a hoisting motor
a luffing motor
a mooring motor
a slewing motor
第1题：
Which statement is FALSE regarding the operation of a crane ________．
A.The crane jib is raised and lowered by the luffing winch
B.The cargo block is raised and lowered by the hoisting winch
C.The cargo block is raised and lowered by the luffing winch
D.None of the above
第2题：
For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．
A.unchanged
B.increased
C.eliminated
D.decreased
第3题：
What cargo does a jumbo boom or heavy derrick used for lifting?
第4题：
The （）(浮吊) can float on water used to load and unload the cargo.
第5题：
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
第6题：
Which safety precaution（s）should be observed during crane operations ________．
A.Checking for proper lifting from beneath the load during cargo operations
B.Using the proper slings or other lifting devices during cargo operations
C.Relaying communications to port agents on the pier during cargo hoists
D.All of the above
第7题：
The boom indicator on a crane will indicate the ______．
A.Length of the boom
B.Angle of the boom
C.Lifting capacity of the boom
D.Direction of the boom
第8题：
Which statement(s) is/are TRUE concerning crane cargo operations?
A.Do not exceed rated load capacity of crane and container spreader or slings
B.During any cargo handling operation，the safety of personnel is paramount
C.Cargo handlers must be outfitted with adequate protection from personal injury
D.All the above
第9题：
When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．
A.winch speed
B.boom strength
C.load radius
D.cable strength
第10题：
A （）can give power to hoist or lower cargo.