A.It allows for rotation of the hook in the single mode
B.It is required to“twin-up”30-ton pedestal cranes
C.It is used to pick up light loads
D.It is used to rigidly connect two cranes
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A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
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
A.started
B.finished
C.completed
D.reported
A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package
A.Date and description of each failure
B.Average load in pounds for each usage
C.Total number of lifts for each usage
D.All of the above
最新試題
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
Sudden starts or stops of the boom is likely to cause all of the following except（）.
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
What does “evel-luffing” accomplish during crane operations（）.
How should you signal the crane operator to lower the boom and raise the load（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
Which statement is FALSE concerning a tagline as used with a 30-ton pedestal crane（）.
Damage by（）shall not be considered as handling damage.
When discharging an oil cargo，the first consideration is to（）.