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
They（）loading at 1400 hours．
The item（）is not the advantage of the hydraulic winch．
Pedestal cranes have limit switches to restrict movement of which function（s）（）.
When discharging an oil cargo，the first consideration is to（）.
How should you signal the crane operator to move slowly（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
Which of the following statement（s）is/are FALSE regarding a twin pedestal crane set （）.
The net productivity per gang-hour can be improved through a decrease of（）.
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
Sudden starts or stops of the boom is likely to cause all of the following except（）.