship's height of the Center of Buoyancy (B)?
It is measured up from the baseline or keel.
7
Which of the following increases and decreases as draft increases and decreases respectively?
KB or VCB
8
When a ship is upright, where shall a Center of Buoyancy (B) be located in a transverse direction?
a.
b.
d.
It will be on the centerline
9
Which of the following has a fundamental purpose of allotting a maximum legal limit up to which a ship can be loaded by cargo?
Load line
10
It is the fresh water load line in Tropical marked above the Tat an amount equal to FWA?
TF - Tropical Fresh Water
11
A ship designed to carry only liquid cargoes in bulk, and in which cargo tanks have only small access openings, closed by watertight gasketed covers of steel or equivalent material is known as:
Type 'A' vessel
12
Which of the following types of vessel has an LBP of between
100 and 150 m and required to survive the flooding of any single compartment (excluding the machinery spaces?
Type (B-60) vessel
13
It is marked 50mm below the Winter load line applied to voyages in North Atlantic (above 36 degrees of latitude during winter months
WNA - Winter North Atlantic
14
Which of the following refers to the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water (or vice versa) when floating at its loaded draft?
Fresh Water Allowance
15
Which of the following is the weight that must be loaded or discharged to change a ship's mean draft in sea water by one centimeter?
Tons Per Centimeter
16
How would you calculate the Volume Displacement of a box-shaped vessel?
Vol. Displacement = Length × Breadth x Draft
17
The
of a ship is the number of millimeters by
which the mean draught changes when a ship passes from salt water to dock water, or vice-versa, when the ship is loaded to the summer displacement.
Dock Water Allowance (DWA)
18
What would happen to a ship's draft when ship moves into water of greater density?
Draft decreases
19
A vessel floats at a drafted of 12.5 m in water density of 1,005 kgs/cu meter. If her FWA is 187 mm, calculate for her draft on passing into the salt water.
12.35 m
20
The vessel has a Weight Displacement of 16,800 tons with a TPC of 22.28, Find the FWA in millimeters (mm)
189 mm
21
Which of the following shall you use to determine the Fresh Water Allowance (FWA) in inches?
FWA = Weight Displacement/40 x TPI
22
A vessel is in water density of 1,022 kgs/m° has a draft of 9.82 m, FWA of 198 mm. She is to enter a port having a density of 1,010 kgs./m*. Find the DWA in meter.
0.09504 m
23
Which of the following is equal to the product of the righting lever and the displacement?
Moment of Statical Stability
24
The force of buoyancy acts vertically upwards through the Centre of buoyancy and the weight of the ship acts vertically downwards through the Centre of gravity. What is produced by these two equal and opposite forces that may tend to right or capsize the ship?
Moment or couple
25
At small angles of heel (15° and below), the force of buoyancy may be considered to act vertically upwards through a fixed point called the____.
Initial Metacenter (M)
26
Which of the following is known as the righting arm or lever denoting as the perpendicular distance between the vertical through G and the vertical through B1?
GZ
27
Which of the following is the difference between the height of the metacenter above keel and the height of the center of gravity above the ship's keel?
Metacentric Height
28
Which would you use in finding the Moment of Statical Stability or Righting Moment when ship is heeled to 15° and below?
Moment of Statical Stability = W x GZ
29
Which of the following would you use in finding the Moment of Statical Stability when the angle of heel is 15° and below?
Moment of Statical Stability = W x GM x sin 0°
30
A vessel is said to be which of the following when she is inclined by an external force such as wind or wave?
Heeled
31
Which of the following would you use in finding the GZ when the angle of heel is more than 15°?
GZ = (GM + ½ BM tan? 0) sin 0
32
A box-shaped vessel of 4,200 tons displacement has a GM of
0.5 m, a beam of 15 m, and floats at a draft of 4 m. Find the Moment of Statical Stability at 25° of heel where BM = B4/12 Draft.
1,792.50 tons meter
33
A vessel has a Stability moment of 11,250 tons-meter and a righting lever of 0.68 m. Solve for her displacement in tons.
16,544.12 tons
34
Your vessel displaces 21,500 tons with her Height of Metacenter above keel of 31.4 ft. and her Height of the Center of Gravity above keel of 25 feet. What would her righting arm be at an angle of heel of 10°?
1.11 ft
35
When a ship of 12,000 tons displacement is heeled by 5°25' her Moment of Statical Stability is 300 tons-meter and her KG is 7.5 m. Solve for her metacentric height (GM) and the height of the metacenter above the keel (KM)
0.265 m, 7.77 m
36
Which of the following is the stability at small angles of inclination up to 15° since the metacenter is considered to be fixed?
Initial Stability
37
Which of the following equilibrium conditions describes the ship's tendency to return to her upright condition when inclined and possesses a positive metacentric height (GM)?
Stable equilibrium
38
What equilibrium condition will occur when M is below the ship's G thereby having a negative GM and loll, and would tend to capsize due to capsizing moment?
Unstable equilibrium
39
Which of the following is not included in the criteria where ship has possessed a neutral equilibrium?
Has positive GM with M above G
40
What condition of the ship will occur when she has small GM and GZ, slow and easy motion, slow roll, long roll period and with high KG?
Tender
41
Which of the following is not included in the criteria of a "stiff" ship?
Top heavy where G is high
42
In a small angle of heel, the ship's metacenter (M) is located at the intersection of the inclined vertical centerline and a vertical line through which of the following?
Center of Buoyancy (B)
43
Stability is determined mainly by the location of two points in a ship: the Center of Buoyancy (B) and the ____.
Center of Gravity (G)
44
The vertical distance between the ship's Center of Gravity (G) and Metacenter (M) is used as a measure of which of the following?
Initial Stability
45
Which statement is correct for a tender vessel?
Her rolling period is long
46
Which of the following is the purpose of the responsible officer in lowering the effective Center of Gravity of the vessel when the she is much easier to incline and will not tend to return so quickly to the initial position?
Increase the GM
47
Which of the following is the typical working GM value for single-hull Oil Tankers?
0.5m - 2.0 m
48
Which of the following may occur when the initial metacentric height (GM) and righting lever of the ship become negative?
Angle of Loll
49
Which of the following does not belong to the remedial actions taken to correct vessel having an angle of loll?
Adding weight in the maindeck
50
What is the value of righting lever/arm at an angle of loll?
Zero
51
What would the righting moment become when ship has an angle of loll?
Zero
52
What would the upsetting/capsizing moment become when ship has an angle of loll?
Zero
53
You found out that your vessel has taken up a list due to negative metacentric height (GM). Which of the following is your best action to take in lowering the ship's G below M?
Stow weight symmetrically below G
54
Which of the following types of stability would a ship have when the height of the metacenter (KM) is lesser than the height of the center of gravity (KG)?
Negative
55
If the height of the metacenter (KM) has similar value with the height of the center of gravity (KG), the metacentric height is equal to which of the following?
Zero
56
An unstable upright equilibrium position on a ship means that the ship's metacenter (M) is:
lower than the ship's center of gravity (G)
57
When the height of the metacenter is the same as the height of the center of gravity, the upright equilibrium position is known as:
Neutral
58
Your vessel has a negative GM and any external force applied to your vessel will cause her to start heeling. Which of the following will not happen as she heels and when your ship's KB is still the same?
Her KM decreases
59
At some angle of heel such as 15°, your ship's KM has increased and eventually equal to KG making your vessel's GM equal to zero. What may result when this condition occurs?
The vessel goes to neutral equilibrium
60
What angle of heel is produced when G has the same height as M, no GZ and capsizing or righting moment exist and the new buoyancy force(B1) is vertically below the Center of Gravity (G)?
Angle of Loll
61
The peak of a statical stability curve indicates the two quantities. Which of the following is the other inaddition to the Maximum Righting Arm?
The Angle of Maximum Stability
62
What is the angle of heel up to which the rate of increase of GZ with heel is increasing.
Angle of contraflexure
63
What means the tendency of the vessel to return to its original trim after being inclined by an outside force?
Longitudinal stability
64
What are graphical presentations showing the value of the righting arms at various angles of inclinations and at various displacements?
Statical stability curves
65
As the angle of heel increases, there comes a point when the deck of the ship immerses. This angle is called
Angle of deck immersion
66
What is used to measure the ship stability at large angles of heels?
curve of statical stability
67
What is the the distance between the origin and point of vanishing stability is called?
Range of stability
68
What is the angle of heel at which the righting lever returns to zero?
Vanishing Stability
69
What is the point of intersection of the tangent drawn to the curve at the initial point and a vertical through the angle of heel of 57.3° (1 radian).
Initial metacentric height
70
What will happen when a vessel reaches a heel equal to its point of vanishing stability?
The vessel will capsize