A.Cranes are able to pick up and drop loads over a greater spotting area
B.Increased safety because the deck is clear of running and standing rigging
C.Simplicity of operation of the crane by its operator
D.All of the above
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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
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
最新試題
Which statement is FALSE concerning a tagline as used with a 30-ton pedestal crane（）.
What is the purpose of the equalizing beam aboard a crane vessel（）.
Running an electric winch at slow speed over a long period of time causes（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
Sudden starts or stops of the boom is likely to cause all of the following except（）.
Damage by（）shall not be considered as handling damage.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
Most pedestal crane power is provided by（）.
What is meant by the term“l(fā)uffing the boom”of a crane（）．
Which of the following statements is FALSE concerning cranes being installed on the centerline of vessels（）.