第1题
Which statement(s) is/are TRUE concerning crane cargo operations?
A.Do not exceed rated load capacity of crane and container spreader or slings
B.During any cargo handling operation,the safety of personnel is paramount
C.Cargo handlers must be outfitted with adequate protection from personal injury
D.All the above
第2题
Cargo handling unit is rated according to the _____ to be lifted.
A.cargo crane
B.jib
C.safe working load
D.oil pressure
第3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4题
For any given pedestal crane,when the boom is lengthened,the lifting capacity is ______.
A.unchanged
B.increased
C.eliminated
D.decreased
第5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6题
The boom indicator on a crane will indicate the ______.
A.Length of the boom
B.Angle of the boom
C.Lifting capacity of the boom
D.Direction of the boom
第7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8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9题
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
第10题
With a given load on the cargo hook,the thrust on a cargo boom ______.
A.increases as the angle to the horizontal increases
B.increases as the angle to the horizontal decreases
C.is greatest at an angle of 45° and decreases as the boom is raised or lowered
D.is least at an angle of 45° and increases as the boom is raised or lowered
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