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Stability > EXAM 2 > Flashcards

EXAM 2 Flashcards

1
Q

What can cause a vessel to list?
I. An off the center position of G
II. A negative GM, such that G is above M.

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

A

C. Either I or II

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2
Q

Which would have more of an effect in the reduction of GM, considering both have the same dimensions?
I. A tank flooded near the upper deck
II. A tank flooded in the double bottoms

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

A

A. I

A tank flooded near the upper deck

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3
Q

If tanks are filled with a liquid and they lie either partly or wholly above the waterline, the cross-connection valve should be:

A. Open
B. Closed
C. Makes no difference

A

A. Open

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4
Q

Considering the cross curves of stability, the assumed KG is:

A. Selected to show positive righting arms up to 90 degs
B. Selected to be less than ever normally encountered
C. Selected so that correcting the assumed KG to the actual KG can always be done in the same manner
D. All of the above

A

D. All of the above

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5
Q

Cross curves of stability are:
I. Constructed from statical stability curves.
II. Calculated for static conditions

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

A

B. II

Calculated for static conditions

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6
Q

Concerning free surface, which of the following far outweighs all others in its importance in determining free surface effects?

A. The length of the tank
B. The width of the tank
C. The location of the tank
D. The ratio of specific gravity of the material in the tank to the specific gravity of the water the vessel is floating in

A

B. The width of the tank

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7
Q

(TRUE/FALSE) The light KG for sister ships can be assumed to be the same.

A

False

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8
Q

To insure the vessel is floating free the following precautions should be made:
I. Soundings should be taken around the vessel so that it is not resting on the bottom.
II. Mooring lines should be slacked off

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

A

C. Either I or II

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9
Q

You need to correct a stability curve for a vertical position of G above the assumed position; which of the following methods would you use?
I. Reduce the righting arms by the value of GG’ sin (-)
II. Increase the righting arms by the value of GG’ cos (-)

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

A

A. I

Reduce the righting arms by the value of GG’ sin (-)

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10
Q

By constructing a statical stability curve which of the following can be obtained from the curve?

A. Displacement
B. Angle of inclination that maximum righting arm occurs
C. KG
D. All of the above

A

B. Angle of inclination that maximum righting arm occurs

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11
Q

The purpose of the inclining experiment is to determine:
A. KM
B. The moment of inertia of the water plane area
C. KG
D. KB

A

C. KG

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12
Q

Which of the following factors does not effect free surface?

A. Width of the compartment
B. Length of the compartment
C. Amount of liquid in the compartment
D. The displacement of the ship

A

C. Amount of liquid in the compartment

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13
Q

If the tanks are empty, the cross-connection valve should be:

A. Open
B. Closed
C. Makes no difference

A

A. Open

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14
Q

A tank or compartment aboard your ship is located below the vessel’s waterline. If the space in question is flooded completely, you would expect the value of the free surface effect for that space to:

A. Increase
B. Decrease
C. Vanish completely
D. Cannot be determined

A

C. Vanish completely

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15
Q

What is the actual range of stability for a vessel at sea?
I. The angle of maximum list is approximately at deck edge immersion.
II. The angle of maximum roll is approximately at the vanishing point, where GZ equals zero.

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

A

D. Neither I nor II

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16
Q

What following two points determine the value of the maximum righting arm as well as values of GZ at all angles of heel?

A. G and M
B. K and G
C. B and M
D. G and B

A

D. G and B

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17
Q

Statical stability curves:
I. Show righting arms at various angles of inclination for a specific KG and displacement
II. May be used by a vessel at sea

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

A

C. Either I nor II

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18
Q

How does GM relate to the statical stability curve?
I. GM only influences stability at small angles of inclination
II. If GM increases, then righting arms at all inclinations increase

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

A

C. Either I or II

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19
Q

Deflection is measured:
I. On the pendulum
II. On the batten

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

A

B. II

On the betten

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20
Q

If the tanks are partially or fully loaded with dry cargo, the cross-connection valve should be:

A. Open
B. Closed
C. Makes no difference

A

A. Open

21
Q

Your vessel is listing. The cause of the list is unknown. the action you would take to correct the list would be to:
I. Shift weight from the low side to the high side
II. Shift weight from a higher to a lower position in the vessel

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

A

B. II

22
Q

To calculate the GM of the vessel from her rolling period, you should:
A. Average 5 full rolling periods in the morning
B. Avg 10 full rolling periods in the afternoon
C. Avg 15 full rolling periods in the evening
D. Avg as many full rolling periods of the vessel as possible and also take the times at several different periods of the day

A

D. D. Avg as many full rolling periods of the vessel as possible and also take the times at several different periods of the day

23
Q

What effect does flooding a compartment have on the effective water plane of a vessel?
I. The moment of inertia of the water plane is reduced.
II. The total effective water plane area is reduced.

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

A

C. Either I or II

24
Q

A beam wind will cause the results of an inclining experiment to be:
I. In error with a KG that is too large
II. In error with a KG that is too small

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

A

C. Either I or II

25
Q

You could expect free surface effects to _______ as the vessel inclination is increased due to pocketing.

A. Increase
B. Decrease
C. Remain the same
D. Cannot be determined

A

B. Decrease

26
Q

Your ship has commenced to experience syncronous rolling. To correct this situation assuming you are underway, you could:

A. Change course
B. Change speed
C. Change the GM of the vessel
D. All of the above

A

D. All of the above

27
Q

When considering the angle of deck edge immersion you would expect the values of GZ to:

A. Continue to grow larger as deck edge immersion is past
B. Remain fairly constant as deck edge immersion is past
C. Commence to decrease as deck edge immersion is past
D. Cannot be determined

A

D. Cannot be determined

28
Q

Consider a cargo tank aboard the vessel you are sailing on. The tank is slack. If gasoline were pumped out and an equal amount of sea water was pumped into the tank you would epect the value of the free surface effect to:

A. Increase
B. Decrease
C. Remain the same
D. Cannot be determined

A

A. Increase

29
Q 
Of the following three types of vessels, which would you expect to normally have the shortest roll period?
A. Freighter (dry cargo)
B. Tanker
C. Passenger ship
D. Cannot be determined
A

B. Tanker

30
Q

To approximate the initial slope of the statical stability curve you would:

A. Graphically construct at 57.3 degs of inclination a height equal to GM, and from that point to the origin of the curve draw a line that approximates the first 10 degs of the curve.
B. Use the formula GZ = GM sine (-)
C. Use the wall-sided formula
D. All of the above

A

D. All of the above

31
Q 
Stability calculations should be made:
A. Prior to the stowage plan being made
B. While the stowage plan is being made
C. After the stowage plan has been made
D. After all cargo has been loaded on board
A

B. While the stowage plan is being made

32
Q

Dynamical stability is:
I. Indicated by the area under the statical stability curve.
II. Represents the amount of energy expended to incline a vessel

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

A

C. Either I or II

33
Q 
Which of the following types of rolling is dangerous?
A. Natural rolling
B. Forced rolling
C. Synchronous rolling
D. All of the above
A

C. Synchronous rolling

34
Q

If your vessel is listing due to an off-center weight, you could adjust your statical stability curve by use of:
I. GG’ sin (-)
II. GG’ cos (-)

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

A

B. II

GG’ cos (-)

35
Q

Which of the precautions below should be observed when performing an inclining experiement?
I. The vessel should not have a list prior to the commencement of the experiment.
II. The experiment should be performed on a calm day at sea.

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

A

A. I

I. The vessel should not have a list prior to the commencement of the experiment.

36
Q

What sets forth the master’s responsibility for maintaining satisfactory stability conditions at all times?
I. The stability booklet approved by the US Coast Guard
II. The stability letter issued by the USCG

A

C. Either I or II

37
Q

Which of the following will result in a loss of righting arm at large angles of inclination?
I. Tumble-home
II. Flare

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

A

A. I (Tumble-home)

38
Q

The statical range of stability is:
I. When the statical stability curve crosses the base line.
II. When the value of the righting arm is equal to zero.

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

A

C. Either I and II

39
Q

If a vessel has a negative GM you would expect it to:

A. Be able to list to either side
B. Be able to list to one side only
C. Capsize
D. None of the above

A

A. Be able to list to either side

40
Q

If the tanks are filled with liquid and they lie below the waterline, the cross-connection valve should be:

A. Open
B. Closed
C. Makes no difference

A

C. Makes no difference

41
Q

Freeboard has:
I. No effect on initial stability
II. A definite effect on stability at large angles of inclination

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

A

C. Either I or II

42
Q

In adjusting the results of the inclining experiment for the inclining weight, which method would you use?
I. The inclining experiment formula
II. The principle of moments

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

A

B. II

The principle of moments

43
Q

Cross curves of stability:
I. Must be constructed for the ship by the ship designer
II. Can be used by the ship’s officer to construct a statical stability curve for the particular condition which his ship possesses.

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

A

C. Either I or II

44
Q

If the tanks are carrying liquid with a free surface, the cross-connection valve should be:

A. Open
B. Closed
C. Makes no difference

A

B. Closed

45
Q

If a vessel has a negative GM and weight is added to the high side to attempt to correct the list, what would you expect to happen:
I. The angle of list could decrease.
II. The angle of list could increase

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

A

B. II

The angle of list could increase

46
Q

The inclining weight should be allowed to move along:
I. The camber of the deck.
II. The deck so that the movement of G can be represented a right triangle

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

A

B. II

The deck so that the movement of G can be represented a right triangle

47
Q

The pendulum in an inclining experiment can:
I. Be located off the vessel’s centerline
II. Be replaced by using the vessel’s inclinometer

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

A

A. I

Be located off the vessel’s centerline

48
Q

The most cost-effective way to limit free surface when building a ship would be to increase the number of:
I. Transverse bulkheads
II. Longitudinal bulkheads

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

A

B. II

Longitudinal bulkheads

Stability (3 decks)

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