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
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.
When instructing a crew member concerning the right way to lift a weight，you would instruct him to（）.
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（）.
Damage by（）shall not be considered as handling damage.
When discharging oil from an oil tanker the instantaneous rate（）60 liters per nautical mile.
The item（）is not the advantage of the hydraulic winch．
How should you signal the crane operator to move slowly（）.