航海英語(yǔ)甲板與船體保養(yǎng)單項(xiàng)選擇題每日一練(2019.01.07)

單項(xiàng)選擇題
Mechanical gearing of deck machinery such as the windlass or boat hoists should（）.
A.be open to view so，if a foreign object gets in the gearing，the operator can immediately stop the machinery
B.have a guard over the gearing
C.be painted a contrasting color from the base color in order to call attention to the gearing
D.not be operated if there is any crew within 10 feet of the machinery
單項(xiàng)選擇題
When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.
A.to their final position with the winch operating at slow speed
B.to the bar stop，and then hand cranked to their final position
C.until just before they make contact with the limit switch，and then hand cranked to their final position
D.to the embarkation deck，and then hand cranked to their final position
單項(xiàng)選擇題
The holding power of an anchor increases when the（）.
A.amount of chain lying along the bottom increases
B.length of the catenary is reduced
C.mooring line tension is increased
D.amount of chain lying along the bottom decreases
單項(xiàng)選擇題
Which tackle arrangement has the LEAST mechanical advantage（）.
A.Single whip
B.Gun tackle
C.Luff tackle
D.Twofold purchase
單項(xiàng)選擇題
What danger is presented if a waterspout passes over a ship?（）
A.Heavy rains could cause downflooding
B.Visibility could be restricted by low clouds
C.Large waves could cause structural damage
D.Personnel may be injured by loose deck gear blown by the wind