A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
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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
A.less jerky starts
B.less jerky stops
C.overheating worries
D.none of the overheating worries
最新試題
When viewed from above，the best position for the guy in relation to the boom is（）.
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（）.
When discharging an oil cargo，the first consideration is to（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
How should you signal the crane operator to lower the boom and raise the load（）.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.
Which of the following statement（s）is/are FALSE regarding a twin pedestal crane set （）.
Which statement comparing a shipboard crane to conventional gear is TRUE（）.