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
How should you signal the crane operator to hoist（）.
The item（）is not the advantage of the hydraulic winch．
Most pedestal crane power is provided by（）.
When viewed from above，the best position for the guy in relation to the boom is（）.
Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
The net productivity per gang-hour can be improved through a decrease of（）.
When using slings，cargo handlers should take all the following precautions except（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.