C-11
A vessel would be referred to as "tender" when the weight of the cargo is __________.
Concentrated low and the double bottoms are full
Concentrated high and the double bottoms are empty
Evenly distributed vertically and the double bottoms are full
Concentrated low and the double bottoms are empty
GM is a measure of______.
The initial stability of the vessel
The amount of reserve bouyancy
Both A & B
Neither A nor B
What will happen when cargo is shifted from the main deck into the lower hold of a vessel?
The center of buoyancy will move upward
The metacenter will move upward
The GM will increase
All of the above
A negative metacentric height __________.
Will always cause a vessel to capsize
Always results from off‐center weights
Should always be immediately corrected
All of the above are correct
On a tanker vessel, what is the required combined capacity of the inert gas generating system as compared to the total capacity of all the cargo pumps which can be operated simultaneously?
1
1.25
0.75
0.5
Each inert gas system must be designed to supply the cargo tank with a gas, or mixture of gases, that has an oxygen content by volume of _____.
15% or less
20% or less
10% or less
5% or less
What is the required gas supply capacity of an inert gas system?
125% of cargo pump capacity
125% of forced draft rate
125% of shore side loading rate
125% of fan capacity
The difference between the initial trim of a vessel and the trim after anew load condition is known as ____________.
Angle of trim
Change of draft
Angle of list
Change of trim
Static water pressure of a hull of a ship is greatest at the _____.
Boot topping
Keel
Bow
Stern
When securing the operation of an inert gas system the final step should be _____.
Secure the salt water supply to the scrubber
Close the deck isolating valve
Secure the inert gas blower
Close the flue gas isolating valve
On a tanker vessel, what is the required combined capacity of the inert gas generating system as compared to the total capacity of all the cargo pumps which can be operated simultaneously?
0.5
1.25
0.75
1
Each inert gas system must be designed to supply the cargo tank with a gas, or mixture of gases, that has an oxygen content by volume of _____.
20% or less
5% or less
15% or less
10% or less
What is the required gas supply capacity of an inert gas system?
125% of shore side loading rate
125% of forced draft rate
125% of fan capacity
125% of cargo pump capacity
Each vessel designed to carry more than 49 passengers must have _____.
A minimum of four watertight bulkheads
At least one watertight bulkhead to prevent fire advancement for 2 hours
A continuous longitudinal watertight bulkhead
A collision bulkhead
Static water pressure of a hull of a ship is greatest at the _____.
Bow
Keel
Stern
Boot topping
When securing the operation of an inert gas system the final step should be _____.
Secure the salt water supply to the scrubber
Close the deck isolating valve
Close the flue gas isolating valve
Secure the inert gas blower
An inert gas system incorporating a separately fired inert gas generator shall be provided with visual and audible alarms to indicate failure of the power supply to the generator, the automatic control system and _____.
Combustion air temp too low high sea water temperature
High sea water temperature
Insufficient fuel supply
Cooling water flow
Which of the following methods is used to supply inert gas from a flue gas system to the cargo tanks?
Inert gas compressor
Exhaust gas pressure
High capacity fan
Natural aspiration
The component in an inert gas system use for cleaning the gas of solid and sulfur combustion products, while simultaneously cooling the inert gas, is called the _____.
Scrubber
Filter
Cooler
Purifier
If a vessel loses its reserve buoyancy, it will ________________.
Most likely sink
Remain unaffected if the hull remains intact
Capsize and float on its side
Float upright with the main deck awash
The purpose of the deck seal in an inner gas system is to prevent _____.
Air entering inert gas system
Inert gas escaping to atmosphere
Flue gas escaping to atmosphere
Flow reversal of tank vapors into the machinery space
A vessel which is subjected to hogging _____.
Has its main deck under compressive stress
Has its main deck plating under tensile stress
Has its bottom plate under tensile stress
Has its bottom plating under ductile stress
Excessive recirculation of inert gas is _____.
Likely to overheat the deck water seal
Likely to over pressurize the cargo tanks
Undesirable and it may lead to high oxygen content of the inert gas
Highly recommended
Which of the following methods of finished applications is/are considered to be satisfactory for resisting corrosion? I. Electroplating with cadmium II Sherardizing III. Galvanizing
I, II & III
I only
I & II
II & III
Where are self‐closing doors required on a vessel?
In the galley
To each sleeping room
In each stair tower
To the engine room
Yawing is the angular motion of the vessel about what axis?
Longitudinal
Vertical
Transverse
Centerline
Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system?
Drains off static electricity in the inert gas
Maintains the water seal on the gas main
Maintains the oxygen content at 5% by volume
Cools the inert gas
The purpose of swash bulkheads is to _____.
Separate cargoes in a common tank
Reduce liquid movement and surging within a tank
Minimize the effect of a listing condition
Restrict flooding within a tank
When a vessel is inclined, the tendency for it to return to its original position is caused by the _______________.
Upward movement of the center of floatation
Movement of the center of gravity
Movement of the center of buoyancy toward the low side of the vessel
Movement of the center of buoyancy toward the low side of the vessel
Penetrations and openings in watertight bulkheads in a vessel of less than 100 gross tons must _____.
Incorporate approved sluice valves
Be provided with non‐packed slip joints for expansion to permit passage of piping of electric cable
Only be placed in transverse watertight bulk heads that extend to the bulwark deck
Be kept as high and as far inboard as practicable
The result of a blow delivered by a heavy sea causing rapid vibrations of the elastic portions of the ships hull is identified as _____.
Pounding
Pitching
Hogging
Sagging
The double bottom in a vessel is a space comprised of _____.
Plating forming the engine room tank top
Doubler plating installed over the flat keel plate
Compartments between the inner and outer bottoms
A watertight boundary formed by the inner and outer bottoms
Which of the following describes the purpose of a striker or doubler plate?
Provides a surface for the application of force, or the installation of machinery
Prevents valve stem over travel
Absorbs machinery vibration
Provides landing surface of the sounding bob of a tank sounding tape
What standard mathematical formula is commonly used to calculate a vessels waterplane area for stability purposes?
Reynolds Number Rule
Simpson Rule
Standard Logarithmic Rule
Pythagorean Rule
Angular motion about the vertical axis of a vessel is known as _____________.
Surge
Hog
Yaw
Roll
The part of deck machinery that is known as the bitter end, is the _____________.
End of anchor chain fastened to the vessel
Looped end of the mooring cable
End of chain shackled to the anchor
Fixed end of the mooring cable fastened to mooring winch drum
A vessel's stability normally increases when tanks are ballasted because the vessel's______.
Center of buoyancy is lowered
Center of gravity is lowered
Reserve buoyancy is increased
Freeboard is increased
The volume of all watertight enclosed spaces above water line is called_________
Reserved bouyancy
Freeboard
Free surface
Marginal stability
Which statement is TRUE of a stiff vessel?
She will have an unusually high center of gravity
Her period of roll will be large due to her large metacentric height
She will have a large metacentric height
She will pitch heavily
Addition of weight to a vessel will ALWAYS __________.
Increase GM
Increase righting moments
All of the above
Reduce reserve buoyancy
In regards to the center of bouyancy, which of the following statement is correct?
It moves toward the high side of an inclines vessel
It moves toward the low side of an inclines vessel
It is the measure of metacentric height
It is located in the same position regardless of displacement
A continual change in the list, or trim of any floating MODU indicates______________ .
Progressive flooding
Negative 'GM'
Structural failure
An immediate need to counter flood
Where should you pay particular attention to be able to maintain adequate stability in loading deck cargo?
The cargo in the lower hold
The horizontal distribution of the deck cargo
The vertical distribution of the deck cargo
The horizontal distribution of the deck cargo
Which factor has the greatest effect on the value of the free surface correction?
The length of the tank
The width of the tank
The draft of the vessel
The specific gravity of the liquid in the tank
The tendency of a ship to resist a change in trim is call_______.
The righting arm couple
Metacentric height
Transverse inclination
Longitudinal stability
When making a turn (course change) on most merchant ships, the vessel will heel outwards if __________.
The vessel is deeply laden
G is below the center of lateral resistance
The vessel has very little draft
G is above the center of lateral resistance
An intact bouyancy means________.
The volume of all intact spaces above the waterline
An intact space when flooded will not cause the vessel to sink
An intact space below the flooded area
The space where all the vertical upward forces of buoyancy are considered to be concentrated
The difference between the initial trim of a vessel and the trim after anew load condition is known as ____________.
Change of trim
Angle of list
Angle of trim
Change of draft
An inert gas system is designed to reduce the possibility of tank explosion by _____.
Eliminating sparks and fire in the vicinity of cargo tanks
Reducing the oxygen concentration below levels necessary for combustion
Removing all hydrocarbon gases from the cargo tanks
Blanketing cargo tanks with inert foam
Which of the following conditions will result in an automatic shut down of the flue gas inert gas system?
Oxygen content of the gas falls below 5
High temperature gas entering the scrubber
Low temperature water leaving the scrubber seal
High temperature gas discharge from inert gas blowers
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