海船船员考试
单选题What is meant by the term“luffing the boom”of a crane（）．A Stopping the boomB Topping or lowering the boomC Moving the boom left or rightD All of the above
题目
Stopping the boom
Topping or lowering the boom
Moving the boom left or right
All of the above
参考答案和解析
相似问题和答案
第1题：
In a ordinary cargo crane, ______is fitted to rotate the crane.
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.the fan motor
第2题：
The boom stops on a pedestal crane prevent the boom from ______.
A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low
第3题：
2 The activities of an organisation have to be managed and co-ordinated to ensure that its objectives are met. The organisation’s structure is designed to support this.
Required:
(a) What is meant by the term ‘organisational structure,’ often shown as an organisation chart? (5 marks)
2 All organisations of whatever size have to work in a co-ordinated way to ensure that the objectives laid down are achieved.However, for effective co-ordination to take place, the structure must be correct and understood. Very often, managers know the structure but cannot explain its significance or appropriateness.
(a) The structure of an organisation is often depicted as a chart. The structure explains the communication pattern, the linking mechanism between departments, tasks and individuals, the co-ordinating mechanism that ensures the entire organization is working toward the same objective, and who is in control of the organisation’s activities and at what level in the organisation.
第4题：
What does “evel-luffing” accomplish during crane operations ________．
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
第5题：
For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．
A.unchanged
B.increased
C.eliminated
D.decreased
第6题：
The boom stops are installed on an offshore crane to ______.
A.prevent the boom from being raised too high
B.prevent the boom from swinging
C.support the boom when not in use
D.prevent the boom from being lowered
第7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8题：
On a crane, the boom indicator tells the operator what angle the boom angle is compared to the ______.
A.vertical position
B.horizontal position
C.boom stop angle
D.minimum radius angle
在船上，吊杆指示器指示一个吊杆与什么比较的角度？水平线位置
第9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10题：
What is meant by the term“luffing the boom”of a crane ________．
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above