航海英语锚泊与靠离泊作业章节练习(2018.08.05)

单项选择题
You are proceeding down a channel and lose the engine（s）.You must use the anchors to stop the ship.Which statement is true（）.
A.Pay out all of the cable before setting up on the brake to insure the anchors dig in and hold
B.For a mud，mud and clay，or sandy bottom pay out a scope of 5 to 7 times the depth before setting up on the brake
C.Use one or both anchors with a scope of twice the depth before setting the brake
D.Drop the anchor to short stay and hold that scope
单项选择题
It is sometimes necessary to moor bow and stern to two mooring buoys in order to（）.
A.avoid any swing in a restricted space
B.shelter the ship from strong winds
C.prevent from touching with other vessels
D.make a convenience of cargo discharging
单项选择题
What type of stopper would you use on a nylon mooring line? （）
A.Chain
B.Nylon
C.Manila
D.Wire
单项选择题
Mariners should ensure correct（）of aids to navigation during twilight periods when some lighted aids to navigation are lit while others are not.
A.identification
B.distinction
C.discrimination
D.clearly seeing
单项选择题
The holding capabilities of an anchor are determined PRIMARILY by the（）.
A.design of the anchor
B.weight of the anchor
C.scope of the anchor chain
D.size of the vessel
单项选择题
The most doubtful and unpredictable factor in a mooring system is the（）.
A.ability of the anchors to hold in a seabed
B.anchor chain catenary length
C.variability of the fairlead
D.angle of the flukes
单项选择题
A Danforth lightweight anchor does NOT hold well in which type of bottom? （）
A.Mud
B.Grass
C.Sand
D.Clay
单项选择题
Which safety check（s）should be made before letting go the anchor（）.
A.See that the anchor is clear of obstructions
B.See that the chain is all clear
C.See that the wildcat is disengaged
D.All of the above
单项选择题
Vessels lying afloat at buoys for more than 24 hours should use anchor chain for（）and insurance wire for（）.
A.bow mooring／stern line
B.forward spring／after spring
C.forward breast rope／forward spring
D.slip rope／stern line
单项选择题
Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.
A.obscured
B.darkened
C.greyed
D.delighted