Naval Architecture - MEO CLASS 4 WRITTEN PAPER - Page 8 of 11

SECTION – 3

TAKEN FROM NET

Stability is determined principally by the relationship of the center of gravity and the
1. aft perpendicular
2. center of buoyancy
3. keel
4. center of flotation

ANS.: B

At all angles of inclination, the true measure of a vessel’s stability is the
1. metacentric height
2. displacement
3. righting moment
4. inclining moment

ANS.: C

The weight of the liquid displaced by a vessel floating in sea water is equal to the
1. weight required to sink the vessel
2. total weight of the vessel
3. displaced submerged volume
4. reserve buoyancy

ANS.: B

When the height of the metacenter is less then the height of the center of gravity, a vessel has what type of stability?
1. stable
2. neutral
3. unstable
4. positive

ANS.: C

Flooding of any compartment in a ship, resulting in a serious loss of reserve buoyancy, will always
1. increase ship stability
2. reduce ship stability
3. cause a serious permanent list
4. decrease the heeling moment

ANS.: B

The stability of a vessel is normally the greatest when all fuel and water tanks are full because the
1. center of gravity is lowered
2. center of buoyancy is lowered
3. reserve buoyancy is unchanged
4. hull freeboard is increased

ANS.: A

A vessel’s center of gravity is lowered when the
1. freeboard is increased
2. tanks are ballasted
3. reserve buoyancy increase
4. trim is increased

ANS.: B

In the event of a collision, watertight integrity may be lost if
1. the sounding tube cap from a damaged tank is missing
2. the dogs on a manhole cover are secure
3. you have recently replaced a gasket in a watertight door
4. you operate the dewatering system from a flooded compartment

ANS.: A

When the height of metacenter is greater than the height of the center of gravity, a vessel has what type of stability?
1. positive
2. neutral
3. unstable
4. negative

ANS.: A

What is the usual effect of moving weight from low in the vessel to above the main deck?
1. the stability is increased
2. the draft is increased
3. the stability is decreased
4. the reserve buoyancy is decreased

ANS.: C

If the result of loading a ship is an increase in the height of gravity, there will always be an increase in the
1. metacentric height
2. righting arm
3. righting moment
4. vertical moments

ANS.: D

If a vessel looses its reserve buoyancy, it will
1. float upright with the main deck awash
2. capsize and float on its side
3. remain unaffected if the hull remains intact
4. most likely sink

ANS.: D

The purpose of the inclining experiment on a ship is to determine
1. lightweight and lightweight center of gravity location
2. the position of the center of buoyancy
3. the position of the metacenter
4. the maximum load line

ANS.: A

The reserve buoyancy of a vessel varies directly with changes in the vessel’s
1. free surface
2. freeboard
3. rolling period
4. none of the above

ANS.: B

The reserve buoyancy of a ship consists of
1. the void portion of the ship below the waterline which is enclosed and watertight
2. all cofferdams, double bottoms, and wing tanks that are slack
3. the part of the enclosed and watertight portion of a vessel above thewaterline
4. the percentage of the volume of a compartment which can be occupied by water if flooded

ANS.: C

Reducing the free surfaces within a vessel, reduces the
1. natural roll period
2. metacentric height
3. waterplane area
4. uncorrected height of the center of gravity

ANS.: A

The free surface effects of a partially filled liquid tank decrease with increased
1. density of the liquid
2. placement of the tank above the keel
3. displacement volume of the ship
4. size of the surface area in the tank

ANS.: C

18. The distance between the bottom of the hull and the waterline is called

tonnage
reserve buoyancy
draft
freeboard

ANS.: C

After transferring a weight forward on a vessel, the draft at the center of flotation will
1. change, depending on the location of the center of gravity
2. increase
3. decrease
4. remain the constant

ANS.: D

Fuel oil tank vents are fitted with corrosion resistant screens to prevent
1. flames entering through the tank vent
2. escape of flammable vapors
3. corrosion in the tank vent
4. damage to the ball check

ANS.: A

Reserve buoyancy is the
1. unoccupied space below the waterline
2. volume of intact space above the waterline
3. excess of the buoyant force over gravitational force
4. difference between buoyancy in salt and fresh water

ANS.: B

With no environmental forces present, the center of gravity of an inclined vessel is vertically aligned with the
1. longitudinal centerline
2. center of flotation
3. original vertical centerline
4. center of buoyancy

ANS.: C

The addition of weight at the longitudinal center of flotation will
1. increase the forward draft and decrease the after draft
2. decrease the forward draft and increase the after draft
3. have no effect on the trim
4. have no effect on the stability

ANS.: C

In ship construction, beams are transverse girders which provide support to
1. bulkheads
2. deckhouse structures
3. decks
4. vertical frames

ANS.: C

In ship construction, beam brackets are triangular plates joining the deck beam to a
1. bulkhead
2. frame
3. stanchion
4. deck longitudinal

ANS.: B

Stanchions prevent the entire deck load on a ship from being carried by the
1. bulkheads
2. stringers
3. frames and beam brackets
4. deck longitudinals

ANS.: C

Support of ship side plating is provided primarily by transverse
1. beams
2. girders
3. frames
4. bulkheads

ANS.: C

Lighter longitudinal stiffening frames on the ship side plating are called
1. stringers
2. side frames
3. side stiffeners
4. intercostals

ANS.: A

The heavier outboard strake of deck plating on a ship is called the deck
1. stiffener
2. beam
3. stringer
4. doubler

ANS.: C

Where is thicker plating usually found in the construction of integral tanks on a ship?
1. on the outside of the tank
2. at the bottom of the tank
3. at the top of the tank
4. at the center of the tank