A.Moving high weights lower
B.Adding weight at the tipping center
C.Moving a weight forward
D.Moving lower weight high
您可能感興趣的試卷
你可能感興趣的試題
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.executed
B.located
C.fixed
D.measured
A.the speed to be retarded by the friction brake
B.a load to go downward at full speed
C.the circuit breaker to turn off
D.the resistors to overheat and eventually burn out
A.Cranes are more difficult to secure for sea
B.The spotting area of the conventional gear is larger
C.A crane operator requires more training than the winch operator of a yard and stay rig
D.The yard and stay rig is more flexible in its ability to handle a wider variety of cargoes
A.At a 45° angle
B.At right angles
C.4 feet aft of the heel of the boom
D.Parallel to the boom
A.when the line pull reaches the rated winch capacity
B.after the line pull exceeds the rated winch capacity
C.after a short build-up of torque
D.immediately
A.Cargo whip
B.Gooseneck fitting
C.Spider band
D.Topping lift
A.Loading
B.Discharging
C.Crude oil washing
D.Steaming tanks
A.Electro-hydraulic units
B.Steam units
C.Independent internal combustion power units
D.All of the above
A.Cranes/derricks
B.Crane/derrick cycles
C.Crane/derrick cycle time
D.Weight per package
最新試題
When discharging an oil cargo，the first consideration is to（）.
On no account（）to be exceeded.
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
When using slings，cargo handlers should take all the following precautions except（）.
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（）.
Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
The net productivity per gang-hour can be improved through a decrease of（）.
Damage by（）shall not be considered as handling damage.
Official draft measurements should be（）by authorized persons，agreed by both parties involved.