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Stability > Exam 1 Prac. Problems > Flashcards

Exam 1 Prac. Problems Flashcards

1
Q

A homogeneous coargo completely fills a cargo hold. How would you estimate the center of gravity of that cargo hold?
I. It would be equal to the geometric center of the cargo hold.
II. Take moments of the various cargoes and divide them by the total weight in the cargo hold.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I (It would be equal to the geometric center of the cargo hold.)

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2
Q

Metacentric height method of expressing stability tendency is useful for:
I. Small angles of inclination
II. Large angles of inclination

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I

I. Small angles of inclination

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3
Q

A seesaw will not balance. we wish to determing where to put the fulcrum in order to make it balance. which of the following ethods would you use? You are not allowed to change the distribution of weight.
I. Revolve moments about a shifting fulcrum.
II. Revolve moments about one end of the seesaw only

A. I
B. II
C. Either I or II
D. Neither I nor II

A

B. II (Revolve moments about one end of the seesaw only)

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4
Q

Center of buoyancy by its definition can be considered:
I. The centroid of the displaced volume.
II. The resultant of all vertically upward forces of buoyancy.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

I. The centroid of the displaced volume.
II. The resultant of all vertically upward forces of buoyancy.

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5
Q

A small angle of inclination for a typical merchant form vessel is usually no more than about:

A. 3 degrees
B. 5 degrees
C. 10 degrees
D. 20 degrees

A

C. 10 degrees

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6
Q

As draft increases in a vessel, that values of KB and BM are changing. Explain how combintation of KB and BM affects KM as:
Draft increases at near full load displacements

A. KB increases faster than BM increases
B. KB increases faster than BM decreases
C. KB increases slower than BM decreases
D. KB increases slower than BM increases

A

B. KB increases faster than BM decreases

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7
Q 
It is assumed that a typical merchant form hull will have its metacenter behave similarly to that of a vessel with a cylindrical cross section during which of the following conditions:
A. Any angle of inclination
B. Small angles of inclination only
C. Large angles of inclination only
D. None of the above
A

B. Small angles of inclination only

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8
Q

A decrease in block coefficient necessarily means an increase in flare.
A. True
B. False

A

B. False

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9
Q

KM can be obtained by the ship’s officer from:
I. The ship’s stability booklet.
II. The ship’s capacity plan

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

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10
Q 
A ship has a quick hard roll.  the ship's stability is:
A. Tender
B. Large GM
C. Small right moment
D. All of the above
A

B. Large GM

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11
Q 
Righting arm is: 
A. A couple
B. A moment
C. A distance
D. None of the above
A

C. A distance

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12
Q 
If a marble is placed on a level table, what type of equilibrium does it possess?
A. Stable
B. Neutral
C. Unstable
D. Cannot be determined
A

B. Neutral

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13
Q 
As a vessel inclines to 3 degrees which of the following moves toward the low side? Assume inclination due to rolling.
A. B
B. G
C. M
D. All of the above
A

A. B

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14
Q

Stability by its definition can be considered:
A. Righting moment
B. Righting arm
C. The tendency for the ship to return to an upright position
D. All of the above

A

C. The tendency for the ship to return to an upright position

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15
Q 
KM minus KG equals what?
A. Metacentric height 
B. Height of metacenter
C. Metacentric radius
D. None of the above
A

A. Metacentric height

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16
Q

The GG’ formula is used to solve for:
A. The movement of G when a weight is shifted aboard a vessel
B. The movement of G when a weight is loaded aboard a vessel
C. The movement of G when a weight is discharged aboard a vessel.
D. The movement of G when a weight is suspended aboard a vessel.
E. All of the above.

A

E. All of the above

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17
Q 
By dividing the area of the water plane by the product of length and breadth you will be able to calculate:
A. Water plane coefficient
B. Tons per inch immersion
C. Volume of displacement
D. None of the above
A

A. Water plane coefficient

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18
Q 
The point through which all the vertically downward forces of weight are considered to act is known as: 
A. The metacenter
B. The center of buoyancy
C. The center of gravity
D. None of the above
A

C. The center of gravity

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19
Q

The light ship condition is:
A. A condition prior to loading cargo, but with fuel, water, and stores aboard
B. A condition prior to loading cargo and fuel, but with water and stores aboard.
C. A condition prior to loading cargo, fuel, and water, but with stores aboard
D. A condition prior to loading cargo, fuel, water, and stores.

A

D. A condition prior to loading cargo, fuel, water, and stores.

20
Q

The product of displacement and GZ is:
I. An indication of the vessel’s true stability.
II. Righting moment

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

I. An indication of the vessel’s true stability.
II. Righting moment

21
Q

Why can a righting arm be used alone as an indication of transverse stability?
I. Displacement remains constant at all angles of heel.
II. GZ remains constant at all angles of heel.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I

I. Displacement remains constant at all angles of heel

22
Q

A homogeneous cargo partially fills a cargo hold. The KG of the cargo in the compartment must be calculated by:
I. The geometry of the space.
II. The vertical cargo moment of the space divided by the total weight of the cargo in the space.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

23
Q

To calculate the KG of a roll-on-roll-off vessel:
I. Each individual unit’s weight must be multiplied by its individual KG, summed, and divided by the displacement of the ship.
II. The weight on each of the ship’s levels is summed and the total weight of the level is multiplied by an appropriate KG. The sum of these vertical moments is divided by the total displacement.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

24
Q

A moment is:
I. A weight
II. A distance

A. I
B. II
C. Either I or II
D. Neither I nor II

A

D. Neither I nor II

25
Q

If you were looking for the KB curve on a typical ship’s hydrostatic curves plan, you would expect the shape of the KB curve to be:
I. A straight line for all practical purposes
II. A gently curving line.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I ( A straight line for all practical purposes)

26
Q

Center of gravity by its definition can be considered:
I. The centroid of the displaced volume.
II. The resultant of all vertically downward forces of gravity.

A. I
B. II
C. Either I and/or II
D. Neither I nor II

A

B. II

The resultant of all vertically downward forces of gravity.

27
Q

As draft increases in a vessel, that values of KB and BM are changing. Explain how combintation of KB and BM affects KM as:
Draft increases at light displacement.

A. KB increases faster than BM increases
B. KB increases faster than BM decreases
C. KB increases slower than BM decreases
D. KB increases slower than BM increases

A

C. KB increases slower than BM decreases

28
Q

The product of a length of a vessel and the cube of its breadth divided by twelve will result in:
I. the moment of inertia for a rectangular water plane area
II. The moment of inertia for a curved water plane

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I (the moment of inertia for a rectangluar water plane area)

29
Q

Mathmatically speaking a couple requires:
A. Two equal forces acting on a body in opposite directions and along parallel lines.
B. Any two forces acting on a body in any direction
C. Two equal forces acting on a body at right angles to each other.
D. None of the above.

A

A. Two equal forces acting on a body in opposite directions and along parallel lines.

30
Q 
The couple formed by the center of buoyancy and the center of gravity form what is known as:
A. Metacentric height
B. Metacentric raidus
C. Righting arm
D. Righting moment
A

D. Righting moment

31
Q 
The distance that the transverse metacenter is above the keel is designated as:
A. KG
B. KB
C. KM
D. KG + BM
A

C. KM

32
Q

KM can be obtained from:
I. Hydrostatic curves
II. A table in the ship’s stability booklet

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

I. Hydrostatic curves
II. A table in the ship’s stability booklet

33
Q

The metacenter of a typical merchant vessel will initially fall and then commence to rise as draft increases from the intial light displacement condition.
A. True
B. False

A

A. True

34
Q 
KB plus BM equals what?
A. Metacentric height
B. Height of the metacenter
C. Metacentric radius
D. None of the above
A

B. Height of the metacenter

35
Q

If KG is less than KM the ship would be considered to have:
I. Stable equilibrium
II. Neutral equilibrium.
III. Unstable equilibrium

A. I
B. II
C. III
D. None of the above

A

A. I

I. Stable equilibrium

36
Q

An increase in flare will produce an increase in KB.
A. True
B. False

A

A. True

37
Q 
By multiplying the area of the water plane by 420 you will be able to calculate: 
A. Water plane coefficient
B. Tons per inch immersion
C. Volume of displacement
D. None of the above
A

D. None of the above

38
Q 
A vessel's displacement increases but its righting arm does not.  What can be said about the vessel's righting tendencies?
A. Increase
B. Decrease
C. Remain about the same
D. Cannot be determined
A

A. Increase

39
Q

The value of KM is calculated by:
I. Adding BM to KB.
II. Subtracting BM from KB.

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I (Adding BM to KB)

40
Q 
The resistance to motion about the longitudinal axis of a ship's water plane is: 
A. I
B. V
C. B
D. M
A

A. I

41
Q 
Which of the following is the most significant dimension of the ship when calculating KM?
A. Length
B. Breadth
C. Draft
D. Freeboard
A

B. Breadth

42
Q

A heterogeneous cargo can be described as:
I. General cargo
II. A mixture of cargos with different densities

A. I
B. II
C. Either I or II
D. Neither I nor II

A

C. Either I or II

43
Q

Another expression for height of transverse metacenter is:
I. Metacentric height
II. KM

A. I
B. II
C. Either I or II
D. Neither I nor II

A

B. II

II. KM

44
Q

As a ship’s displacement changes such that its beam to draft ratio increases KM will:
I. Increase
II. Decrease

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I (Increase)

45
Q

Which of the following quantities does the ship’s officer calculate in doing a transverse stability problem to determine GM?
I. KG
II. KM

A. I
B. II
C. Either I or II
D. Neither I nor II

A

A. I (KG)

Stability (3 decks)

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