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单选题

For an upright vessel，draft is the vertical distance between the keel and the（）.

A. waterline
B. freeboard deck
C. plimsoll mark
D. amidships sectio

单选题

If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will（）.

A. increase the righting moment
B. increase the righting arm
C. increase list or trim
D. decrease list or trim

单选题

It’ll affect neither the draft（）the rotation of discharging.

A. or
B. and
C. nor
D. either

单选题

Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.

A. ballast
B. reserve buoyancy
C. displacement
D. rolling period

单选题

My drafts are 28 feet（）and 29 feet aft.

A. fore
B. advance
C. before
D. beforehand

单选题

Owing to the big draft，the ship is not permitted to go alongside until the time of（）.

A. ebb tide
B. flood tide
C. spring tide
D. slack water

单选题

Reducing the liquid free surfaces in a vessel reduces the（）.

A. roll period
B. metacentric height
C. waterplane area
D. vessel's draft

单选题

Reserve buoyancy is（）.

A. also called GM
B. the void portion of the ship below the waterline which is enclosed and watertight
C. affected by the number of transverse watertight bulkheads
D. the watertight portion of a vessel above the waterline

单选题

The average of the forward and after drafts is the（）.

A. mean draft
B. true mean draft
C. mean of the calculated drafts
D. draft at the center of flotatio

单选题

The center of volume of the immersed portion of the hull is called the（）.

A. center of buoyancy
B. center of flotation
C. center of gravity
D. tipping center

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