航海英语船舶货运基本知识章节练习(2018.02.13)

单项选择题
As a ship moves through the water，it causes a wake，which is also moving forward relative to the sea. In addition to a fore and aft motion，this wake also has a(n)（）.
A.downward and inward flow
B.downward and outward flow
C.upward and inward flow
D.upward and outward flow
单项选择题
The existence of liquids in partially full tanks or compartments of a ship causes a virtual rise in the height of the（）.
A.metacenter
B.center of buoyancy
C.center of flotation
D.center of gravity
单项选择题
A vessel aground may have negative GM since the（）.
A.decrease in KM is equal to the loss of draft
B.virtual rise of G is directly proportional to the remaining draft
C.lost buoyancy method is used to calculate KM，and KB is reduced
D.displacement lost acts at the point where the ship is aground
单项选择题
Pitching is angular motion of the vessel about what axis?（）.
A.Longitudinal
B.Transverse
C.Vertical
D.Centerline
单项选择题
The downflooding angle for a ship is the minimum angle at which（）.
A.the load line becomes submerged
B.a non-watertight opening is at still water level
C.offset becomes excessive
D.reserve buoyancy is a maximum
单项选择题
A vessel is listed when it is（）.
A.down by the head
B.down by the stern
C.inclined due to off-center weight
D.inclined due to wind
单项选择题
Horizontal fore or aft motion of a vessel is known as（）.
A.pitch
B.surge
C.sway
D.roll
单项选择题
At an angle of loll，the righting arm (GZ) is（）.
A.maximum
B.negative
C.positive，but reflexive
D.zero
单项选择题
For a vessel inclined by the wind，multiplying the buoyant force by the horizontal distance between the lines of action of the buoyant and gravity forces gives the（）.
A.righting moment
B.vertical moment
C.longitudinal moment
D.transverse moment
单项选择题
In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to（）.
A.heel until the angle of loll is reached
B.list until the center of buoyancy is aligned vertically with the center of gravity
C.trim to the side opposite TCG until all moments are equal
D.decrease draft at the center of flotation