being raised too high
swinging at sea
overloading when not in use
being lowered too low
第1题：
The boom stops on a pedestal crane prevent the boom from ______.
A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low
第2题：
For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．
A.unchanged
B.increased
C.eliminated
D.decreased
第3题：
On a crane, the boom indicator tells the operator what angle the boom angle is compared to the ______.
A.vertical position
B.horizontal position
C.boom stop angle
D.minimum radius angle
第4题：
When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．
A.winch speed
B.boom strength
C.load radius
D.cable strength
第5题：
What does “evel-luffing” accomplish during crane operations ________．
A.It prevents the load from swinging when the boom level is adjusted
B.Less power is needed when topping the boom with a load on the hook
C.It maintains the height of the load above the deck
D.All of the above
第6题：
The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward．This is the signal to ______．
A.raise the boom
B.raise the hook
C.raise the boom and hook
D.check the boom stop
第7题：
The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the ______．
A.Maximum counter weight required
B.Minimum horsepower required
C.Hoist rope strength
D.Allowable load
第8题：
The boom stops are installed on an offshore crane to ______.
A.prevent the boom from being raised too high
B.prevent the boom from swinging
C.support the boom when not in use
D.prevent the boom from being lowered
第9题：
What is meant by the term“luffing the boom”of a crane ________．
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
第10题：
awkward cargo
drummed cargo
cased cargo
heavy cargo