In snall angle stability, when external forces exist , the b

A vessel is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is ______.

A.positive

B.negative

C.zero

D.vertical

In small angle stability, when external forces exist, the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the ______.

A.center of gravity

B.center of flotation

C.metacenter

D.metacentric height

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

A vessel’s maximum stability is closely associated with which of the following?______. ① The angle of deck-edge immersion. ② The amount of freeboard.

A.① only

B.② only

C.Both ① and ②

D.Neither ① nor ②

With a given load on the cargo hook，tension in a single span topping lift ______.

A.increases as the boom's angle to the horizontal increases

B.is at a maximum when the boom is at a 45° angle to the horizontal

C.increases as the boom's angle to the horizontal decreases

D.decreases as the boom's angle to the horizontal decreases