單項選擇題What is/are the advantage（s）of cranes over conventional cargo booms（）.

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


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題What is the purpose of the equalizing beam aboard a crane vessel（）.

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

2.單項選擇題What is meant by the term“l(fā)uffing 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

3.單項選擇題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

4.單項選擇題They（）loading at 1400 hours．

A.started
B.finished
C.completed
D.reported

5.單項選擇題The net productivity per gang-hour can be improved through a decrease of（）.

A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package